35 lines
1.2 KiB
C
35 lines
1.2 KiB
C
/* $NetBSD: once.h,v 1.2 2003/12/04 16:23:36 drochner Exp $ */
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/*
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* Copyright (C) 2000, 2001 Internet Software Consortium.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM
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* DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
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* INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT,
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* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
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* FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
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* NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
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* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/* Id: once.h,v 1.3 2001/01/09 21:57:56 bwelling Exp */
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#ifndef ISC_ONCE_H
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#define ISC_ONCE_H 1
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#include <isc/result.h>
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typedef isc_boolean_t isc_once_t;
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#define ISC_ONCE_INIT ISC_FALSE
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#define isc_once_do(op, f) \
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(!*(op) ? (f(), *(op) = ISC_TRUE, ISC_R_SUCCESS) : ISC_R_SUCCESS)
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#endif /* ISC_ONCE_H */
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