dist/ntp/include/isc/mutex.h

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Copyright (C) 2000, 2001  Internet Software Consortium.
   5  *
   6  * Permission to use, copy, modify, and distribute this software for any
   7  * purpose with or without fee is hereby granted, provided that the above
   8  * copyright notice and this permission notice appear in all copies.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM
  11  * DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
  12  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
  13  * INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT,
  14  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
  15  * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
  16  * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
  17  * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  18  */
  19
  20 /* Id: mutex.h,v 1.3 2001/01/09 21:57:55 bwelling Exp */
  21
  22 #ifndef ISC_MUTEX_H
  23 #define ISC_MUTEX_H 1
  24
  25 #include <isc/result.h>         /* for ISC_R_ codes */
  26
  27 typedef int isc_mutex_t;
  28
  29 #define isc_mutex_init(mp) \
  30         (*(mp) = 0, ISC_R_SUCCESS)
  31 #define isc_mutex_lock(mp) \
  32         ((*(mp))++ == 0 ? ISC_R_SUCCESS : ISC_R_UNEXPECTED)
  33 #define isc_mutex_unlock(mp) \
  34         (--(*(mp)) == 0 ? ISC_R_SUCCESS : ISC_R_UNEXPECTED)
  35 #define isc_mutex_trylock(mp) \
  36         (*(mp) == 0 ? ((*(mp))++, ISC_R_SUCCESS) : ISC_R_LOCKBUSY)
  37 #define isc_mutex_destroy(mp) \
  38         (*(mp) == 0 ? (*(mp) = -1, ISC_R_SUCCESS) : ISC_R_UNEXPECTED)
  39 #define isc_mutex_stats(fp)
  40
  41 #endif /* ISC_MUTEX_H */