mozglue/misc/RWLock_windows.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef XP_WIN
   8 #  error This file should only be compiled on Windows.
   9 #endif
  10
  11 #include "mozilla/PlatformRWLock.h"
  12
  13 #include <windows.h>
  14
  15 #define NativeHandle(m) (reinterpret_cast<SRWLOCK*>(&m))
  16
  17 mozilla::detail::RWLockImpl::RWLockImpl() {
  18   static_assert(sizeof(SRWLOCK) <= sizeof(mRWLock), "SRWLOCK is too big!");
  19   InitializeSRWLock(NativeHandle(mRWLock));
  20 }
  21
  22 mozilla::detail::RWLockImpl::~RWLockImpl() {}
  23
  24 bool mozilla::detail::RWLockImpl::tryReadLock() {
  25   return TryAcquireSRWLockShared(NativeHandle(mRWLock));
  26 }
  27
  28 void mozilla::detail::RWLockImpl::readLock() {
  29   AcquireSRWLockShared(NativeHandle(mRWLock));
  30 }
  31
  32 void mozilla::detail::RWLockImpl::readUnlock() {
  33   ReleaseSRWLockShared(NativeHandle(mRWLock));
  34 }
  35
  36 bool mozilla::detail::RWLockImpl::tryWriteLock() {
  37   return TryAcquireSRWLockExclusive(NativeHandle(mRWLock));
  38 }
  39
  40 void mozilla::detail::RWLockImpl::writeLock() {
  41   AcquireSRWLockExclusive(NativeHandle(mRWLock));
  42 }
  43
  44 void mozilla::detail::RWLockImpl::writeUnlock() {
  45   ReleaseSRWLockExclusive(NativeHandle(mRWLock));
  46 }
  47
  48 #undef NativeHandle