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134 lines
4.3 KiB
C++
134 lines
4.3 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Corporation code.
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*
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* The Initial Developer of the Original Code is Mozilla Foundation.
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* Portions created by the Initial Developer are Copyright (C) 2011
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Bas Schouten <bschouten@mozilla.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef mozilla_CrossProcessMutex_h
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#define mozilla_CrossProcessMutex_h
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#include "base/process.h"
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#include "mozilla/Mutex.h"
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namespace IPC {
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template<typename T>
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struct ParamTraits;
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}
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//
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// Provides:
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//
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// - CrossProcessMutex, a non-recursive mutex that can be shared across processes
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// - CrossProcessMutexAutoLock, an RAII class for ensuring that Mutexes are
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// properly locked and unlocked
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//
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// Using CrossProcessMutexAutoLock/CrossProcessMutexAutoUnlock is MUCH
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// preferred to making bare calls to CrossProcessMutex.Lock and Unlock.
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//
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namespace mozilla {
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#ifdef XP_WIN
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typedef HANDLE CrossProcessMutexHandle;
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#else
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// Stub for other platforms. We can't use uintptr_t here since different
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// processes could disagree on its size.
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typedef uintptr_t CrossProcessMutexHandle;
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#endif
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class NS_COM_GLUE CrossProcessMutex
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{
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public:
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/**
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* CrossProcessMutex
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* @param name A name which can reference this lock (currently unused)
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**/
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CrossProcessMutex(const char* aName);
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/**
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* CrossProcessMutex
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* @param handle A handle of an existing cross process mutex that can be
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* opened.
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*/
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CrossProcessMutex(CrossProcessMutexHandle aHandle);
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/**
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* ~CrossProcessMutex
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**/
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~CrossProcessMutex();
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/**
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* Lock
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* This will lock the mutex. Any other thread in any other process that
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* has access to this mutex calling lock will block execution until the
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* initial caller of lock has made a call to Unlock.
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*
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* If the owning process is terminated unexpectedly the mutex will be
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* released.
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**/
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void Lock();
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/**
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* Unlock
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* This will unlock the mutex. A single thread currently waiting on a lock
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* call will resume execution and aquire ownership of the lock. No
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* guarantees are made as to the order in which waiting threads will resume
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* execution.
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**/
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void Unlock();
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/**
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* ShareToProcess
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* This function is called to generate a serializable structure that can
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* be sent to the specified process and opened on the other side.
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*
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* @returns A handle that can be shared to another process
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*/
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CrossProcessMutexHandle ShareToProcess(base::ProcessHandle aTarget);
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private:
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friend struct IPC::ParamTraits<CrossProcessMutex>;
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CrossProcessMutex();
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CrossProcessMutex(const CrossProcessMutex&);
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CrossProcessMutex &operator=(const CrossProcessMutex&);
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#ifdef XP_WIN
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HANDLE mMutex;
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#endif
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};
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typedef BaseAutoLock<CrossProcessMutex> CrossProcessMutexAutoLock;
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typedef BaseAutoUnlock<CrossProcessMutex> CrossProcessMutexAutoUnlock;
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}
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#endif
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