Threads.cpp revision 32397c1cd3327905173b36baa6fd1c579bc328ff
1edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project/* 2edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * Copyright (C) 2007 The Android Open Source Project 3edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * 4edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * Licensed under the Apache License, Version 2.0 (the "License"); 5edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * you may not use this file except in compliance with the License. 6edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * You may obtain a copy of the License at 7edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * 8edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * http://www.apache.org/licenses/LICENSE-2.0 9edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * 10edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * Unless required by applicable law or agreed to in writing, software 11edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * distributed under the License is distributed on an "AS IS" BASIS, 12edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * See the License for the specific language governing permissions and 14edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * limitations under the License. 15edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project */ 16edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 179adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project// #define LOG_NDEBUG 0 18edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#define LOG_TAG "libutils.threads" 19edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 20edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#include <utils/threads.h> 21edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#include <utils/Log.h> 22edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 238c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn#include <cutils/sched_policy.h> 247b0d45c3465304ccdd29ad20f43270ffd5a6aec0Dianne Hackborn#include <cutils/properties.h> 258c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn 26edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#include <stdio.h> 27edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#include <stdlib.h> 28edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#include <memory.h> 29edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#include <errno.h> 30edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#include <assert.h> 31edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#include <unistd.h> 32edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 33edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#if defined(HAVE_PTHREADS) 34edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project# include <pthread.h> 35edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project# include <sched.h> 36edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project# include <sys/resource.h> 37edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#elif defined(HAVE_WIN32_THREADS) 38edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project# include <windows.h> 39edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project# include <stdint.h> 40edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project# include <process.h> 41edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project# define HAVE_CREATETHREAD // Cygwin, vs. HAVE__BEGINTHREADEX for MinGW 42edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#endif 43edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 44edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#if defined(HAVE_PRCTL) 45edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#include <sys/prctl.h> 46edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#endif 47edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 48edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project/* 49edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * =========================================================================== 50edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * Thread wrappers 51edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * =========================================================================== 52edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project */ 53edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 54edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectusing namespace android; 55edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 56edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project// ---------------------------------------------------------------------------- 57edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#if defined(HAVE_PTHREADS) 58edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project// ---------------------------------------------------------------------------- 59edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 60edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project/* 617b0d45c3465304ccdd29ad20f43270ffd5a6aec0Dianne Hackborn * Create and run a new thread. 62edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * 63edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * We create it "detached", so it cleans up after itself. 64edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project */ 65edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 66edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projecttypedef void* (*android_pthread_entry)(void*); 67edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 689c82c48d52edb722cc3991ef3c0ad5f07aa12feaDianne Hackbornstatic pthread_once_t gDoSchedulingGroupOnce = PTHREAD_ONCE_INIT; 699c82c48d52edb722cc3991ef3c0ad5f07aa12feaDianne Hackbornstatic bool gDoSchedulingGroup = true; 709c82c48d52edb722cc3991ef3c0ad5f07aa12feaDianne Hackborn 719c82c48d52edb722cc3991ef3c0ad5f07aa12feaDianne Hackbornstatic void checkDoSchedulingGroup(void) { 729c82c48d52edb722cc3991ef3c0ad5f07aa12feaDianne Hackborn char buf[PROPERTY_VALUE_MAX]; 739c82c48d52edb722cc3991ef3c0ad5f07aa12feaDianne Hackborn int len = property_get("debug.sys.noschedgroups", buf, ""); 749c82c48d52edb722cc3991ef3c0ad5f07aa12feaDianne Hackborn if (len > 0) { 759c82c48d52edb722cc3991ef3c0ad5f07aa12feaDianne Hackborn int temp; 769c82c48d52edb722cc3991ef3c0ad5f07aa12feaDianne Hackborn if (sscanf(buf, "%d", &temp) == 1) { 779c82c48d52edb722cc3991ef3c0ad5f07aa12feaDianne Hackborn gDoSchedulingGroup = temp == 0; 789c82c48d52edb722cc3991ef3c0ad5f07aa12feaDianne Hackborn } 799c82c48d52edb722cc3991ef3c0ad5f07aa12feaDianne Hackborn } 809c82c48d52edb722cc3991ef3c0ad5f07aa12feaDianne Hackborn} 819c82c48d52edb722cc3991ef3c0ad5f07aa12feaDianne Hackborn 82edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectstruct thread_data_t { 83edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project thread_func_t entryFunction; 84edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project void* userData; 85edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project int priority; 86edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project char * threadName; 87edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 88edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // we use this trampoline when we need to set the priority with 89edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // nice/setpriority. 90edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project static int trampoline(const thread_data_t* t) { 91edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project thread_func_t f = t->entryFunction; 92edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project void* u = t->userData; 93edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project int prio = t->priority; 94edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project char * name = t->threadName; 95edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project delete t; 96edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project setpriority(PRIO_PROCESS, 0, prio); 979c82c48d52edb722cc3991ef3c0ad5f07aa12feaDianne Hackborn pthread_once(&gDoSchedulingGroupOnce, checkDoSchedulingGroup); 989c82c48d52edb722cc3991ef3c0ad5f07aa12feaDianne Hackborn if (gDoSchedulingGroup) { 999c82c48d52edb722cc3991ef3c0ad5f07aa12feaDianne Hackborn if (prio >= ANDROID_PRIORITY_BACKGROUND) { 1009c82c48d52edb722cc3991ef3c0ad5f07aa12feaDianne Hackborn set_sched_policy(androidGetTid(), SP_BACKGROUND); 1019c82c48d52edb722cc3991ef3c0ad5f07aa12feaDianne Hackborn } else { 1029c82c48d52edb722cc3991ef3c0ad5f07aa12feaDianne Hackborn set_sched_policy(androidGetTid(), SP_FOREGROUND); 1039c82c48d52edb722cc3991ef3c0ad5f07aa12feaDianne Hackborn } 1049c82c48d52edb722cc3991ef3c0ad5f07aa12feaDianne Hackborn } 1059c82c48d52edb722cc3991ef3c0ad5f07aa12feaDianne Hackborn 106edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (name) { 107edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#if defined(HAVE_PRCTL) 108edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Mac OS doesn't have this, and we build libutil for the host too 109edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project int hasAt = 0; 110edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project int hasDot = 0; 111edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project char *s = name; 112edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project while (*s) { 113edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (*s == '.') hasDot = 1; 114edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project else if (*s == '@') hasAt = 1; 115edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project s++; 116edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 117edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project int len = s - name; 118edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (len < 15 || hasAt || !hasDot) { 119edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project s = name; 120edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } else { 121edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project s = name + len - 15; 122edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 123edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project prctl(PR_SET_NAME, (unsigned long) s, 0, 0, 0); 124edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#endif 125edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project free(name); 126edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 127edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return f(u); 128edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 129edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project}; 130edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 131edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectint androidCreateRawThreadEtc(android_thread_func_t entryFunction, 132edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project void *userData, 133edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project const char* threadName, 134edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project int32_t threadPriority, 135edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project size_t threadStackSize, 136edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project android_thread_id_t *threadId) 137edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 138edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project pthread_attr_t attr; 139edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project pthread_attr_init(&attr); 140edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); 141edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 142edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#ifdef HAVE_ANDROID_OS /* valgrind is rejecting RT-priority create reqs */ 143edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (threadPriority != PRIORITY_DEFAULT || threadName != NULL) { 144edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // We could avoid the trampoline if there was a way to get to the 145edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // android_thread_id_t (pid) from pthread_t 146edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project thread_data_t* t = new thread_data_t; 147edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project t->priority = threadPriority; 148edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project t->threadName = threadName ? strdup(threadName) : NULL; 149edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project t->entryFunction = entryFunction; 150edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project t->userData = userData; 151edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project entryFunction = (android_thread_func_t)&thread_data_t::trampoline; 152edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project userData = t; 153edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 154edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#endif 155edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 156edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (threadStackSize) { 157edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project pthread_attr_setstacksize(&attr, threadStackSize); 158edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 159edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 160edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project errno = 0; 161edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project pthread_t thread; 162edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project int result = pthread_create(&thread, &attr, 163edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project (android_pthread_entry)entryFunction, userData); 1643919950de8b54d4781c09e711fd2afabab452e69Le-Chun Wu pthread_attr_destroy(&attr); 165edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (result != 0) { 166edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project LOGE("androidCreateRawThreadEtc failed (entry=%p, res=%d, errno=%d)\n" 167edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project "(android threadPriority=%d)", 168edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project entryFunction, result, errno, threadPriority); 169edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return 0; 170edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 171edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 172d9e1bb76fe1e01fb79bb65959b92051aa18fddbeGlenn Kasten // Note that *threadID is directly available to the parent only, as it is 173d9e1bb76fe1e01fb79bb65959b92051aa18fddbeGlenn Kasten // assigned after the child starts. Use memory barrier / lock if the child 174d9e1bb76fe1e01fb79bb65959b92051aa18fddbeGlenn Kasten // or other threads also need access. 175edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (threadId != NULL) { 176edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project *threadId = (android_thread_id_t)thread; // XXX: this is not portable 177edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 178edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return 1; 179edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 180edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 181edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectandroid_thread_id_t androidGetThreadId() 182edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 183edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return (android_thread_id_t)pthread_self(); 184edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 185edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 186edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project// ---------------------------------------------------------------------------- 187edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#elif defined(HAVE_WIN32_THREADS) 188edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project// ---------------------------------------------------------------------------- 189edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 190edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project/* 191edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * Trampoline to make us __stdcall-compliant. 192edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * 193edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * We're expected to delete "vDetails" when we're done. 194edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project */ 195edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectstruct threadDetails { 196edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project int (*func)(void*); 197edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project void* arg; 198edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project}; 199edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectstatic __stdcall unsigned int threadIntermediary(void* vDetails) 200edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 201edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project struct threadDetails* pDetails = (struct threadDetails*) vDetails; 202edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project int result; 203edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 204edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project result = (*(pDetails->func))(pDetails->arg); 205edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 206edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project delete pDetails; 207edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 2089f760150f6e0f39b9923cfdc875373606839ee00Steve Block ALOG(LOG_VERBOSE, "thread", "thread exiting\n"); 209edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return (unsigned int) result; 210edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 211edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 212edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project/* 213edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * Create and run a new thread. 214edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project */ 215edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectstatic bool doCreateThread(android_thread_func_t fn, void* arg, android_thread_id_t *id) 216edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 217edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project HANDLE hThread; 218edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project struct threadDetails* pDetails = new threadDetails; // must be on heap 219edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project unsigned int thrdaddr; 220edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 221edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project pDetails->func = fn; 222edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project pDetails->arg = arg; 223edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 224edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#if defined(HAVE__BEGINTHREADEX) 225edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project hThread = (HANDLE) _beginthreadex(NULL, 0, threadIntermediary, pDetails, 0, 226edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project &thrdaddr); 227edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (hThread == 0) 228edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#elif defined(HAVE_CREATETHREAD) 229edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project hThread = CreateThread(NULL, 0, 230edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project (LPTHREAD_START_ROUTINE) threadIntermediary, 231edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project (void*) pDetails, 0, (DWORD*) &thrdaddr); 232edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (hThread == NULL) 233edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#endif 234edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project { 2359f760150f6e0f39b9923cfdc875373606839ee00Steve Block ALOG(LOG_WARN, "thread", "WARNING: thread create failed\n"); 236edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return false; 237edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 238edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 239edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#if defined(HAVE_CREATETHREAD) 240edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project /* close the management handle */ 241edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project CloseHandle(hThread); 242edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#endif 243edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 244edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (id != NULL) { 245edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project *id = (android_thread_id_t)thrdaddr; 246edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 247edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 248edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return true; 249edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 250edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 251edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectint androidCreateRawThreadEtc(android_thread_func_t fn, 252edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project void *userData, 253edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project const char* threadName, 254edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project int32_t threadPriority, 255edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project size_t threadStackSize, 256edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project android_thread_id_t *threadId) 257edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 258edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return doCreateThread( fn, userData, threadId); 259edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 260edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 261edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectandroid_thread_id_t androidGetThreadId() 262edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 263edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return (android_thread_id_t)GetCurrentThreadId(); 264edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 265edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 266edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project// ---------------------------------------------------------------------------- 267edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#else 268edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#error "Threads not supported" 269edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#endif 270edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 271edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project// ---------------------------------------------------------------------------- 272edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 273edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectint androidCreateThread(android_thread_func_t fn, void* arg) 274edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 275edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return createThreadEtc(fn, arg); 276edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 277edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 278edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectint androidCreateThreadGetID(android_thread_func_t fn, void *arg, android_thread_id_t *id) 279edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 280edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return createThreadEtc(fn, arg, "android:unnamed_thread", 281edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project PRIORITY_DEFAULT, 0, id); 282edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 283edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 284edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectstatic android_create_thread_fn gCreateThreadFn = androidCreateRawThreadEtc; 285edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 286edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectint androidCreateThreadEtc(android_thread_func_t entryFunction, 287edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project void *userData, 288edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project const char* threadName, 289edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project int32_t threadPriority, 290edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project size_t threadStackSize, 291edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project android_thread_id_t *threadId) 292edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 293edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return gCreateThreadFn(entryFunction, userData, threadName, 294edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project threadPriority, threadStackSize, threadId); 295edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 296edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 297edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectvoid androidSetCreateThreadFunc(android_create_thread_fn func) 298edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 299edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project gCreateThreadFn = func; 300edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 301edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 3028c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackbornpid_t androidGetTid() 3038c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn{ 3048c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn#ifdef HAVE_GETTID 3058c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn return gettid(); 3068c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn#else 3078c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn return getpid(); 3088c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn#endif 3098c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn} 3108c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn 3118c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackbornint androidSetThreadSchedulingGroup(pid_t tid, int grp) 3128c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn{ 3138c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn if (grp > ANDROID_TGROUP_MAX || grp < 0) { 3148c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn return BAD_VALUE; 3158c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn } 3168c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn 317d0aeccebe2d1539a9f0b5f19beb6c272a60d3cc6Dianne Hackborn#if defined(HAVE_PTHREADS) 3187b0d45c3465304ccdd29ad20f43270ffd5a6aec0Dianne Hackborn pthread_once(&gDoSchedulingGroupOnce, checkDoSchedulingGroup); 3197b0d45c3465304ccdd29ad20f43270ffd5a6aec0Dianne Hackborn if (gDoSchedulingGroup) { 320ce63396effb32212501658c25f2ec6d1bd8b0307Glenn Kasten // set_sched_policy does not support tid == 0 321ce63396effb32212501658c25f2ec6d1bd8b0307Glenn Kasten if (tid == 0) { 322ce63396effb32212501658c25f2ec6d1bd8b0307Glenn Kasten tid = androidGetTid(); 323ce63396effb32212501658c25f2ec6d1bd8b0307Glenn Kasten } 3247b0d45c3465304ccdd29ad20f43270ffd5a6aec0Dianne Hackborn if (set_sched_policy(tid, (grp == ANDROID_TGROUP_BG_NONINTERACT) ? 3257b0d45c3465304ccdd29ad20f43270ffd5a6aec0Dianne Hackborn SP_BACKGROUND : SP_FOREGROUND)) { 3267b0d45c3465304ccdd29ad20f43270ffd5a6aec0Dianne Hackborn return PERMISSION_DENIED; 3277b0d45c3465304ccdd29ad20f43270ffd5a6aec0Dianne Hackborn } 3288c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn } 329d0aeccebe2d1539a9f0b5f19beb6c272a60d3cc6Dianne Hackborn#endif 3308c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn 3318c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn return NO_ERROR; 3328c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn} 3338c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn 3348c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackbornint androidSetThreadPriority(pid_t tid, int pri) 3358c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn{ 3368c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn int rc = 0; 337d0aeccebe2d1539a9f0b5f19beb6c272a60d3cc6Dianne Hackborn 338d0aeccebe2d1539a9f0b5f19beb6c272a60d3cc6Dianne Hackborn#if defined(HAVE_PTHREADS) 3398c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn int lasterr = 0; 3408c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn 3417b0d45c3465304ccdd29ad20f43270ffd5a6aec0Dianne Hackborn pthread_once(&gDoSchedulingGroupOnce, checkDoSchedulingGroup); 3427b0d45c3465304ccdd29ad20f43270ffd5a6aec0Dianne Hackborn if (gDoSchedulingGroup) { 343f0c412513ff0efe0df40325d98a99de7634548eeGlenn Kasten // set_sched_policy does not support tid == 0 344f0c412513ff0efe0df40325d98a99de7634548eeGlenn Kasten int policy_tid; 345f0c412513ff0efe0df40325d98a99de7634548eeGlenn Kasten if (tid == 0) { 346f0c412513ff0efe0df40325d98a99de7634548eeGlenn Kasten policy_tid = androidGetTid(); 347f0c412513ff0efe0df40325d98a99de7634548eeGlenn Kasten } else { 348f0c412513ff0efe0df40325d98a99de7634548eeGlenn Kasten policy_tid = tid; 349f0c412513ff0efe0df40325d98a99de7634548eeGlenn Kasten } 3507b0d45c3465304ccdd29ad20f43270ffd5a6aec0Dianne Hackborn if (pri >= ANDROID_PRIORITY_BACKGROUND) { 351f0c412513ff0efe0df40325d98a99de7634548eeGlenn Kasten rc = set_sched_policy(policy_tid, SP_BACKGROUND); 3527b0d45c3465304ccdd29ad20f43270ffd5a6aec0Dianne Hackborn } else if (getpriority(PRIO_PROCESS, tid) >= ANDROID_PRIORITY_BACKGROUND) { 353f0c412513ff0efe0df40325d98a99de7634548eeGlenn Kasten rc = set_sched_policy(policy_tid, SP_FOREGROUND); 3547b0d45c3465304ccdd29ad20f43270ffd5a6aec0Dianne Hackborn } 3558c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn } 3568c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn 3578c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn if (rc) { 3588c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn lasterr = errno; 3598c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn } 3608c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn 3618c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn if (setpriority(PRIO_PROCESS, tid, pri) < 0) { 3628c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn rc = INVALID_OPERATION; 3638c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn } else { 3648c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn errno = lasterr; 3658c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn } 366c5b138995e68910cfa95f88f12a1c69a102aa997Dianne Hackborn#endif 3678c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn 3688c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn return rc; 3698c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn} 3708c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn 3711d60b9629c022811e5efca71eb4d03f8b16a4cb0Andreas Huberint androidGetThreadPriority(pid_t tid) { 3729dbb77d04b12a3f45ebd156087f6ccb478b35a87Andreas Huber#if defined(HAVE_PTHREADS) 3731d60b9629c022811e5efca71eb4d03f8b16a4cb0Andreas Huber return getpriority(PRIO_PROCESS, tid); 3749dbb77d04b12a3f45ebd156087f6ccb478b35a87Andreas Huber#else 3759dbb77d04b12a3f45ebd156087f6ccb478b35a87Andreas Huber return ANDROID_PRIORITY_NORMAL; 3769dbb77d04b12a3f45ebd156087f6ccb478b35a87Andreas Huber#endif 3771d60b9629c022811e5efca71eb4d03f8b16a4cb0Andreas Huber} 3781d60b9629c022811e5efca71eb4d03f8b16a4cb0Andreas Huber 3794fb24275919aab88d0ce346f530c9911d6c08422Glenn Kastenint androidGetThreadSchedulingGroup(pid_t tid) 3804fb24275919aab88d0ce346f530c9911d6c08422Glenn Kasten{ 3814fb24275919aab88d0ce346f530c9911d6c08422Glenn Kasten int ret = ANDROID_TGROUP_DEFAULT; 3824fb24275919aab88d0ce346f530c9911d6c08422Glenn Kasten 3834fb24275919aab88d0ce346f530c9911d6c08422Glenn Kasten#if defined(HAVE_PTHREADS) 3844fb24275919aab88d0ce346f530c9911d6c08422Glenn Kasten // convention is to not call get/set_sched_policy methods if disabled by property 3854fb24275919aab88d0ce346f530c9911d6c08422Glenn Kasten pthread_once(&gDoSchedulingGroupOnce, checkDoSchedulingGroup); 3864fb24275919aab88d0ce346f530c9911d6c08422Glenn Kasten if (gDoSchedulingGroup) { 3874fb24275919aab88d0ce346f530c9911d6c08422Glenn Kasten SchedPolicy policy; 3884fb24275919aab88d0ce346f530c9911d6c08422Glenn Kasten // get_sched_policy does not support tid == 0 3894fb24275919aab88d0ce346f530c9911d6c08422Glenn Kasten if (tid == 0) { 3904fb24275919aab88d0ce346f530c9911d6c08422Glenn Kasten tid = androidGetTid(); 3914fb24275919aab88d0ce346f530c9911d6c08422Glenn Kasten } 3924fb24275919aab88d0ce346f530c9911d6c08422Glenn Kasten if (get_sched_policy(tid, &policy) < 0) { 3934fb24275919aab88d0ce346f530c9911d6c08422Glenn Kasten ret = INVALID_OPERATION; 3944fb24275919aab88d0ce346f530c9911d6c08422Glenn Kasten } else { 3954fb24275919aab88d0ce346f530c9911d6c08422Glenn Kasten switch (policy) { 3964fb24275919aab88d0ce346f530c9911d6c08422Glenn Kasten case SP_BACKGROUND: 3974fb24275919aab88d0ce346f530c9911d6c08422Glenn Kasten ret = ANDROID_TGROUP_BG_NONINTERACT; 3984fb24275919aab88d0ce346f530c9911d6c08422Glenn Kasten break; 3994fb24275919aab88d0ce346f530c9911d6c08422Glenn Kasten case SP_FOREGROUND: 4004fb24275919aab88d0ce346f530c9911d6c08422Glenn Kasten ret = ANDROID_TGROUP_FG_BOOST; 4014fb24275919aab88d0ce346f530c9911d6c08422Glenn Kasten break; 4024fb24275919aab88d0ce346f530c9911d6c08422Glenn Kasten default: 4034fb24275919aab88d0ce346f530c9911d6c08422Glenn Kasten // should not happen, as enum SchedPolicy does not have any other values 4044fb24275919aab88d0ce346f530c9911d6c08422Glenn Kasten ret = INVALID_OPERATION; 4054fb24275919aab88d0ce346f530c9911d6c08422Glenn Kasten break; 4064fb24275919aab88d0ce346f530c9911d6c08422Glenn Kasten } 4074fb24275919aab88d0ce346f530c9911d6c08422Glenn Kasten } 4084fb24275919aab88d0ce346f530c9911d6c08422Glenn Kasten } 4094fb24275919aab88d0ce346f530c9911d6c08422Glenn Kasten#endif 4104fb24275919aab88d0ce346f530c9911d6c08422Glenn Kasten 4114fb24275919aab88d0ce346f530c9911d6c08422Glenn Kasten return ret; 4124fb24275919aab88d0ce346f530c9911d6c08422Glenn Kasten} 4134fb24275919aab88d0ce346f530c9911d6c08422Glenn Kasten 414edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectnamespace android { 415edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 416edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project/* 417edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * =========================================================================== 418edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * Mutex class 419edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * =========================================================================== 420edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project */ 421edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 422ec0f1f6720cd7ecffab54b0dfc2553b55a38e50fMathias Agopian#if defined(HAVE_PTHREADS) 423ec0f1f6720cd7ecffab54b0dfc2553b55a38e50fMathias Agopian// implemented as inlines in threads.h 424edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#elif defined(HAVE_WIN32_THREADS) 425edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 426edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source ProjectMutex::Mutex() 427edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 428edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project HANDLE hMutex; 429edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 430edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project assert(sizeof(hMutex) == sizeof(mState)); 431edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 432edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project hMutex = CreateMutex(NULL, FALSE, NULL); 433edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project mState = (void*) hMutex; 434edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 435edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 436edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source ProjectMutex::Mutex(const char* name) 437edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 438edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // XXX: name not used for now 439edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project HANDLE hMutex; 440edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 441429db150affcc99b198fa0da52165fde4cd4cc7cDavid 'Digit' Turner assert(sizeof(hMutex) == sizeof(mState)); 442429db150affcc99b198fa0da52165fde4cd4cc7cDavid 'Digit' Turner 443429db150affcc99b198fa0da52165fde4cd4cc7cDavid 'Digit' Turner hMutex = CreateMutex(NULL, FALSE, NULL); 444429db150affcc99b198fa0da52165fde4cd4cc7cDavid 'Digit' Turner mState = (void*) hMutex; 445429db150affcc99b198fa0da52165fde4cd4cc7cDavid 'Digit' Turner} 446429db150affcc99b198fa0da52165fde4cd4cc7cDavid 'Digit' Turner 447429db150affcc99b198fa0da52165fde4cd4cc7cDavid 'Digit' TurnerMutex::Mutex(int type, const char* name) 448429db150affcc99b198fa0da52165fde4cd4cc7cDavid 'Digit' Turner{ 449429db150affcc99b198fa0da52165fde4cd4cc7cDavid 'Digit' Turner // XXX: type and name not used for now 450429db150affcc99b198fa0da52165fde4cd4cc7cDavid 'Digit' Turner HANDLE hMutex; 451429db150affcc99b198fa0da52165fde4cd4cc7cDavid 'Digit' Turner 452429db150affcc99b198fa0da52165fde4cd4cc7cDavid 'Digit' Turner assert(sizeof(hMutex) == sizeof(mState)); 453429db150affcc99b198fa0da52165fde4cd4cc7cDavid 'Digit' Turner 454edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project hMutex = CreateMutex(NULL, FALSE, NULL); 455edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project mState = (void*) hMutex; 456edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 457edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 458edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source ProjectMutex::~Mutex() 459edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 460edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project CloseHandle((HANDLE) mState); 461edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 462edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 463edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectstatus_t Mutex::lock() 464edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 465edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project DWORD dwWaitResult; 466edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project dwWaitResult = WaitForSingleObject((HANDLE) mState, INFINITE); 467edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return dwWaitResult != WAIT_OBJECT_0 ? -1 : NO_ERROR; 468edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 469edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 470edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectvoid Mutex::unlock() 471edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 472edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (!ReleaseMutex((HANDLE) mState)) 4739f760150f6e0f39b9923cfdc875373606839ee00Steve Block ALOG(LOG_WARN, "thread", "WARNING: bad result from unlocking mutex\n"); 474edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 475edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 476edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectstatus_t Mutex::tryLock() 477edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 478edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project DWORD dwWaitResult; 479edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 480edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project dwWaitResult = WaitForSingleObject((HANDLE) mState, 0); 481edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (dwWaitResult != WAIT_OBJECT_0 && dwWaitResult != WAIT_TIMEOUT) 4829f760150f6e0f39b9923cfdc875373606839ee00Steve Block ALOG(LOG_WARN, "thread", "WARNING: bad result from try-locking mutex\n"); 483edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return (dwWaitResult == WAIT_OBJECT_0) ? 0 : -1; 484edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 485edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 486edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#else 487edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#error "Somebody forgot to implement threads for this platform." 488edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#endif 489edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 490edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 491edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project/* 492edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * =========================================================================== 493edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * Condition class 494edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * =========================================================================== 495edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project */ 496edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 497ec0f1f6720cd7ecffab54b0dfc2553b55a38e50fMathias Agopian#if defined(HAVE_PTHREADS) 498ec0f1f6720cd7ecffab54b0dfc2553b55a38e50fMathias Agopian// implemented as inlines in threads.h 499edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#elif defined(HAVE_WIN32_THREADS) 500edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 501edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project/* 502edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * Windows doesn't have a condition variable solution. It's possible 503edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * to create one, but it's easy to get it wrong. For a discussion, and 504edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * the origin of this implementation, see: 505edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * 506edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * http://www.cs.wustl.edu/~schmidt/win32-cv-1.html 507edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * 508edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * The implementation shown on the page does NOT follow POSIX semantics. 509edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * As an optimization they require acquiring the external mutex before 510edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * calling signal() and broadcast(), whereas POSIX only requires grabbing 511edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * it before calling wait(). The implementation here has been un-optimized 512edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * to have the correct behavior. 513edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project */ 514edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projecttypedef struct WinCondition { 515edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Number of waiting threads. 516edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project int waitersCount; 517edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 518edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Serialize access to waitersCount. 519edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project CRITICAL_SECTION waitersCountLock; 520edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 521edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Semaphore used to queue up threads waiting for the condition to 522edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // become signaled. 523edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project HANDLE sema; 524edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 525edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // An auto-reset event used by the broadcast/signal thread to wait 526edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // for all the waiting thread(s) to wake up and be released from 527edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // the semaphore. 528edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project HANDLE waitersDone; 529edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 530edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // This mutex wouldn't be necessary if we required that the caller 531edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // lock the external mutex before calling signal() and broadcast(). 532edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // I'm trying to mimic pthread semantics though. 533edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project HANDLE internalMutex; 534edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 535edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Keeps track of whether we were broadcasting or signaling. This 536edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // allows us to optimize the code if we're just signaling. 537edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project bool wasBroadcast; 538edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 539edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project status_t wait(WinCondition* condState, HANDLE hMutex, nsecs_t* abstime) 540edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project { 541edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Increment the wait count, avoiding race conditions. 542edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project EnterCriticalSection(&condState->waitersCountLock); 543edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project condState->waitersCount++; 544edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project //printf("+++ wait: incr waitersCount to %d (tid=%ld)\n", 545edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // condState->waitersCount, getThreadId()); 546edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project LeaveCriticalSection(&condState->waitersCountLock); 547edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 548edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project DWORD timeout = INFINITE; 549edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (abstime) { 550edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project nsecs_t reltime = *abstime - systemTime(); 551edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (reltime < 0) 552edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project reltime = 0; 553edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project timeout = reltime/1000000; 554edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 555edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 556edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Atomically release the external mutex and wait on the semaphore. 557edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project DWORD res = 558edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project SignalObjectAndWait(hMutex, condState->sema, timeout, FALSE); 559edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 560edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project //printf("+++ wait: awake (tid=%ld)\n", getThreadId()); 561edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 562edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Reacquire lock to avoid race conditions. 563edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project EnterCriticalSection(&condState->waitersCountLock); 564edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 565edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // No longer waiting. 566edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project condState->waitersCount--; 567edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 568edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Check to see if we're the last waiter after a broadcast. 569edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project bool lastWaiter = (condState->wasBroadcast && condState->waitersCount == 0); 570edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 571edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project //printf("+++ wait: lastWaiter=%d (wasBc=%d wc=%d)\n", 572edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // lastWaiter, condState->wasBroadcast, condState->waitersCount); 573edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 574edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project LeaveCriticalSection(&condState->waitersCountLock); 575edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 576edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // If we're the last waiter thread during this particular broadcast 577edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // then signal broadcast() that we're all awake. It'll drop the 578edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // internal mutex. 579edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (lastWaiter) { 580edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Atomically signal the "waitersDone" event and wait until we 581edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // can acquire the internal mutex. We want to do this in one step 582edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // because it ensures that everybody is in the mutex FIFO before 583edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // any thread has a chance to run. Without it, another thread 584edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // could wake up, do work, and hop back in ahead of us. 585edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project SignalObjectAndWait(condState->waitersDone, condState->internalMutex, 586edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project INFINITE, FALSE); 587edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } else { 588edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Grab the internal mutex. 589edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project WaitForSingleObject(condState->internalMutex, INFINITE); 590edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 591edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 592edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Release the internal and grab the external. 593edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project ReleaseMutex(condState->internalMutex); 594edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project WaitForSingleObject(hMutex, INFINITE); 595edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 596edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return res == WAIT_OBJECT_0 ? NO_ERROR : -1; 597edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 598edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} WinCondition; 599edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 600edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project/* 601edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * Constructor. Set up the WinCondition stuff. 602edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project */ 603edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source ProjectCondition::Condition() 604edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 605edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project WinCondition* condState = new WinCondition; 606edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 607edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project condState->waitersCount = 0; 608edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project condState->wasBroadcast = false; 609edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // semaphore: no security, initial value of 0 610edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project condState->sema = CreateSemaphore(NULL, 0, 0x7fffffff, NULL); 611edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project InitializeCriticalSection(&condState->waitersCountLock); 612edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // auto-reset event, not signaled initially 613edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project condState->waitersDone = CreateEvent(NULL, FALSE, FALSE, NULL); 614edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // used so we don't have to lock external mutex on signal/broadcast 615edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project condState->internalMutex = CreateMutex(NULL, FALSE, NULL); 616edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 617edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project mState = condState; 618edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 619edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 620edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project/* 621edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * Destructor. Free Windows resources as well as our allocated storage. 622edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project */ 623edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source ProjectCondition::~Condition() 624edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 625edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project WinCondition* condState = (WinCondition*) mState; 626edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (condState != NULL) { 627edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project CloseHandle(condState->sema); 628edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project CloseHandle(condState->waitersDone); 629edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project delete condState; 630edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 631edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 632edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 633edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 634edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectstatus_t Condition::wait(Mutex& mutex) 635edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 636edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project WinCondition* condState = (WinCondition*) mState; 637edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project HANDLE hMutex = (HANDLE) mutex.mState; 638edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 639edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return ((WinCondition*)mState)->wait(condState, hMutex, NULL); 640edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 641edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 642edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectstatus_t Condition::waitRelative(Mutex& mutex, nsecs_t reltime) 643edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 644429db150affcc99b198fa0da52165fde4cd4cc7cDavid 'Digit' Turner WinCondition* condState = (WinCondition*) mState; 645429db150affcc99b198fa0da52165fde4cd4cc7cDavid 'Digit' Turner HANDLE hMutex = (HANDLE) mutex.mState; 646429db150affcc99b198fa0da52165fde4cd4cc7cDavid 'Digit' Turner nsecs_t absTime = systemTime()+reltime; 647429db150affcc99b198fa0da52165fde4cd4cc7cDavid 'Digit' Turner 648429db150affcc99b198fa0da52165fde4cd4cc7cDavid 'Digit' Turner return ((WinCondition*)mState)->wait(condState, hMutex, &absTime); 649edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 650edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 651edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project/* 652edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * Signal the condition variable, allowing one thread to continue. 653edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project */ 654edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectvoid Condition::signal() 655edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 656edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project WinCondition* condState = (WinCondition*) mState; 657edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 658edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Lock the internal mutex. This ensures that we don't clash with 659edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // broadcast(). 660edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project WaitForSingleObject(condState->internalMutex, INFINITE); 661edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 662edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project EnterCriticalSection(&condState->waitersCountLock); 663edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project bool haveWaiters = (condState->waitersCount > 0); 664edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project LeaveCriticalSection(&condState->waitersCountLock); 665edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 666edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // If no waiters, then this is a no-op. Otherwise, knock the semaphore 667edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // down a notch. 668edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (haveWaiters) 669edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project ReleaseSemaphore(condState->sema, 1, 0); 670edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 671edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Release internal mutex. 672edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project ReleaseMutex(condState->internalMutex); 673edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 674edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 675edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project/* 676edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * Signal the condition variable, allowing all threads to continue. 677edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * 678edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * First we have to wake up all threads waiting on the semaphore, then 679edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * we wait until all of the threads have actually been woken before 680edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * releasing the internal mutex. This ensures that all threads are woken. 681edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project */ 682edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectvoid Condition::broadcast() 683edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 684edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project WinCondition* condState = (WinCondition*) mState; 685edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 686edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Lock the internal mutex. This keeps the guys we're waking up 687edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // from getting too far. 688edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project WaitForSingleObject(condState->internalMutex, INFINITE); 689edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 690edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project EnterCriticalSection(&condState->waitersCountLock); 691edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project bool haveWaiters = false; 692edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 693edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (condState->waitersCount > 0) { 694edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project haveWaiters = true; 695edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project condState->wasBroadcast = true; 696edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 697edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 698edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (haveWaiters) { 699edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Wake up all the waiters. 700edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project ReleaseSemaphore(condState->sema, condState->waitersCount, 0); 701edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 702edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project LeaveCriticalSection(&condState->waitersCountLock); 703edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 704edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Wait for all awakened threads to acquire the counting semaphore. 705edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // The last guy who was waiting sets this. 706edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project WaitForSingleObject(condState->waitersDone, INFINITE); 707edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 708edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Reset wasBroadcast. (No crit section needed because nobody 709edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // else can wake up to poke at it.) 710edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project condState->wasBroadcast = 0; 711edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } else { 712edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // nothing to do 713edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project LeaveCriticalSection(&condState->waitersCountLock); 714edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 715edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 716edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Release internal mutex. 717edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project ReleaseMutex(condState->internalMutex); 718edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 719edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 720edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#else 721edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#error "condition variables not supported on this platform" 722edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#endif 723edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 724edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project// ---------------------------------------------------------------------------- 725edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 726edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project/* 727edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * This is our thread object! 728edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project */ 729edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 730edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source ProjectThread::Thread(bool canCallJava) 731edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project : mCanCallJava(canCallJava), 732edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project mThread(thread_id_t(-1)), 733edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project mLock("Thread::mLock"), 734edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project mStatus(NO_ERROR), 735edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project mExitPending(false), mRunning(false) 7367e453a51a5436c6c8c49c1e37cea5077bce09405Glenn Kasten#ifdef HAVE_ANDROID_OS 7377e453a51a5436c6c8c49c1e37cea5077bce09405Glenn Kasten , mTid(-1) 7387e453a51a5436c6c8c49c1e37cea5077bce09405Glenn Kasten#endif 739edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 740edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 741edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 742edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source ProjectThread::~Thread() 743edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 744edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 745edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 746edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectstatus_t Thread::readyToRun() 747edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 748edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return NO_ERROR; 749edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 750edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 751edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectstatus_t Thread::run(const char* name, int32_t priority, size_t stack) 752edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 753edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project Mutex::Autolock _l(mLock); 754edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 755edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (mRunning) { 756edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // thread already started 757edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return INVALID_OPERATION; 758edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 759edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 760edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // reset status and exitPending to their default value, so we can 761edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // try again after an error happened (either below, or in readyToRun()) 762edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project mStatus = NO_ERROR; 763edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project mExitPending = false; 764edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project mThread = thread_id_t(-1); 765edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 766edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // hold a strong reference on ourself 767edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project mHoldSelf = this; 768edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 7699adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project mRunning = true; 7709adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project 771edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project bool res; 772edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (mCanCallJava) { 773edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project res = createThreadEtc(_threadLoop, 774edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project this, name, priority, stack, &mThread); 775edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } else { 776edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project res = androidCreateRawThreadEtc(_threadLoop, 777edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project this, name, priority, stack, &mThread); 778edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 779edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 780edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (res == false) { 781edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project mStatus = UNKNOWN_ERROR; // something happened! 782edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project mRunning = false; 783edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project mThread = thread_id_t(-1); 7849adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project mHoldSelf.clear(); // "this" may have gone away after this. 7859adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project 7869adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project return UNKNOWN_ERROR; 787edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 788edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 7899adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project // Do not refer to mStatus here: The thread is already running (may, in fact 7909adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project // already have exited with a valid mStatus result). The NO_ERROR indication 7919adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project // here merely indicates successfully starting the thread and does not 7929adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project // imply successful termination/execution. 7939adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project return NO_ERROR; 7947e453a51a5436c6c8c49c1e37cea5077bce09405Glenn Kasten 7957e453a51a5436c6c8c49c1e37cea5077bce09405Glenn Kasten // Exiting scope of mLock is a memory barrier and allows new thread to run 796edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 797edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 798edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectint Thread::_threadLoop(void* user) 799edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 800edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project Thread* const self = static_cast<Thread*>(user); 8017e453a51a5436c6c8c49c1e37cea5077bce09405Glenn Kasten 802edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project sp<Thread> strong(self->mHoldSelf); 803edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project wp<Thread> weak(strong); 804edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project self->mHoldSelf.clear(); 805edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 806af1cf07134dccc884c654da0e713c9213d7be3f4Kenny Root#ifdef HAVE_ANDROID_OS 8074de4ebf6a25b5cf1819809ffcedea331d79823e0Mathias Agopian // this is very useful for debugging with gdb 8084de4ebf6a25b5cf1819809ffcedea331d79823e0Mathias Agopian self->mTid = gettid(); 8094de4ebf6a25b5cf1819809ffcedea331d79823e0Mathias Agopian#endif 8104de4ebf6a25b5cf1819809ffcedea331d79823e0Mathias Agopian 8119adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project bool first = true; 812edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 813edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project do { 8149adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project bool result; 8159adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project if (first) { 8169adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project first = false; 8179adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project self->mStatus = self->readyToRun(); 8189adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project result = (self->mStatus == NO_ERROR); 8199adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project 8207e453a51a5436c6c8c49c1e37cea5077bce09405Glenn Kasten if (result && !self->exitPending()) { 8219adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project // Binder threads (and maybe others) rely on threadLoop 8229adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project // running at least once after a successful ::readyToRun() 8239adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project // (unless, of course, the thread has already been asked to exit 8249adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project // at that point). 8259adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project // This is because threads are essentially used like this: 8269adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project // (new ThreadSubclass())->run(); 8279adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project // The caller therefore does not retain a strong reference to 8289adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project // the thread and the thread would simply disappear after the 8299adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project // successful ::readyToRun() call instead of entering the 8309adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project // threadLoop at least once. 8319adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project result = self->threadLoop(); 8329adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project } 8339adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project } else { 8349adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project result = self->threadLoop(); 8359adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project } 8369adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project 8377e453a51a5436c6c8c49c1e37cea5077bce09405Glenn Kasten // establish a scope for mLock 8387e453a51a5436c6c8c49c1e37cea5077bce09405Glenn Kasten { 8397e453a51a5436c6c8c49c1e37cea5077bce09405Glenn Kasten Mutex::Autolock _l(self->mLock); 840edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (result == false || self->mExitPending) { 841edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project self->mExitPending = true; 842edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project self->mRunning = false; 843a017d5b37968b2a70d8c25846bfeb9b35d0f7e9dEric Laurent // clear thread ID so that requestExitAndWait() does not exit if 844a017d5b37968b2a70d8c25846bfeb9b35d0f7e9dEric Laurent // called by a new thread using the same thread ID as this one. 845a017d5b37968b2a70d8c25846bfeb9b35d0f7e9dEric Laurent self->mThread = thread_id_t(-1); 8467e453a51a5436c6c8c49c1e37cea5077bce09405Glenn Kasten // note that interested observers blocked in requestExitAndWait are 8477e453a51a5436c6c8c49c1e37cea5077bce09405Glenn Kasten // awoken by broadcast, but blocked on mLock until break exits scope 8484de4ebf6a25b5cf1819809ffcedea331d79823e0Mathias Agopian self->mThreadExitedCondition.broadcast(); 849edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project break; 850edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 8517e453a51a5436c6c8c49c1e37cea5077bce09405Glenn Kasten } 852edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 853edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Release our strong reference, to let a chance to the thread 854edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // to die a peaceful death. 855edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project strong.clear(); 8564de4ebf6a25b5cf1819809ffcedea331d79823e0Mathias Agopian // And immediately, re-acquire a strong reference for the next loop 857edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project strong = weak.promote(); 858edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } while(strong != 0); 859edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 860edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return 0; 861edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 862edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 863edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectvoid Thread::requestExit() 864edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 8657e453a51a5436c6c8c49c1e37cea5077bce09405Glenn Kasten Mutex::Autolock _l(mLock); 866edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project mExitPending = true; 867edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 868edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 869edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectstatus_t Thread::requestExitAndWait() 870edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 871d9e1bb76fe1e01fb79bb65959b92051aa18fddbeGlenn Kasten Mutex::Autolock _l(mLock); 8729adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project if (mThread == getThreadId()) { 87332397c1cd3327905173b36baa6fd1c579bc328ffSteve Block ALOGW( 8749adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project "Thread (this=%p): don't call waitForExit() from this " 8759adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project "Thread object's thread. It's a guaranteed deadlock!", 8769adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project this); 877edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 8789adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project return WOULD_BLOCK; 879edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 8809adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project 881d9e1bb76fe1e01fb79bb65959b92051aa18fddbeGlenn Kasten mExitPending = true; 8829adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project 8839adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project while (mRunning == true) { 8849adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project mThreadExitedCondition.wait(mLock); 8859adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project } 8867e453a51a5436c6c8c49c1e37cea5077bce09405Glenn Kasten // This next line is probably not needed any more, but is being left for 8877e453a51a5436c6c8c49c1e37cea5077bce09405Glenn Kasten // historical reference. Note that each interested party will clear flag. 8889adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project mExitPending = false; 8899adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project 890edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return mStatus; 891edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 892edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 89358e012d1e37e1272d43c9ff0f56c9b236dd1d7f1Glenn Kastenstatus_t Thread::join() 89458e012d1e37e1272d43c9ff0f56c9b236dd1d7f1Glenn Kasten{ 89558e012d1e37e1272d43c9ff0f56c9b236dd1d7f1Glenn Kasten Mutex::Autolock _l(mLock); 89658e012d1e37e1272d43c9ff0f56c9b236dd1d7f1Glenn Kasten if (mThread == getThreadId()) { 89732397c1cd3327905173b36baa6fd1c579bc328ffSteve Block ALOGW( 89858e012d1e37e1272d43c9ff0f56c9b236dd1d7f1Glenn Kasten "Thread (this=%p): don't call join() from this " 89958e012d1e37e1272d43c9ff0f56c9b236dd1d7f1Glenn Kasten "Thread object's thread. It's a guaranteed deadlock!", 90058e012d1e37e1272d43c9ff0f56c9b236dd1d7f1Glenn Kasten this); 90158e012d1e37e1272d43c9ff0f56c9b236dd1d7f1Glenn Kasten 90258e012d1e37e1272d43c9ff0f56c9b236dd1d7f1Glenn Kasten return WOULD_BLOCK; 90358e012d1e37e1272d43c9ff0f56c9b236dd1d7f1Glenn Kasten } 90458e012d1e37e1272d43c9ff0f56c9b236dd1d7f1Glenn Kasten 90558e012d1e37e1272d43c9ff0f56c9b236dd1d7f1Glenn Kasten while (mRunning == true) { 90658e012d1e37e1272d43c9ff0f56c9b236dd1d7f1Glenn Kasten mThreadExitedCondition.wait(mLock); 90758e012d1e37e1272d43c9ff0f56c9b236dd1d7f1Glenn Kasten } 90858e012d1e37e1272d43c9ff0f56c9b236dd1d7f1Glenn Kasten 90958e012d1e37e1272d43c9ff0f56c9b236dd1d7f1Glenn Kasten return mStatus; 91058e012d1e37e1272d43c9ff0f56c9b236dd1d7f1Glenn Kasten} 91158e012d1e37e1272d43c9ff0f56c9b236dd1d7f1Glenn Kasten 912edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectbool Thread::exitPending() const 913edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 9147e453a51a5436c6c8c49c1e37cea5077bce09405Glenn Kasten Mutex::Autolock _l(mLock); 915edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return mExitPending; 916edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 917edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 918edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 919edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 920edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project}; // namespace android 921