bungeman@google.com | 5548752 | 2012-05-14 14:09:24 +0000 | [diff] [blame] | 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_win.h" |
| 12 | |
| 13 | SkThread_WinData::SkThread_WinData(SkThread::entryPointProc entryPoint, void* data) |
| 14 | : fHandle(NULL) |
| 15 | , fParam(data) |
| 16 | , fThreadId(0) |
| 17 | , fEntryPoint(entryPoint) |
| 18 | , fStarted(false) |
| 19 | { |
| 20 | fCancelEvent = CreateEvent( |
| 21 | NULL, // default security attributes |
| 22 | false, //auto reset |
| 23 | false, //not signaled |
| 24 | NULL); //no name |
| 25 | } |
| 26 | |
| 27 | SkThread_WinData::~SkThread_WinData() { |
| 28 | CloseHandle(fCancelEvent); |
| 29 | } |
| 30 | |
| 31 | static DWORD WINAPI thread_start(LPVOID data) { |
| 32 | SkThread_WinData* winData = static_cast<SkThread_WinData*>(data); |
| 33 | |
| 34 | //See if this thread was canceled before starting. |
| 35 | if (WaitForSingleObject(winData->fCancelEvent, 0) == WAIT_OBJECT_0) { |
| 36 | return 0; |
| 37 | } |
| 38 | |
| 39 | winData->fEntryPoint(winData->fParam); |
| 40 | return 0; |
| 41 | } |
| 42 | |
| 43 | SkThread::SkThread(entryPointProc entryPoint, void* data) { |
| 44 | SkThread_WinData* winData = new SkThread_WinData(entryPoint, data); |
| 45 | fData = winData; |
| 46 | |
| 47 | if (NULL == winData->fCancelEvent) { |
| 48 | return; |
| 49 | } |
| 50 | |
| 51 | winData->fHandle = CreateThread( |
| 52 | NULL, // default security attributes |
| 53 | 0, // use default stack size |
| 54 | thread_start, // thread function name (proxy) |
| 55 | winData, // argument to thread function (proxy args) |
| 56 | CREATE_SUSPENDED, // create suspended so affinity can be set |
| 57 | &winData->fThreadId); // returns the thread identifier |
| 58 | } |
| 59 | |
| 60 | SkThread::~SkThread() { |
| 61 | if (fData != NULL) { |
| 62 | SkThread_WinData* winData = static_cast<SkThread_WinData*>(fData); |
| 63 | // If created thread but start was never called, kill the thread. |
| 64 | if (winData->fHandle != NULL && !winData->fStarted) { |
| 65 | if (SetEvent(winData->fCancelEvent) != 0) { |
| 66 | if (this->start()) { |
| 67 | this->join(); |
| 68 | } |
| 69 | } else { |
| 70 | //kill with prejudice |
| 71 | TerminateThread(winData->fHandle, -1); |
| 72 | } |
| 73 | } |
| 74 | delete winData; |
| 75 | } |
| 76 | } |
| 77 | |
| 78 | bool SkThread::start() { |
| 79 | SkThread_WinData* winData = static_cast<SkThread_WinData*>(fData); |
| 80 | if (NULL == winData->fHandle) { |
| 81 | return false; |
| 82 | } |
| 83 | |
| 84 | if (winData->fStarted) { |
| 85 | return false; |
| 86 | } |
| 87 | winData->fStarted = -1 != ResumeThread(winData->fHandle); |
| 88 | return winData->fStarted; |
| 89 | } |
| 90 | |
| 91 | void SkThread::join() { |
| 92 | SkThread_WinData* winData = static_cast<SkThread_WinData*>(fData); |
| 93 | if (NULL == winData->fHandle || !winData->fStarted) { |
| 94 | return; |
| 95 | } |
| 96 | |
| 97 | WaitForSingleObject(winData->fHandle, INFINITE); |
| 98 | } |
| 99 | |
| 100 | static unsigned int num_bits_set(DWORD_PTR mask) { |
| 101 | unsigned int count; |
| 102 | for (count = 0; mask; ++count) { |
| 103 | mask &= mask - 1; |
| 104 | } |
| 105 | return count; |
| 106 | } |
| 107 | |
| 108 | static unsigned int nth_set_bit(unsigned int n, DWORD_PTR mask) { |
| 109 | n %= num_bits_set(mask); |
| 110 | for (unsigned int setBitsSeen = 0, currentBit = 0; true; ++currentBit) { |
bungeman@google.com | 4b18f57 | 2013-07-22 15:21:23 +0000 | [diff] [blame^] | 111 | if (mask & (static_cast<DWORD_PTR>(1) << currentBit)) { |
bungeman@google.com | 5548752 | 2012-05-14 14:09:24 +0000 | [diff] [blame] | 112 | ++setBitsSeen; |
| 113 | if (setBitsSeen > n) { |
| 114 | return currentBit; |
| 115 | } |
| 116 | } |
| 117 | } |
| 118 | } |
| 119 | |
| 120 | bool SkThread::setProcessorAffinity(unsigned int processor) { |
| 121 | SkThread_WinData* winData = static_cast<SkThread_WinData*>(fData); |
| 122 | if (NULL == winData->fHandle) { |
| 123 | return false; |
| 124 | } |
| 125 | |
| 126 | DWORD_PTR processAffinityMask; |
| 127 | DWORD_PTR systemAffinityMask; |
| 128 | if (0 == GetProcessAffinityMask(GetCurrentProcess(), |
| 129 | &processAffinityMask, |
| 130 | &systemAffinityMask)) { |
| 131 | return false; |
| 132 | } |
| 133 | |
| 134 | DWORD_PTR threadAffinityMask = 1 << nth_set_bit(processor, processAffinityMask); |
| 135 | return 0 != SetThreadAffinityMask(winData->fHandle, threadAffinityMask); |
| 136 | } |