include/sys/condvar.h

   1 /*
   2  *  This file is part of the SPL: Solaris Porting Layer.
   3  *
   4  *  Copyright (c) 2008 Lawrence Livermore National Security, LLC.
   5  *  Produced at Lawrence Livermore National Laboratory
   6  *  Written by:
   7  *          Brian Behlendorf <behlendorf1@llnl.gov>,
   8  *          Herb Wartens <wartens2@llnl.gov>,
   9  *          Jim Garlick <garlick@llnl.gov>
  10  *  UCRL-CODE-235197
  11  *
  12  *  This is free software; you can redistribute it and/or modify it
  13  *  under the terms of the GNU General Public License as published by
  14  *  the Free Software Foundation; either version 2 of the License, or
  15  *  (at your option) any later version.
  16  *
  17  *  This is distributed in the hope that it will be useful, but WITHOUT
  18  *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  19  *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  20  *  for more details.
  21  *
  22  *  You should have received a copy of the GNU General Public License along
  23  *  with this program; if not, write to the Free Software Foundation, Inc.,
  24  *  51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA.
  25  */
  26
  27 #ifndef _SPL_CONDVAR_H
  28 #define _SPL_CONDVAR_H
  29
  30 #ifdef  __cplusplus
  31 extern "C" {
  32 #endif
  33
  34 #include <linux/module.h>
  35 #include <linux/wait.h>
  36 #include <sys/mutex.h>
  37
  38 /* The kcondvar_t struct is protected by mutex taken externally before
  39  * calling any of the wait/signal funs, and passed into the wait funs.
  40  */
  41 #define CV_MAGIC                        0x346545f4
  42 #define CV_POISON                       0x95
  43
  44 typedef struct {
  45         int cv_magic;
  46         char *cv_name;
  47         int cv_name_size;
  48         wait_queue_head_t cv_event;
  49         atomic_t cv_waiters;
  50         kmutex_t *cv_mutex;
  51         spinlock_t cv_lock;
  52 } kcondvar_t;
  53
  54 typedef enum { CV_DEFAULT=0, CV_DRIVER } kcv_type_t;
  55
  56 extern void __cv_init(kcondvar_t *cvp, char *name, kcv_type_t type, void *arg);
  57 extern void __cv_destroy(kcondvar_t *cvp);
  58 extern void __cv_wait(kcondvar_t *cvp, kmutex_t *mp);
  59 extern clock_t __cv_timedwait(kcondvar_t *cvp, kmutex_t *mp,
  60                               clock_t expire_time);
  61 extern void __cv_signal(kcondvar_t *cvp);
  62 extern void __cv_broadcast(kcondvar_t *cvp);
  63
  64 #define cv_init(cvp, name, type, arg)                                 \
  65 ({                                                                    \
  66         if ((name) == NULL)                                           \
  67                 __cv_init(cvp, #cvp, type, arg);                      \
  68         else                                                          \
  69                 __cv_init(cvp, name, type, arg);                      \
  70 })
  71 #define cv_destroy(cvp)                 __cv_destroy(cvp)
  72 #define cv_wait(cvp, mp)                __cv_wait(cvp, mp)
  73 #define cv_timedwait(cvp, mp, t)        __cv_timedwait(cvp, mp, t)
  74 #define cv_signal(cvp)                  __cv_signal(cvp)
  75 #define cv_broadcast(cvp)               __cv_broadcast(cvp)
  76
  77 #endif /* _SPL_CONDVAR_H */