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Annotation of gcc/objc/mutex.h, revision 1.1.1.1

1.1       root        1: /* Copyright (C) 1992 Free Software Foundation, Inc.
                      2: 
                      3: This file is part of GNU CC.
                      4: 
                      5: GNU CC is free software; you can redistribute it and/or modify
                      6: it under the terms of the GNU General Public License as published by
                      7: the Free Software Foundation; either version 2, or (at your option)
                      8: any later version.
                      9: 
                     10: GNU CC is distributed in the hope that it will be useful,
                     11: but WITHOUT ANY WARRANTY; without even the implied warranty of
                     12: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
                     13: GNU General Public License for more details.
                     14: 
                     15: You should have received a copy of the GNU General Public License
                     16: along with GNU CC; see the file COPYING.  If not, write to
                     17: the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
                     18: 
                     19: /* As a special exception, if you link this library with files
                     20:    compiled with GCC to produce an executable, this does not cause
                     21:    the resulting executable to be covered by the GNU General Public License.
                     22:    This exception does not however invalidate any other reasons why
                     23:    the executable file might be covered by the GNU General Public License.  */
                     24: 
                     25: #ifndef _MUTEX_H
                     26: #define _MUTEX_H
                     27: 
                     28: #ifdef WANT_MUTEX
                     29: #if defined (NeXT)
                     30: #include  <cthreads.h>
                     31: #define MUTEX               mutex_t
                     32: #define MUTEX_ALLOC(mutex)  { *mutex = mutex_alloc (); }
                     33: #define MUTEX_INIT(mutex)   mutex_init (mutex)
                     34: #define MUTEX_FREE(mutex)   mutex_free (mutex)
                     35: #define MUTEX_LOCK(mutex)   mutex_lock (mutex)
                     36: #define MUTEX_UNLOCK(mutex) mutex_unlock (mutex)
                     37: #define MUTEX_ISLOCK(mutex)     mutex->lock /* Gak */
                     38: 
                     39: #elif defined (OSF)
                     40: 
                     41: #elif defined (mach)
                     42: 
                     43: #elif defined (sun)
                     44: /*
                     45:  * Sun lwp uses monitors.
                     46:  *
                     47:  * Untested.  8-Dec-91, dennisg.
                     48:  */
                     49: #include  <lwp/lwp.h>
                     50: #include  <assert.h>
                     51: 
                     52: #define MUTEX (mon_t)
                     53: 
                     54: inline MUTEX
                     55: MUTEX_ALLOC (mutex)
                     56: {
                     57:   MUTEX mon;
                     58:   
                     59:   mon_create (&mon);
                     60:   return mon;
                     61: }
                     62: 
                     63: #define MUTEX_INIT(mutex)
                     64: #define MUTEX_FREE(mutex)   mon_destroy (mutex)
                     65: 
                     66: inline void
                     67: MUTEX_LOCK (mutex)
                     68: {
                     69:   int level = mon_enter (mutex);
                     70:   assert (level);
                     71: }
                     72: 
                     73: #define MUTEX_UNLOCK(mutex) mon_exit (mutex)
                     74: 
                     75: inline int
                     76: MUTEX_ISLOCK (mutex)
                     77: {
                     78:   thread_t thread;
                     79: 
                     80:   /* Won't work? */
                     81:   return mon_waiters (mutex, &thread, NULL, 0);
                     82: }
                     83: 
                     84: #elif defined (COROUTINES)
                     85: /*
                     86:  * A environment where threads are implemented as a
                     87:  *  set of coroutines.
                     88:  */
                     89: 
                     90: #endif
                     91: #endif
                     92: 
                     93: #ifndef MUTEX
                     94: /*
                     95:  * These are default mutex handler routines.
                     96:  *  There is no mutex support.
                     97:  *
                     98:  * Let the optimizer get rid of mutexes.
                     99:  */
                    100: 
                    101: #define MUTEX void *
                    102: #define MUTEX_ALLOC(mutex)  (MUTEX)-1
                    103: #define MUTEX_INIT(mutex)   (mutex)
                    104: #define MUTEX_FREE(mutex)   (mutex)
                    105: #define MUTEX_LOCK(mutex)   (mutex)
                    106: #define MUTEX_UNLOCK(mutex) (mutex)
                    107: #define MUTEX_ISLOCK(mutex) 1
                    108: #endif
                    109: 
                    110: #endif /* not _MUTEX_H */

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