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| 1 /* | |
| 2 * Copyright (c) 2013 The WebRTC project authors. All Rights Reserved. | |
| 3 * | |
| 4 * Use of this source code is governed by a BSD-style license | |
| 5 * that can be found in the LICENSE file in the root of the source | |
| 6 * tree. An additional intellectual property rights grant can be found | |
| 7 * in the file PATENTS. All contributing project authors may | |
| 8 * be found in the AUTHORS file in the root of the source tree. | |
| 9 */ | |
| 10 | |
| 11 #include "webrtc/system_wrappers/include/critical_section_wrapper.h" | |
| 12 #include "webrtc/system_wrappers/include/trace.h" | |
| 13 #include "webrtc/system_wrappers/source/condition_variable_native_win.h" | |
| 14 | |
| 15 namespace webrtc { | |
| 16 | |
| 17 static HMODULE library = NULL; | |
| 18 static bool win_support_condition_variables_primitive = false; | |
| 19 | |
| 20 PInitializeConditionVariable PInitializeConditionVariable_; | |
| 21 PSleepConditionVariableCS PSleepConditionVariableCS_; | |
| 22 PWakeConditionVariable PWakeConditionVariable_; | |
| 23 PWakeAllConditionVariable PWakeAllConditionVariable_; | |
| 24 | |
| 25 typedef void (WINAPI *PInitializeConditionVariable)(PCONDITION_VARIABLE); | |
| 26 typedef BOOL (WINAPI *PSleepConditionVariableCS)(PCONDITION_VARIABLE, | |
| 27 PCRITICAL_SECTION, DWORD); | |
| 28 typedef void (WINAPI *PWakeConditionVariable)(PCONDITION_VARIABLE); | |
| 29 typedef void (WINAPI *PWakeAllConditionVariable)(PCONDITION_VARIABLE); | |
| 30 | |
| 31 ConditionVariableNativeWin::ConditionVariableNativeWin() { | |
| 32 } | |
| 33 | |
| 34 ConditionVariableNativeWin::~ConditionVariableNativeWin() { | |
| 35 } | |
| 36 | |
| 37 ConditionVariableWrapper* ConditionVariableNativeWin::Create() { | |
| 38 ConditionVariableNativeWin* ret_val = new ConditionVariableNativeWin(); | |
| 39 if (!ret_val->Init()) { | |
| 40 delete ret_val; | |
| 41 return NULL; | |
| 42 } | |
| 43 return ret_val; | |
| 44 } | |
| 45 | |
| 46 bool ConditionVariableNativeWin::Init() { | |
| 47 if (!library) { | |
| 48 // Native implementation is supported on Vista+. | |
| 49 library = LoadLibrary(TEXT("Kernel32.dll")); | |
| 50 // TODO(henrike): this code results in an attempt to load the above dll | |
| 51 // every time the previous attempt failed. Only try to load once. | |
| 52 if (library) { | |
| 53 // TODO(henrike): not thread safe as reading and writing to library is not | |
| 54 // serialized. Fix. | |
| 55 WEBRTC_TRACE(kTraceStateInfo, kTraceUtility, -1, "Loaded Kernel.dll"); | |
| 56 | |
| 57 PInitializeConditionVariable_ = | |
| 58 (PInitializeConditionVariable) GetProcAddress( | |
| 59 library, "InitializeConditionVariable"); | |
| 60 PSleepConditionVariableCS_ = (PSleepConditionVariableCS) GetProcAddress( | |
| 61 library, "SleepConditionVariableCS"); | |
| 62 PWakeConditionVariable_ = (PWakeConditionVariable) GetProcAddress( | |
| 63 library, "WakeConditionVariable"); | |
| 64 PWakeAllConditionVariable_ = (PWakeAllConditionVariable) GetProcAddress( | |
| 65 library, "WakeAllConditionVariable"); | |
| 66 | |
| 67 if (PInitializeConditionVariable_ && PSleepConditionVariableCS_ | |
| 68 && PWakeConditionVariable_ && PWakeAllConditionVariable_) { | |
| 69 WEBRTC_TRACE( | |
| 70 kTraceStateInfo, kTraceUtility, -1, | |
| 71 "Loaded native condition variables"); | |
| 72 win_support_condition_variables_primitive = true; | |
| 73 } | |
| 74 } | |
| 75 } | |
| 76 if (!win_support_condition_variables_primitive) { | |
| 77 return false; | |
| 78 } | |
| 79 PInitializeConditionVariable_(&condition_variable_); | |
| 80 return true; | |
| 81 } | |
| 82 | |
| 83 void ConditionVariableNativeWin::SleepCS(CriticalSectionWrapper& crit_sect) { | |
| 84 SleepCS(crit_sect, INFINITE); | |
| 85 } | |
| 86 | |
| 87 bool ConditionVariableNativeWin::SleepCS(CriticalSectionWrapper& crit_sect, | |
| 88 unsigned long max_time_in_ms) { | |
| 89 BOOL ret_val = PSleepConditionVariableCS_(&condition_variable_, | |
| 90 &crit_sect.crit_, max_time_in_ms); | |
| 91 return ret_val != 0; | |
| 92 } | |
| 93 | |
| 94 void ConditionVariableNativeWin::Wake() { | |
| 95 PWakeConditionVariable_(&condition_variable_); | |
| 96 } | |
| 97 | |
| 98 void ConditionVariableNativeWin::WakeAll() { | |
| 99 PWakeAllConditionVariable_(&condition_variable_); | |
| 100 } | |
| 101 | |
| 102 } // namespace webrtc | |
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Chromium Code Reviews
Issue 1601523009:
Remove ConditionVariableWrapper. (Closed)
Base URL: https://chromium.googlesource.com/external/webrtc.git@master