xref: /illumos-gate/usr/src/lib/libc/port/threads/pthr_cond.c (revision a90d75b828f0c01a350c4ecfc3924fd6456fffaf)
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 #include "lint.h"
28 #include "thr_uberdata.h"
29 
30 /*
31  * pthread_condattr_init: allocates the cond attribute object and
32  * initializes it with the default values.
33  */
34 #pragma weak _pthread_condattr_init = pthread_condattr_init
35 int
pthread_condattr_init(pthread_condattr_t * attr)36 pthread_condattr_init(pthread_condattr_t *attr)
37 {
38 	cvattr_t *ap;
39 
40 	if ((ap = lmalloc(sizeof (cvattr_t))) == NULL)
41 		return (ENOMEM);
42 	ap->pshared = PTHREAD_PROCESS_PRIVATE;
43 	ap->clockid = CLOCK_REALTIME;
44 	attr->__pthread_condattrp = ap;
45 	return (0);
46 }
47 
48 /*
49  * pthread_condattr_destroy: frees the cond attribute object and
50  * invalidates it with NULL value.
51  */
52 int
pthread_condattr_destroy(pthread_condattr_t * attr)53 pthread_condattr_destroy(pthread_condattr_t *attr)
54 {
55 	if (attr == NULL || attr->__pthread_condattrp == NULL)
56 		return (EINVAL);
57 	lfree(attr->__pthread_condattrp, sizeof (cvattr_t));
58 	attr->__pthread_condattrp = NULL;
59 	return (0);
60 }
61 
62 /*
63  * pthread_condattr_setclock: sets the clockid attribute.
64  */
65 int
pthread_condattr_setclock(pthread_condattr_t * attr,clockid_t clock_id)66 pthread_condattr_setclock(pthread_condattr_t *attr, clockid_t clock_id)
67 {
68 	cvattr_t *ap;
69 
70 	if (attr != NULL && (ap = attr->__pthread_condattrp) != NULL &&
71 	    (clock_id == CLOCK_REALTIME || clock_id == CLOCK_HIGHRES)) {
72 		ap->clockid = clock_id;
73 		return (0);
74 	}
75 	return (EINVAL);
76 }
77 
78 /*
79  * pthread_condattr_getclock: gets the shared attr.
80  */
81 int
pthread_condattr_getclock(const pthread_condattr_t * attr,clockid_t * clock_id)82 pthread_condattr_getclock(const pthread_condattr_t *attr, clockid_t *clock_id)
83 {
84 	cvattr_t *ap;
85 
86 	if (attr != NULL && (ap = attr->__pthread_condattrp) != NULL &&
87 	    clock_id != NULL) {
88 		*clock_id = ap->clockid;
89 		return (0);
90 	}
91 	return (EINVAL);
92 }
93 
94 
95 /*
96  * pthread_condattr_setpshared: sets the shared attr to PRIVATE or SHARED.
97  * This is equivalent to setting USYNC_PROCESS/USYNC_THREAD flag in cond_init().
98  */
99 int
pthread_condattr_setpshared(pthread_condattr_t * attr,int pshared)100 pthread_condattr_setpshared(pthread_condattr_t *attr, int pshared)
101 {
102 	cvattr_t *ap;
103 
104 	if (attr != NULL && (ap = attr->__pthread_condattrp) != NULL &&
105 	    (pshared == PTHREAD_PROCESS_PRIVATE ||
106 	    pshared == PTHREAD_PROCESS_SHARED)) {
107 		ap->pshared = pshared;
108 		return (0);
109 	}
110 	return (EINVAL);
111 }
112 
113 /*
114  * pthread_condattr_getpshared: gets the shared attr.
115  */
116 #pragma weak _pthread_condattr_getpshared = pthread_condattr_getpshared
117 int
pthread_condattr_getpshared(const pthread_condattr_t * attr,int * pshared)118 pthread_condattr_getpshared(const pthread_condattr_t *attr, int *pshared)
119 {
120 	cvattr_t *ap;
121 
122 	if (attr != NULL && (ap = attr->__pthread_condattrp) != NULL &&
123 	    pshared != NULL) {
124 		*pshared = ap->pshared;
125 		return (0);
126 	}
127 	return (EINVAL);
128 }
129 
130 /*
131  * pthread_cond_init: Initializes the cond object. It copies the
132  * pshared attr into type argument and calls cond_init().
133  */
134 #pragma weak _pthread_cond_init = pthread_cond_init
135 int
pthread_cond_init(pthread_cond_t * cond,const pthread_condattr_t * attr)136 pthread_cond_init(pthread_cond_t *cond, const pthread_condattr_t *attr)
137 {
138 	cvattr_t *ap;
139 	int type;
140 	clockid_t clock_id;
141 	int error;
142 
143 	if (attr == NULL) {
144 		type = PTHREAD_PROCESS_PRIVATE;
145 		clock_id = CLOCK_REALTIME;
146 	} else if ((ap = attr->__pthread_condattrp) != NULL) {
147 		type = ap->pshared;
148 		clock_id = ap->clockid;
149 	} else {
150 		return (EINVAL);
151 	}
152 
153 	if (clock_id != CLOCK_REALTIME && clock_id != CLOCK_HIGHRES)
154 		error = EINVAL;
155 	else if ((error = cond_init((cond_t *)cond, type, NULL)) == 0)
156 		((cond_t *)cond)->cond_clockid = (uint8_t)clock_id;
157 
158 	return (error);
159 }
160