1*4882a593SmuzhiyunC Atomic-RMW-ops-are-atomic-WRT-atomic_set
2*4882a593Smuzhiyun
3*4882a593Smuzhiyun(*
4*4882a593Smuzhiyun * Result: Never
5*4882a593Smuzhiyun *
6*4882a593Smuzhiyun * Test that atomic_set() cannot break the atomicity of atomic RMWs.
7*4882a593Smuzhiyun * NOTE: This requires herd7 7.56 or later which supports "(void)expr".
8*4882a593Smuzhiyun *)
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun{
11*4882a593Smuzhiyun	atomic_t v = ATOMIC_INIT(1);
12*4882a593Smuzhiyun}
13*4882a593Smuzhiyun
14*4882a593SmuzhiyunP0(atomic_t *v)
15*4882a593Smuzhiyun{
16*4882a593Smuzhiyun	(void)atomic_add_unless(v, 1, 0);
17*4882a593Smuzhiyun}
18*4882a593Smuzhiyun
19*4882a593SmuzhiyunP1(atomic_t *v)
20*4882a593Smuzhiyun{
21*4882a593Smuzhiyun	atomic_set(v, 0);
22*4882a593Smuzhiyun}
23*4882a593Smuzhiyun
24*4882a593Smuzhiyunexists
25*4882a593Smuzhiyun(v=2)
26