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/* classes: h_files */
#ifndef SCM_NULL_THREADS_H
#define SCM_NULL_THREADS_H
/* Copyright (C) 2002 Free Software Foundation, Inc.
*
* 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 software; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307 USA
*
* As a special exception, the Free Software Foundation gives permission
* for additional uses of the text contained in its release of GUILE.
*
* The exception is that, if you link the GUILE library with other files
* to produce an executable, this does not by itself cause the
* resulting executable to be covered by the GNU General Public License.
* Your use of that executable is in no way restricted on account of
* linking the GUILE library code into it.
*
* This exception does not however invalidate any other reasons why
* the executable file might be covered by the GNU General Public License.
*
* This exception applies only to the code released by the
* Free Software Foundation under the name GUILE. If you copy
* code from other Free Software Foundation releases into a copy of
* GUILE, as the General Public License permits, the exception does
* not apply to the code that you add in this way. To avoid misleading
* anyone as to the status of such modified files, you must delete
* this exception notice from them.
*
* If you write modifications of your own for GUILE, it is your choice
* whether to permit this exception to apply to your modifications.
* If you do not wish that, delete this exception notice. */
/* The null-threads implementation. We provide the standard API, but
no new threads can be created.
*/
/* We can't switch so don't bother trying.
*/
#undef SCM_THREAD_SWITCHING_CODE
#define SCM_THREAD_SWITCHING_CODE
#define scm_t_thread int
/* The "(void)(...)" constructs in the expansions are there to ensure
that the side effects of the argument expressions take place.
*/
#define scm_thread_create(th,proc,data) ((void)(proc), (void)(data), ENOTSUP)
#define scm_thread_join(th) do { (void)(th); abort(); } while(0)
#define scm_thread_detach(th) do { (void)(th); abort(); } while(0)
#define scm_thread_self() 0
#define scm_t_mutex int
#define scm_mutex_init(mx) do { (void)(mx); } while(0)
#define scm_mutex_destroy(mx) do { (void)(mx); } while(0)
#define scm_mutex_lock(mx) do { (void)(mx); } while(0)
#define scm_mutex_trylock(mx) ((void)(mx), 1)
#define scm_mutex_unlock(mx) do { (void)(mx); } while(0)
#define scm_t_cond int
#define scm_cond_init(cv) do { (void)(cv); } while(0)
#define scm_cond_destroy(cv) do { (void)(cv); } while(0)
#define scm_cond_wait(cv,mx) ((void)(cv), (void)(mx), ENOTSUP)
#define scm_cond_timedwait(cv,mx,at) ((void)(cv), (void)(mx), (void)(at), \
ENOTSUP)
#define scm_cond_signal(cv) do { (void)(cv); } while(0)
#define scm_cond_broadcast(cv) do { (void)(cv); } while(0)
#define scm_thread_select select
typedef void **scm_t_key;
#define scm_key_create(keyp) do { *(keyp) = malloc(sizeof(void*)); \
} while(0)
#define scm_key_delete(key) do { free(key); } while(0)
#define scm_key_setspecific(key, value) do { *(key) = (value); } while(0)
#define scm_key_getspecific(key) *(key)
#if 0
/* These are the actual prototypes of the functions/macros defined
above. We list them here for reference. */
typedef int scm_t_thread;
SCM_API int scm_thread_create (scm_t_thread *th,
void (*proc) (void *), void *data);
SCM_API void scm_thread_join (scm_t_thread th);
SCM_API void scm_thread_detach (scm_t_thread th);
SCM_API scm_t_thread scm_thread_self (void);
typedef int scm_t_mutex;
SCM_API void scm_mutex_init (scm_t_mutex *mx);
SCM_API void scm_mutex_destroy (scm_t_mutex *mx);
SCM_API void scm_mutex_lock (scm_t_mutex *mx);
SCM_API int scm_mutex_trylock (scm_t_mutex *mx);
SCM_API void scm_mutex_unlock (scm_t_mutex *mx);
typedef int scm_t_cond;
SCM_API void scm_cond_init (scm_t_cond *cv);
SCM_API void scm_cond_destroy (scm_t_cond *cv);
SCM_API void scm_cond_wait (scm_t_cond *cv, scm_t_mutex *mx);
SCM_API int scm_cond_timedwait (scm_t_cond *cv, scm_t_mutex *mx,
struct timespec *abstime);
SCM_API void scm_cond_signal (scm_t_cond *cv);
SCM_API void scm_cond_broadcast (scm_t_cond *cv);
typedef int scm_t_key;
SCM_API void scm_key_create (scm_t_key *keyp);
SCM_API void scm_key_delete (scm_t_key key);
SCM_API void scm_key_setspecific (scm_t_key key, const void *value);
SCM_API void *scm_key_getspecific (scm_t_key key);
SCM_API int scm_thread_select (int nfds,
SELECT_TYPE *readfds,
SELECT_TYPE *writefds,
SELECT_TYPE *exceptfds,
struct timeval *timeout);
#endif
#endif /* SCM_NULL_THREADS_H */
/*
Local Variables:
c-file-style: "gnu"
End:
*/
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