blob: aaf4ff472a5fa7347f8a9c9ae684cca9f1b9da7e (
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
|
/*
* mutex.c
*
* Description:
* This translation unit implements mutual exclusion (mutex) primitives.
*/
#include <errno.h>
#include "pthread.h"
#include "implement.h"
int
pthread_mutex_init(pthread_mutex_t *mutex, const pthread_mutexattr_t *attr)
{
if (mutex == NULL)
{
return EINVAL;
}
/* Create a critical section. */
InitializeCriticalSection(mutex);
return 0;
}
int
pthread_mutex_destroy(pthread_mutex_t *mutex)
{
if (mutex == NULL)
{
return EINVAL;
}
DeleteCriticalSection(mutex);
return 0;
}
int
pthread_mutexattr_init(pthread_mutexattr_t *attr)
{
if (attr == NULL)
{
/* This is disallowed. */
return EINVAL;
}
/* None of the optional attributes are supported yet. */
return 0;
}
int
pthread_mutexattr_destroy(pthread_mutexattr_t *attr)
{
/* Nothing to do. */
return 0;
}
int
pthread_mutex_lock(pthread_mutex_t *mutex)
{
EnterCriticalSection(mutex);
return 0;
}
int
pthread_mutex_unlock(pthread_mutex_t *mutex)
{
LeaveCriticalSection(mutex);
return 0;
}
int
pthread_mutex_trylock(pthread_mutex_t *mutex)
{
/* Typically evaluates to 31. */
int numbits = (sizeof(DWORD) * 8) - 1;
if ((GetVersion() >> numbits) != 1)
{
/* We're not on Windows NT; return ENOSYS. */
return ENOSYS;
}
if (mutex == NULL)
{
return EINVAL;
}
return (TryEnterCriticalSection(mutex) != TRUE) ? EBUSY : 0;
}
|
