sema.c

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    1 /* 
    2  * Mach Operating System
    3  * Copyright (c) 1992,1991 Carnegie Mellon University
    4  * Copyright (c) 1992,1991 Sequent Computer Systems
    5  * All Rights Reserved.
    6  * 
    7  * Permission to use, copy, modify and distribute this software and its
    8  * documentation is hereby granted, provided that both the copyright
    9  * notice and this permission notice appear in all copies of the
   10  * software, derivative works or modified versions, and any portions
   11  * thereof, and that both notices appear in supporting documentation.
   12  * 
   13  * CARNEGIE MELLON AND SEQUENT COMPUTER SYSTEMS ALLOW FREE USE OF
   14  * THIS SOFTWARE IN ITS "AS IS" CONDITION.  CARNEGIE MELLON AND
   15  * SEQUENT COMPUTER SYSTEMS DISCLAIM ANY LIABILITY OF ANY KIND FOR
   16  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
   17  * 
   18  * Carnegie Mellon requests users of this software to return to
   19  * 
   20  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
   21  *  School of Computer Science
   22  *  Carnegie Mellon University
   23  *  Pittsburgh PA 15213-3890
   24  * 
   25  * any improvements or extensions that they make and grant Carnegie Mellon 
   26  * the rights to redistribute these changes.
   27  */
   28 
   29 /*
   30  * HISTORY
   31  * $Log:        sema.c,v $
   32  * Revision 2.4  93/01/14  17:56:09  danner
   33  *      Fix calls to sched_prim functions.
   34  *      [92/12/31            dbg]
   35  * 
   36  * Revision 2.3  91/07/31  18:03:32  dbg
   37  *      Changed copyright.
   38  *      [91/07/31            dbg]
   39  * 
   40  * Revision 2.2  91/05/08  12:58:36  dbg
   41  *      Created.
   42  *      [91/04/26  14:56:44  dbg]
   43  * 
   44  */
   45 
   46 /*
   47  * Dynix semaphores.
   48  */
   49 #include <kern/sched_prim.h>
   50 
   51 #include <sqt/mutex.h>
   52 
   53 #define sema_lock(sema)         (bit_lock(0, &(sema)->lock))
   54 
   55 #define sema_unlock(sema)       (bit_unlock(0, &(sema)->lock))
   56 
   57 /*ARGSUSED*/
   58 init_sema(sema, val, flags, gate)
   59         register sema_t *sema;
   60         int             val;
   61 {
   62         sema->lock = 0;
   63         sema->waiting = 0;
   64         sema->count = val;
   65 }
   66 
   67 /*ARGUSED*/
   68 p_sema(sema, pri)
   69         register sema_t *sema;
   70         int     pri;
   71 {
   72         sema_lock(sema);
   73 
   74         if (--sema->count >= 0) {
   75             sema_unlock(sema);
   76             return;
   77         }
   78         sema->waiting = TRUE;
   79         assert_wait(sema, FALSE);
   80         sema_unlock(sema);
   81         thread_block((void (*)()) 0);
   82 }
   83 
   84 p_sema_v_lock(sema, pri, l, spl)
   85         register sema_t *sema;
   86         int             pri;
   87         simple_lock_t   l;
   88         int             spl;
   89 {
   90         sema_lock(sema);
   91 
   92         if (--sema->count >= 0) {
   93             sema_unlock(sema);
   94             v_lock(l,spl);
   95             return;
   96         }
   97         sema->waiting = TRUE;
   98         assert_wait(sema, FALSE);
   99         sema_unlock(sema);
  100         v_lock(l,spl);
  101         thread_block((void (*)()) 0);
  102 }
  103 
  104 cp_sema(sema)
  105         register sema_t *sema;
  106 {
  107         sema_lock(sema);
  108         if (--sema->count >= 0) {
  109             sema_unlock(sema);
  110             return (TRUE);
  111         }
  112         sema_unlock(sema);
  113         return (FALSE);
  114 }
  115 
  116 v_sema(sema)
  117         register sema_t *sema;
  118 {
  119         sema_lock(sema);
  120         if (++sema->count >= 0) {
  121             if (sema->waiting) {
  122                 thread_wakeup(sema);
  123                 sema->waiting = 0;
  124             }
  125         }
  126         sema_unlock(sema);
  127 }
  128 
  129 cv_sema(sema)
  130         register sema_t *sema;
  131 {
  132         v_sema(sema);
  133 }
  134 
  135 vall_sema(sema)
  136         register sema_t *sema;
  137 {
  138         sema_lock(sema);
  139         while (++sema->count <= 0) {
  140             if (sema->waiting) {
  141                 thread_wakeup(sema);
  142                 sema->waiting = 0;
  143             }
  144         }
  145         sema_unlock(sema);
  146 }
  147

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FreeBSD/Linux Kernel Cross Reference sys/sqt/sema.c

FreeBSD/Linux Kernel Cross Reference
sys/sqt/sema.c