mirror of
https://github.com/mollyim/webrtc.git
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ce1b140b8d
Windows UWP allows an application to be built that targets across all Windows 10 based systems and the Windows store. Change-Id: I69694bb7e83fb01ad6db2438b065b55738cf01fd Bug: webrtc:10046 Reviewed-on: https://webrtc-review.googlesource.com/c/110570 Commit-Queue: Patrik Höglund <phoglund@webrtc.org> Reviewed-by: Karl Wiberg <kwiberg@webrtc.org> Reviewed-by: Patrik Höglund <phoglund@webrtc.org> Cr-Commit-Position: refs/heads/master@{#25814}
106 lines
3.3 KiB
C++
106 lines
3.3 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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typedef void(WINAPI* PInitializeSRWLock)(PSRWLOCK);
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typedef void(WINAPI* PAcquireSRWLockExclusive)(PSRWLOCK);
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typedef void(WINAPI* PReleaseSRWLockExclusive)(PSRWLOCK);
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typedef void(WINAPI* PAcquireSRWLockShared)(PSRWLOCK);
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typedef void(WINAPI* PReleaseSRWLockShared)(PSRWLOCK);
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PInitializeSRWLock initialize_srw_lock;
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PAcquireSRWLockExclusive acquire_srw_lock_exclusive;
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PAcquireSRWLockShared acquire_srw_lock_shared;
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PReleaseSRWLockShared release_srw_lock_shared;
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PReleaseSRWLockExclusive 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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static bool module_load_attempted = false;
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static bool native_rw_locks_supported = false;
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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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#if !defined(WINUWP)
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// Use native implementation if supported (i.e Vista+)
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static HMODULE 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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(PInitializeSRWLock)GetProcAddress(library, "InitializeSRWLock");
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acquire_srw_lock_exclusive = (PAcquireSRWLockExclusive)GetProcAddress(
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library, "AcquireSRWLockExclusive");
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release_srw_lock_exclusive = (PReleaseSRWLockExclusive)GetProcAddress(
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library, "ReleaseSRWLockExclusive");
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acquire_srw_lock_shared =
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(PAcquireSRWLockShared)GetProcAddress(library, "AcquireSRWLockShared");
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release_srw_lock_shared =
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(PReleaseSRWLockShared)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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#else
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// On WinUWP the symbols loaded from this library are directly present
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// in the headers and thus loading the library is not required (and
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// manually loading libraries is restricted due to WinUWP sandboxing).
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initialize_srw_lock = InitializeSRWLock;
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acquire_srw_lock_exclusive = AcquireSRWLockExclusive;
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release_srw_lock_exclusive = ReleaseSRWLockExclusive;
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acquire_srw_lock_shared = AcquireSRWLockShared;
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release_srw_lock_shared = ReleaseSRWLockShared;
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native_rw_locks_supported = true;
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#endif // !defined(WINUWP)
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return native_rw_locks_supported;
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}
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} // namespace webrtc
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