blob: 07e75b18729ea4c72972201711ab76736b5ca618 (
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
|
/*
* mutex3.c
*
* Declare a static mutex object, lock it, trylock it,
* and then unlock it again.
*
* Depends on API functions:
* pthread_mutex_lock()
* pthread_mutex_trylock()
* pthread_mutex_unlock()
*/
#include "test.h"
pthread_mutex_t mutex1 = PTHREAD_MUTEX_INITIALIZER;
static int washere = 0;
void * func(void * arg)
{
assert(pthread_mutex_trylock(&mutex1) == EBUSY);
washere = 1;
return 0;
}
int
main()
{
pthread_t t;
assert(pthread_mutex_lock(&mutex1) == 0);
assert(pthread_create(&t, NULL, func, NULL) == 0);
assert(pthread_join(t, NULL) == 0);
assert(pthread_mutex_unlock(&mutex1) == 0);
assert(washere == 1);
return 0;
}
|
