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// This file is part of ff3d - http://www.freefem.org/ff3d
// Copyright (C) 2003 Pascal Hav
//
// 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, 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, write to the Free Software Foundation,
// Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
//
// $Id: Thread.hpp,v 1.1 2003/10/07 19:39:04 opkod Exp $
/**
* @file Thread.hpp
* @author Pascal Have
* @date Tue Oct 7 21:35:03 2003
*
* @brief Thread, Semaphore and Mutex classes
*
*
*/
#ifndef THREAD_HPP
#define THREAD_HPP
#include <cassert>
#include <pthread.h>
#include <semaphore.h>
//! Virtual Runnable Function
/*! Used as template independent virtual class */
class Runnable {
public:
//! Destructor
virtual ~Runnable() { }
//! Run function
virtual void run() = 0;
//! Exit function
virtual void clean() { }
};
extern "C" {
//! C function called when cleaning a thread
inline void clean_function(void * t) {
reinterpret_cast<Runnable *>(t)->clean();
}
//! C function called for starting a thread class
inline void * thread_function(void * t) {
Runnable *f = reinterpret_cast<Runnable *>(t);
assert(f != NULL);
pthread_cleanup_push(clean_function,f);
f->run(); // Appel par virtual
pthread_cleanup_pop(0);
delete f; // destruction de l'argument forcment dynamique
pthread_exit(NULL);
}
}
//! Thread Proxy class
template<typename T>
class ThreadFunction : public Runnable {
protected:
T & _t;
public:
ThreadFunction(T * const t) : _t(*t) { }
virtual ~ThreadFunction() { }
inline void run() { _t.run(); }
inline void clean() { _t.clean(); }
};
//! Main Thread class
class Thread : public Runnable {
protected:
pthread_t thread;
public:
Thread() { }
virtual ~Thread() { join(); }
void start() {
#ifndef NDEBUG
const int ret =
#endif /* NDEBUG */
pthread_create(&thread,NULL,
thread_function,
new ThreadFunction<Thread>(this));
assert(ret == 0);
}
void cancel() const {
pthread_cancel(thread);
}
static inline void cancellable(const bool b) {
pthread_setcancelstate((b)?PTHREAD_CANCEL_ENABLE:PTHREAD_CANCEL_DISABLE
,NULL);
}
static inline void cancellable() {
pthread_testcancel();
}
inline void join() const {
void * ret;
pthread_join(thread,&ret);
}
inline unsigned getId() const {
return thread;
}
};
class Mutex {
protected:
pthread_mutex_t mutex;
public:
Mutex() {
pthread_mutex_init(&mutex,NULL);
}
~Mutex() {
pthread_mutex_destroy(&mutex);
}
inline void lock() {
pthread_mutex_lock(&mutex);
}
inline void unlock() {
pthread_mutex_unlock(&mutex);
}
inline int trylock() {
return pthread_mutex_trylock(&mutex);
}
};
class Semaphore {
protected:
sem_t semaphore;
public:
Semaphore() {
sem_init(&semaphore,
0, // Interprocessus?
1 // Number of threads which can access simultaneously to the protected zone
);
}
~Semaphore() {
sem_destroy(&semaphore);
}
inline void wait() {
sem_wait(&semaphore);
}
inline void post() {
sem_post(&semaphore);
}
inline int trywait() {
return sem_trywait(&semaphore);
}
};
#endif /* THREAD_HPP */
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