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/*
Copyright (C) 2005-2009 Michel de Boer <michel@twinklephone.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef _H_MUTEX
#define _H_MUTEX
#include <errno.h>
#include <pthread.h>
// #include <iostream>
/**
* @file
* Mutex operations
*/
class t_mutex {
protected:
pthread_mutex_t mutex;
public:
t_mutex();
// Throws a string exception (error message) when failing.
t_mutex(bool recursive);
virtual ~t_mutex();
// These methods throw a string exception when the operation
// fails.
virtual void lock(void);
// Returns:
// 0 - success
// EBUSY - already locked
// For other errors a string exception is thrown
virtual int trylock(void);
virtual void unlock(void);
};
class t_recursive_mutex : public t_mutex {
public:
t_recursive_mutex();
~t_recursive_mutex();
};
/**
* Guard pattern for a mutex .
* The constructor of a guard locks a mutex and the destructor
* unlocks it. This way a guard object can be created at entrance
* of a function. Then at exit, the mutex is automically unlocked
* as the guard object goes out of scope.
*/
class t_mutex_guard {
private:
/** The guarding mutex. */
t_mutex &mutex_;
public:
/**
* The constructor will lock the mutex.
* @param mutex [in] Mutex to lock.
*/
t_mutex_guard(t_mutex &mutex);
/**
* The destructor will unlock the mutex.
*/
~t_mutex_guard();
};
class t_rwmutex {
protected:
pthread_rwlock_t _lock;
public:
t_rwmutex();
~t_rwmutex();
void lockRead();
void lockWrite();
void unlock();
};
class t_rwmutex_reader {
private:
t_rwmutex& _mutex;
public:
t_rwmutex_reader(t_rwmutex& mutex) : _mutex(mutex) {
// std::cout << "mtx rd lock " << (void*)&_mutex << std::endl;
_mutex.lockRead();
}
~t_rwmutex_reader() {
// std::cout << "mtx rd unlock " << (void*)&_mutex << std::endl;
_mutex.unlock();
}
};
class t_rwmutex_writer {
private:
t_rwmutex& _mutex;
public:
t_rwmutex_writer(t_rwmutex& mutex) : _mutex(mutex) {
// std::cout << "mtx wr lock " << (void*)&_mutex << std::endl;
_mutex.lockWrite();
}
~t_rwmutex_writer() {
// std::cout << "mtx wr unlock " << (void*)&_mutex << std::endl;
_mutex.unlock();
}
};
#endif
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