once.h

来自「Linux下利用NTP协议的网络时间同步客户端」· C头文件 代码 · 共 44 行

/*
 * Copyright (C) 1999-2001  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 1.6 2001/01/09 21:59:06 bwelling Exp $ */

#ifndef ISC_ONCE_H
#define ISC_ONCE_H 1

#include <isc/lang.h>
#include <isc/result.h>

ISC_LANG_BEGINDECLS

typedef struct {
	int status;
	int counter;
} isc_once_t;

#define ISC_ONCE_INIT_NEEDED 0
#define ISC_ONCE_INIT_DONE 1

#define ISC_ONCE_INIT { ISC_ONCE_INIT_NEEDED, 1 }

isc_result_t
isc_once_do(isc_once_t *controller, void(*function)(void));

ISC_LANG_ENDDECLS

#endif /* ISC_ONCE_H */