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, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2003 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #ifndef _SYS_TURNSTILE_H 28 #define _SYS_TURNSTILE_H 29 30 #include <sys/types.h> 31 #include <sys/time.h> 32 #include <sys/param.h> 33 #include <sys/sleepq.h> 34 #include <sys/mutex.h> 35 #include <sys/lwp_timer_impl.h> 36 37 #ifdef __cplusplus 38 extern "C" { 39 #endif 40 41 #define TS_WRITER_Q 0 /* writer sleepq (exclusive access to sobj) */ 42 #define TS_READER_Q 1 /* reader sleepq (shared access to sobj) */ 43 #define TS_NUM_Q 2 /* number of sleep queues per turnstile */ 44 45 typedef struct turnstile turnstile_t; 46 struct _sobj_ops; 47 48 struct turnstile { 49 turnstile_t *ts_next; /* next on hash chain */ 50 turnstile_t *ts_free; /* next on freelist */ 51 void *ts_sobj; /* s-object threads are blocking on */ 52 int ts_waiters; /* number of blocked threads */ 53 pri_t ts_epri; /* max priority of blocked threads */ 54 struct _kthread *ts_inheritor; /* thread inheriting priority */ 55 turnstile_t *ts_prioinv; /* next in inheritor's t_prioinv list */ 56 sleepq_t ts_sleepq[TS_NUM_Q]; /* read/write sleep queues */ 57 }; 58 59 #ifdef _KERNEL 60 61 extern turnstile_t *turnstile_lookup(void *); 62 extern void turnstile_exit(void *); 63 extern int turnstile_block(turnstile_t *, int, void *, struct _sobj_ops *, 64 kmutex_t *, lwp_timer_t *); 65 extern void turnstile_wakeup(turnstile_t *, int, int, struct _kthread *); 66 extern void turnstile_change_pri(struct _kthread *, pri_t, pri_t *); 67 extern void turnstile_unsleep(struct _kthread *); 68 extern void turnstile_stay_asleep(struct _kthread *); 69 extern void turnstile_pi_recalc(void); 70 71 #endif /* _KERNEL */ 72 73 #ifdef __cplusplus 74 } 75 #endif 76 77 #endif /* _SYS_TURNSTILE_H */ 78