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 (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 #include "lint.h" 30 #include "thr_uberdata.h" 31 #include <pthread.h> 32 33 /* 34 * Implementation-private attribute structure (for extensibility). 35 */ 36 typedef struct { 37 int pshared; 38 } barrierattr_t; 39 40 #pragma weak pthread_barrierattr_init = _pthread_barrierattr_init 41 int 42 _pthread_barrierattr_init(pthread_barrierattr_t *attr) 43 { 44 barrierattr_t *ap; 45 46 if ((ap = lmalloc(sizeof (barrierattr_t))) == NULL) 47 return (ENOMEM); 48 ap->pshared = PTHREAD_PROCESS_PRIVATE; 49 attr->__pthread_barrierattrp = ap; 50 return (0); 51 } 52 53 #pragma weak pthread_barrierattr_destroy = _pthread_barrierattr_destroy 54 int 55 _pthread_barrierattr_destroy(pthread_barrierattr_t *attr) 56 { 57 if (attr == NULL || attr->__pthread_barrierattrp == NULL) 58 return (EINVAL); 59 lfree(attr->__pthread_barrierattrp, sizeof (barrierattr_t)); 60 attr->__pthread_barrierattrp = NULL; 61 return (0); 62 } 63 64 #pragma weak pthread_barrierattr_setpshared = _pthread_barrierattr_setpshared 65 int 66 _pthread_barrierattr_setpshared(pthread_barrierattr_t *attr, int pshared) 67 { 68 barrierattr_t *ap; 69 70 if (attr == NULL || (ap = attr->__pthread_barrierattrp) == NULL || 71 (pshared != PTHREAD_PROCESS_PRIVATE && 72 pshared != PTHREAD_PROCESS_SHARED)) 73 return (EINVAL); 74 ap->pshared = pshared; 75 return (0); 76 } 77 78 #pragma weak pthread_barrierattr_getpshared = _pthread_barrierattr_getpshared 79 int 80 _pthread_barrierattr_getpshared(const pthread_barrierattr_t *attr, int *pshared) 81 { 82 barrierattr_t *ap; 83 84 if (attr == NULL || (ap = attr->__pthread_barrierattrp) == NULL || 85 pshared == NULL) 86 return (EINVAL); 87 *pshared = ap->pshared; 88 return (0); 89 } 90 91 #pragma weak pthread_barrier_init = _pthread_barrier_init 92 int 93 _pthread_barrier_init(pthread_barrier_t *barrier, 94 const pthread_barrierattr_t *attr, uint_t count) 95 { 96 mutex_t *mp = (mutex_t *)&barrier->__pthread_barrier_lock; 97 cond_t *cvp = (cond_t *)&barrier->__pthread_barrier_cond; 98 barrierattr_t *ap; 99 int type; 100 101 if (attr == NULL) 102 type = DEFAULT_TYPE; 103 else if ((ap = attr->__pthread_barrierattrp) != NULL) 104 type = ap->pshared; 105 else 106 type = -1; 107 108 if (count == 0 || 109 (type != PTHREAD_PROCESS_PRIVATE && type != PTHREAD_PROCESS_SHARED)) 110 return (EINVAL); 111 112 barrier->__pthread_barrier_count = count; 113 barrier->__pthread_barrier_current = count; 114 barrier->__pthread_barrier_cycle = 0; 115 barrier->__pthread_barrier_reserved = 0; 116 (void) __mutex_init(mp, type, NULL); 117 (void) _cond_init(cvp, type, NULL); 118 return (0); 119 } 120 121 #pragma weak pthread_barrier_destroy = _pthread_barrier_destroy 122 int 123 _pthread_barrier_destroy(pthread_barrier_t *barrier) 124 { 125 mutex_t *mp = (mutex_t *)&barrier->__pthread_barrier_lock; 126 cond_t *cvp = (cond_t *)&barrier->__pthread_barrier_cond; 127 128 (void) __mutex_destroy(mp); 129 (void) _cond_destroy(cvp); 130 (void) _private_memset(barrier, -1, sizeof (*barrier)); 131 return (0); 132 } 133 134 /* 135 * pthread_barrier_wait() is not a cancellation point; 136 */ 137 #pragma weak pthread_barrier_wait = _pthread_barrier_wait 138 int 139 _pthread_barrier_wait(pthread_barrier_t *barrier) 140 { 141 mutex_t *mp = (mutex_t *)&barrier->__pthread_barrier_lock; 142 cond_t *cvp = (cond_t *)&barrier->__pthread_barrier_cond; 143 uint64_t cycle; 144 int cancel_state; 145 146 (void) __mutex_lock(mp); 147 148 if (--barrier->__pthread_barrier_current == 0) { 149 barrier->__pthread_barrier_cycle++; 150 barrier->__pthread_barrier_current = 151 barrier->__pthread_barrier_count; 152 (void) __mutex_unlock(mp); 153 (void) _cond_broadcast(cvp); 154 return (PTHREAD_BARRIER_SERIAL_THREAD); 155 } 156 157 (void) _pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cancel_state); 158 cycle = barrier->__pthread_barrier_cycle; 159 do { 160 (void) _cond_wait(cvp, mp); 161 } while (cycle == barrier->__pthread_barrier_cycle); 162 (void) _pthread_setcancelstate(cancel_state, NULL); 163 164 (void) __mutex_unlock(mp); 165 return (0); 166 } 167