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
|
#include <pthread.h>
#include <stdio.h>
pthread_key_t key;
pthread_once_t key_once = PTHREAD_ONCE_INIT;
void
destroy_key(void * arg)
{
/* arg is not NULL if we get to here. */
printf("SUCCESS: %s: destroying key.\n", (char *) arg);
free((char *) arg);
/* Is it our responsibility to do this? */
arg = NULL;
}
void
make_key(void)
{
if (pthread_key_create(&key, destroy_key) != 0)
{
printf("Key create failed\n");
exit(1);
}
}
void *
mythread(void * arg)
{
void * ptr;
(void) pthread_once(&key_once, make_key);
if ((ptr = pthread_getspecific(key)) != NULL)
{
printf("ERROR: Thread %d, Key 0x%x not initialised to NULL\n",
(int) arg,
(int) key);
exit(1);
}
else
{
ptr = (void *) malloc(80);
sprintf((char *) ptr, "Thread %d Key 0x%x",
(int) arg,
(int) key);
(void) pthread_setspecific(key, ptr);
}
if ((ptr = pthread_getspecific(key)) == NULL)
{
printf("FAILED: Thread %d Key 0x%x: key value set or get failed.\n",
(int) arg,
(int) key);
exit(1);
}
else
{
printf("SUCCESS: Thread %d Key 0x%x: key value set and get succeeded.\n",
(int) arg,
(int) key);
printf("SUCCESS: %s: exiting thread.\n", (char *) ptr);
}
return 0;
/* Exiting the thread will call the key destructor. */
}
int
main()
{
int rc;
pthread_t t1, t2;
rc = pthread_create(&t1, NULL, mythread, (void *) 1);
printf("pthread_create returned %d\n", rc);
rc = pthread_create(&t2, NULL, mythread, (void *) 2);
printf("pthread_create returned %d\n", rc);
Sleep(2000);
return 0;
}
|
