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     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/gfx/skia/trunk/src/utils/SkThreadUtils_pthread_linux.cpp	Wed Dec 31 06:09:35 2014 +0100
     1.3 @@ -0,0 +1,46 @@
     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 +#ifndef _GNU_SOURCE
    1.12 +#define _GNU_SOURCE //for pthread_setaffinity_np
    1.13 +#endif
    1.14 +
    1.15 +#include "SkThreadUtils.h"
    1.16 +#include "SkThreadUtils_pthread.h"
    1.17 +
    1.18 +#include <pthread.h>
    1.19 +
    1.20 +static int nth_set_cpu(unsigned int n, cpu_set_t* cpuSet) {
    1.21 +    n %= CPU_COUNT(cpuSet);
    1.22 +    for (unsigned int setCpusSeen = 0, currentCpu = 0; true; ++currentCpu) {
    1.23 +        if (CPU_ISSET(currentCpu, cpuSet)) {
    1.24 +            ++setCpusSeen;
    1.25 +            if (setCpusSeen > n) {
    1.26 +                return currentCpu;
    1.27 +            }
    1.28 +        }
    1.29 +    }
    1.30 +}
    1.31 +
    1.32 +bool SkThread::setProcessorAffinity(unsigned int processor) {
    1.33 +    SkThread_PThreadData* pthreadData = static_cast<SkThread_PThreadData*>(fData);
    1.34 +    if (!pthreadData->fValidPThread) {
    1.35 +        return false;
    1.36 +    }
    1.37 +
    1.38 +    cpu_set_t parentCpuset;
    1.39 +    if (0 != pthread_getaffinity_np(pthread_self(), sizeof(cpu_set_t), &parentCpuset)) {
    1.40 +        return false;
    1.41 +    }
    1.42 +
    1.43 +    cpu_set_t cpuset;
    1.44 +    CPU_ZERO(&cpuset);
    1.45 +    CPU_SET(nth_set_cpu(processor, &parentCpuset), &cpuset);
    1.46 +    return 0 == pthread_setaffinity_np(pthreadData->fPThread,
    1.47 +                                       sizeof(cpu_set_t),
    1.48 +                                       &cpuset);
    1.49 +}