contrib/bind-9.5.2/lib/isc/nothreads/include/isc/mutex.h

   1 /*
   2  * Copyright (C) 2004, 2007  Internet Systems Consortium, Inc. ("ISC")
   3  * Copyright (C) 2000, 2001  Internet Software Consortium.
   4  *
   5  * Permission to use, copy, modify, and/or distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
  10  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
  11  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
  12  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
  13  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
  14  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  15  * PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 /* $Id: mutex.h,v 1.6 2007/06/19 23:47:18 tbox Exp $ */
  19
  20 #ifndef ISC_MUTEX_H
  21 #define ISC_MUTEX_H 1
  22
  23 #include <isc/result.h>         /* for ISC_R_ codes */
  24
  25 typedef int isc_mutex_t;
  26
  27 #define isc_mutex_init(mp) \
  28         (*(mp) = 0, ISC_R_SUCCESS)
  29 #define isc_mutex_lock(mp) \
  30         ((*(mp))++ == 0 ? ISC_R_SUCCESS : ISC_R_UNEXPECTED)
  31 #define isc_mutex_unlock(mp) \
  32         (--(*(mp)) == 0 ? ISC_R_SUCCESS : ISC_R_UNEXPECTED)
  33 #define isc_mutex_trylock(mp) \
  34         (*(mp) == 0 ? ((*(mp))++, ISC_R_SUCCESS) : ISC_R_LOCKBUSY)
  35 #define isc_mutex_destroy(mp) \
  36         (*(mp) == 0 ? (*(mp) = -1, ISC_R_SUCCESS) : ISC_R_UNEXPECTED)
  37 #define isc_mutex_stats(fp)
  38
  39 #endif /* ISC_MUTEX_H */