summaryrefslogtreecommitdiffstats
path: root/tools/memory-model/litmus-tests/SB+rfionceonce-poonceonces.litmus
blob: 04a16603660bd29716912acb18d03e894f3a73f3 (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
C SB+rfionceonce-poonceonces

(*
 * Result: Sometimes
 *
 * This litmus test demonstrates that LKMM is not fully multicopy atomic.
 *)

{}

P0(int *x, int *y)
{
	int r1;
	int r2;

	WRITE_ONCE(*x, 1);
	r1 = READ_ONCE(*x);
	r2 = READ_ONCE(*y);
}

P1(int *x, int *y)
{
	int r3;
	int r4;

	WRITE_ONCE(*y, 1);
	r3 = READ_ONCE(*y);
	r4 = READ_ONCE(*x);
}

locations [0:r1; 1:r3; x; y] (* Debug aid: Print things not in "exists". *)
exists (0:r2=0 /\ 1:r4=0)