contrib/bind-9.2.4rc7/lib/isc/pthreads/include/isc/once.h

   1 /*
   2  * Copyright (C) 2004  Internet Systems Consortium, Inc. ("ISC")
   3  * Copyright (C) 1999-2001  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: once.h,v 1.8.2.1 2004/03/09 06:12:08 marka Exp $ */
  19
  20 #ifndef ISC_ONCE_H
  21 #define ISC_ONCE_H 1
  22
  23 #include <pthread.h>
  24
  25 #include <isc/platform.h>
  26 #include <isc/result.h>
  27
  28 typedef pthread_once_t isc_once_t;
  29
  30 #ifdef ISC_PLATFORM_BRACEPTHREADONCEINIT
  31 /*
  32  * This accomodates systems that define PTHRAD_ONCE_INIT improperly.
  33  */
  34 #define ISC_ONCE_INIT { PTHREAD_ONCE_INIT }
  35 #else
  36 /*
  37  * This is the usual case.
  38  */
  39 #define ISC_ONCE_INIT PTHREAD_ONCE_INIT
  40 #endif
  41
  42 /* XXX We could do fancier error handling... */
  43
  44 #define isc_once_do(op, f) \
  45         ((pthread_once((op), (f)) == 0) ? \
  46          ISC_R_SUCCESS : ISC_R_UNEXPECTED)
  47
  48 #endif /* ISC_ONCE_H */