once.h revision 40f53fa8d9c6a4fc38c0014495e7a42b08f52481
/*
* Copyright (C) 1999, 2000 Internet Software Consortium.
*
* Permission to use, copy, modify, and 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 INTERNET SOFTWARE CONSORTIUM
* DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
* INTERNET SOFTWARE CONSORTIUM 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 1.7 2000/08/01 01:31:07 tale Exp $ */
#ifndef ISC_ONCE_H
#define ISC_ONCE_H 1
#include <pthread.h>
#include <isc/platform.h>
typedef pthread_once_t isc_once_t;
/*
* 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) ? \
#endif /* ISC_ONCE_H */