The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/once.h

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    1 /*      $NetBSD: once.h,v 1.7 2019/03/19 08:16:51 ryo Exp $     */
    2 
    3 /*-
    4  * Copyright (c)2005 YAMAMOTO Takashi,
    5  * Copyright (c)2008 Antti Kantee,
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  */
   29 
   30 #ifndef _SYS_ONCE_H_
   31 #define _SYS_ONCE_H_
   32 
   33 typedef struct {
   34         int o_error;
   35         uint16_t o_refcnt;
   36         uint16_t o_status;
   37 #define ONCE_VIRGIN     0
   38 #define ONCE_RUNNING    1
   39 #define ONCE_DONE       2
   40 } once_t;
   41 
   42 void once_init(void);
   43 int _init_once(once_t *, int (*)(void));
   44 void _fini_once(once_t *, void (*)(void));
   45 
   46 #define ONCE_DECL(o) \
   47         once_t (o) = { \
   48                 .o_status = 0, \
   49                 .o_refcnt = 0, \
   50         };
   51 
   52 #define RUN_ONCE(o, fn) \
   53     (__predict_true((o)->o_status == ONCE_DONE) ? \
   54       ((o)->o_error) : _init_once((o), (fn)))
   55 
   56 #define INIT_ONCE(o, fn)        _init_once((o), (fn))
   57 #define FINI_ONCE(o, fn)        _fini_once((o), (fn))
   58 
   59 #endif /* _SYS_ONCE_H_ */

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