contrib/bind-9.2.4rc7/lib/isc/nothreads/include/isc/condition.h

   1 /*
   2  * Copyright (C) 2004  Internet Systems Consortium, Inc. ("ISC")
   3  * Copyright (C) 2000, 2001  Internet Software Consortium.
   4  *
   5  * Permission to use, copy, modify, and 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: condition.h,v 1.3.2.1 2004/03/09 06:12:05 marka Exp $ */
  19
  20 /*
  21  * This provides a limited subset of the isc_condition_t
  22  * functionality for use by single-threaded programs that
  23  * need to block waiting for events.   Only a single
  24  * call to isc_condition_wait() may be blocked at any given
  25  * time, and the _waituntil and _broadcast functions are not
  26  * supported.  This is intended primarily for use by the omapi
  27  * library, and may go away once omapi goes away.  Use for
  28  * other purposes is strongly discouraged.
  29  */
  30
  31 #ifndef ISC_CONDITION_H
  32 #define ISC_CONDITION_H 1
  33
  34 #include <isc/mutex.h>
  35
  36 typedef int isc_condition_t;
  37
  38 isc_result_t isc__nothread_wait_hack(isc_condition_t *cp, isc_mutex_t *mp);
  39 isc_result_t isc__nothread_signal_hack(isc_condition_t *cp);
  40
  41 #define isc_condition_init(cp) \
  42         (*(cp) = 0, ISC_R_SUCCESS)
  43
  44 #define isc_condition_wait(cp, mp) \
  45         isc__nothread_wait_hack(cp, mp)
  46
  47 #define isc_condition_waituntil(cp, mp, tp) \
  48         ((void)(cp), (void)(mp), (void)(tp), ISC_R_NOTIMPLEMENTED)
  49
  50 #define isc_condition_signal(cp) \
  51         isc__nothread_signal_hack(cp)
  52
  53 #define isc_condition_broadcast(cp) \
  54         ((void)(cp), ISC_R_NOTIMPLEMENTED)
  55
  56 #define isc_condition_destroy(cp) \
  57         (*(cp) == 0 ? (*(cp) = -1, ISC_R_SUCCESS) : ISC_R_UNEXPECTED)
  58
  59 #endif /* ISC_CONDITION_H */