1 /* $NetBSD: once.h,v 1.4 2014/12/10 04:38:00 christos Exp $ */ 2 3 /* 4 * Copyright (C) 2004, 2005, 2007 Internet Systems Consortium, Inc. ("ISC") 5 * Copyright (C) 1999-2001 Internet Software Consortium. 6 * 7 * Permission to use, copy, modify, and/or distribute this software for any 8 * purpose with or without fee is hereby granted, provided that the above 9 * copyright notice and this permission notice appear in all copies. 10 * 11 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH 12 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY 13 * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, 14 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM 15 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE 16 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR 17 * PERFORMANCE OF THIS SOFTWARE. 18 */ 19 20 /* Id: once.h,v 1.13 2007/06/19 23:47:18 tbox Exp */ 21 22 #ifndef ISC_ONCE_H 23 #define ISC_ONCE_H 1 24 25 /*! \file */ 26 27 #include <pthread.h> 28 29 #include <isc/platform.h> 30 #include <isc/result.h> 31 32 typedef pthread_once_t isc_once_t; 33 34 #ifdef ISC_PLATFORM_BRACEPTHREADONCEINIT 35 /*! 36 * This accomodates systems that define PTHRAD_ONCE_INIT improperly. 37 */ 38 #define ISC_ONCE_INIT { PTHREAD_ONCE_INIT } 39 #else 40 /*! 41 * This is the usual case. 42 */ 43 #define ISC_ONCE_INIT PTHREAD_ONCE_INIT 44 #endif 45 46 /* XXX We could do fancier error handling... */ 47 48 #define isc_once_do(op, f) \ 49 ((pthread_once((op), (f)) == 0) ? \ 50 ISC_R_SUCCESS : ISC_R_UNEXPECTED) 51 52 #endif /* ISC_ONCE_H */ 53