The Tor Browser: gfx/skia/trunk/src/utils/SkThreadUtils_pthread

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     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  */

     8 #ifndef _GNU_SOURCE

     9 #define _GNU_SOURCE //for pthread_setaffinity_np

    10 #endif

    12 #include "SkThreadUtils.h"

    13 #include "SkThreadUtils_pthread.h"

    15 #include <pthread.h>

    17 static int nth_set_cpu(unsigned int n, cpu_set_t* cpuSet) {

    18     n %= CPU_COUNT(cpuSet);

    19     for (unsigned int setCpusSeen = 0, currentCpu = 0; true; ++currentCpu) {

    20         if (CPU_ISSET(currentCpu, cpuSet)) {

    21             ++setCpusSeen;

    22             if (setCpusSeen > n) {

    23                 return currentCpu;

    24             }

    25         }

    26     }

    27 }

    29 bool SkThread::setProcessorAffinity(unsigned int processor) {

    30     SkThread_PThreadData* pthreadData = static_cast<SkThread_PThreadData*>(fData);

    31     if (!pthreadData->fValidPThread) {

    32         return false;

    33     }

    35     cpu_set_t parentCpuset;

    36     if (0 != pthread_getaffinity_np(pthread_self(), sizeof(cpu_set_t), &parentCpuset)) {

    37         return false;

    38     }

    40     cpu_set_t cpuset;

    41     CPU_ZERO(&cpuset);

    42     CPU_SET(nth_set_cpu(processor, &parentCpuset), &cpuset);

    43     return 0 == pthread_setaffinity_np(pthreadData->fPThread,

    44                                        sizeof(cpu_set_t),

    45                                        &cpuset);

    46 }

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