10Sstevel@tonic-gate /* 20Sstevel@tonic-gate * CDDL HEADER START 30Sstevel@tonic-gate * 40Sstevel@tonic-gate * The contents of this file are subject to the terms of the 5*2958Sdr146992 * Common Development and Distribution License (the "License"). 6*2958Sdr146992 * You may not use this file except in compliance with the License. 70Sstevel@tonic-gate * 80Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 90Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 100Sstevel@tonic-gate * See the License for the specific language governing permissions 110Sstevel@tonic-gate * and limitations under the License. 120Sstevel@tonic-gate * 130Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 140Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 150Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 160Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 170Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 180Sstevel@tonic-gate * 190Sstevel@tonic-gate * CDDL HEADER END 200Sstevel@tonic-gate */ 21*2958Sdr146992 220Sstevel@tonic-gate /* 23*2958Sdr146992 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 24*2958Sdr146992 * Use is subject to license terms. 250Sstevel@tonic-gate */ 260Sstevel@tonic-gate 270Sstevel@tonic-gate #ifndef _SYS_CONDVAR_IMPL_H 280Sstevel@tonic-gate #define _SYS_CONDVAR_IMPL_H 290Sstevel@tonic-gate 300Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 310Sstevel@tonic-gate 320Sstevel@tonic-gate /* 330Sstevel@tonic-gate * Implementation-private definitions for condition variables 340Sstevel@tonic-gate */ 350Sstevel@tonic-gate 360Sstevel@tonic-gate #ifndef _ASM 370Sstevel@tonic-gate #include <sys/types.h> 380Sstevel@tonic-gate #include <sys/thread.h> 390Sstevel@tonic-gate #endif /* _ASM */ 400Sstevel@tonic-gate 410Sstevel@tonic-gate #ifdef __cplusplus 420Sstevel@tonic-gate extern "C" { 430Sstevel@tonic-gate #endif 440Sstevel@tonic-gate 450Sstevel@tonic-gate #ifndef _ASM 460Sstevel@tonic-gate 470Sstevel@tonic-gate /* 480Sstevel@tonic-gate * Condtion variables. 490Sstevel@tonic-gate */ 500Sstevel@tonic-gate 510Sstevel@tonic-gate typedef struct _condvar_impl { 520Sstevel@tonic-gate ushort_t cv_waiters; 530Sstevel@tonic-gate } condvar_impl_t; 540Sstevel@tonic-gate 550Sstevel@tonic-gate #define CV_HAS_WAITERS(cvp) (((condvar_impl_t *)(cvp))->cv_waiters != 0) 560Sstevel@tonic-gate 570Sstevel@tonic-gate #endif /* _ASM */ 580Sstevel@tonic-gate 59*2958Sdr146992 60*2958Sdr146992 typedef struct cvwaitlock_s { 61*2958Sdr146992 kmutex_t cvw_lock; 62*2958Sdr146992 kcondvar_t cvw_waiter; 63*2958Sdr146992 int cvw_refcnt; 64*2958Sdr146992 } cvwaitlock_t; 65*2958Sdr146992 66*2958Sdr146992 67*2958Sdr146992 #define CVW_INIT(_c) { \ 68*2958Sdr146992 mutex_init(&(_c)->cvw_lock, NULL, MUTEX_DRIVER, NULL); \ 69*2958Sdr146992 cv_init(&(_c)->cvw_waiter, NULL, CV_DRIVER, NULL); \ 70*2958Sdr146992 (_c)->cvw_refcnt = 0; \ 71*2958Sdr146992 } 72*2958Sdr146992 73*2958Sdr146992 #define CVW_ENTER_READ(_c) { \ 74*2958Sdr146992 mutex_enter(&(_c)->cvw_lock); \ 75*2958Sdr146992 while ((_c)->cvw_refcnt < 0) \ 76*2958Sdr146992 cv_wait(&((_c)->cvw_waiter), &(_c)->cvw_lock); \ 77*2958Sdr146992 (_c)->cvw_refcnt++; \ 78*2958Sdr146992 mutex_exit(&(_c)->cvw_lock); \ 79*2958Sdr146992 } 80*2958Sdr146992 81*2958Sdr146992 #define CVW_ENTER_WRITE(_c) { \ 82*2958Sdr146992 mutex_enter(&(_c)->cvw_lock); \ 83*2958Sdr146992 while ((_c)->cvw_refcnt != 0) \ 84*2958Sdr146992 cv_wait(&((_c)->cvw_waiter), &(_c)->cvw_lock); \ 85*2958Sdr146992 (_c)->cvw_refcnt = -1; \ 86*2958Sdr146992 mutex_exit(&(_c)->cvw_lock); \ 87*2958Sdr146992 } 88*2958Sdr146992 89*2958Sdr146992 #define CVW_EXIT_READ(_c) { \ 90*2958Sdr146992 mutex_enter(&(_c)->cvw_lock); \ 91*2958Sdr146992 ASSERT((_c)->cvw_refcnt > 0); \ 92*2958Sdr146992 if ((--((_c)->cvw_refcnt)) == 0) \ 93*2958Sdr146992 cv_broadcast(&(_c)->cvw_waiter); \ 94*2958Sdr146992 mutex_exit(&(_c)->cvw_lock); \ 95*2958Sdr146992 } 96*2958Sdr146992 97*2958Sdr146992 #define CVW_EXIT_WRITE(_c) { \ 98*2958Sdr146992 mutex_enter(&(_c)->cvw_lock); \ 99*2958Sdr146992 ASSERT((_c)->cvw_refcnt == -1); \ 100*2958Sdr146992 (_c)->cvw_refcnt = 0; \ 101*2958Sdr146992 cv_broadcast(&(_c)->cvw_waiter); \ 102*2958Sdr146992 mutex_exit(&(_c)->cvw_lock); \ 103*2958Sdr146992 } 104*2958Sdr146992 1050Sstevel@tonic-gate #ifdef __cplusplus 1060Sstevel@tonic-gate } 1070Sstevel@tonic-gate #endif 1080Sstevel@tonic-gate 1090Sstevel@tonic-gate #endif /* _SYS_CONDVAR_IMPL_H */ 110