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/*
* Copyright 2008 Free Software Foundation, Inc.
*
* This software is distributed under the terms of the GNU Public License.
* See the COPYING file in the main directory for details.
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 3 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 <http://www.gnu.org/licenses/>.
*/
#ifndef THREADS_H
#define THREADS_H
#include <pthread.h>
#include <iostream>
#include "Assert.h"
class Mutex;
/**@name Multithreaded access for standard streams. */
//@{
/**@name Functions for gStreamLock. */
//@{
extern Mutex gStreamLock; ///< global lock for cout and cerr
void lockCerr(); ///< call prior to writing cerr
void unlockCerr(); ///< call after writing cerr
void lockCout(); ///< call prior to writing cout
void unlockCout(); ///< call after writing cout
//@}
/**@name Macros for standard messages. */
//@{
#define COUT(text) { lockCout(); std::cout << text; unlockCout(); }
#define CERR(text) { lockCerr(); std::cerr << __FILE__ << ":" << __LINE__ << ": " << text; unlockCerr(); }
#ifdef NDEBUG
#define DCOUT(text) {}
#define OBJDCOUT(text) {}
#else
#define DCOUT(text) { COUT(__FILE__ << ":" << __LINE__ << " " << text); }
#define OBJDCOUT(text) { DCOUT(this << " " << text); }
#endif
//@}
//@}
/**@defgroup C++ wrappers for pthread mechanisms. */
//@{
/** A class for recursive mutexes based on pthread_mutex. */
class Mutex {
private:
pthread_mutex_t mMutex;
pthread_mutexattr_t mAttribs;
public:
Mutex();
~Mutex();
void lock() { pthread_mutex_lock(&mMutex); }
void unlock() { pthread_mutex_unlock(&mMutex); }
friend class Signal;
};
/** A C++ interthread signal based on pthread condition variables. */
class Signal {
private:
mutable pthread_cond_t mSignal;
public:
Signal() { assert(!pthread_cond_init(&mSignal,NULL)); }
~Signal() { pthread_cond_destroy(&mSignal); }
/** Block for the signal up to the cancellation timeout. */
void wait(Mutex& wMutex, unsigned timeout=1000000000) const;
void signal() { pthread_cond_signal(&mSignal); }
void broadcast() { pthread_cond_broadcast(&mSignal); }
};
#define START_THREAD(thread,function,argument) \
thread.start((void *(*)(void*))function, (void*)argument);
/** A C++ wrapper for pthread threads. */
class Thread {
private:
pthread_t mThread;
pthread_attr_t mAttrib;
const static size_t mStackSize=4*65536;
public:
/** Create a thread in a non-running state. */
Thread():mThread((pthread_t)0) { }
/**
Destroy the Thread.
It should be stopped and joined.
*/
~Thread() { assert(!pthread_attr_destroy(&mAttrib)); }
/** Start the thread on a task. */
void start(void *(*task)(void*), void *arg);
/** Join a thread that will stop on its own. */
void join() { assert(!pthread_join(mThread,NULL)); }
};
#endif
// vim: ts=4 sw=4
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