1# 1 "files/mutex_lock_struct.c"
2# 1 "<built-in>"
3# 1 "<command-line>"
4# 1 "files/mutex_lock_struct.c"
5
6
7
8
9
10
11
12
13
14void err()
15{ ERROR: goto ERROR; }
16
17struct mutex {
18 int is_locked;
19};
20
21void mutex_lock(struct mutex *a)
22{
23 if (a->is_locked == 1) err();
24 a->is_locked = 1;
25}
26
27void mutex_unlock(struct mutex *b)
28{
29 if (b->is_locked != 1) err();
30 b->is_locked = 0;
31}
32
33int main()
34{
35 struct mutex m;
36 m.is_locked = 0;
37
38 mutex_lock(&m);
39
40 mutex_unlock(&m);
41
42
43
44
45}