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133 lines
3.7 KiB
C++
133 lines
3.7 KiB
C++
//
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// NamedMutex.h
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//
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// $Id: //poco/svn/Foundation/include/Poco/NamedMutex.h#2 $
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//
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// Library: Foundation
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// Package: Processes
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// Module: NamedMutex
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//
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// Definition of the NamedMutex class.
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//
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// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// Permission is hereby granted, free of charge, to any person or organization
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// obtaining a copy of the software and accompanying documentation covered by
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// this license (the "Software") to use, reproduce, display, distribute,
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// execute, and transmit the Software, and to prepare derivative works of the
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// Software, and to permit third-parties to whom the Software is furnished to
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// do so, all subject to the following:
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//
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// The copyright notices in the Software and this entire statement, including
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// the above license grant, this restriction and the following disclaimer,
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// must be included in all copies of the Software, in whole or in part, and
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// all derivative works of the Software, unless such copies or derivative
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// works are solely in the form of machine-executable object code generated by
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// a source language processor.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
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// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
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// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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//
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#ifndef Foundation_NamedMutex_INCLUDED
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#define Foundation_NamedMutex_INCLUDED
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#include "Poco/Foundation.h"
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#include "Poco/ScopedLock.h"
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#if defined(POCO_OS_FAMILY_WINDOWS) && defined(POCO_WIN32_UTF8)
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#include "Poco/NamedMutex_WIN32U.h"
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#elif defined(POCO_OS_FAMILY_WINDOWS)
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#include "Poco/NamedMutex_WIN32.h"
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#elif defined(POCO_OS_FAMILY_UNIX)
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#include "Poco/NamedMutex_UNIX.h"
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#else
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#include "Poco/NamedMutex_VMS.h"
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#endif
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namespace Poco {
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class Foundation_API NamedMutex: private NamedMutexImpl
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/// A NamedMutex (mutual exclusion) is a global synchronization
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/// mechanism used to control access to a shared resource
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/// in a concurrent (multi process) scenario.
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/// Using the ScopedLock class is the preferred way to automatically
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/// lock and unlock a mutex.
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///
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/// Unlike a Mutex or a FastMutex, which itself is the unit of synchronization,
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/// a NamedMutex refers to a named operating system resource being the
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/// unit of synchronization.
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/// In other words, there can be multiple instances of NamedMutex referring
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/// to the same actual synchronization object.
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///
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///
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/// There should not be more than one instance of NamedMutex for
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/// a given name in a process. Otherwise, the instances may
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/// interfere with each other.
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{
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public:
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typedef Poco::ScopedLock<NamedMutex> ScopedLock;
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NamedMutex(const std::string& name);
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/// creates the Mutex.
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~NamedMutex();
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/// destroys the Mutex.
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void lock();
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/// Locks the mutex. Blocks if the mutex
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/// is held by another process or thread.
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bool tryLock();
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/// Tries to lock the mutex. Returns false immediately
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/// if the mutex is already held by another process or thread.
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/// Returns true if the mutex was successfully locked.
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void unlock();
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/// Unlocks the mutex so that it can be acquired by
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/// other threads.
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private:
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NamedMutex();
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NamedMutex(const NamedMutex&);
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NamedMutex& operator = (const NamedMutex&);
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};
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//
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// inlines
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//
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inline void NamedMutex::lock()
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{
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lockImpl();
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}
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inline bool NamedMutex::tryLock()
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{
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return tryLockImpl();
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}
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inline void NamedMutex::unlock()
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{
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unlockImpl();
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}
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} // namespace Poco
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#endif // Foundation_NamedMutex_INCLUDED
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