forked from mirrors/gecko-dev
119 lines
3.4 KiB
C++
119 lines
3.4 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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// A lock that can be acquired multiple times on the same thread.
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#ifndef mozilla_RecursiveMutex_h
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#define mozilla_RecursiveMutex_h
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#include "mozilla/ThreadSafety.h"
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#include "mozilla/BlockingResourceBase.h"
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#ifndef XP_WIN
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# include <pthread.h>
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#endif
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namespace mozilla {
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class MOZ_CAPABILITY RecursiveMutex : public BlockingResourceBase {
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public:
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explicit RecursiveMutex(const char* aName);
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~RecursiveMutex();
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#ifdef DEBUG
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void Lock() MOZ_CAPABILITY_ACQUIRE();
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void Unlock() MOZ_CAPABILITY_RELEASE();
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#else
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void Lock() MOZ_CAPABILITY_ACQUIRE() { LockInternal(); }
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void Unlock() MOZ_CAPABILITY_RELEASE() { UnlockInternal(); }
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#endif
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#ifdef DEBUG
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/**
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* AssertCurrentThreadIn
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**/
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void AssertCurrentThreadIn() const MOZ_ASSERT_CAPABILITY(this);
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/**
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* AssertNotCurrentThreadIn
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**/
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void AssertNotCurrentThreadIn() const MOZ_EXCLUDES(this) {
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// Not currently implemented. See bug 476536 for discussion.
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}
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#else
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void AssertCurrentThreadIn() const MOZ_ASSERT_CAPABILITY(this) {}
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void AssertNotCurrentThreadIn() const MOZ_EXCLUDES(this) {}
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#endif
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private:
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RecursiveMutex() = delete;
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RecursiveMutex(const RecursiveMutex&) = delete;
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RecursiveMutex& operator=(const RecursiveMutex&) = delete;
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void LockInternal();
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void UnlockInternal();
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#ifdef DEBUG
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PRThread* mOwningThread;
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size_t mEntryCount;
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#endif
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#if !defined(XP_WIN)
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pthread_mutex_t mMutex;
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#else
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// We eschew including windows.h and using CRITICAL_SECTION here so that files
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// including us don't also pull in windows.h. Just use a type that's big
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// enough for CRITICAL_SECTION, and we'll fix it up later.
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void* mMutex[6];
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#endif
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};
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class MOZ_RAII MOZ_SCOPED_CAPABILITY RecursiveMutexAutoLock {
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public:
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explicit RecursiveMutexAutoLock(RecursiveMutex& aRecursiveMutex)
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MOZ_CAPABILITY_ACQUIRE(aRecursiveMutex)
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: mRecursiveMutex(&aRecursiveMutex) {
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NS_ASSERTION(mRecursiveMutex, "null mutex");
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mRecursiveMutex->Lock();
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}
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~RecursiveMutexAutoLock(void) MOZ_CAPABILITY_RELEASE() {
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mRecursiveMutex->Unlock();
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}
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private:
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RecursiveMutexAutoLock() = delete;
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RecursiveMutexAutoLock(const RecursiveMutexAutoLock&) = delete;
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RecursiveMutexAutoLock& operator=(const RecursiveMutexAutoLock&) = delete;
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static void* operator new(size_t) noexcept(true);
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mozilla::RecursiveMutex* mRecursiveMutex;
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};
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class MOZ_RAII MOZ_SCOPED_CAPABILITY RecursiveMutexAutoUnlock {
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public:
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explicit RecursiveMutexAutoUnlock(RecursiveMutex& aRecursiveMutex)
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MOZ_SCOPED_UNLOCK_RELEASE(aRecursiveMutex)
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: mRecursiveMutex(&aRecursiveMutex) {
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NS_ASSERTION(mRecursiveMutex, "null mutex");
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mRecursiveMutex->Unlock();
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}
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~RecursiveMutexAutoUnlock(void) MOZ_SCOPED_UNLOCK_REACQUIRE() {
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mRecursiveMutex->Lock();
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}
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private:
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RecursiveMutexAutoUnlock() = delete;
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RecursiveMutexAutoUnlock(const RecursiveMutexAutoUnlock&) = delete;
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RecursiveMutexAutoUnlock& operator=(const RecursiveMutexAutoUnlock&) = delete;
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static void* operator new(size_t) noexcept(true);
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mozilla::RecursiveMutex* mRecursiveMutex;
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};
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} // namespace mozilla
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#endif // mozilla_RecursiveMutex_h
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