Threads.cpp revision 8c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1
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> 248c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn 25edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#include <stdio.h> 26edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#include <stdlib.h> 27edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#include <memory.h> 28edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#include <errno.h> 29edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#include <assert.h> 30edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#include <unistd.h> 31edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 32edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#if defined(HAVE_PTHREADS) 33edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project# include <pthread.h> 34edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project# include <sched.h> 35edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project# include <sys/resource.h> 36edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#elif defined(HAVE_WIN32_THREADS) 37edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project# include <windows.h> 38edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project# include <stdint.h> 39edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project# include <process.h> 40edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project# define HAVE_CREATETHREAD // Cygwin, vs. HAVE__BEGINTHREADEX for MinGW 41edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#endif 42edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 43edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#if defined(HAVE_PRCTL) 44edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#include <sys/prctl.h> 45edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#endif 46edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 47edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project/* 48edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * =========================================================================== 49edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * Thread wrappers 50edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * =========================================================================== 51edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project */ 52edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 53edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectusing namespace android; 54edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 55edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project// ---------------------------------------------------------------------------- 56edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#if defined(HAVE_PTHREADS) 57edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project// ---------------------------------------------------------------------------- 58edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 59edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project/* 60edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * Create and run a new thead. 61edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * 62edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * We create it "detached", so it cleans up after itself. 63edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project */ 64edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 65edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projecttypedef void* (*android_pthread_entry)(void*); 66edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 67edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectstruct thread_data_t { 68edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project thread_func_t entryFunction; 69edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project void* userData; 70edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project int priority; 71edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project char * threadName; 72edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 73edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // we use this trampoline when we need to set the priority with 74edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // nice/setpriority. 75edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project static int trampoline(const thread_data_t* t) { 76edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project thread_func_t f = t->entryFunction; 77edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project void* u = t->userData; 78edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project int prio = t->priority; 79edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project char * name = t->threadName; 80edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project delete t; 81edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project setpriority(PRIO_PROCESS, 0, prio); 82edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (name) { 83edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#if defined(HAVE_PRCTL) 84edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Mac OS doesn't have this, and we build libutil for the host too 85edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project int hasAt = 0; 86edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project int hasDot = 0; 87edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project char *s = name; 88edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project while (*s) { 89edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (*s == '.') hasDot = 1; 90edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project else if (*s == '@') hasAt = 1; 91edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project s++; 92edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 93edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project int len = s - name; 94edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (len < 15 || hasAt || !hasDot) { 95edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project s = name; 96edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } else { 97edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project s = name + len - 15; 98edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 99edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project prctl(PR_SET_NAME, (unsigned long) s, 0, 0, 0); 100edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#endif 101edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project free(name); 102edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 103edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return f(u); 104edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 105edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project}; 106edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 107edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectint androidCreateRawThreadEtc(android_thread_func_t entryFunction, 108edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project void *userData, 109edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project const char* threadName, 110edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project int32_t threadPriority, 111edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project size_t threadStackSize, 112edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project android_thread_id_t *threadId) 113edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 114edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project pthread_attr_t attr; 115edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project pthread_attr_init(&attr); 116edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); 117edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 118edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#ifdef HAVE_ANDROID_OS /* valgrind is rejecting RT-priority create reqs */ 119edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (threadPriority != PRIORITY_DEFAULT || threadName != NULL) { 120edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // We could avoid the trampoline if there was a way to get to the 121edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // android_thread_id_t (pid) from pthread_t 122edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project thread_data_t* t = new thread_data_t; 123edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project t->priority = threadPriority; 124edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project t->threadName = threadName ? strdup(threadName) : NULL; 125edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project t->entryFunction = entryFunction; 126edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project t->userData = userData; 127edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project entryFunction = (android_thread_func_t)&thread_data_t::trampoline; 128edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project userData = t; 129edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 130edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#endif 131edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 132edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (threadStackSize) { 133edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project pthread_attr_setstacksize(&attr, threadStackSize); 134edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 135edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 136edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project errno = 0; 137edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project pthread_t thread; 138edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project int result = pthread_create(&thread, &attr, 139edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project (android_pthread_entry)entryFunction, userData); 140edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (result != 0) { 141edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project LOGE("androidCreateRawThreadEtc failed (entry=%p, res=%d, errno=%d)\n" 142edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project "(android threadPriority=%d)", 143edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project entryFunction, result, errno, threadPriority); 144edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return 0; 145edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 146edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 147edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (threadId != NULL) { 148edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project *threadId = (android_thread_id_t)thread; // XXX: this is not portable 149edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 150edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return 1; 151edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 152edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 153edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectandroid_thread_id_t androidGetThreadId() 154edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 155edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return (android_thread_id_t)pthread_self(); 156edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 157edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 158edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project// ---------------------------------------------------------------------------- 159edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#elif defined(HAVE_WIN32_THREADS) 160edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project// ---------------------------------------------------------------------------- 161edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 162edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project/* 163edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * Trampoline to make us __stdcall-compliant. 164edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * 165edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * We're expected to delete "vDetails" when we're done. 166edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project */ 167edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectstruct threadDetails { 168edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project int (*func)(void*); 169edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project void* arg; 170edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project}; 171edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectstatic __stdcall unsigned int threadIntermediary(void* vDetails) 172edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 173edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project struct threadDetails* pDetails = (struct threadDetails*) vDetails; 174edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project int result; 175edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 176edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project result = (*(pDetails->func))(pDetails->arg); 177edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 178edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project delete pDetails; 179edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 180edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project LOG(LOG_VERBOSE, "thread", "thread exiting\n"); 181edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return (unsigned int) result; 182edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 183edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 184edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project/* 185edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * Create and run a new thread. 186edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project */ 187edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectstatic bool doCreateThread(android_thread_func_t fn, void* arg, android_thread_id_t *id) 188edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 189edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project HANDLE hThread; 190edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project struct threadDetails* pDetails = new threadDetails; // must be on heap 191edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project unsigned int thrdaddr; 192edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 193edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project pDetails->func = fn; 194edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project pDetails->arg = arg; 195edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 196edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#if defined(HAVE__BEGINTHREADEX) 197edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project hThread = (HANDLE) _beginthreadex(NULL, 0, threadIntermediary, pDetails, 0, 198edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project &thrdaddr); 199edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (hThread == 0) 200edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#elif defined(HAVE_CREATETHREAD) 201edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project hThread = CreateThread(NULL, 0, 202edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project (LPTHREAD_START_ROUTINE) threadIntermediary, 203edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project (void*) pDetails, 0, (DWORD*) &thrdaddr); 204edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (hThread == NULL) 205edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#endif 206edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project { 207edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project LOG(LOG_WARN, "thread", "WARNING: thread create failed\n"); 208edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return false; 209edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 210edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 211edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#if defined(HAVE_CREATETHREAD) 212edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project /* close the management handle */ 213edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project CloseHandle(hThread); 214edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#endif 215edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 216edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (id != NULL) { 217edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project *id = (android_thread_id_t)thrdaddr; 218edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 219edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 220edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return true; 221edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 222edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 223edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectint androidCreateRawThreadEtc(android_thread_func_t fn, 224edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project void *userData, 225edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project const char* threadName, 226edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project int32_t threadPriority, 227edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project size_t threadStackSize, 228edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project android_thread_id_t *threadId) 229edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 230edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return doCreateThread( fn, userData, threadId); 231edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 232edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 233edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectandroid_thread_id_t androidGetThreadId() 234edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 235edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return (android_thread_id_t)GetCurrentThreadId(); 236edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 237edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 238edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project// ---------------------------------------------------------------------------- 239edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#else 240edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#error "Threads not supported" 241edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#endif 242edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 243edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project// ---------------------------------------------------------------------------- 244edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 245edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectint androidCreateThread(android_thread_func_t fn, void* arg) 246edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 247edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return createThreadEtc(fn, arg); 248edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 249edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 250edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectint androidCreateThreadGetID(android_thread_func_t fn, void *arg, android_thread_id_t *id) 251edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 252edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return createThreadEtc(fn, arg, "android:unnamed_thread", 253edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project PRIORITY_DEFAULT, 0, id); 254edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 255edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 256edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectstatic android_create_thread_fn gCreateThreadFn = androidCreateRawThreadEtc; 257edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 258edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectint androidCreateThreadEtc(android_thread_func_t entryFunction, 259edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project void *userData, 260edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project const char* threadName, 261edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project int32_t threadPriority, 262edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project size_t threadStackSize, 263edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project android_thread_id_t *threadId) 264edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 265edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return gCreateThreadFn(entryFunction, userData, threadName, 266edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project threadPriority, threadStackSize, threadId); 267edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 268edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 269edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectvoid androidSetCreateThreadFunc(android_create_thread_fn func) 270edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 271edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project gCreateThreadFn = func; 272edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 273edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 2748c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackbornpid_t androidGetTid() 2758c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn{ 2768c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn#ifdef HAVE_GETTID 2778c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn return gettid(); 2788c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn#else 2798c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn return getpid(); 2808c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn#endif 2818c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn} 2828c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn 2838c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackbornint androidSetThreadSchedulingGroup(pid_t tid, int grp) 2848c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn{ 2858c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn if (grp > ANDROID_TGROUP_MAX || grp < 0) { 2868c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn return BAD_VALUE; 2878c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn } 2888c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn 2898c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn if (set_sched_policy(tid, (grp == ANDROID_TGROUP_BG_NONINTERACT) ? 2908c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn SP_BACKGROUND : SP_FOREGROUND)) { 2918c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn return PERMISSION_DENIED; 2928c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn } 2938c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn 2948c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn return NO_ERROR; 2958c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn} 2968c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn 2978c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackbornint androidSetThreadPriority(pid_t tid, int pri) 2988c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn{ 2998c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn int rc = 0; 3008c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn int lasterr = 0; 3018c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn 3028c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn if (pri >= ANDROID_PRIORITY_BACKGROUND) { 3038c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn rc = set_sched_policy(tid, SP_BACKGROUND); 3048c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn } else if (getpriority(PRIO_PROCESS, tid) >= ANDROID_PRIORITY_BACKGROUND) { 3058c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn rc = set_sched_policy(tid, SP_FOREGROUND); 3068c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn } 3078c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn 3088c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn if (rc) { 3098c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn lasterr = errno; 3108c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn } 3118c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn 3128c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn if (setpriority(PRIO_PROCESS, tid, pri) < 0) { 3138c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn rc = INVALID_OPERATION; 3148c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn } else { 3158c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn errno = lasterr; 3168c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn } 3178c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn 3188c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn return rc; 3198c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn} 3208c6cedc9bc9a4b69616a79a95449f6f6b08c7bf1Dianne Hackborn 321edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectnamespace android { 322edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 323edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project/* 324edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * =========================================================================== 325edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * Mutex class 326edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * =========================================================================== 327edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project */ 328edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 329ec0f1f6720cd7ecffab54b0dfc2553b55a38e50fMathias Agopian#if defined(HAVE_PTHREADS) 330ec0f1f6720cd7ecffab54b0dfc2553b55a38e50fMathias Agopian// implemented as inlines in threads.h 331edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#elif defined(HAVE_WIN32_THREADS) 332edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 333edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source ProjectMutex::Mutex() 334edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 335edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project HANDLE hMutex; 336edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 337edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project assert(sizeof(hMutex) == sizeof(mState)); 338edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 339edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project hMutex = CreateMutex(NULL, FALSE, NULL); 340edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project mState = (void*) hMutex; 341edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 342edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 343edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source ProjectMutex::Mutex(const char* name) 344edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 345edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // XXX: name not used for now 346edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project HANDLE hMutex; 347edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 348429db150affcc99b198fa0da52165fde4cd4cc7cDavid 'Digit' Turner assert(sizeof(hMutex) == sizeof(mState)); 349429db150affcc99b198fa0da52165fde4cd4cc7cDavid 'Digit' Turner 350429db150affcc99b198fa0da52165fde4cd4cc7cDavid 'Digit' Turner hMutex = CreateMutex(NULL, FALSE, NULL); 351429db150affcc99b198fa0da52165fde4cd4cc7cDavid 'Digit' Turner mState = (void*) hMutex; 352429db150affcc99b198fa0da52165fde4cd4cc7cDavid 'Digit' Turner} 353429db150affcc99b198fa0da52165fde4cd4cc7cDavid 'Digit' Turner 354429db150affcc99b198fa0da52165fde4cd4cc7cDavid 'Digit' TurnerMutex::Mutex(int type, const char* name) 355429db150affcc99b198fa0da52165fde4cd4cc7cDavid 'Digit' Turner{ 356429db150affcc99b198fa0da52165fde4cd4cc7cDavid 'Digit' Turner // XXX: type and name not used for now 357429db150affcc99b198fa0da52165fde4cd4cc7cDavid 'Digit' Turner HANDLE hMutex; 358429db150affcc99b198fa0da52165fde4cd4cc7cDavid 'Digit' Turner 359429db150affcc99b198fa0da52165fde4cd4cc7cDavid 'Digit' Turner assert(sizeof(hMutex) == sizeof(mState)); 360429db150affcc99b198fa0da52165fde4cd4cc7cDavid 'Digit' Turner 361edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project hMutex = CreateMutex(NULL, FALSE, NULL); 362edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project mState = (void*) hMutex; 363edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 364edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 365edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source ProjectMutex::~Mutex() 366edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 367edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project CloseHandle((HANDLE) mState); 368edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 369edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 370edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectstatus_t Mutex::lock() 371edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 372edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project DWORD dwWaitResult; 373edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project dwWaitResult = WaitForSingleObject((HANDLE) mState, INFINITE); 374edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return dwWaitResult != WAIT_OBJECT_0 ? -1 : NO_ERROR; 375edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 376edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 377edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectvoid Mutex::unlock() 378edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 379edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (!ReleaseMutex((HANDLE) mState)) 380edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project LOG(LOG_WARN, "thread", "WARNING: bad result from unlocking mutex\n"); 381edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 382edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 383edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectstatus_t Mutex::tryLock() 384edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 385edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project DWORD dwWaitResult; 386edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 387edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project dwWaitResult = WaitForSingleObject((HANDLE) mState, 0); 388edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (dwWaitResult != WAIT_OBJECT_0 && dwWaitResult != WAIT_TIMEOUT) 389edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project LOG(LOG_WARN, "thread", "WARNING: bad result from try-locking mutex\n"); 390edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return (dwWaitResult == WAIT_OBJECT_0) ? 0 : -1; 391edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 392edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 393edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#else 394edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#error "Somebody forgot to implement threads for this platform." 395edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#endif 396edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 397edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 398edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project/* 399edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * =========================================================================== 400edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * Condition class 401edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * =========================================================================== 402edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project */ 403edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 404ec0f1f6720cd7ecffab54b0dfc2553b55a38e50fMathias Agopian#if defined(HAVE_PTHREADS) 405ec0f1f6720cd7ecffab54b0dfc2553b55a38e50fMathias Agopian// implemented as inlines in threads.h 406edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#elif defined(HAVE_WIN32_THREADS) 407edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 408edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project/* 409edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * Windows doesn't have a condition variable solution. It's possible 410edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * to create one, but it's easy to get it wrong. For a discussion, and 411edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * the origin of this implementation, see: 412edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * 413edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * http://www.cs.wustl.edu/~schmidt/win32-cv-1.html 414edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * 415edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * The implementation shown on the page does NOT follow POSIX semantics. 416edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * As an optimization they require acquiring the external mutex before 417edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * calling signal() and broadcast(), whereas POSIX only requires grabbing 418edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * it before calling wait(). The implementation here has been un-optimized 419edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * to have the correct behavior. 420edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project */ 421edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projecttypedef struct WinCondition { 422edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Number of waiting threads. 423edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project int waitersCount; 424edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 425edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Serialize access to waitersCount. 426edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project CRITICAL_SECTION waitersCountLock; 427edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 428edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Semaphore used to queue up threads waiting for the condition to 429edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // become signaled. 430edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project HANDLE sema; 431edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 432edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // An auto-reset event used by the broadcast/signal thread to wait 433edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // for all the waiting thread(s) to wake up and be released from 434edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // the semaphore. 435edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project HANDLE waitersDone; 436edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 437edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // This mutex wouldn't be necessary if we required that the caller 438edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // lock the external mutex before calling signal() and broadcast(). 439edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // I'm trying to mimic pthread semantics though. 440edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project HANDLE internalMutex; 441edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 442edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Keeps track of whether we were broadcasting or signaling. This 443edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // allows us to optimize the code if we're just signaling. 444edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project bool wasBroadcast; 445edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 446edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project status_t wait(WinCondition* condState, HANDLE hMutex, nsecs_t* abstime) 447edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project { 448edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Increment the wait count, avoiding race conditions. 449edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project EnterCriticalSection(&condState->waitersCountLock); 450edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project condState->waitersCount++; 451edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project //printf("+++ wait: incr waitersCount to %d (tid=%ld)\n", 452edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // condState->waitersCount, getThreadId()); 453edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project LeaveCriticalSection(&condState->waitersCountLock); 454edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 455edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project DWORD timeout = INFINITE; 456edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (abstime) { 457edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project nsecs_t reltime = *abstime - systemTime(); 458edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (reltime < 0) 459edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project reltime = 0; 460edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project timeout = reltime/1000000; 461edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 462edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 463edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Atomically release the external mutex and wait on the semaphore. 464edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project DWORD res = 465edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project SignalObjectAndWait(hMutex, condState->sema, timeout, FALSE); 466edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 467edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project //printf("+++ wait: awake (tid=%ld)\n", getThreadId()); 468edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 469edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Reacquire lock to avoid race conditions. 470edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project EnterCriticalSection(&condState->waitersCountLock); 471edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 472edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // No longer waiting. 473edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project condState->waitersCount--; 474edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 475edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Check to see if we're the last waiter after a broadcast. 476edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project bool lastWaiter = (condState->wasBroadcast && condState->waitersCount == 0); 477edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 478edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project //printf("+++ wait: lastWaiter=%d (wasBc=%d wc=%d)\n", 479edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // lastWaiter, condState->wasBroadcast, condState->waitersCount); 480edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 481edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project LeaveCriticalSection(&condState->waitersCountLock); 482edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 483edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // If we're the last waiter thread during this particular broadcast 484edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // then signal broadcast() that we're all awake. It'll drop the 485edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // internal mutex. 486edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (lastWaiter) { 487edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Atomically signal the "waitersDone" event and wait until we 488edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // can acquire the internal mutex. We want to do this in one step 489edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // because it ensures that everybody is in the mutex FIFO before 490edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // any thread has a chance to run. Without it, another thread 491edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // could wake up, do work, and hop back in ahead of us. 492edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project SignalObjectAndWait(condState->waitersDone, condState->internalMutex, 493edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project INFINITE, FALSE); 494edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } else { 495edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Grab the internal mutex. 496edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project WaitForSingleObject(condState->internalMutex, INFINITE); 497edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 498edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 499edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Release the internal and grab the external. 500edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project ReleaseMutex(condState->internalMutex); 501edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project WaitForSingleObject(hMutex, INFINITE); 502edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 503edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return res == WAIT_OBJECT_0 ? NO_ERROR : -1; 504edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 505edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} WinCondition; 506edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 507edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project/* 508edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * Constructor. Set up the WinCondition stuff. 509edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project */ 510edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source ProjectCondition::Condition() 511edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 512edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project WinCondition* condState = new WinCondition; 513edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 514edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project condState->waitersCount = 0; 515edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project condState->wasBroadcast = false; 516edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // semaphore: no security, initial value of 0 517edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project condState->sema = CreateSemaphore(NULL, 0, 0x7fffffff, NULL); 518edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project InitializeCriticalSection(&condState->waitersCountLock); 519edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // auto-reset event, not signaled initially 520edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project condState->waitersDone = CreateEvent(NULL, FALSE, FALSE, NULL); 521edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // used so we don't have to lock external mutex on signal/broadcast 522edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project condState->internalMutex = CreateMutex(NULL, FALSE, NULL); 523edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 524edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project mState = condState; 525edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 526edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 527edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project/* 528edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * Destructor. Free Windows resources as well as our allocated storage. 529edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project */ 530edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source ProjectCondition::~Condition() 531edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 532edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project WinCondition* condState = (WinCondition*) mState; 533edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (condState != NULL) { 534edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project CloseHandle(condState->sema); 535edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project CloseHandle(condState->waitersDone); 536edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project delete condState; 537edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 538edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 539edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 540edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 541edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectstatus_t Condition::wait(Mutex& mutex) 542edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 543edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project WinCondition* condState = (WinCondition*) mState; 544edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project HANDLE hMutex = (HANDLE) mutex.mState; 545edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 546edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return ((WinCondition*)mState)->wait(condState, hMutex, NULL); 547edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 548edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 549edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectstatus_t Condition::waitRelative(Mutex& mutex, nsecs_t reltime) 550edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 551429db150affcc99b198fa0da52165fde4cd4cc7cDavid 'Digit' Turner WinCondition* condState = (WinCondition*) mState; 552429db150affcc99b198fa0da52165fde4cd4cc7cDavid 'Digit' Turner HANDLE hMutex = (HANDLE) mutex.mState; 553429db150affcc99b198fa0da52165fde4cd4cc7cDavid 'Digit' Turner nsecs_t absTime = systemTime()+reltime; 554429db150affcc99b198fa0da52165fde4cd4cc7cDavid 'Digit' Turner 555429db150affcc99b198fa0da52165fde4cd4cc7cDavid 'Digit' Turner return ((WinCondition*)mState)->wait(condState, hMutex, &absTime); 556edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 557edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 558edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project/* 559edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * Signal the condition variable, allowing one thread to continue. 560edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project */ 561edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectvoid Condition::signal() 562edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 563edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project WinCondition* condState = (WinCondition*) mState; 564edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 565edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Lock the internal mutex. This ensures that we don't clash with 566edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // broadcast(). 567edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project WaitForSingleObject(condState->internalMutex, INFINITE); 568edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 569edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project EnterCriticalSection(&condState->waitersCountLock); 570edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project bool haveWaiters = (condState->waitersCount > 0); 571edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project LeaveCriticalSection(&condState->waitersCountLock); 572edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 573edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // If no waiters, then this is a no-op. Otherwise, knock the semaphore 574edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // down a notch. 575edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (haveWaiters) 576edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project ReleaseSemaphore(condState->sema, 1, 0); 577edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 578edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Release internal mutex. 579edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project ReleaseMutex(condState->internalMutex); 580edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 581edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 582edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project/* 583edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * Signal the condition variable, allowing all threads to continue. 584edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * 585edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * First we have to wake up all threads waiting on the semaphore, then 586edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * we wait until all of the threads have actually been woken before 587edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * releasing the internal mutex. This ensures that all threads are woken. 588edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project */ 589edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectvoid Condition::broadcast() 590edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 591edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project WinCondition* condState = (WinCondition*) mState; 592edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 593edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Lock the internal mutex. This keeps the guys we're waking up 594edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // from getting too far. 595edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project WaitForSingleObject(condState->internalMutex, INFINITE); 596edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 597edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project EnterCriticalSection(&condState->waitersCountLock); 598edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project bool haveWaiters = false; 599edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 600edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (condState->waitersCount > 0) { 601edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project haveWaiters = true; 602edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project condState->wasBroadcast = true; 603edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 604edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 605edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (haveWaiters) { 606edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Wake up all the waiters. 607edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project ReleaseSemaphore(condState->sema, condState->waitersCount, 0); 608edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 609edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project LeaveCriticalSection(&condState->waitersCountLock); 610edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 611edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Wait for all awakened threads to acquire the counting semaphore. 612edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // The last guy who was waiting sets this. 613edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project WaitForSingleObject(condState->waitersDone, INFINITE); 614edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 615edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Reset wasBroadcast. (No crit section needed because nobody 616edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // else can wake up to poke at it.) 617edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project condState->wasBroadcast = 0; 618edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } else { 619edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // nothing to do 620edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project LeaveCriticalSection(&condState->waitersCountLock); 621edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 622edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 623edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Release internal mutex. 624edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project ReleaseMutex(condState->internalMutex); 625edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 626edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 627edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#else 628edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#error "condition variables not supported on this platform" 629edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project#endif 630edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 631edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project// ---------------------------------------------------------------------------- 632edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 633edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project/* 634edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project * This is our thread object! 635edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project */ 636edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 637edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source ProjectThread::Thread(bool canCallJava) 638edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project : mCanCallJava(canCallJava), 639edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project mThread(thread_id_t(-1)), 640edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project mLock("Thread::mLock"), 641edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project mStatus(NO_ERROR), 642edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project mExitPending(false), mRunning(false) 643edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 644edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 645edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 646edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source ProjectThread::~Thread() 647edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 648edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 649edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 650edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectstatus_t Thread::readyToRun() 651edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 652edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return NO_ERROR; 653edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 654edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 655edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectstatus_t Thread::run(const char* name, int32_t priority, size_t stack) 656edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 657edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project Mutex::Autolock _l(mLock); 658edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 659edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (mRunning) { 660edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // thread already started 661edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return INVALID_OPERATION; 662edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 663edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 664edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // reset status and exitPending to their default value, so we can 665edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // try again after an error happened (either below, or in readyToRun()) 666edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project mStatus = NO_ERROR; 667edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project mExitPending = false; 668edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project mThread = thread_id_t(-1); 669edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 670edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // hold a strong reference on ourself 671edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project mHoldSelf = this; 672edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 6739adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project mRunning = true; 6749adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project 675edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project bool res; 676edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (mCanCallJava) { 677edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project res = createThreadEtc(_threadLoop, 678edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project this, name, priority, stack, &mThread); 679edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } else { 680edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project res = androidCreateRawThreadEtc(_threadLoop, 681edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project this, name, priority, stack, &mThread); 682edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 683edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 684edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (res == false) { 685edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project mStatus = UNKNOWN_ERROR; // something happened! 686edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project mRunning = false; 687edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project mThread = thread_id_t(-1); 6889adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project mHoldSelf.clear(); // "this" may have gone away after this. 6899adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project 6909adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project return UNKNOWN_ERROR; 691edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 692edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 6939adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project // Do not refer to mStatus here: The thread is already running (may, in fact 6949adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project // already have exited with a valid mStatus result). The NO_ERROR indication 6959adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project // here merely indicates successfully starting the thread and does not 6969adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project // imply successful termination/execution. 6979adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project return NO_ERROR; 698edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 699edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 700edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectint Thread::_threadLoop(void* user) 701edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 702edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project Thread* const self = static_cast<Thread*>(user); 703edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project sp<Thread> strong(self->mHoldSelf); 704edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project wp<Thread> weak(strong); 705edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project self->mHoldSelf.clear(); 706edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 7074de4ebf6a25b5cf1819809ffcedea331d79823e0Mathias Agopian#if HAVE_ANDROID_OS 7084de4ebf6a25b5cf1819809ffcedea331d79823e0Mathias Agopian // this is very useful for debugging with gdb 7094de4ebf6a25b5cf1819809ffcedea331d79823e0Mathias Agopian self->mTid = gettid(); 7104de4ebf6a25b5cf1819809ffcedea331d79823e0Mathias Agopian#endif 7114de4ebf6a25b5cf1819809ffcedea331d79823e0Mathias Agopian 7129adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project bool first = true; 713edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 714edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project do { 7159adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project bool result; 7169adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project if (first) { 7179adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project first = false; 7189adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project self->mStatus = self->readyToRun(); 7199adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project result = (self->mStatus == NO_ERROR); 7209adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project 7219adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project if (result && !self->mExitPending) { 7229adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project // Binder threads (and maybe others) rely on threadLoop 7239adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project // running at least once after a successful ::readyToRun() 7249adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project // (unless, of course, the thread has already been asked to exit 7259adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project // at that point). 7269adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project // This is because threads are essentially used like this: 7279adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project // (new ThreadSubclass())->run(); 7289adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project // The caller therefore does not retain a strong reference to 7299adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project // the thread and the thread would simply disappear after the 7309adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project // successful ::readyToRun() call instead of entering the 7319adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project // threadLoop at least once. 7329adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project result = self->threadLoop(); 7339adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project } 7349adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project } else { 7359adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project result = self->threadLoop(); 7369adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project } 7379adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project 738edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project if (result == false || self->mExitPending) { 739edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project self->mExitPending = true; 740edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project self->mLock.lock(); 741edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project self->mRunning = false; 7424de4ebf6a25b5cf1819809ffcedea331d79823e0Mathias Agopian self->mThreadExitedCondition.broadcast(); 743edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project self->mLock.unlock(); 744edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project break; 745edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 746edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 747edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // Release our strong reference, to let a chance to the thread 748edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project // to die a peaceful death. 749edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project strong.clear(); 7504de4ebf6a25b5cf1819809ffcedea331d79823e0Mathias Agopian // And immediately, re-acquire a strong reference for the next loop 751edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project strong = weak.promote(); 752edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } while(strong != 0); 753edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 754edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return 0; 755edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 756edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 757edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectvoid Thread::requestExit() 758edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 759edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project mExitPending = true; 760edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 761edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 762edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectstatus_t Thread::requestExitAndWait() 763edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 7649adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project if (mThread == getThreadId()) { 7659adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project LOGW( 7669adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project "Thread (this=%p): don't call waitForExit() from this " 7679adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project "Thread object's thread. It's a guaranteed deadlock!", 7689adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project this); 769edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 7709adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project return WOULD_BLOCK; 771edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project } 7729adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project 7739adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project requestExit(); 7749adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project 7759adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project Mutex::Autolock _l(mLock); 7769adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project while (mRunning == true) { 7779adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project mThreadExitedCondition.wait(mLock); 7789adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project } 7799adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project mExitPending = false; 7809adf84a4b6735354893ff1e57c129f66d97d75eeThe Android Open Source Project 781edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return mStatus; 782edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 783edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 784edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Projectbool Thread::exitPending() const 785edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project{ 786edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project return mExitPending; 787edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project} 788edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 789edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 790edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project 791edbf3b6af777b721cd2a1ef461947e51e88241e1The Android Open Source Project}; // namespace android 792