blob: b49da6c3c90b174637445e603313e635801e80e1 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
|
/*
* pthread_spin_init.c
*
* Description:
* This translation unit implements spin lock primitives.
*
* --------------------------------------------------------------------------
*
* Pthreads4w - POSIX Threads Library for Win32
* Copyright(C) 1998 John E. Bossom
* Copyright(C) 1999-2018, Pthreads4w contributors
*
* Homepage: https://sourceforge.net/projects/pthreads4w/
*
* The current list of contributors is contained
* in the file CONTRIBUTORS included with the source
* code distribution. The list can also be seen at the
* following World Wide Web location:
* https://sourceforge.net/p/pthreads4w/wiki/Contributors/
*
* This file is part of Pthreads4w.
*
* Pthreads4w is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Pthreads4w is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Pthreads4w. If not, see <http://www.gnu.org/licenses/>. *
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include "pthread.h"
#include "implement.h"
int
pthread_spin_init (pthread_spinlock_t * lock, int pshared)
{
pthread_spinlock_t s;
int cpus = 0;
int result = 0;
if (lock == NULL)
{
return EINVAL;
}
if (0 != ptw32_getprocessors (&cpus))
{
cpus = 1;
}
if (cpus > 1)
{
if (pshared == PTHREAD_PROCESS_SHARED)
{
/*
* Creating spinlock that can be shared between
* processes.
*/
#if _POSIX_THREAD_PROCESS_SHARED >= 0
/*
* Not implemented yet.
*/
#error ERROR [__FILE__, line __LINE__]: Process shared spin locks are not supported yet.
#else
return ENOSYS;
#endif /* _POSIX_THREAD_PROCESS_SHARED */
}
}
s = (pthread_spinlock_t) calloc (1, sizeof (*s));
if (s == NULL)
{
return ENOMEM;
}
if (cpus > 1)
{
s->u.cpus = cpus;
s->interlock = PTW32_SPIN_UNLOCKED;
}
else
{
pthread_mutexattr_t ma;
result = pthread_mutexattr_init (&ma);
if (0 == result)
{
ma->pshared = pshared;
result = pthread_mutex_init (&(s->u.mutex), &ma);
if (0 == result)
{
s->interlock = PTW32_SPIN_USE_MUTEX;
}
}
(void) pthread_mutexattr_destroy (&ma);
}
if (0 == result)
{
*lock = s;
}
else
{
(void) free (s);
*lock = NULL;
}
return (result);
}
|
