blob: cdbd21ef949100ee582747d502ed4fca76ec9686 (
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
|
#ifndef _ATOMIC_H_
#define _ATOMIC_H_
#include <stdlib.h>
#include <pthread.h>
#include <util.h>
typedef int refcnt;
static inline void refcnt_inc(refcnt *cnt)
{
__sync_add_and_fetch(cnt, 1);
}
static inline refcnt refcnt_dec(refcnt *cnt)
{
return __sync_sub_and_fetch(cnt, 1);
}
typedef pthread_mutex_t lock;
static inline void lock_init(lock *l)
{
pthread_mutex_init(l, NULL);
}
static inline void lock_acquire(lock *l)
{
int ret = pthread_mutex_lock(l);
if (ret < 0) {
switch (ret) {
case EINVAL:
pr_err("invalid mutex\n");
exit(1);
case EDEADLK:
pr_err("a deadlock would occur\n");
exit(1);
}
}
}
static inline void lock_release(lock *l)
{
int ret = pthread_mutex_unlock(l);
if (ret < 0) {
switch (ret) {
case EINVAL:
pr_err("invalid mutex\n");
exit(1);
case EPERM:
pr_err("this thread does not hold this mutex\n");
exit(1);
}
}
}
static inline void lock_release_via_cleanup(void *l)
{
lock_release(l);
}
#define LOCK_ACQUIRE_THREAD(l) \
lock_acquire(l); \
pthread_cleanup_push(lock_release_via_cleanup, l)
#define LOCK_RELEASE_THREAD(l) \
pthread_cleanup_pop(1)
#endif /* _ATOMIC_H_ */
|
