usr/src/lib/libc/port/threads/pthr_cond.c

   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
  32 /*
  33  * pthread_condattr_init: allocates the cond attribute object and
  34  * initializes it with the default values.
  35  */
  36 #pragma weak _pthread_condattr_init = pthread_condattr_init
  37 int
  38 pthread_condattr_init(pthread_condattr_t *attr)
  39 {
  40         cvattr_t *ap;
  41
  42         if ((ap = lmalloc(sizeof (cvattr_t))) == NULL)
  43                 return (ENOMEM);
  44         ap->pshared = DEFAULT_TYPE;
  45         ap->clockid = CLOCK_REALTIME;
  46         attr->__pthread_condattrp = ap;
  47         return (0);
  48 }
  49
  50 /*
  51  * pthread_condattr_destroy: frees the cond attribute object and
  52  * invalidates it with NULL value.
  53  */
  54 int
  55 pthread_condattr_destroy(pthread_condattr_t *attr)
  56 {
  57         if (attr == NULL || attr->__pthread_condattrp == NULL)
  58                 return (EINVAL);
  59         lfree(attr->__pthread_condattrp, sizeof (cvattr_t));
  60         attr->__pthread_condattrp = NULL;
  61         return (0);
  62 }
  63
  64 /*
  65  * pthread_condattr_setclock: sets the clockid attribute.
  66  */
  67 int
  68 pthread_condattr_setclock(pthread_condattr_t *attr, clockid_t clock_id)
  69 {
  70         cvattr_t *ap;
  71
  72         if (attr != NULL && (ap = attr->__pthread_condattrp) != NULL &&
  73             (clock_id == CLOCK_REALTIME || clock_id == CLOCK_HIGHRES)) {
  74                 ap->clockid = clock_id;
  75                 return (0);
  76         }
  77         return (EINVAL);
  78 }
  79
  80 /*
  81  * pthread_condattr_getclock: gets the shared attr.
  82  */
  83 int
  84 pthread_condattr_getclock(const pthread_condattr_t *attr, clockid_t *clock_id)
  85 {
  86         cvattr_t *ap;
  87
  88         if (attr != NULL && (ap = attr->__pthread_condattrp) != NULL &&
  89             clock_id != NULL) {
  90                 *clock_id = ap->clockid;
  91                 return (0);
  92         }
  93         return (EINVAL);
  94 }
  95
  96
  97 /*
  98  * pthread_condattr_setpshared: sets the shared attr to PRIVATE or SHARED.
  99  * This is equivalent to setting USYNC_PROCESS/USYNC_THREAD flag in cond_init().
 100  */
 101 int
 102 pthread_condattr_setpshared(pthread_condattr_t *attr, int pshared)
 103 {
 104         cvattr_t *ap;
 105
 106         if (attr != NULL && (ap = attr->__pthread_condattrp) != NULL &&
 107             (pshared == PTHREAD_PROCESS_PRIVATE ||
 108             pshared == PTHREAD_PROCESS_SHARED)) {
 109                 ap->pshared = pshared;
 110                 return (0);
 111         }
 112         return (EINVAL);
 113 }
 114
 115 /*
 116  * pthread_condattr_getpshared: gets the shared attr.
 117  */
 118 #pragma weak _pthread_condattr_getpshared = pthread_condattr_getpshared
 119 int
 120 pthread_condattr_getpshared(const pthread_condattr_t *attr, int *pshared)
 121 {
 122         cvattr_t *ap;
 123
 124         if (attr != NULL && (ap = attr->__pthread_condattrp) != NULL &&
 125             pshared != NULL) {
 126                 *pshared = ap->pshared;
 127                 return (0);
 128         }
 129         return (EINVAL);
 130 }
 131
 132 /*
 133  * pthread_cond_init: Initializes the cond object. It copies the
 134  * pshared attr into type argument and calls cond_init().
 135  */
 136 #pragma weak _pthread_cond_init = pthread_cond_init
 137 int
 138 pthread_cond_init(pthread_cond_t *cond, const pthread_condattr_t *attr)
 139 {
 140         cvattr_t *ap;
 141         int type;
 142         clockid_t clock_id;
 143         int error;
 144
 145         if (attr == NULL) {
 146                 type = DEFAULT_TYPE;
 147                 clock_id = CLOCK_REALTIME;
 148         } else if ((ap = attr->__pthread_condattrp) != NULL) {
 149                 type = ap->pshared;
 150                 clock_id = ap->clockid;
 151         } else {
 152                 return (EINVAL);
 153         }
 154
 155         if (clock_id != CLOCK_REALTIME && clock_id != CLOCK_HIGHRES)
 156                 error = EINVAL;
 157         else if ((error = cond_init((cond_t *)cond, type, NULL)) == 0)
 158                 ((cond_t *)cond)->cond_clockid = (uint8_t)clock_id;
 159
 160         return (error);
 161 }