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/*
* Copyright (C) 2007-2011 Xagasoft, All rights reserved.
*
* This file is part of the libbu++ library and is released under the
* terms of the license contained in the file LICENSE.
*/
#ifndef BU_MUTEX_H
#define BU_MUTEX_H
#include <pthread.h>
namespace Bu
{
/**
* Simple mutex wrapper. Currently this doesn't do anything extra for you
* except keep all of the functionality together in an OO sorta' way and
* keep you from having to worry about cleaning up your mutexes properly,
* or initing them.
*@ingroup Threading
*/
class Mutex
{
public:
/**
* Create an unlocked mutex.
*/
Mutex();
/**
* Destroy a mutex. This can only be done when a mutex is unlocked.
* Failure to unlock before destroying a mutex object could cause it to
* wait for the mutex to unlock, the odds of which are usually farily
* low at deconstruction time.
*/
~Mutex();
/**
* Lock the mutex. This causes all future calls to lock on this
* instance of mutex to block until the first thread that called mutex
* unlocks it. At that point the next thread that called lock will get
* a chance to go to work. Because of the nature of a mutex lock it is
* a very bad idea to do any kind of serious or rather time consuming
* computation within a locked section. This can cause thread-deadlock
* and your program may hang.
*/
int lock();
/**
* Unlock the mutex. This allows the next thread that asked for a lock
* to lock the mutex and continue with execution.
*/
int unlock();
/**
* Try to lock the mutex. This is the option to go with if you cannot
* avoid putting lengthy operations within a locked section. trylock
* will attempt to lock the mutex, if the mutex is already locked this
* function returns immediately with an error code.
*/
int trylock();
protected:
pthread_mutex_t mutex; /**< The internal mutex reference. */
};
}
#endif
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