1 /* 2 * Copyright (C) 2017-2021 THL A29 Limited, a Tencent company. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright notice, this 9 * list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright notice, 11 * this list of conditions and the following disclaimer in the documentation 12 * and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 16 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 17 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR 18 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 19 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 20 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 21 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 23 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 * 25 */ 26 27 #ifndef _FSTACK_SYS_RWLOCK_H_ 28 #define _FSTACK_SYS_RWLOCK_H_ 29 #include_next <sys/rwlock.h> 30 31 #undef rw_init 32 #undef rw_init_flags 33 #undef rw_destroy 34 #undef rw_wowned 35 #undef _rw_wlock 36 #undef _rw_try_wlock 37 #undef _rw_wunlock 38 #undef _rw_rlock 39 #undef _rw_try_rlock 40 #undef _rw_runlock 41 #undef _rw_try_upgrade 42 #undef _rw_downgrade 43 44 #define DO_NOTHING do {} while(0) 45 46 void ff_rw_init_flags(struct lock_object *lo, const char *name, int opts); 47 48 #define rw_init(rw, n) \ 49 rw_init_flags((rw), (n), 0) 50 #define rw_init_flags(rw, n, o) \ 51 ff_rw_init_flags(&(rw)->lock_object, (n), (o)) 52 #define rw_destroy(rw) DO_NOTHING 53 #define rw_wowned(rw) 1 54 #define _rw_wlock(rw, f, l) DO_NOTHING 55 #define _rw_try_wlock(rw, f, l) 1 56 #define _rw_wunlock(rw, f, l) DO_NOTHING 57 #define _rw_rlock(rw, f, l) DO_NOTHING 58 #define _rw_try_rlock(rw, f, l) 1 59 #define _rw_runlock(rw, f, l) DO_NOTHING 60 #define _rw_try_upgrade(rw, f, l) 1 61 #define _rw_downgrade(rw, f, l) DO_NOTHING 62 63 #endif /* _FSTACK_SYS_RWLOCK_H_ */ 64