1 /* 2 * Copyright (c) 1997 John Birrell <jb@cimlogic.com.au>. 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 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by John Birrell. 16 * 4. Neither the name of the author nor the names of any co-contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * $FreeBSD$ 33 * 34 */ 35 36 #include <stdlib.h> 37 #include <stdio.h> 38 #include <string.h> 39 #include <sched.h> 40 #include <pthread.h> 41 #include <unistd.h> 42 43 #include <libc_private.h> 44 45 #include "thr_private.h" 46 47 void 48 _spinunlock(spinlock_t *lck) 49 { 50 if (umtx_unlock((struct umtx *)lck, curthread->thr_id)) 51 abort(); 52 } 53 54 /* 55 * Lock a location for the running thread. Yield to allow other 56 * threads to run if this thread is blocked because the lock is 57 * not available. Note that this function does not sleep. It 58 * assumes that the lock will be available very soon. 59 */ 60 void 61 _spinlock(spinlock_t *lck) 62 { 63 if (umtx_lock((struct umtx *)lck, curthread->thr_id)) 64 abort(); 65 } 66 67 int 68 _spintrylock(spinlock_t *lck) 69 { 70 int error; 71 72 error = umtx_lock((struct umtx *)lck, curthread->thr_id); 73 if (error != 0 && error != EBUSY) 74 abort(); 75 return (error); 76 } 77 78 /* 79 * Lock a location for the running thread. Yield to allow other 80 * threads to run if this thread is blocked because the lock is 81 * not available. Note that this function does not sleep. It 82 * assumes that the lock will be available very soon. 83 * 84 * This function checks if the running thread has already locked the 85 * location, warns if this occurs and creates a thread dump before 86 * returning. 87 */ 88 void 89 _spinlock_debug(spinlock_t *lck, char *fname, int lineno) 90 { 91 if (umtx_lock((struct umtx *)lck, curthread->thr_id)) 92 abort(); 93 } 94