зеркало из https://github.com/mozilla/gecko-dev.git
113 строки
2.9 KiB
C++
113 строки
2.9 KiB
C++
/* -*- 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/. */
|
|
|
|
// A lock that can be acquired multiple times on the same thread.
|
|
|
|
#ifndef mozilla_RecursiveMutex_h
|
|
#define mozilla_RecursiveMutex_h
|
|
|
|
#include "mozilla/BlockingResourceBase.h"
|
|
|
|
#ifndef XP_WIN
|
|
# include <pthread.h>
|
|
#endif
|
|
|
|
namespace mozilla {
|
|
|
|
class RecursiveMutex : public BlockingResourceBase {
|
|
public:
|
|
explicit RecursiveMutex(const char* aName);
|
|
~RecursiveMutex();
|
|
|
|
#ifdef DEBUG
|
|
void Lock();
|
|
void Unlock();
|
|
#else
|
|
void Lock() { LockInternal(); }
|
|
void Unlock() { UnlockInternal(); }
|
|
#endif
|
|
|
|
#ifdef DEBUG
|
|
/**
|
|
* AssertCurrentThreadIn
|
|
**/
|
|
void AssertCurrentThreadIn();
|
|
/**
|
|
* AssertNotCurrentThreadIn
|
|
**/
|
|
void AssertNotCurrentThreadIn() {
|
|
// Not currently implemented. See bug 476536 for discussion.
|
|
}
|
|
#else
|
|
void AssertCurrentThreadIn() {}
|
|
void AssertNotCurrentThreadIn() {}
|
|
#endif
|
|
|
|
private:
|
|
RecursiveMutex() = delete;
|
|
RecursiveMutex(const RecursiveMutex&) = delete;
|
|
RecursiveMutex& operator=(const RecursiveMutex&) = delete;
|
|
|
|
void LockInternal();
|
|
void UnlockInternal();
|
|
|
|
#ifdef DEBUG
|
|
PRThread* mOwningThread;
|
|
size_t mEntryCount;
|
|
#endif
|
|
|
|
#if !defined(XP_WIN)
|
|
pthread_mutex_t mMutex;
|
|
#else
|
|
// We eschew including windows.h and using CRITICAL_SECTION here so that files
|
|
// including us don't also pull in windows.h. Just use a type that's big
|
|
// enough for CRITICAL_SECTION, and we'll fix it up later.
|
|
void* mMutex[6];
|
|
#endif
|
|
};
|
|
|
|
class MOZ_RAII RecursiveMutexAutoLock {
|
|
public:
|
|
explicit RecursiveMutexAutoLock(RecursiveMutex& aRecursiveMutex)
|
|
: mRecursiveMutex(&aRecursiveMutex) {
|
|
NS_ASSERTION(mRecursiveMutex, "null mutex");
|
|
mRecursiveMutex->Lock();
|
|
}
|
|
|
|
~RecursiveMutexAutoLock(void) { mRecursiveMutex->Unlock(); }
|
|
|
|
private:
|
|
RecursiveMutexAutoLock() = delete;
|
|
RecursiveMutexAutoLock(const RecursiveMutexAutoLock&) = delete;
|
|
RecursiveMutexAutoLock& operator=(const RecursiveMutexAutoLock&) = delete;
|
|
static void* operator new(size_t) noexcept(true);
|
|
|
|
mozilla::RecursiveMutex* mRecursiveMutex;
|
|
};
|
|
|
|
class MOZ_RAII RecursiveMutexAutoUnlock {
|
|
public:
|
|
explicit RecursiveMutexAutoUnlock(RecursiveMutex& aRecursiveMutex)
|
|
: mRecursiveMutex(&aRecursiveMutex) {
|
|
NS_ASSERTION(mRecursiveMutex, "null mutex");
|
|
mRecursiveMutex->Unlock();
|
|
}
|
|
|
|
~RecursiveMutexAutoUnlock(void) { mRecursiveMutex->Lock(); }
|
|
|
|
private:
|
|
RecursiveMutexAutoUnlock() = delete;
|
|
RecursiveMutexAutoUnlock(const RecursiveMutexAutoUnlock&) = delete;
|
|
RecursiveMutexAutoUnlock& operator=(const RecursiveMutexAutoUnlock&) = delete;
|
|
static void* operator new(size_t) noexcept(true);
|
|
|
|
mozilla::RecursiveMutex* mRecursiveMutex;
|
|
};
|
|
|
|
} // namespace mozilla
|
|
|
|
#endif // mozilla_RecursiveMutex_h
|