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1 /*
2  * pthread_rwlock_init.c
3  *
4  * Description:
5  * This translation unit implements read/write lock primitives.
6  *
7  * --------------------------------------------------------------------------
8  *
9  *      Pthreads-win32 - POSIX Threads Library for Win32
10  *      Copyright(C) 1998 John E. Bossom
11  *      Copyright(C) 1999,2002 Pthreads-win32 contributors
12  * 
13  *      Contact Email: rpj@ise.canberra.edu.au
14  * 
15  *      The current list of contributors is contained
16  *      in the file CONTRIBUTORS included with the source
17  *      code distribution. The list can also be seen at the
18  *      following World Wide Web location:
19  *      http://sources.redhat.com/pthreads-win32/contributors.html
20  * 
21  *      This library is free software; you can redistribute it and/or
22  *      modify it under the terms of the GNU Lesser General Public
23  *      License as published by the Free Software Foundation; either
24  *      version 2 of the License, or (at your option) any later version.
25  * 
26  *      This library is distributed in the hope that it will be useful,
27  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
28  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
29  *      Lesser General Public License for more details.
30  * 
31  *      You should have received a copy of the GNU Lesser General Public
32  *      License along with this library in the file COPYING.LIB;
33  *      if not, write to the Free Software Foundation, Inc.,
34  *      59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
35  */
36
37 //#include <errno.h>
38 //#include <limits.h>
39
40 //#include "pthread.h"
41 //#include "implement.h"
42
43 #include "orte.h"
44
45 int
46 pthread_rwlock_init(pthread_rwlock_t *rwlock, const pthread_rwlockattr_t *attr)
47 {
48     int result;
49     pthread_rwlock_t rwl = 0;
50
51     if (rwlock == NULL)
52       {
53         return EINVAL;
54       }
55
56     if (attr != NULL && *attr != NULL)
57       {
58         result = EINVAL; /* Not supported */
59         goto DONE;
60       }
61
62     rwl = (pthread_rwlock_t) calloc(1, sizeof(*rwl));
63
64     if (rwl == NULL)
65       {
66         result = ENOMEM;
67         goto DONE;
68       }
69
70     rwl->nSharedAccessCount = 0;
71     rwl->nExclusiveAccessCount = 0;
72     rwl->nCompletedSharedAccessCount = 0;
73
74     result = pthread_mutex_init(&rwl->mtxExclusiveAccess, NULL);
75     if (result != 0)
76       {
77         goto FAIL0;
78       }
79
80     result = pthread_mutex_init(&rwl->mtxSharedAccessCompleted, NULL);
81     if (result != 0)
82       {
83         goto FAIL1;
84       }
85
86     result = pthread_cond_init(&rwl->cndSharedAccessCompleted, NULL);
87     if (result != 0)
88       {
89         goto FAIL2;
90       }
91
92     rwl->nMagic = PTW32_RWLOCK_MAGIC;
93
94     result = 0;
95     goto DONE;
96
97 FAIL2:
98     (void) pthread_mutex_destroy(&(rwl->mtxSharedAccessCompleted));
99
100 FAIL1:
101     (void) pthread_mutex_destroy(&(rwl->mtxExclusiveAccess));
102
103 FAIL0:
104     (void) free(rwl);
105     rwl = NULL;
106
107 DONE:
108     *rwlock = rwl;
109
110     return result;
111 }