The Tor Browser / file diff

     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/gfx/skia/trunk/src/utils/SkThreadUtils_pthread.cpp	Wed Dec 31 06:09:35 2014 +0100
     1.3 @@ -0,0 +1,117 @@
     1.4 +/*
     1.5 + * Copyright 2012 Google Inc.
     1.6 + *
     1.7 + * Use of this source code is governed by a BSD-style license that can be
     1.8 + * found in the LICENSE file.
     1.9 + */
    1.10 +
    1.11 +#include "SkTypes.h"
    1.12 +
    1.13 +#include "SkThreadUtils.h"
    1.14 +#include "SkThreadUtils_pthread.h"
    1.15 +
    1.16 +#include <pthread.h>
    1.17 +#include <signal.h>
    1.18 +
    1.19 +PThreadEvent::PThreadEvent() : fConditionFlag(false) {
    1.20 +    pthread_cond_init(&fCondition, NULL);
    1.21 +    pthread_mutex_init(&fConditionMutex, NULL);
    1.22 +}
    1.23 +PThreadEvent::~PThreadEvent() {
    1.24 +    pthread_mutex_destroy(&fConditionMutex);
    1.25 +    pthread_cond_destroy(&fCondition);
    1.26 +}
    1.27 +void PThreadEvent::trigger() {
    1.28 +    pthread_mutex_lock(&fConditionMutex);
    1.29 +    fConditionFlag = true;
    1.30 +    pthread_cond_signal(&fCondition);
    1.31 +    pthread_mutex_unlock(&fConditionMutex);
    1.32 +}
    1.33 +void PThreadEvent::wait() {
    1.34 +    pthread_mutex_lock(&fConditionMutex);
    1.35 +    while (!fConditionFlag) {
    1.36 +        pthread_cond_wait(&fCondition, &fConditionMutex);
    1.37 +    }
    1.38 +    pthread_mutex_unlock(&fConditionMutex);
    1.39 +}
    1.40 +bool PThreadEvent::isTriggered() {
    1.41 +    bool currentFlag;
    1.42 +    pthread_mutex_lock(&fConditionMutex);
    1.43 +    currentFlag = fConditionFlag;
    1.44 +    pthread_mutex_unlock(&fConditionMutex);
    1.45 +    return currentFlag;
    1.46 +}
    1.47 +
    1.48 +SkThread_PThreadData::SkThread_PThreadData(SkThread::entryPointProc entryPoint, void* data)
    1.49 +    : fPThread()
    1.50 +    , fValidPThread(false)
    1.51 +    , fParam(data)
    1.52 +    , fEntryPoint(entryPoint)
    1.53 +{
    1.54 +    pthread_attr_init(&fAttr);
    1.55 +    pthread_attr_setdetachstate(&fAttr, PTHREAD_CREATE_JOINABLE);
    1.56 +}
    1.57 +
    1.58 +SkThread_PThreadData::~SkThread_PThreadData() {
    1.59 +    pthread_attr_destroy(&fAttr);
    1.60 +}
    1.61 +
    1.62 +static void* thread_start(void* arg) {
    1.63 +    SkThread_PThreadData* pthreadData = static_cast<SkThread_PThreadData*>(arg);
    1.64 +    // Wait for start signal
    1.65 +    pthreadData->fStarted.wait();
    1.66 +
    1.67 +    // Call entry point only if thread was not canceled before starting.
    1.68 +    if (!pthreadData->fCanceled.isTriggered()) {
    1.69 +        pthreadData->fEntryPoint(pthreadData->fParam);
    1.70 +    }
    1.71 +    return NULL;
    1.72 +}
    1.73 +
    1.74 +SkThread::SkThread(entryPointProc entryPoint, void* data) {
    1.75 +    SkThread_PThreadData* pthreadData = new SkThread_PThreadData(entryPoint, data);
    1.76 +    fData = pthreadData;
    1.77 +
    1.78 +    int ret = pthread_create(&(pthreadData->fPThread),
    1.79 +                             &(pthreadData->fAttr),
    1.80 +                             thread_start,
    1.81 +                             pthreadData);
    1.82 +
    1.83 +    pthreadData->fValidPThread = (0 == ret);
    1.84 +}
    1.85 +
    1.86 +SkThread::~SkThread() {
    1.87 +    if (fData != NULL) {
    1.88 +        SkThread_PThreadData* pthreadData = static_cast<SkThread_PThreadData*>(fData);
    1.89 +        // If created thread but start was never called, kill the thread.
    1.90 +        if (pthreadData->fValidPThread && !pthreadData->fStarted.isTriggered()) {
    1.91 +            pthreadData->fCanceled.trigger();
    1.92 +            if (this->start()) {
    1.93 +                this->join();
    1.94 +            }
    1.95 +        }
    1.96 +        delete pthreadData;
    1.97 +    }
    1.98 +}
    1.99 +
   1.100 +bool SkThread::start() {
   1.101 +    SkThread_PThreadData* pthreadData = static_cast<SkThread_PThreadData*>(fData);
   1.102 +    if (!pthreadData->fValidPThread) {
   1.103 +        return false;
   1.104 +    }
   1.105 +
   1.106 +    if (pthreadData->fStarted.isTriggered()) {
   1.107 +        return false;
   1.108 +    }
   1.109 +    pthreadData->fStarted.trigger();
   1.110 +    return true;
   1.111 +}
   1.112 +
   1.113 +void SkThread::join() {
   1.114 +    SkThread_PThreadData* pthreadData = static_cast<SkThread_PThreadData*>(fData);
   1.115 +    if (!pthreadData->fValidPThread || !pthreadData->fStarted.isTriggered()) {
   1.116 +        return;
   1.117 +    }
   1.118 +
   1.119 +    pthread_join(pthreadData->fPThread, NULL);
   1.120 +}