1 /* $NetBSD: condvar.h,v 1.13 2016/04/09 16:59:43 riastradh Exp $ */ 2 3 /*- 4 * Copyright (c) 2006, 2007, 2008 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Andrew Doran. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #ifndef _SYS_CONDVAR_H_ 33 #define _SYS_CONDVAR_H_ 34 35 typedef struct kcondvar { 36 void *cv_opaque[3]; 37 } kcondvar_t; 38 39 #ifdef _KERNEL 40 41 struct kmutex; 42 43 void cv_init(kcondvar_t *, const char *); 44 void cv_destroy(kcondvar_t *); 45 46 void cv_wait(kcondvar_t *, struct kmutex *); 47 int cv_wait_sig(kcondvar_t *, struct kmutex *); 48 int cv_timedwait(kcondvar_t *, struct kmutex *, int); 49 int cv_timedwait_sig(kcondvar_t *, struct kmutex *, int); 50 51 void cv_signal(kcondvar_t *); 52 void cv_broadcast(kcondvar_t *); 53 54 bool cv_has_waiters(kcondvar_t *); 55 bool cv_is_valid(kcondvar_t *); 56 57 /* The "lightning bolt", awoken once per second by the clock interrupt. */ 58 extern kcondvar_t lbolt; 59 60 #endif /* _KERNEL */ 61 62 #endif /* _SYS_CONDVAR_H_ */ 63