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Annotation of gcc/objc/mutex.h, revision 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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