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     ___  ____     _              _____
    |  \/  (_)   | |            /  ___|
               | .  . |_ ___| |_ ___ _ __  \ `--. _ __  _   _
                | |\/| | / __| __/ _ \ '__|  `--. \ '_ \| | | |
                | |  | | \__ \ ||  __/ |    /\__/ / |_) | |_| |
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                                                 | |     __/ |
                                                 |_|    |___/
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/*
 * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, you can obtain one at https://mozilla.org/MPL/2.0/.
 *
 * See the COPYRIGHT file distributed with this work for additional
 * information regarding copyright ownership.
 */

#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;

#define ISC_ONCE_INIT PTHREAD_ONCE_INIT

/* 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 */