The Tor Browser / file comparison
comparison: gfx/skia/trunk/src/utils/SkThreadUtils_pthread_linux.cpp
gfx/skia/trunk/src/utils/SkThreadUtils_pthread_linux.cpp
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
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| -1:000000000000 | 0:96dafb3933c7 |
|---|---|
| 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 #ifndef _GNU_SOURCE | |
| 9 #define _GNU_SOURCE //for pthread_setaffinity_np | |
| 10 #endif | |
| 11 | |
| 12 #include "SkThreadUtils.h" | |
| 13 #include "SkThreadUtils_pthread.h" | |
| 14 | |
| 15 #include <pthread.h> | |
| 16 | |
| 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 } | |
| 28 | |
| 29 bool SkThread::setProcessorAffinity(unsigned int processor) { | |
| 30 SkThread_PThreadData* pthreadData = static_cast<SkThread_PThreadData*>(fData); | |
| 31 if (!pthreadData->fValidPThread) { | |
| 32 return false; | |
| 33 } | |
| 34 | |
| 35 cpu_set_t parentCpuset; | |
| 36 if (0 != pthread_getaffinity_np(pthread_self(), sizeof(cpu_set_t), &parentCpuset)) { | |
| 37 return false; | |
| 38 } | |
| 39 | |
| 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 } |
