1 /* 2 * Copyright (c) 2000 Jake Burkholder <[email protected]>.All rights reserved. 3 * Copyright (c) 2010 Kip Macy All rights reserved. 4 * Copyright (c) 2013 Patrick Kelsey. All rights reserved. 5 * Copyright (C) 2017-2021 THL A29 Limited, a Tencent company. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright notice, this 12 * list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright notice, 14 * this list of conditions and the following disclaimer in the documentation 15 * and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 20 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR 21 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 26 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 * 28 */ 29 30 #ifndef _FSTACK_SYS_CONDVAR_H_ 31 #define _FSTACK_SYS_CONDVAR_H_ 32 33 #ifndef LOCORE 34 #include <sys/queue.h> 35 36 #include "ff_host_interface.h" 37 38 struct lock_object; 39 struct thread; 40 41 TAILQ_HEAD(cv_waitq, thread); 42 43 /* 44 * Condition variable. The waiters count is protected by the mutex that 45 * protects the condition; that is, the mutex that is passed to cv_wait*() 46 * and is held across calls to cv_signal() and cv_broadcast(). It is an 47 * optimization to avoid looking up the sleep queue if there are no waiters. 48 */ 49 struct cv { 50 const char *cv_description; 51 ff_cond_t cv_cond; 52 }; 53 54 #ifdef _KERNEL 55 void cv_init(struct cv *cvp, const char *desc); 56 void cv_destroy(struct cv *cvp); 57 58 void _cv_wait(struct cv *cvp, struct lock_object *lock); 59 void _cv_wait_unlock(struct cv *cvp, struct lock_object *lock); 60 int _cv_wait_sig(struct cv *cvp, struct lock_object *lock); 61 int _cv_timedwait(struct cv *cvp, struct lock_object *lock, int timo); 62 int _cv_timedwait_sig(struct cv *cvp, struct lock_object *lock, int timo); 63 int _cv_timedwait_sig_sbt(struct cv *cvp, struct lock_object *lock, 64 sbintime_t sbt, sbintime_t pr, int flags); 65 66 void cv_signal(struct cv *cvp); 67 void cv_broadcastpri(struct cv *cvp, int pri); 68 69 #define cv_wait(cvp, lock) \ 70 _cv_wait((cvp), &(lock)->lock_object) 71 #define cv_wait_unlock(cvp, lock) \ 72 _cv_wait_unlock((cvp), &(lock)->lock_object) 73 #define cv_wait_sig(cvp, lock) \ 74 _cv_wait_sig((cvp), &(lock)->lock_object) 75 #define cv_timedwait(cvp, lock, timo) \ 76 _cv_timedwait((cvp), &(lock)->lock_object, (timo)) 77 #define cv_timedwait_sig(cvp, lock, timo) \ 78 _cv_timedwait_sig((cvp), &(lock)->lock_object, (timo)) 79 #define cv_timedwait_sig_sbt(cvp, lock, sbt, pr, flags) \ 80 _cv_timedwait_sig_sbt((cvp), &(lock)->lock_object, (sbt), (pr), (flags)) 81 82 #define cv_broadcast(cvp) cv_broadcastpri(cvp, 0) 83 84 #define cv_wmesg(cvp) ((cvp)->cv_description) 85 86 #endif /* _KERNEL */ 87 #endif /* !LOCORE */ 88 #endif /* _FSTACK_SYS_CONDVAR_H_ */ 89