mirror of
https://github.com/pocoproject/poco.git
synced 2024-12-13 02:22:57 +01:00
133 lines
3.7 KiB
C++
133 lines
3.7 KiB
C++
//
|
|
// NamedMutex.h
|
|
//
|
|
// $Id: //poco/Main/Foundation/include/Poco/NamedMutex.h#3 $
|
|
//
|
|
// Library: Foundation
|
|
// Package: Processes
|
|
// Module: NamedMutex
|
|
//
|
|
// Definition of the NamedMutex class.
|
|
//
|
|
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
|
|
// and Contributors.
|
|
//
|
|
// Permission is hereby granted, free of charge, to any person or organization
|
|
// obtaining a copy of the software and accompanying documentation covered by
|
|
// this license (the "Software") to use, reproduce, display, distribute,
|
|
// execute, and transmit the Software, and to prepare derivative works of the
|
|
// Software, and to permit third-parties to whom the Software is furnished to
|
|
// do so, all subject to the following:
|
|
//
|
|
// The copyright notices in the Software and this entire statement, including
|
|
// the above license grant, this restriction and the following disclaimer,
|
|
// must be included in all copies of the Software, in whole or in part, and
|
|
// all derivative works of the Software, unless such copies or derivative
|
|
// works are solely in the form of machine-executable object code generated by
|
|
// a source language processor.
|
|
//
|
|
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
|
|
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
|
|
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
|
|
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
|
|
// DEALINGS IN THE SOFTWARE.
|
|
//
|
|
|
|
|
|
#ifndef Foundation_NamedMutex_INCLUDED
|
|
#define Foundation_NamedMutex_INCLUDED
|
|
|
|
|
|
#include "Poco/Foundation.h"
|
|
#include "Poco/ScopedLock.h"
|
|
|
|
|
|
#if defined(POCO_OS_FAMILY_WINDOWS) && defined(POCO_WIN32_UTF8)
|
|
#include "Poco/NamedMutex_WIN32U.h"
|
|
#elif defined(POCO_OS_FAMILY_WINDOWS)
|
|
#include "Poco/NamedMutex_WIN32.h"
|
|
#elif defined(POCO_OS_FAMILY_UNIX)
|
|
#include "Poco/NamedMutex_UNIX.h"
|
|
#else
|
|
#include "Poco/NamedMutex_VMS.h"
|
|
#endif
|
|
|
|
|
|
namespace Poco {
|
|
|
|
|
|
class Foundation_API NamedMutex: private NamedMutexImpl
|
|
/// A NamedMutex (mutual exclusion) is a global synchronization
|
|
/// mechanism used to control access to a shared resource
|
|
/// in a concurrent (multi process) scenario.
|
|
/// Using the ScopedLock class is the preferred way to automatically
|
|
/// lock and unlock a mutex.
|
|
///
|
|
/// Unlike a Mutex or a FastMutex, which itself is the unit of synchronization,
|
|
/// a NamedMutex refers to a named operating system resource being the
|
|
/// unit of synchronization.
|
|
/// In other words, there can be multiple instances of NamedMutex referring
|
|
/// to the same actual synchronization object.
|
|
///
|
|
///
|
|
/// There should not be more than one instance of NamedMutex for
|
|
/// a given name in a process. Otherwise, the instances may
|
|
/// interfere with each other.
|
|
{
|
|
public:
|
|
typedef Poco::ScopedLock<NamedMutex> ScopedLock;
|
|
|
|
NamedMutex(const std::string& name);
|
|
/// creates the Mutex.
|
|
|
|
~NamedMutex();
|
|
/// destroys the Mutex.
|
|
|
|
void lock();
|
|
/// Locks the mutex. Blocks if the mutex
|
|
/// is held by another process or thread.
|
|
|
|
bool tryLock();
|
|
/// Tries to lock the mutex. Returns false immediately
|
|
/// if the mutex is already held by another process or thread.
|
|
/// Returns true if the mutex was successfully locked.
|
|
|
|
void unlock();
|
|
/// Unlocks the mutex so that it can be acquired by
|
|
/// other threads.
|
|
|
|
private:
|
|
NamedMutex();
|
|
NamedMutex(const NamedMutex&);
|
|
NamedMutex& operator = (const NamedMutex&);
|
|
};
|
|
|
|
|
|
//
|
|
// inlines
|
|
//
|
|
inline void NamedMutex::lock()
|
|
{
|
|
lockImpl();
|
|
}
|
|
|
|
|
|
inline bool NamedMutex::tryLock()
|
|
{
|
|
return tryLockImpl();
|
|
}
|
|
|
|
|
|
inline void NamedMutex::unlock()
|
|
{
|
|
unlockImpl();
|
|
}
|
|
|
|
|
|
} // namespace Poco
|
|
|
|
|
|
#endif // Foundation_NamedMutex_INCLUDED
|