Prex Home / Browse Source - Prex Version: 0.9.0

root/sys/include/sync.h

INCLUDED FROM

   1 /*-
   2  * Copyright (c) 2005-2008, Kohsuke Ohtani
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the author nor the names of any co-contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  30 #ifndef _SYNC_H
  31 #define _SYNC_H
  33 #include <types.h>
  34 #include <sys/cdefs.h>
  35 #include <sys/list.h>
  36 #include <event.h>
  38 struct sem {
  39         struct sem      *next;          /* linkage on semaphore list in system */
  40         struct list     task_link;      /* linkage on semaphore list in task */
task_t          owner;          /* owner task */
  42         struct event    event;          /* event */
u_int           value;          /* current value */
  44         int             refcnt;         /* reference count */
  45 };
  47 struct mutex {
  48         struct list     task_link;      /* linkage on mutex list in task */
task_t          owner;          /* owner task */
  50         struct event    event;          /* event */
  51         struct list     link;           /* linkage on locked mutex list */
thread_t        holder;         /* thread that holds the mutex */
  53         int             priority;       /* highest priority in waiting threads */
  54         int             locks;          /* counter for recursive lock */
  55 };
  57 struct cond {
  58         struct list     task_link;      /* linkage on cv list in task */
task_t          owner;          /* owner task */
  60         struct event    event;          /* event */
  61 };
  63 /* maximum value for semaphore. */
  64 #define MAXSEMVAL               ((u_int)((~0u) >> 1))
  66 /* max mutex count to inherit priority */
  67 #define MAXINHERIT              10
  69 #define MUTEX_INITIALIZER       (mutex_t)0x4d496e69     /* 'MIni' */
  70 #define COND_INITIALIZER        (cond_t)0x43496e69      /* 'CIni' */
__BEGIN_DECLS
  73 int      sem_init(sem_t *, u_int);
  74 int      sem_destroy(sem_t *);
  75 int      sem_wait(sem_t *, u_long);
  76 int      sem_trywait(sem_t *);
  77 int      sem_post(sem_t *);
  78 int      sem_getvalue(sem_t *, u_int *);
  79 void     sem_cleanup(task_t);
  81 int      mutex_init(mutex_t *);
  82 int      mutex_destroy(mutex_t *);
  83 int      mutex_lock(mutex_t *);
  84 int      mutex_trylock(mutex_t *);
  85 int      mutex_unlock(mutex_t *);
  86 void     mutex_cancel(thread_t);
  87 void     mutex_setpri(thread_t, int);
  88 void     mutex_cleanup(task_t);
  90 int      cond_init(cond_t *);
  91 int      cond_destroy(cond_t *);
  92 int      cond_wait(cond_t *, mutex_t *);
  93 int      cond_signal(cond_t *);
  94 int      cond_broadcast(cond_t *);
  95 void     cond_cleanup(task_t);
__END_DECLS
  98 #endif /* !_SYNC_H */