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- /* Copyright (C) 1992 Free Software Foundation, Inc.
-
- This file is part of GNU CC.
-
- GNU CC 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.
-
- GNU CC 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 GNU CC; see the file COPYING. If not, write to
- the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- /* As a special exception, if you link this library with files
- compiled with GCC to produce an executable, this does not cause
- the resulting executable to be covered by the GNU General Public License.
- This exception does not however invalidate any other reasons why
- the executable file might be covered by the GNU General Public License. */
-
- #ifndef _MUTEX_H
- #define _MUTEX_H
-
- #ifdef WANT_MUTEX
- #if defined (NeXT)
- #include <cthreads.h>
- #define MUTEX mutex_t
- #define MUTEX_ALLOC(mutex) { *mutex = mutex_alloc (); }
- #define MUTEX_INIT(mutex) mutex_init (mutex)
- #define MUTEX_FREE(mutex) mutex_free (mutex)
- #define MUTEX_LOCK(mutex) mutex_lock (mutex)
- #define MUTEX_UNLOCK(mutex) mutex_unlock (mutex)
- #define MUTEX_ISLOCK(mutex) mutex->lock /* Gak */
-
- #elif defined (OSF)
-
- #elif defined (mach)
-
- #elif defined (sun)
- /*
- * Sun lwp uses monitors.
- *
- * Untested. 8-Dec-91, dennisg.
- */
- #include <lwp/lwp.h>
- #include <assert.h>
-
- #define MUTEX (mon_t)
-
- inline MUTEX
- MUTEX_ALLOC (mutex)
- {
- MUTEX mon;
-
- mon_create (&mon);
- return mon;
- }
-
- #define MUTEX_INIT(mutex)
- #define MUTEX_FREE(mutex) mon_destroy (mutex)
-
- inline void
- MUTEX_LOCK (mutex)
- {
- int level = mon_enter (mutex);
- assert (level);
- }
-
- #define MUTEX_UNLOCK(mutex) mon_exit (mutex)
-
- inline int
- MUTEX_ISLOCK (mutex)
- {
- thread_t thread;
-
- /* Won't work? */
- return mon_waiters (mutex, &thread, NULL, 0);
- }
-
- #elif defined (COROUTINES)
- /*
- * A environment where threads are implemented as a
- * set of coroutines.
- */
-
- #endif
- #endif
-
- #ifndef MUTEX
- /*
- * These are default mutex handler routines.
- * There is no mutex support.
- *
- * Let the optimizer get rid of mutexes.
- */
-
- #define MUTEX void *
- #define MUTEX_ALLOC(mutex) (MUTEX)-1
- #define MUTEX_INIT(mutex) (mutex)
- #define MUTEX_FREE(mutex) (mutex)
- #define MUTEX_LOCK(mutex) (mutex)
- #define MUTEX_UNLOCK(mutex) (mutex)
- #define MUTEX_ISLOCK(mutex) 1
- #endif
-
- #endif /* not _MUTEX_H */
-