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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "mozilla/RWLock.h"
#ifdef XP_WIN
# include <windows.h>
static_assert(sizeof(SRWLOCK) <= sizeof(void*), "SRWLOCK is too big!");
# define NativeHandle(m) (reinterpret_cast<SRWLOCK*>(&m))
#else
# define NativeHandle(m) (&m)
#endif
namespace mozilla {
RWLock::RWLock(const char* aName)
: BlockingResourceBase(aName, eMutex)
#ifdef DEBUG
,
mOwningThread(nullptr)
#endif
{
#ifdef XP_WIN
InitializeSRWLock(NativeHandle(mRWLock));
#else
MOZ_RELEASE_ASSERT(pthread_rwlock_init(NativeHandle(mRWLock), nullptr) == 0,
"pthread_rwlock_init failed");
#endif
}
#ifdef DEBUG
bool RWLock::LockedForWritingByCurrentThread() {
return mOwningThread == PR_GetCurrentThread();
}
#endif
#ifndef XP_WIN
RWLock::~RWLock() {
MOZ_RELEASE_ASSERT(pthread_rwlock_destroy(NativeHandle(mRWLock)) == 0,
"pthread_rwlock_destroy failed");
}
#endif
void RWLock::ReadLockInternal() {
#ifdef XP_WIN
AcquireSRWLockShared(NativeHandle(mRWLock));
#else
MOZ_RELEASE_ASSERT(pthread_rwlock_rdlock(NativeHandle(mRWLock)) == 0,
"pthread_rwlock_rdlock failed");
#endif
}
void RWLock::ReadUnlockInternal() {
#ifdef XP_WIN
ReleaseSRWLockShared(NativeHandle(mRWLock));
#else
MOZ_RELEASE_ASSERT(pthread_rwlock_unlock(NativeHandle(mRWLock)) == 0,
"pthread_rwlock_unlock failed");
#endif
}
void RWLock::WriteLockInternal() {
#ifdef XP_WIN
AcquireSRWLockExclusive(NativeHandle(mRWLock));
#else
MOZ_RELEASE_ASSERT(pthread_rwlock_wrlock(NativeHandle(mRWLock)) == 0,
"pthread_rwlock_wrlock failed");
#endif
}
void RWLock::WriteUnlockInternal() {
#ifdef XP_WIN
ReleaseSRWLockExclusive(NativeHandle(mRWLock));
#else
MOZ_RELEASE_ASSERT(pthread_rwlock_unlock(NativeHandle(mRWLock)) == 0,
"pthread_rwlock_unlock failed");
#endif
}
} // namespace mozilla
#undef NativeHandle
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