/*

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* Copyright (C) Internet Systems Consortium, Inc. ("ISC")

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*

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* This Source Code Form is subject to the terms of the Mozilla Public

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* License, v. 2.0. If a copy of the MPL was not distributed with this

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* file, you can obtain one at https://mozilla.org/MPL/2.0/.

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*

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* See the COPYRIGHT file distributed with this work for additional

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* information regarding copyright ownership.

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*/

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#ifndef ISC_ONCE_H

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#define ISC_ONCE_H 1

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/*! \file */

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#include <pthread.h>

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#include <isc/platform.h>

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#include <isc/result.h>

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typedef pthread_once_t isc_once_t;

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#ifdef ISC_PLATFORM_BRACEPTHREADONCEINIT

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/*!

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* This accommodates systems that define PTHRAD_ONCE_INIT improperly.

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*/

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#define ISC_ONCE_INIT { PTHREAD_ONCE_INIT }

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#else

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/*!

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* This is the usual case.

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*/

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#define ISC_ONCE_INIT PTHREAD_ONCE_INIT

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#endif

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/* XXX We could do fancier error handling... */

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#define isc_once_do(op, f) \

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((pthread_once((op), (f)) == 0) ? \

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ISC_R_SUCCESS : ISC_R_UNEXPECTED)

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#endif /* ISC_ONCE_H */

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