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/*
* threads.h
*
* Definitions and shortcuts for POSIX threads.
*
*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
*
* This file part of: AstrOmatic software
*
* Copyright: (C) 2002-2020 IAP/CNRS/SorbonneU
*
* License: GNU General Public License
*
* AstrOmatic software 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.
* AstrOmatic software 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 AstrOmatic software.
* If not, see <http://www.gnu.org/licenses/>.
*
* Last modified: 26/08/2020
*
*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
#ifndef _THREADS_H_
#define _THREADS_H_
#include <pthread.h>
#include <signal.h>
/*---- Set defines according to machine's specificities and customizing -----*/
/*--------------------------- Technical constants ---------------------------*/
/*---------------------------- Synchro messages -----------------------------*/
#define STATE_FREE 0
#define STATE_READY 1
#define STATE_BUSY 2
/*------------------------------- Other Macros ------------------------------*/
#define QPTHREAD_ATTR_INIT(pthread_attr) \
{if (pthread_attr_init(pthread_attr)) \
error(EXIT_FAILURE, \
"*Error*: pthread_attr_init() failed for ", #pthread_attr );;}
#define QPTHREAD_ATTR_SETDETACHSTATE(pthread_attr, attr) \
{if (pthread_attr_setdetachstate(pthread_attr, attr)) \
error(EXIT_FAILURE, \
"*Error*: pthread_attr_setdetachstate() failed for ", \
#pthread_attr );;}
#define QPTHREAD_ATTR_DESTROY(pthread_attr) \
{if (pthread_attr_destroy(pthread_attr)) \
error(EXIT_FAILURE, \
"*Error*: pthread_attr_destroy() failed for ",#pthread_attr);;}
#define QPTHREAD_CREATE(pthread, attr, func, arg) \
{if (pthread_create(pthread, attr, func, arg)) \
error(EXIT_FAILURE, \
"*Error*: pthread_create() failed for ", #pthread );;}
#define QPTHREAD_CANCEL(pthread) \
{if (pthread_cancel(pthread)) \
warning( \
"failed to cancel ", #pthread );;}
#define QPTHREAD_JOIN(pthread, ret) \
{if (pthread_join(pthread, ret)) \
error(EXIT_FAILURE, \
"*Error*: pthread_join() failed for ", #pthread );;}
#define QPTHREAD_MUTEX_INIT(mutex, attr) \
{if (pthread_mutex_init(mutex, attr)) \
error(EXIT_FAILURE, \
"*Error*: pthread_mutex_init() failed for ", #mutex );;}
#define QPTHREAD_MUTEX_LOCK(mutex) \
{if (pthread_mutex_lock(mutex)) \
error(EXIT_FAILURE, \
"*Error*: pthread_mutex_lock() failed for ", #mutex );;}
#define QPTHREAD_MUTEX_UNLOCK(mutex) \
{if (pthread_mutex_unlock(mutex)) \
error(EXIT_FAILURE, \
"*Error*: pthread_mutex_unlock() failed for ", #mutex );;}
#define QPTHREAD_MUTEX_DESTROY(mutex) \
{if (pthread_mutex_destroy(mutex)) \
error(EXIT_FAILURE, \
"*Error*: pthread_mutex_destroy() failed for ", #mutex );;}
#define QPTHREAD_COND_INIT(cond, attr) \
{if (pthread_cond_init(cond, attr)) \
error(EXIT_FAILURE, \
"*Error*: pthread_cond_init() failed for ", #cond );;}
#define QPTHREAD_COND_WAIT(cond, mutex) \
{if (pthread_cond_wait(cond, mutex)) \
error(EXIT_FAILURE, \
"*Error*: pthread_cond_wait() failed for ", #cond );;}
#define QPTHREAD_COND_BROADCAST(cond) \
{if (pthread_cond_broadcast(cond)) \
error(EXIT_FAILURE, \
"*Error*: pthread_cond_broadcast() failed for ", #cond );;}
#define QPTHREAD_COND_SIGNAL(cond) \
{if (pthread_cond_signal(cond)) \
error(EXIT_FAILURE, \
"*Error*: pthread_cond_signal() failed for ", #cond );;}
#define QPTHREAD_COND_DESTROY(cond) \
{if (pthread_cond_destroy(cond)) \
error(EXIT_FAILURE, \
"*Error*: pthread_cond_destroy() failed for ", #cond );;}
/*------------------------------- Structures --------------------------------*/
typedef struct _threads_gate_t
{
int ngate; /* Gate counter */
int nthreads; /* Number of threads to manage */
void (*func)(void); /* Function to execute at wakeup */
pthread_mutex_t mutex; /* Main MutEx */
pthread_mutex_t block; /* Safety Mutex (avoid "rebound") */
pthread_cond_t condvar; /* Main condition variable */
pthread_cond_t last; /* To wake the remaining thread up */
} threads_gate_t;
/*----------------------------- Global variables ----------------------------*/
extern int nproc; /* Number of child threads */
/*--------------------------------- Functions -------------------------------*/
threads_gate_t *threads_gate_init(int nthreads, void (*func)(void));
extern void threads_gate_end(threads_gate_t *gate),
threads_gate_sync(threads_gate_t *gate);
#endif // _THREADS_H_
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