Line data    Source code

       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             : #include "mozilla/RWLock.h"
       8             : 
       9             : #ifdef XP_WIN
      10             : #include <windows.h>
      11             : 
      12             : static_assert(sizeof(SRWLOCK) <= sizeof(void*), "SRWLOCK is too big!");
      13             : 
      14             : #define NativeHandle(m) (reinterpret_cast<SRWLOCK*>(&m))
      15             : #else
      16             : #define NativeHandle(m) (&m)
      17             : #endif
      18             : 
      19             : namespace mozilla {
      20             : 
      21           0 : RWLock::RWLock(const char* aName)
      22             :   : BlockingResourceBase(aName, eMutex)
      23             : #ifdef DEBUG
      24           0 :   , mOwningThread(nullptr)
      25             : #endif
      26             : {
      27             : #ifdef XP_WIN
      28             :   InitializeSRWLock(NativeHandle(mRWLock));
      29             : #else
      30           0 :   MOZ_RELEASE_ASSERT(pthread_rwlock_init(NativeHandle(mRWLock), nullptr) == 0,
      31             :                      "pthread_rwlock_init failed");
      32             : #endif
      33           0 : }
      34             : 
      35             : #ifdef DEBUG
      36             : bool
      37           0 : RWLock::LockedForWritingByCurrentThread()
      38             : {
      39           0 :   return mOwningThread == PR_GetCurrentThread();
      40             : }
      41             : #endif
      42             : 
      43             : #ifndef XP_WIN
      44           0 : RWLock::~RWLock()
      45             : {
      46           0 :   MOZ_RELEASE_ASSERT(pthread_rwlock_destroy(NativeHandle(mRWLock)) == 0,
      47             :                      "pthread_rwlock_destroy failed");
      48           0 : }
      49             : #endif
      50             : 
      51             : void
      52           0 : RWLock::ReadLockInternal()
      53             : {
      54             : #ifdef XP_WIN
      55             :   AcquireSRWLockShared(NativeHandle(mRWLock));
      56             : #else
      57           0 :   MOZ_RELEASE_ASSERT(pthread_rwlock_rdlock(NativeHandle(mRWLock)) == 0,
      58             :                      "pthread_rwlock_rdlock failed");
      59             : #endif
      60           0 : }
      61             : 
      62             : void
      63           0 : RWLock::ReadUnlockInternal()
      64             : {
      65             : #ifdef XP_WIN
      66             :   ReleaseSRWLockShared(NativeHandle(mRWLock));
      67             : #else
      68           0 :   MOZ_RELEASE_ASSERT(pthread_rwlock_unlock(NativeHandle(mRWLock)) == 0,
      69             :                      "pthread_rwlock_unlock failed");
      70             : #endif
      71           0 : }
      72             : 
      73             : void
      74           0 : RWLock::WriteLockInternal()
      75             : {
      76             : #ifdef XP_WIN
      77             :   AcquireSRWLockExclusive(NativeHandle(mRWLock));
      78             : #else
      79           0 :   MOZ_RELEASE_ASSERT(pthread_rwlock_wrlock(NativeHandle(mRWLock)) == 0,
      80             :                      "pthread_rwlock_wrlock failed");
      81             : #endif
      82           0 : }
      83             : 
      84             : void
      85           0 : RWLock::WriteUnlockInternal()
      86             : {
      87             : #ifdef XP_WIN
      88             :   ReleaseSRWLockExclusive(NativeHandle(mRWLock));
      89             : #else
      90           0 :   MOZ_RELEASE_ASSERT(pthread_rwlock_unlock(NativeHandle(mRWLock)) == 0,
      91             :                      "pthread_rwlock_unlock failed");
      92             : #endif
      93           0 : }
      94             : 
      95             : }
      96             : 
      97             : #undef NativeHandle