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comparison: gfx/skia/trunk/src/utils/SkThreadUtils_pthread.cpp
gfx/skia/trunk/src/utils/SkThreadUtils_pthread.cpp
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
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| -1:000000000000 | 0:56104aed37d8 |
|---|---|
| 1 /* | |
| 2 * Copyright 2012 Google Inc. | |
| 3 * | |
| 4 * Use of this source code is governed by a BSD-style license that can be | |
| 5 * found in the LICENSE file. | |
| 6 */ | |
| 7 | |
| 8 #include "SkTypes.h" | |
| 9 | |
| 10 #include "SkThreadUtils.h" | |
| 11 #include "SkThreadUtils_pthread.h" | |
| 12 | |
| 13 #include <pthread.h> | |
| 14 #include <signal.h> | |
| 15 | |
| 16 PThreadEvent::PThreadEvent() : fConditionFlag(false) { | |
| 17 pthread_cond_init(&fCondition, NULL); | |
| 18 pthread_mutex_init(&fConditionMutex, NULL); | |
| 19 } | |
| 20 PThreadEvent::~PThreadEvent() { | |
| 21 pthread_mutex_destroy(&fConditionMutex); | |
| 22 pthread_cond_destroy(&fCondition); | |
| 23 } | |
| 24 void PThreadEvent::trigger() { | |
| 25 pthread_mutex_lock(&fConditionMutex); | |
| 26 fConditionFlag = true; | |
| 27 pthread_cond_signal(&fCondition); | |
| 28 pthread_mutex_unlock(&fConditionMutex); | |
| 29 } | |
| 30 void PThreadEvent::wait() { | |
| 31 pthread_mutex_lock(&fConditionMutex); | |
| 32 while (!fConditionFlag) { | |
| 33 pthread_cond_wait(&fCondition, &fConditionMutex); | |
| 34 } | |
| 35 pthread_mutex_unlock(&fConditionMutex); | |
| 36 } | |
| 37 bool PThreadEvent::isTriggered() { | |
| 38 bool currentFlag; | |
| 39 pthread_mutex_lock(&fConditionMutex); | |
| 40 currentFlag = fConditionFlag; | |
| 41 pthread_mutex_unlock(&fConditionMutex); | |
| 42 return currentFlag; | |
| 43 } | |
| 44 | |
| 45 SkThread_PThreadData::SkThread_PThreadData(SkThread::entryPointProc entryPoint, void* data) | |
| 46 : fPThread() | |
| 47 , fValidPThread(false) | |
| 48 , fParam(data) | |
| 49 , fEntryPoint(entryPoint) | |
| 50 { | |
| 51 pthread_attr_init(&fAttr); | |
| 52 pthread_attr_setdetachstate(&fAttr, PTHREAD_CREATE_JOINABLE); | |
| 53 } | |
| 54 | |
| 55 SkThread_PThreadData::~SkThread_PThreadData() { | |
| 56 pthread_attr_destroy(&fAttr); | |
| 57 } | |
| 58 | |
| 59 static void* thread_start(void* arg) { | |
| 60 SkThread_PThreadData* pthreadData = static_cast<SkThread_PThreadData*>(arg); | |
| 61 // Wait for start signal | |
| 62 pthreadData->fStarted.wait(); | |
| 63 | |
| 64 // Call entry point only if thread was not canceled before starting. | |
| 65 if (!pthreadData->fCanceled.isTriggered()) { | |
| 66 pthreadData->fEntryPoint(pthreadData->fParam); | |
| 67 } | |
| 68 return NULL; | |
| 69 } | |
| 70 | |
| 71 SkThread::SkThread(entryPointProc entryPoint, void* data) { | |
| 72 SkThread_PThreadData* pthreadData = new SkThread_PThreadData(entryPoint, data); | |
| 73 fData = pthreadData; | |
| 74 | |
| 75 int ret = pthread_create(&(pthreadData->fPThread), | |
| 76 &(pthreadData->fAttr), | |
| 77 thread_start, | |
| 78 pthreadData); | |
| 79 | |
| 80 pthreadData->fValidPThread = (0 == ret); | |
| 81 } | |
| 82 | |
| 83 SkThread::~SkThread() { | |
| 84 if (fData != NULL) { | |
| 85 SkThread_PThreadData* pthreadData = static_cast<SkThread_PThreadData*>(fData); | |
| 86 // If created thread but start was never called, kill the thread. | |
| 87 if (pthreadData->fValidPThread && !pthreadData->fStarted.isTriggered()) { | |
| 88 pthreadData->fCanceled.trigger(); | |
| 89 if (this->start()) { | |
| 90 this->join(); | |
| 91 } | |
| 92 } | |
| 93 delete pthreadData; | |
| 94 } | |
| 95 } | |
| 96 | |
| 97 bool SkThread::start() { | |
| 98 SkThread_PThreadData* pthreadData = static_cast<SkThread_PThreadData*>(fData); | |
| 99 if (!pthreadData->fValidPThread) { | |
| 100 return false; | |
| 101 } | |
| 102 | |
| 103 if (pthreadData->fStarted.isTriggered()) { | |
| 104 return false; | |
| 105 } | |
| 106 pthreadData->fStarted.trigger(); | |
| 107 return true; | |
| 108 } | |
| 109 | |
| 110 void SkThread::join() { | |
| 111 SkThread_PThreadData* pthreadData = static_cast<SkThread_PThreadData*>(fData); | |
| 112 if (!pthreadData->fValidPThread || !pthreadData->fStarted.isTriggered()) { | |
| 113 return; | |
| 114 } | |
| 115 | |
| 116 pthread_join(pthreadData->fPThread, NULL); | |
| 117 } |
