Threads.cpp revision 7b0d45c3465304ccdd29ad20f43270ffd5a6aec0
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 68edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectstruct thread_data_t { 69edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project thread_func_t entryFunction; 70edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project void* userData; 71edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project int priority; 72edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project char * threadName; 73edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 74edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // we use this trampoline when we need to set the priority with 75edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // nice/setpriority. 76edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project static int trampoline(const thread_data_t* t) { 77edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project thread_func_t f = t->entryFunction; 78edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project void* u = t->userData; 79edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project int prio = t->priority; 80edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project char * name = t->threadName; 81edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project delete t; 82edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project setpriority(PRIO_PROCESS, 0, prio); 83edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (name) { 84edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#if defined(HAVE_PRCTL) 85edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Mac OS doesn't have this, and we build libutil for the host too 86edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project int hasAt = 0; 87edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project int hasDot = 0; 88edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project char *s = name; 89edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project while (*s) { 90edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (*s == '.') hasDot = 1; 91edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project else if (*s == '@') hasAt = 1; 92edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project s++; 93edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 94edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project int len = s - name; 95edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (len < 15 || hasAt || !hasDot) { 96edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project s = name; 97edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } else { 98edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project s = name + len - 15; 99edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 100edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project prctl(PR_SET_NAME, (unsigned long) s, 0, 0, 0); 101edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#endif 102edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project free(name); 103edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 104edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return f(u); 105edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 106edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project}; 107edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 108edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectint androidCreateRawThreadEtc(android_thread_func_t entryFunction, 109edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project void *userData, 110edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project const char* threadName, 111edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project int32_t threadPriority, 112edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project size_t threadStackSize, 113edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project android_thread_id_t *threadId) 114edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 115edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project pthread_attr_t attr; 116edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project pthread_attr_init(&attr); 117edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); 118edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 119edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#ifdef HAVE_ANDROID_OS /* valgrind is rejecting RT-priority create reqs */ 120edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (threadPriority != PRIORITY_DEFAULT || threadName != NULL) { 121edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // We could avoid the trampoline if there was a way to get to the 122edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // android_thread_id_t (pid) from pthread_t 123edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project thread_data_t* t = new thread_data_t; 124edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project t->priority = threadPriority; 125edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project t->threadName = threadName ? strdup(threadName) : NULL; 126edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project t->entryFunction = entryFunction; 127edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project t->userData = userData; 128edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project entryFunction = (android_thread_func_t)&thread_data_t::trampoline; 129edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project userData = t; 130edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 131edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#endif 132edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 133edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (threadStackSize) { 134edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project pthread_attr_setstacksize(&attr, threadStackSize); 135edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 136edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 137edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project errno = 0; 138edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project pthread_t thread; 139edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project int result = pthread_create(&thread, &attr, 140edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project (android_pthread_entry)entryFunction, userData); 141edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (result != 0) { 142edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project LOGE("androidCreateRawThreadEtc failed (entry=%p, res=%d, errno=%d)\n" 143edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project "(android threadPriority=%d)", 144edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project entryFunction, result, errno, threadPriority); 145edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return 0; 146edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 147edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 148edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (threadId != NULL) { 149edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project *threadId = (android_thread_id_t)thread; // XXX: this is not portable 150edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 151edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return 1; 152edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 153edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 154edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectandroid_thread_id_t androidGetThreadId() 155edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 156edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return (android_thread_id_t)pthread_self(); 157edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 158edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 159edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project// ---------------------------------------------------------------------------- 160edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#elif defined(HAVE_WIN32_THREADS) 161edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project// ---------------------------------------------------------------------------- 162edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 163edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project/* 164edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * Trampoline to make us __stdcall-compliant. 165edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * 166edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * We're expected to delete "vDetails" when we're done. 167edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project */ 168edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectstruct threadDetails { 169edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project int (*func)(void*); 170edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project void* arg; 171edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project}; 172edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectstatic __stdcall unsigned int threadIntermediary(void* vDetails) 173edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 174edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project struct threadDetails* pDetails = (struct threadDetails*) vDetails; 175edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project int result; 176edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 177edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project result = (*(pDetails->func))(pDetails->arg); 178edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 179edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project delete pDetails; 180edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 181edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project LOG(LOG_VERBOSE, "thread", "thread exiting\n"); 182edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return (unsigned int) result; 183edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 184edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 185edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project/* 186edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * Create and run a new thread. 187edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project */ 188edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectstatic bool doCreateThread(android_thread_func_t fn, void* arg, android_thread_id_t *id) 189edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 190edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project HANDLE hThread; 191edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project struct threadDetails* pDetails = new threadDetails; // must be on heap 192edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project unsigned int thrdaddr; 193edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 194edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project pDetails->func = fn; 195edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project pDetails->arg = arg; 196edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 197edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#if defined(HAVE__BEGINTHREADEX) 198edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project hThread = (HANDLE) _beginthreadex(NULL, 0, threadIntermediary, pDetails, 0, 199edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project &thrdaddr); 200edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (hThread == 0) 201edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#elif defined(HAVE_CREATETHREAD) 202edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project hThread = CreateThread(NULL, 0, 203edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project (LPTHREAD_START_ROUTINE) threadIntermediary, 204edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project (void*) pDetails, 0, (DWORD*) &thrdaddr); 205edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (hThread == NULL) 206edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#endif 207edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project { 208edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project LOG(LOG_WARN, "thread", "WARNING: thread create failed\n"); 209edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return false; 210edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 211edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 212edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#if defined(HAVE_CREATETHREAD) 213edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project /* close the management handle */ 214edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project CloseHandle(hThread); 215edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#endif 216edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 217edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (id != NULL) { 218edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project *id = (android_thread_id_t)thrdaddr; 219edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 220edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 221edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return true; 222edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 223edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 224edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectint androidCreateRawThreadEtc(android_thread_func_t fn, 225edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project void *userData, 226edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project const char* threadName, 227edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project int32_t threadPriority, 228edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project size_t threadStackSize, 229edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project android_thread_id_t *threadId) 230edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 231edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return doCreateThread( fn, userData, threadId); 232edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 233edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 234edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectandroid_thread_id_t androidGetThreadId() 235edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 236edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return (android_thread_id_t)GetCurrentThreadId(); 237edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 238edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 239edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project// ---------------------------------------------------------------------------- 240edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#else 241edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#error "Threads not supported" 242edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#endif 243edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 244edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project// ---------------------------------------------------------------------------- 245edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 246edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectint androidCreateThread(android_thread_func_t fn, void* arg) 247edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 248edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return createThreadEtc(fn, arg); 249edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 250edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 251edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectint androidCreateThreadGetID(android_thread_func_t fn, void *arg, android_thread_id_t *id) 252edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 253edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return createThreadEtc(fn, arg, "android:unnamed_thread", 254edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project PRIORITY_DEFAULT, 0, id); 255edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 256edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 257edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectstatic android_create_thread_fn gCreateThreadFn = androidCreateRawThreadEtc; 258edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 259edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectint androidCreateThreadEtc(android_thread_func_t entryFunction, 260edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project void *userData, 261edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project const char* threadName, 262edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project int32_t threadPriority, 263edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project size_t threadStackSize, 264edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project android_thread_id_t *threadId) 265edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 266edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return gCreateThreadFn(entryFunction, userData, threadName, 267edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project threadPriority, threadStackSize, threadId); 268edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 269edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 270edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectvoid androidSetCreateThreadFunc(android_create_thread_fn func) 271edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 272edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project gCreateThreadFn = func; 273edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 274edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 2758c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackbornpid_t androidGetTid() 2768c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn{ 2778c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn#ifdef HAVE_GETTID 2788c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn return gettid(); 2798c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn#else 2808c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn return getpid(); 2818c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn#endif 2828c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn} 2838c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn 2847b0d45c3465304ccdd29ad20f43270ffd5a6aec0Dianne Hackbornstatic pthread_once_t gDoSchedulingGroupOnce = PTHREAD_ONCE_INIT; 2857b0d45c3465304ccdd29ad20f43270ffd5a6aec0Dianne Hackbornstatic bool gDoSchedulingGroup = true; 2867b0d45c3465304ccdd29ad20f43270ffd5a6aec0Dianne Hackborn 2877b0d45c3465304ccdd29ad20f43270ffd5a6aec0Dianne Hackbornstatic void checkDoSchedulingGroup(void) { 2887b0d45c3465304ccdd29ad20f43270ffd5a6aec0Dianne Hackborn char buf[PROPERTY_VALUE_MAX]; 2897b0d45c3465304ccdd29ad20f43270ffd5a6aec0Dianne Hackborn int len = property_get("debug.sys.noschedgroups", buf, ""); 2907b0d45c3465304ccdd29ad20f43270ffd5a6aec0Dianne Hackborn if (len > 0) { 2917b0d45c3465304ccdd29ad20f43270ffd5a6aec0Dianne Hackborn int temp; 2927b0d45c3465304ccdd29ad20f43270ffd5a6aec0Dianne Hackborn if (sscanf(buf, "%d", &temp) == 1) { 2937b0d45c3465304ccdd29ad20f43270ffd5a6aec0Dianne Hackborn gDoSchedulingGroup = temp == 0; 2947b0d45c3465304ccdd29ad20f43270ffd5a6aec0Dianne Hackborn } 2957b0d45c3465304ccdd29ad20f43270ffd5a6aec0Dianne Hackborn } 2967b0d45c3465304ccdd29ad20f43270ffd5a6aec0Dianne Hackborn} 2977b0d45c3465304ccdd29ad20f43270ffd5a6aec0Dianne Hackborn 2988c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackbornint androidSetThreadSchedulingGroup(pid_t tid, int grp) 2998c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn{ 3008c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn if (grp > ANDROID_TGROUP_MAX || grp < 0) { 3018c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn return BAD_VALUE; 3028c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn } 3038c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn 304d0aeccebe2d1539a9f0b5f19beb6c272a60d3cc6Dianne Hackborn#if defined(HAVE_PTHREADS) 3057b0d45c3465304ccdd29ad20f43270ffd5a6aec0Dianne Hackborn pthread_once(&gDoSchedulingGroupOnce, checkDoSchedulingGroup); 3067b0d45c3465304ccdd29ad20f43270ffd5a6aec0Dianne Hackborn if (gDoSchedulingGroup) { 3077b0d45c3465304ccdd29ad20f43270ffd5a6aec0Dianne Hackborn if (set_sched_policy(tid, (grp == ANDROID_TGROUP_BG_NONINTERACT) ? 3087b0d45c3465304ccdd29ad20f43270ffd5a6aec0Dianne Hackborn SP_BACKGROUND : SP_FOREGROUND)) { 3097b0d45c3465304ccdd29ad20f43270ffd5a6aec0Dianne Hackborn return PERMISSION_DENIED; 3107b0d45c3465304ccdd29ad20f43270ffd5a6aec0Dianne Hackborn } 3118c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn } 312d0aeccebe2d1539a9f0b5f19beb6c272a60d3cc6Dianne Hackborn#endif 3138c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn 3148c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn return NO_ERROR; 3158c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn} 3168c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn 3178c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackbornint androidSetThreadPriority(pid_t tid, int pri) 3188c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn{ 3198c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn int rc = 0; 320d0aeccebe2d1539a9f0b5f19beb6c272a60d3cc6Dianne Hackborn 321d0aeccebe2d1539a9f0b5f19beb6c272a60d3cc6Dianne Hackborn#if defined(HAVE_PTHREADS) 3228c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn int lasterr = 0; 3238c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn 3247b0d45c3465304ccdd29ad20f43270ffd5a6aec0Dianne Hackborn pthread_once(&gDoSchedulingGroupOnce, checkDoSchedulingGroup); 3257b0d45c3465304ccdd29ad20f43270ffd5a6aec0Dianne Hackborn if (gDoSchedulingGroup) { 3267b0d45c3465304ccdd29ad20f43270ffd5a6aec0Dianne Hackborn if (pri >= ANDROID_PRIORITY_BACKGROUND) { 3277b0d45c3465304ccdd29ad20f43270ffd5a6aec0Dianne Hackborn rc = set_sched_policy(tid, SP_BACKGROUND); 3287b0d45c3465304ccdd29ad20f43270ffd5a6aec0Dianne Hackborn } else if (getpriority(PRIO_PROCESS, tid) >= ANDROID_PRIORITY_BACKGROUND) { 3297b0d45c3465304ccdd29ad20f43270ffd5a6aec0Dianne Hackborn rc = set_sched_policy(tid, SP_FOREGROUND); 3307b0d45c3465304ccdd29ad20f43270ffd5a6aec0Dianne Hackborn } 3318c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn } 3328c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn 3338c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn if (rc) { 3348c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn lasterr = errno; 3358c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn } 3368c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn 3378c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn if (setpriority(PRIO_PROCESS, tid, pri) < 0) { 3388c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn rc = INVALID_OPERATION; 3398c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn } else { 3408c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn errno = lasterr; 3418c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn } 342c5b138995e68910cfa95f88f12a1c69a102aa997Dianne Hackborn#endif 3438c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn 3448c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn return rc; 3458c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn} 3468c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn 347edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectnamespace android { 348edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 349edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project/* 350edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * =========================================================================== 351edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * Mutex class 352edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * =========================================================================== 353edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project */ 354edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 355ec0f1f6720cd7ecffab54b0dfc2553b55a38e50fMathias Agopian#if defined(HAVE_PTHREADS) 356ec0f1f6720cd7ecffab54b0dfc2553b55a38e50fMathias Agopian// implemented as inlines in threads.h 357edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#elif defined(HAVE_WIN32_THREADS) 358edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 359edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source ProjectMutex::Mutex() 360edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 361edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project HANDLE hMutex; 362edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 363edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project assert(sizeof(hMutex) == sizeof(mState)); 364edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 365edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project hMutex = CreateMutex(NULL, FALSE, NULL); 366edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project mState = (void*) hMutex; 367edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 368edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 369edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source ProjectMutex::Mutex(const char* name) 370edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 371edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // XXX: name not used for now 372edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project HANDLE hMutex; 373edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 374429db150affcc99b198fa0da52165fde4cd4cc7cDavid 'Digit' Turner assert(sizeof(hMutex) == sizeof(mState)); 375429db150affcc99b198fa0da52165fde4cd4cc7cDavid 'Digit' Turner 376429db150affcc99b198fa0da52165fde4cd4cc7cDavid 'Digit' Turner hMutex = CreateMutex(NULL, FALSE, NULL); 377429db150affcc99b198fa0da52165fde4cd4cc7cDavid 'Digit' Turner mState = (void*) hMutex; 378429db150affcc99b198fa0da52165fde4cd4cc7cDavid 'Digit' Turner} 379429db150affcc99b198fa0da52165fde4cd4cc7cDavid 'Digit' Turner 380429db150affcc99b198fa0da52165fde4cd4cc7cDavid 'Digit' TurnerMutex::Mutex(int type, const char* name) 381429db150affcc99b198fa0da52165fde4cd4cc7cDavid 'Digit' Turner{ 382429db150affcc99b198fa0da52165fde4cd4cc7cDavid 'Digit' Turner // XXX: type and name not used for now 383429db150affcc99b198fa0da52165fde4cd4cc7cDavid 'Digit' Turner HANDLE hMutex; 384429db150affcc99b198fa0da52165fde4cd4cc7cDavid 'Digit' Turner 385429db150affcc99b198fa0da52165fde4cd4cc7cDavid 'Digit' Turner assert(sizeof(hMutex) == sizeof(mState)); 386429db150affcc99b198fa0da52165fde4cd4cc7cDavid 'Digit' Turner 387edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project hMutex = CreateMutex(NULL, FALSE, NULL); 388edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project mState = (void*) hMutex; 389edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 390edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 391edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source ProjectMutex::~Mutex() 392edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 393edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project CloseHandle((HANDLE) mState); 394edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 395edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 396edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectstatus_t Mutex::lock() 397edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 398edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project DWORD dwWaitResult; 399edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project dwWaitResult = WaitForSingleObject((HANDLE) mState, INFINITE); 400edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return dwWaitResult != WAIT_OBJECT_0 ? -1 : NO_ERROR; 401edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 402edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 403edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectvoid Mutex::unlock() 404edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 405edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (!ReleaseMutex((HANDLE) mState)) 406edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project LOG(LOG_WARN, "thread", "WARNING: bad result from unlocking mutex\n"); 407edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 408edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 409edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectstatus_t Mutex::tryLock() 410edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 411edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project DWORD dwWaitResult; 412edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 413edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project dwWaitResult = WaitForSingleObject((HANDLE) mState, 0); 414edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (dwWaitResult != WAIT_OBJECT_0 && dwWaitResult != WAIT_TIMEOUT) 415edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project LOG(LOG_WARN, "thread", "WARNING: bad result from try-locking mutex\n"); 416edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return (dwWaitResult == WAIT_OBJECT_0) ? 0 : -1; 417edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 418edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 419edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#else 420edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#error "Somebody forgot to implement threads for this platform." 421edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#endif 422edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 423edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 424edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project/* 425edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * =========================================================================== 426edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * Condition class 427edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * =========================================================================== 428edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project */ 429edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 430ec0f1f6720cd7ecffab54b0dfc2553b55a38e50fMathias Agopian#if defined(HAVE_PTHREADS) 431ec0f1f6720cd7ecffab54b0dfc2553b55a38e50fMathias Agopian// implemented as inlines in threads.h 432edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#elif defined(HAVE_WIN32_THREADS) 433edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 434edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project/* 435edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * Windows doesn't have a condition variable solution. It's possible 436edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * to create one, but it's easy to get it wrong. For a discussion, and 437edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * the origin of this implementation, see: 438edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * 439edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * http://www.cs.wustl.edu/~schmidt/win32-cv-1.html 440edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * 441edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * The implementation shown on the page does NOT follow POSIX semantics. 442edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * As an optimization they require acquiring the external mutex before 443edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * calling signal() and broadcast(), whereas POSIX only requires grabbing 444edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * it before calling wait(). The implementation here has been un-optimized 445edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * to have the correct behavior. 446edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project */ 447edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projecttypedef struct WinCondition { 448edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Number of waiting threads. 449edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project int waitersCount; 450edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 451edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Serialize access to waitersCount. 452edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project CRITICAL_SECTION waitersCountLock; 453edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 454edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Semaphore used to queue up threads waiting for the condition to 455edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // become signaled. 456edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project HANDLE sema; 457edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 458edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // An auto-reset event used by the broadcast/signal thread to wait 459edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // for all the waiting thread(s) to wake up and be released from 460edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // the semaphore. 461edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project HANDLE waitersDone; 462edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 463edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // This mutex wouldn't be necessary if we required that the caller 464edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // lock the external mutex before calling signal() and broadcast(). 465edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // I'm trying to mimic pthread semantics though. 466edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project HANDLE internalMutex; 467edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 468edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Keeps track of whether we were broadcasting or signaling. This 469edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // allows us to optimize the code if we're just signaling. 470edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project bool wasBroadcast; 471edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 472edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project status_t wait(WinCondition* condState, HANDLE hMutex, nsecs_t* abstime) 473edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project { 474edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Increment the wait count, avoiding race conditions. 475edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project EnterCriticalSection(&condState->waitersCountLock); 476edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project condState->waitersCount++; 477edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project //printf("+++ wait: incr waitersCount to %d (tid=%ld)\n", 478edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // condState->waitersCount, getThreadId()); 479edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project LeaveCriticalSection(&condState->waitersCountLock); 480edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 481edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project DWORD timeout = INFINITE; 482edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (abstime) { 483edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project nsecs_t reltime = *abstime - systemTime(); 484edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (reltime < 0) 485edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project reltime = 0; 486edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project timeout = reltime/1000000; 487edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 488edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 489edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Atomically release the external mutex and wait on the semaphore. 490edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project DWORD res = 491edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project SignalObjectAndWait(hMutex, condState->sema, timeout, FALSE); 492edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 493edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project //printf("+++ wait: awake (tid=%ld)\n", getThreadId()); 494edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 495edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Reacquire lock to avoid race conditions. 496edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project EnterCriticalSection(&condState->waitersCountLock); 497edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 498edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // No longer waiting. 499edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project condState->waitersCount--; 500edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 501edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Check to see if we're the last waiter after a broadcast. 502edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project bool lastWaiter = (condState->wasBroadcast && condState->waitersCount == 0); 503edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 504edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project //printf("+++ wait: lastWaiter=%d (wasBc=%d wc=%d)\n", 505edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // lastWaiter, condState->wasBroadcast, condState->waitersCount); 506edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 507edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project LeaveCriticalSection(&condState->waitersCountLock); 508edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 509edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // If we're the last waiter thread during this particular broadcast 510edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // then signal broadcast() that we're all awake. It'll drop the 511edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // internal mutex. 512edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (lastWaiter) { 513edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Atomically signal the "waitersDone" event and wait until we 514edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // can acquire the internal mutex. We want to do this in one step 515edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // because it ensures that everybody is in the mutex FIFO before 516edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // any thread has a chance to run. Without it, another thread 517edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // could wake up, do work, and hop back in ahead of us. 518edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project SignalObjectAndWait(condState->waitersDone, condState->internalMutex, 519edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project INFINITE, FALSE); 520edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } else { 521edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Grab the internal mutex. 522edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project WaitForSingleObject(condState->internalMutex, INFINITE); 523edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 524edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 525edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Release the internal and grab the external. 526edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project ReleaseMutex(condState->internalMutex); 527edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project WaitForSingleObject(hMutex, INFINITE); 528edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 529edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return res == WAIT_OBJECT_0 ? NO_ERROR : -1; 530edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 531edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} WinCondition; 532edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 533edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project/* 534edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * Constructor. Set up the WinCondition stuff. 535edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project */ 536edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source ProjectCondition::Condition() 537edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 538edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project WinCondition* condState = new WinCondition; 539edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 540edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project condState->waitersCount = 0; 541edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project condState->wasBroadcast = false; 542edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // semaphore: no security, initial value of 0 543edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project condState->sema = CreateSemaphore(NULL, 0, 0x7fffffff, NULL); 544edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project InitializeCriticalSection(&condState->waitersCountLock); 545edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // auto-reset event, not signaled initially 546edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project condState->waitersDone = CreateEvent(NULL, FALSE, FALSE, NULL); 547edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // used so we don't have to lock external mutex on signal/broadcast 548edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project condState->internalMutex = CreateMutex(NULL, FALSE, NULL); 549edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 550edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project mState = condState; 551edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 552edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 553edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project/* 554edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * Destructor. Free Windows resources as well as our allocated storage. 555edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project */ 556edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source ProjectCondition::~Condition() 557edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 558edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project WinCondition* condState = (WinCondition*) mState; 559edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (condState != NULL) { 560edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project CloseHandle(condState->sema); 561edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project CloseHandle(condState->waitersDone); 562edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project delete condState; 563edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 564edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 565edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 566edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 567edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectstatus_t Condition::wait(Mutex& mutex) 568edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 569edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project WinCondition* condState = (WinCondition*) mState; 570edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project HANDLE hMutex = (HANDLE) mutex.mState; 571edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 572edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return ((WinCondition*)mState)->wait(condState, hMutex, NULL); 573edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 574edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 575edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectstatus_t Condition::waitRelative(Mutex& mutex, nsecs_t reltime) 576edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 577429db150affcc99b198fa0da52165fde4cd4cc7cDavid 'Digit' Turner WinCondition* condState = (WinCondition*) mState; 578429db150affcc99b198fa0da52165fde4cd4cc7cDavid 'Digit' Turner HANDLE hMutex = (HANDLE) mutex.mState; 579429db150affcc99b198fa0da52165fde4cd4cc7cDavid 'Digit' Turner nsecs_t absTime = systemTime()+reltime; 580429db150affcc99b198fa0da52165fde4cd4cc7cDavid 'Digit' Turner 581429db150affcc99b198fa0da52165fde4cd4cc7cDavid 'Digit' Turner return ((WinCondition*)mState)->wait(condState, hMutex, &absTime); 582edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 583edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 584edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project/* 585edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * Signal the condition variable, allowing one thread to continue. 586edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project */ 587edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectvoid Condition::signal() 588edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 589edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project WinCondition* condState = (WinCondition*) mState; 590edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 591edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Lock the internal mutex. This ensures that we don't clash with 592edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // broadcast(). 593edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project WaitForSingleObject(condState->internalMutex, INFINITE); 594edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 595edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project EnterCriticalSection(&condState->waitersCountLock); 596edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project bool haveWaiters = (condState->waitersCount > 0); 597edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project LeaveCriticalSection(&condState->waitersCountLock); 598edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 599edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // If no waiters, then this is a no-op. Otherwise, knock the semaphore 600edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // down a notch. 601edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (haveWaiters) 602edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project ReleaseSemaphore(condState->sema, 1, 0); 603edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 604edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Release internal mutex. 605edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project ReleaseMutex(condState->internalMutex); 606edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 607edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 608edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project/* 609edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * Signal the condition variable, allowing all threads to continue. 610edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * 611edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * First we have to wake up all threads waiting on the semaphore, then 612edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * we wait until all of the threads have actually been woken before 613edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * releasing the internal mutex. This ensures that all threads are woken. 614edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project */ 615edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectvoid Condition::broadcast() 616edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 617edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project WinCondition* condState = (WinCondition*) mState; 618edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 619edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Lock the internal mutex. This keeps the guys we're waking up 620edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // from getting too far. 621edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project WaitForSingleObject(condState->internalMutex, INFINITE); 622edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 623edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project EnterCriticalSection(&condState->waitersCountLock); 624edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project bool haveWaiters = false; 625edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 626edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (condState->waitersCount > 0) { 627edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project haveWaiters = true; 628edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project condState->wasBroadcast = true; 629edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 630edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 631edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (haveWaiters) { 632edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Wake up all the waiters. 633edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project ReleaseSemaphore(condState->sema, condState->waitersCount, 0); 634edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 635edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project LeaveCriticalSection(&condState->waitersCountLock); 636edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 637edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Wait for all awakened threads to acquire the counting semaphore. 638edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // The last guy who was waiting sets this. 639edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project WaitForSingleObject(condState->waitersDone, INFINITE); 640edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 641edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Reset wasBroadcast. (No crit section needed because nobody 642edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // else can wake up to poke at it.) 643edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project condState->wasBroadcast = 0; 644edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } else { 645edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // nothing to do 646edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project LeaveCriticalSection(&condState->waitersCountLock); 647edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 648edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 649edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Release internal mutex. 650edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project ReleaseMutex(condState->internalMutex); 651edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 652edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 653edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#else 654edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#error "condition variables not supported on this platform" 655edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#endif 656edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 657edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project// ---------------------------------------------------------------------------- 658edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 659edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project/* 660edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * This is our thread object! 661edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project */ 662edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 663edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source ProjectThread::Thread(bool canCallJava) 664edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project : mCanCallJava(canCallJava), 665edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project mThread(thread_id_t(-1)), 666edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project mLock("Thread::mLock"), 667edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project mStatus(NO_ERROR), 668edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project mExitPending(false), mRunning(false) 669edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 670edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 671edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 672edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source ProjectThread::~Thread() 673edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 674edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 675edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 676edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectstatus_t Thread::readyToRun() 677edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 678edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return NO_ERROR; 679edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 680edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 681edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectstatus_t Thread::run(const char* name, int32_t priority, size_t stack) 682edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 683edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project Mutex::Autolock _l(mLock); 684edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 685edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (mRunning) { 686edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // thread already started 687edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return INVALID_OPERATION; 688edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 689edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 690edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // reset status and exitPending to their default value, so we can 691edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // try again after an error happened (either below, or in readyToRun()) 692edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project mStatus = NO_ERROR; 693edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project mExitPending = false; 694edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project mThread = thread_id_t(-1); 695edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 696edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // hold a strong reference on ourself 697edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project mHoldSelf = this; 698edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 6999adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project mRunning = true; 7009adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project 701edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project bool res; 702edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (mCanCallJava) { 703edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project res = createThreadEtc(_threadLoop, 704edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project this, name, priority, stack, &mThread); 705edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } else { 706edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project res = androidCreateRawThreadEtc(_threadLoop, 707edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project this, name, priority, stack, &mThread); 708edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 709edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 710edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (res == false) { 711edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project mStatus = UNKNOWN_ERROR; // something happened! 712edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project mRunning = false; 713edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project mThread = thread_id_t(-1); 7149adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project mHoldSelf.clear(); // "this" may have gone away after this. 7159adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project 7169adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project return UNKNOWN_ERROR; 717edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 718edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 7199adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project // Do not refer to mStatus here: The thread is already running (may, in fact 7209adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project // already have exited with a valid mStatus result). The NO_ERROR indication 7219adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project // here merely indicates successfully starting the thread and does not 7229adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project // imply successful termination/execution. 7239adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project return NO_ERROR; 724edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 725edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 726edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectint Thread::_threadLoop(void* user) 727edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 728edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project Thread* const self = static_cast<Thread*>(user); 729edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project sp<Thread> strong(self->mHoldSelf); 730edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project wp<Thread> weak(strong); 731edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project self->mHoldSelf.clear(); 732edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 7334de4ebf6a25b5cf1819809ffcedea331d79823e0Mathias Agopian#if HAVE_ANDROID_OS 7344de4ebf6a25b5cf1819809ffcedea331d79823e0Mathias Agopian // this is very useful for debugging with gdb 7354de4ebf6a25b5cf1819809ffcedea331d79823e0Mathias Agopian self->mTid = gettid(); 7364de4ebf6a25b5cf1819809ffcedea331d79823e0Mathias Agopian#endif 7374de4ebf6a25b5cf1819809ffcedea331d79823e0Mathias Agopian 7389adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project bool first = true; 739edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 740edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project do { 7419adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project bool result; 7429adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project if (first) { 7439adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project first = false; 7449adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project self->mStatus = self->readyToRun(); 7459adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project result = (self->mStatus == NO_ERROR); 7469adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project 7479adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project if (result && !self->mExitPending) { 7489adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project // Binder threads (and maybe others) rely on threadLoop 7499adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project // running at least once after a successful ::readyToRun() 7509adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project // (unless, of course, the thread has already been asked to exit 7519adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project // at that point). 7529adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project // This is because threads are essentially used like this: 7539adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project // (new ThreadSubclass())->run(); 7549adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project // The caller therefore does not retain a strong reference to 7559adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project // the thread and the thread would simply disappear after the 7569adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project // successful ::readyToRun() call instead of entering the 7579adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project // threadLoop at least once. 7589adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project result = self->threadLoop(); 7599adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project } 7609adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project } else { 7619adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project result = self->threadLoop(); 7629adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project } 7639adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project 764edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (result == false || self->mExitPending) { 765edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project self->mExitPending = true; 766edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project self->mLock.lock(); 767edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project self->mRunning = false; 7684de4ebf6a25b5cf1819809ffcedea331d79823e0Mathias Agopian self->mThreadExitedCondition.broadcast(); 769edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project self->mLock.unlock(); 770edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project break; 771edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 772edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 773edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Release our strong reference, to let a chance to the thread 774edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // to die a peaceful death. 775edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project strong.clear(); 7764de4ebf6a25b5cf1819809ffcedea331d79823e0Mathias Agopian // And immediately, re-acquire a strong reference for the next loop 777edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project strong = weak.promote(); 778edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } while(strong != 0); 779edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 780edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return 0; 781edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 782edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 783edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectvoid Thread::requestExit() 784edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 785edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project mExitPending = true; 786edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 787edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 788edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectstatus_t Thread::requestExitAndWait() 789edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 7909adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project if (mThread == getThreadId()) { 7919adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project LOGW( 7929adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project "Thread (this=%p): don't call waitForExit() from this " 7939adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project "Thread object's thread. It's a guaranteed deadlock!", 7949adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project this); 795edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 7969adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project return WOULD_BLOCK; 797edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 7989adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project 7999adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project requestExit(); 8009adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project 8019adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project Mutex::Autolock _l(mLock); 8029adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project while (mRunning == true) { 8039adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project mThreadExitedCondition.wait(mLock); 8049adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project } 8059adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project mExitPending = false; 8069adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project 807edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return mStatus; 808edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 809edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 810edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectbool Thread::exitPending() const 811edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 812edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return mExitPending; 813edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 814edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 815edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 816edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 817edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project}; // namespace android 818