1/* 2 * Copyright (C) 2004, 2005, 2007 Internet Systems Consortium, Inc. ("ISC") 3 * Copyright (C) 1999-2001 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: once.h,v 1.13 2007/06/19 23:47:18 tbox Exp $ */ 19 20#ifndef ISC_ONCE_H 21#define ISC_ONCE_H 1 22 23/*! \file */ 24 25#include <pthread.h> 26 27#include <isc/platform.h> 28#include <isc/result.h> 29 30typedef pthread_once_t isc_once_t; 31 32#ifdef ISC_PLATFORM_BRACEPTHREADONCEINIT 33/*! 34 * This accomodates systems that define PTHRAD_ONCE_INIT improperly. 35 */ 36#define ISC_ONCE_INIT { PTHREAD_ONCE_INIT } 37#else 38/*! 39 * This is the usual case. 40 */ 41#define ISC_ONCE_INIT PTHREAD_ONCE_INIT 42#endif 43 44/* XXX We could do fancier error handling... */ 45 46#define isc_once_do(op, f) \ 47 ((pthread_once((op), (f)) == 0) ? \ 48 ISC_R_SUCCESS : ISC_R_UNEXPECTED) 49 50#endif /* ISC_ONCE_H */ 51