1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #ifndef _SYS_WAITQ_H 27 #define _SYS_WAITQ_H 28 29 #ifdef __cplusplus 30 extern "C" { 31 #endif 32 33 #ifdef _KERNEL 34 35 #include <sys/types.h> 36 #include <sys/machlock.h> 37 #include <sys/thread.h> 38 39 typedef struct waitq { 40 disp_lock_t wq_lock; /* protects all fields */ 41 kthread_t *wq_first; /* first thread on the queue */ 42 int wq_count; /* number of threads on the queue */ 43 boolean_t wq_blocked; /* True if threads can't be enqueued */ 44 } waitq_t; 45 46 extern void waitq_init(waitq_t *); 47 extern void waitq_fini(waitq_t *); 48 49 /* 50 * Place the thread on the wait queue. An attempt to enqueue a thread onto a 51 * blocked queue fails and returns zero. Successful enqueue returns non-zero 52 * value. 53 */ 54 extern int waitq_enqueue(waitq_t *, kthread_t *); 55 56 /* 57 * Take thread off its wait queue and make it runnable. 58 */ 59 extern void waitq_setrun(kthread_t *t); 60 61 /* 62 * Change priority for the thread on wait queue. 63 */ 64 extern void waitq_change_pri(kthread_t *, pri_t); 65 66 /* 67 * Take the first thread off the wait queue and make it runnable. 68 */ 69 extern void waitq_runone(waitq_t *); 70 71 /* 72 * Return True if there are no threads on the queue. 73 */ 74 extern boolean_t waitq_isempty(waitq_t *); 75 76 /* 77 * Prevent and allow placing new threads on wait queue. 78 */ 79 extern void waitq_block(waitq_t *); 80 extern void waitq_unblock(waitq_t *); 81 82 #endif /* _KERNEL */ 83 84 #ifdef __cplusplus 85 } 86 #endif 87 88 #endif /* _SYS_WAITQ_H */ 89