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/* $Id$
*
* This file is part of the ESO C Extension Library
* Copyright (C) 2001-2011 European Southern Observatory
*
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
/*
* $Author$
* $Date$
* $Revision$
* $Name$
*/
#ifndef CXTHREAD_H_
#define CXTHREAD_H_
#if HAVE_CONFIG_H
# include "config.h"
#endif
#ifdef HAVE_PTHREAD_H
# include <pthread.h>
#endif
#include <cxtypes.h>
/*
* Map local types and functions to the POSIX thread model implementation
*/
#if defined(CX_THREADS_ENABLED)
#if defined(HAVE_PTHREAD_H)
#define CX_STATIC_MUTEX_INIT PTHREAD_MUTEX_INITIALIZER
#define CX_STATIC_ONCE_INIT PTHREAD_ONCE_INIT
typedef pthread_mutex_t cx_mutex;
typedef pthread_once_t cx_once;
typedef pthread_key_t cx_private;
#define cx_mutex_lock(mutex) pthread_mutex_lock((mutex))
#define cx_mutex_trylock(mutex) pthread_mutex_trylock((mutex))
#define cx_mutex_unlock(mutex) pthread_mutex_unlock((mutex))
#define cx_thread_once(name, func, args) pthread_once(&(name), (func))
#define cx_private_init(name, func) pthread_key_create(&(name), (func))
#define cx_private_set(name, data) pthread_setspecific((name), (data))
#define cx_private_get(name) pthread_getspecific((name))
#else /* !HAVE_PTHREAD_H */
# error "Thread support is requested, but POSIX thread model is not present!"
#endif /* !HAVE_PTHREAD_H */
#else /* !CX_THREADS_ENABLED */
typedef struct cx_private cx_private;
#define cx_mutex_lock(mutex) /* empty */
#define cx_mutex_trylock(mutex) /* empty */
#define cx_mutex_unlock(mutex) /* empty */
#define cx_thread_once(name, func, args) (func)()
#define cx_private_init(name, func) /* empty */
#define cx_private_set(name, data) ((name) = (data))
#define cx_private_get(name) (name)
#endif /* !CX_THREADS_ENABLED */
/*
* Convenience macros to setup locks for global variables.
* These macros expand to nothing, if thread support was not enabled.
*/
#define CX_LOCK_NAME(name) _cx__ ## name ## _lock
#if defined(CX_THREADS_ENABLED)
# define CX_LOCK_DEFINE_STATIC(name) static CX_LOCK_DEFINE(name)
# define CX_LOCK_DEFINE(name) cx_mutex CX_LOCK_NAME(name) = CX_STATIC_MUTEX_INIT
# define CX_LOCK_EXTERN(name) extern cx_mutex CX_LOCK_NAME(name)
# define CX_LOCK(name) cx_mutex_lock(&CX_LOCK_NAME(name))
# define CX_TRYLOCK(name) cx_mutex_trylock(&CX_LOCK_NAME(name))
# define CX_UNLOCK(name) cx_mutex_unlock(&CX_LOCK_NAME(name))
#else /* !CX_THREADS_ENABLED */
# define CX_LOCK_DEFINE_STATIC(name) /* empty */
# define CX_LOCK_DEFINE(name) /* empty */
# define CX_LOCK_EXTERN(name) /* empty */
# define CX_LOCK(name) /* empty */
# define CX_TRYLOCK(name) (TRUE)
# define CX_UNLOCK(name) /* empty */
#endif /* !CX_THREADS_ENABLED */
/*
* Convenience macros for setting up mutexes for one time initalizations
*/
#if defined(CX_THREADS_ENABLED)
# define CX_ONCE_DEFINE_STATIC(name) static CX_ONCE_DEFINE(name)
# define CX_ONCE_DEFINE(name) cx_once (name) = CX_STATIC_ONCE_INIT
#else /* !CX_THREADS_ENABLED */
# define CX_ONCE_DEFINE_STATIC(name) /* empty */
# define CX_ONCE_DEFINE(name) /* empty */
#endif /* !CX_THREADS_ENABLED */
/*
* Convenience macros for setting up thread-specific data
*/
#if defined(CX_THREADS_ENABLED)
# define CX_PRIVATE_DEFINE_STATIC(name) cx_private (name)
#else /* !CX_THREADS_ENABLED */
# define CX_PRIVATE_DEFINE_STATIC(name) static cx_private *(name)
#endif /* !CX_THREADS_ENABLED */
#endif /* CXTHREAD_H_ */
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