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/*
* Copyright (C) 2004, 2005, 2007 Internet Systems Consortium, Inc. ("ISC")
* Copyright (C) 1999-2001 Internet Software Consortium.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id: once.h,v 1.13 2007/06/19 23:47:18 tbox Exp $ */
#ifndef ISC_ONCE_H
#define ISC_ONCE_H 1
/*! \file */
#include <pthread.h>
#include <isc/platform.h>
#include <isc/result.h>
typedef pthread_once_t isc_once_t;
#ifdef ISC_PLATFORM_BRACEPTHREADONCEINIT
/*!
* This accomodates systems that define PTHRAD_ONCE_INIT improperly.
*/
#define ISC_ONCE_INIT { PTHREAD_ONCE_INIT }
#else
/*!
* This is the usual case.
*/
#define ISC_ONCE_INIT PTHREAD_ONCE_INIT
#endif
/* XXX We could do fancier error handling... */
#define isc_once_do(op, f) \
((pthread_once((op), (f)) == 0) ? \
ISC_R_SUCCESS : ISC_R_UNEXPECTED)
#endif /* ISC_ONCE_H */
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