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 #pragma ident "%Z%%M% %I% %E% SMI" 30 31 #ifdef __cplusplus 32 extern "C" { 33 #endif 34 35 #ifdef _KERNEL 36 37 #include <sys/types.h> 38 #include <sys/machlock.h> 39 #include <sys/thread.h> 40 41 typedef struct waitq { 42 disp_lock_t wq_lock; /* protects all fields */ 43 kthread_t *wq_first; /* first thread on the queue */ 44 int wq_count; /* number of threads on the queue */ 45 boolean_t wq_blocked; /* True if threads can't be enqueued */ 46 } waitq_t; 47 48 extern void waitq_init(waitq_t *); 49 extern void waitq_fini(waitq_t *); 50 51 /* 52 * Place the thread on the wait queue. An attempt to enqueue a thread onto a 53 * blocked queue fails and returns zero. Successful enqueue returns non-zero 54 * value. 55 */ 56 extern int waitq_enqueue(waitq_t *, kthread_t *); 57 58 /* 59 * Take thread off its wait queue and make it runnable. 60 */ 61 extern void waitq_setrun(kthread_t *t); 62 63 /* 64 * Change priority for the thread on wait queue. 65 */ 66 extern void waitq_change_pri(kthread_t *, pri_t); 67 68 /* 69 * Take the first thread off the wait queue and make it runnable. 70 */ 71 extern void waitq_runone(waitq_t *); 72 73 /* 74 * Return True if there are no threads on the queue. 75 */ 76 extern boolean_t waitq_isempty(waitq_t *); 77 78 /* 79 * Prevent and allow placing new threads on wait queue. 80 */ 81 extern void waitq_block(waitq_t *); 82 extern void waitq_unblock(waitq_t *); 83 84 #endif /* _KERNEL */ 85 86 #ifdef __cplusplus 87 } 88 #endif 89 90 #endif /* _SYS_WAITQ_H */ 91