pegasus/src/Pegasus/Common/Mutex.h - diff

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Diff for /pegasus/src/Pegasus/Common/Mutex.h between version 1.7 and 1.17

version 1.7, 2006/09/22 18:58:22

version 1.17, 2008/12/01 17:49:53

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//%2006////////////////////////////////////////////////////////////////////////

//%LICENSE////////////////////////////////////////////////////////////////

// Licensed to The Open Group (TOG) under one or more contributor license

// Company, L.P.; IBM Corp.; The Open Group; Tivoli Systems.

// agreements. Refer to the OpenPegasusNOTICE.txt file distributed with

// this work for additional information regarding copyright ownership.

// IBM Corp.; EMC Corporation, The Open Group.

// Each contributor licenses this file to you under the OpenPegasus Open

// Source License; you may not use this file except in compliance with the

// IBM Corp.; EMC Corporation; VERITAS Software Corporation; The Open Group.

// License.

// EMC Corporation; VERITAS Software Corporation; The Open Group.

// Permission is hereby granted, free of charge, to any person obtaining a

// copy of this software and associated documentation files (the "Software"),

// EMC Corporation; Symantec Corporation; The Open Group.

// to deal in the Software without restriction, including without limitation

// the rights to use, copy, modify, merge, publish, distribute, sublicense,

// Permission is hereby granted, free of charge, to any person obtaining a copy

// and/or sell copies of the Software, and to permit persons to whom the

// of this software and associated documentation files (the "Software"), to

// Software is furnished to do so, subject to the following conditions:

// deal in the Software without restriction, including without limitation the

// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or

// The above copyright notice and this permission notice shall be included

// sell copies of the Software, and to permit persons to whom the Software is

// in all copies or substantial portions of the Software.

// furnished to do so, subject to the following conditions:

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

// THE ABOVE COPYRIGHT NOTICE AND THIS PERMISSION NOTICE SHALL BE INCLUDED IN

// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

// ALL COPIES OR SUBSTANTIAL PORTIONS OF THE SOFTWARE. THE SOFTWARE IS PROVIDED

// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.

// "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT

// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY

// LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR

// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,

// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT

// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE

// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN

// SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

// ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION

// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

//==============================================================================

//////////////////////////////////////////////////////////////////////////

//%/////////////////////////////////////////////////////////////////////////////

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#include <Pegasus/Common/Config.h>

#include <Pegasus/Common/Linkage.h>

#include <Pegasus/Common/IPCExceptions.h>

#include <Pegasus/Common/Magic.h>

#include <Pegasus/Common/Threads.h>

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void lock();

void try_lock();

/**

Attempts to lock the mutex without blocking.

@return A Boolean indicating whether the lock was acquired.

Boolean try_lock();

void timed_lock(Uint32 milliseconds);

/**

Attempts to lock the mutex within the specified time.

@param milliseconds The maximum time to block while attempting to

acquire the lock.

@return A Boolean indicating whether the lock was acquired.

Boolean timed_lock(Uint32 milliseconds);

void unlock();

#if defined(PEGASUS_OS_LINUX)

/**

This method must only be called after a fork() to reset the mutex

lock status in the new process. Any other use of this method is

unsafe.

void reinitialize();

#endif

private:

Mutex(const Mutex&);

Mutex& operator=(const Mutex&);

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//==============================================================================

// Use of this macro ensures that a static Mutex is not locked during a fork().

// Use of this macro ensures that a static Mutex is not locked across a fork().

#if defined(PEGASUS_HAVE_PTHREADS) && \

!defined(PEGASUS_OS_ZOS) && \

#if !defined(PEGASUS_HAVE_PTHREADS) || \

!defined(PEGASUS_OS_VMS)

defined(PEGASUS_OS_ZOS) || \

defined(PEGASUS_OS_VMS)

# define PEGASUS_FORK_SAFE_MUTEX(mutex)

#elif defined(PEGASUS_OS_LINUX)

# define PEGASUS_FORK_SAFE_MUTEX(mutex) \

class ForkSafeMutex ## mutex \

{ \

public: \

ForkSafeMutex ## mutex() \

{ \

pthread_atfork( \

0, \

_reinitializeMutex); \

} \

private: \

static void _reinitializeMutex() \

{ \

mutex.reinitialize(); \

} \

}; \

static ForkSafeMutex ## mutex __forkSafeMutex ## mutex;

#else

# define PEGASUS_FORK_SAFE_MUTEX(mutex) \

class ForkSafeMutex ## mutex \

{ \

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}; \

static ForkSafeMutex ## mutex __forkSafeMutex ## mutex;

#else

# define PEGASUS_FORK_SAFE_MUTEX(mutex)

#endif

PEGASUS_NAMESPACE_END

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