mirror of
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105 lines
3.8 KiB
C++
105 lines
3.8 KiB
C++
/*
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* Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "webrtc/system_wrappers/interface/trace.h"
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#include "webrtc/system_wrappers/source/condition_variable_native_win.h"
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#include "webrtc/system_wrappers/source/critical_section_win.h"
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namespace webrtc {
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static HMODULE library = NULL;
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static bool win_support_condition_variables_primitive = false;
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PInitializeConditionVariable PInitializeConditionVariable_;
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PSleepConditionVariableCS PSleepConditionVariableCS_;
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PWakeConditionVariable PWakeConditionVariable_;
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PWakeAllConditionVariable PWakeAllConditionVariable_;
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typedef void (WINAPI *PInitializeConditionVariable)(PCONDITION_VARIABLE);
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typedef BOOL (WINAPI *PSleepConditionVariableCS)(PCONDITION_VARIABLE,
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PCRITICAL_SECTION, DWORD);
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typedef void (WINAPI *PWakeConditionVariable)(PCONDITION_VARIABLE);
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typedef void (WINAPI *PWakeAllConditionVariable)(PCONDITION_VARIABLE);
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ConditionVariableNativeWin::ConditionVariableNativeWin() {
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}
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ConditionVariableNativeWin::~ConditionVariableNativeWin() {
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}
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ConditionVariableWrapper* ConditionVariableNativeWin::Create() {
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ConditionVariableNativeWin* ret_val = new ConditionVariableNativeWin();
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if (!ret_val->Init()) {
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delete ret_val;
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return NULL;
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}
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return ret_val;
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}
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bool ConditionVariableNativeWin::Init() {
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if (!library) {
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// Native implementation is supported on Vista+.
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library = LoadLibrary(TEXT("Kernel32.dll"));
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// TODO(henrike): this code results in an attempt to load the above dll
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// every time the previous attempt failed. Only try to load once.
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if (library) {
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// TODO(henrike): not thread safe as reading and writing to library is not
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// serialized. Fix.
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WEBRTC_TRACE(kTraceStateInfo, kTraceUtility, -1, "Loaded Kernel.dll");
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PInitializeConditionVariable_ =
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(PInitializeConditionVariable) GetProcAddress(
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library, "InitializeConditionVariable");
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PSleepConditionVariableCS_ = (PSleepConditionVariableCS) GetProcAddress(
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library, "SleepConditionVariableCS");
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PWakeConditionVariable_ = (PWakeConditionVariable) GetProcAddress(
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library, "WakeConditionVariable");
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PWakeAllConditionVariable_ = (PWakeAllConditionVariable) GetProcAddress(
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library, "WakeAllConditionVariable");
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if (PInitializeConditionVariable_ && PSleepConditionVariableCS_
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&& PWakeConditionVariable_ && PWakeAllConditionVariable_) {
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WEBRTC_TRACE(
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kTraceStateInfo, kTraceUtility, -1,
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"Loaded native condition variables");
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win_support_condition_variables_primitive = true;
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}
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}
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}
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if (!win_support_condition_variables_primitive) {
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return false;
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}
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PInitializeConditionVariable_(&condition_variable_);
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return true;
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}
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void ConditionVariableNativeWin::SleepCS(CriticalSectionWrapper& crit_sect) {
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SleepCS(crit_sect, INFINITE);
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}
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bool ConditionVariableNativeWin::SleepCS(CriticalSectionWrapper& crit_sect,
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unsigned long max_time_in_ms) {
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CriticalSectionWindows* cs =
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static_cast<CriticalSectionWindows*>(&crit_sect);
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BOOL ret_val = PSleepConditionVariableCS_(&condition_variable_,
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&(cs->crit), max_time_in_ms);
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return ret_val != 0;
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}
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void ConditionVariableNativeWin::Wake() {
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PWakeConditionVariable_(&condition_variable_);
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}
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void ConditionVariableNativeWin::WakeAll() {
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PWakeAllConditionVariable_(&condition_variable_);
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}
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} // namespace webrtc
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