db_syncobj.c revision 1.2.2.2
1 1.2.2.2 martin /* $NetBSD: db_syncobj.c,v 1.2.2.2 2023/08/09 17:42:03 martin Exp $ */ 2 1.2.2.2 martin 3 1.2.2.2 martin /*- 4 1.2.2.2 martin * Copyright (c) 2023 The NetBSD Foundation, Inc. 5 1.2.2.2 martin * All rights reserved. 6 1.2.2.2 martin * 7 1.2.2.2 martin * Redistribution and use in source and binary forms, with or without 8 1.2.2.2 martin * modification, are permitted provided that the following conditions 9 1.2.2.2 martin * are met: 10 1.2.2.2 martin * 1. Redistributions of source code must retain the above copyright 11 1.2.2.2 martin * notice, this list of conditions and the following disclaimer. 12 1.2.2.2 martin * 2. Redistributions in binary form must reproduce the above copyright 13 1.2.2.2 martin * notice, this list of conditions and the following disclaimer in the 14 1.2.2.2 martin * documentation and/or other materials provided with the distribution. 15 1.2.2.2 martin * 16 1.2.2.2 martin * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 1.2.2.2 martin * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 1.2.2.2 martin * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 1.2.2.2 martin * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 1.2.2.2 martin * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 1.2.2.2 martin * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 1.2.2.2 martin * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 1.2.2.2 martin * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 1.2.2.2 martin * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 1.2.2.2 martin * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 1.2.2.2 martin * POSSIBILITY OF SUCH DAMAGE. 27 1.2.2.2 martin */ 28 1.2.2.2 martin 29 1.2.2.2 martin #define __MUTEX_PRIVATE 30 1.2.2.2 martin #define __RWLOCK_PRIVATE 31 1.2.2.2 martin 32 1.2.2.2 martin #include <sys/cdefs.h> 33 1.2.2.2 martin __KERNEL_RCSID(0, "$NetBSD: db_syncobj.c,v 1.2.2.2 2023/08/09 17:42:03 martin Exp $"); 34 1.2.2.2 martin 35 1.2.2.2 martin #include <sys/types.h> 36 1.2.2.2 martin 37 1.2.2.2 martin #include <sys/mutex.h> 38 1.2.2.2 martin #include <sys/null.h> 39 1.2.2.2 martin #include <sys/rwlock.h> 40 1.2.2.2 martin #include <sys/syncobj.h> 41 1.2.2.2 martin 42 1.2.2.2 martin #include <ddb/ddb.h> 43 1.2.2.2 martin 44 1.2.2.2 martin struct lwp * 45 1.2.2.2 martin db_syncobj_owner(struct syncobj *sobj, wchan_t wchan) 46 1.2.2.2 martin { 47 1.2.2.2 martin db_expr_t mutex_syncobj_; 48 1.2.2.2 martin db_expr_t rw_syncobj_; 49 1.2.2.2 martin 50 1.2.2.2 martin if (db_value_of_name("mutex_syncobj", &mutex_syncobj_) && 51 1.2.2.2 martin (db_expr_t)(uintptr_t)sobj == mutex_syncobj_) { 52 1.2.2.2 martin volatile const struct kmutex *mtx = wchan; 53 1.2.2.2 martin uintptr_t owner; 54 1.2.2.2 martin 55 1.2.2.2 martin db_read_bytes((db_addr_t)&mtx->mtx_owner, sizeof(owner), 56 1.2.2.2 martin (char *)&owner); 57 1.2.2.2 martin return (struct lwp *)(owner & MUTEX_THREAD); 58 1.2.2.2 martin 59 1.2.2.2 martin } else if (db_value_of_name("rw_syncobj", &rw_syncobj_) && 60 1.2.2.2 martin (db_expr_t)(uintptr_t)sobj == rw_syncobj_) { 61 1.2.2.2 martin volatile const struct krwlock *rw = wchan; 62 1.2.2.2 martin uintptr_t owner; 63 1.2.2.2 martin 64 1.2.2.2 martin db_read_bytes((db_addr_t)&rw->rw_owner, sizeof(owner), 65 1.2.2.2 martin (char *)&owner); 66 1.2.2.2 martin if (owner & RW_WRITE_LOCKED) 67 1.2.2.2 martin return (struct lwp *)(owner & RW_THREAD); 68 1.2.2.2 martin return NULL; 69 1.2.2.2 martin 70 1.2.2.2 martin } else { 71 1.2.2.2 martin return NULL; 72 1.2.2.2 martin } 73 1.2.2.2 martin } 74
Indexes created Tue Sep 30 20:09:53 GMT 2025