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https://github.com/mollyim/webrtc.git
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2b85792b01
This moves it from an API directory (system_wrappers/include/) to a non-API directory, which is exactly what we want for utilities like this. BUG=webrtc:8445 NOPRESUBMIT=true Change-Id: Ie2879aca5fc1667e4222499d2a8fc2bba9ae2425 Reviewed-on: https://webrtc-review.googlesource.com/21328 Commit-Queue: Karl Wiberg <kwiberg@webrtc.org> Reviewed-by: Danil Chapovalov <danilchap@webrtc.org> Cr-Commit-Position: refs/heads/master@{#22587}
95 lines
2.7 KiB
C++
95 lines
2.7 KiB
C++
/*
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* Copyright (c) 2012 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 "rtc_base/synchronization/rw_lock_win.h"
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#include "rtc_base/logging.h"
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namespace webrtc {
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static bool native_rw_locks_supported = false;
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static bool module_load_attempted = false;
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static HMODULE library = NULL;
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typedef void(WINAPI* InitializeSRWLock)(PSRWLOCK);
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typedef void(WINAPI* AcquireSRWLockExclusive)(PSRWLOCK);
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typedef void(WINAPI* ReleaseSRWLockExclusive)(PSRWLOCK);
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typedef void(WINAPI* AcquireSRWLockShared)(PSRWLOCK);
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typedef void(WINAPI* ReleaseSRWLockShared)(PSRWLOCK);
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InitializeSRWLock initialize_srw_lock;
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AcquireSRWLockExclusive acquire_srw_lock_exclusive;
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AcquireSRWLockShared acquire_srw_lock_shared;
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ReleaseSRWLockShared release_srw_lock_shared;
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ReleaseSRWLockExclusive release_srw_lock_exclusive;
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RWLockWin::RWLockWin() {
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initialize_srw_lock(&lock_);
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}
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RWLockWin* RWLockWin::Create() {
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if (!LoadModule()) {
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return NULL;
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}
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return new RWLockWin();
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}
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void RWLockWin::AcquireLockExclusive() {
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acquire_srw_lock_exclusive(&lock_);
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}
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void RWLockWin::ReleaseLockExclusive() {
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release_srw_lock_exclusive(&lock_);
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}
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void RWLockWin::AcquireLockShared() {
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acquire_srw_lock_shared(&lock_);
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}
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void RWLockWin::ReleaseLockShared() {
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release_srw_lock_shared(&lock_);
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}
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bool RWLockWin::LoadModule() {
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if (module_load_attempted) {
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return native_rw_locks_supported;
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}
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module_load_attempted = true;
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// Use native implementation if supported (i.e Vista+)
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library = LoadLibrary(TEXT("Kernel32.dll"));
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if (!library) {
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return false;
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}
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RTC_LOG(LS_VERBOSE) << "Loaded Kernel.dll";
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initialize_srw_lock =
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(InitializeSRWLock)GetProcAddress(library, "InitializeSRWLock");
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acquire_srw_lock_exclusive = (AcquireSRWLockExclusive)GetProcAddress(
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library, "AcquireSRWLockExclusive");
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release_srw_lock_exclusive = (ReleaseSRWLockExclusive)GetProcAddress(
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library, "ReleaseSRWLockExclusive");
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acquire_srw_lock_shared =
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(AcquireSRWLockShared)GetProcAddress(library, "AcquireSRWLockShared");
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release_srw_lock_shared =
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(ReleaseSRWLockShared)GetProcAddress(library, "ReleaseSRWLockShared");
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if (initialize_srw_lock && acquire_srw_lock_exclusive &&
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release_srw_lock_exclusive && acquire_srw_lock_shared &&
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release_srw_lock_shared) {
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RTC_LOG(LS_VERBOSE) << "Loaded Native RW Lock";
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native_rw_locks_supported = true;
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}
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return native_rw_locks_supported;
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}
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} // namespace webrtc
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