xref: /OK3568_Linux_fs/kernel/tools/memory-model/litmus-tests/LB+poacquireonce+pooncerelease.litmus (revision 4882a59341e53eb6f0b4789bf948001014eff981) 
1*4882a593SmuzhiyunC LB+poacquireonce+pooncerelease
2*4882a593Smuzhiyun
3*4882a593Smuzhiyun(*
4*4882a593Smuzhiyun * Result: Never
5*4882a593Smuzhiyun *
6*4882a593Smuzhiyun * Does a release-acquire pair suffice for the load-buffering litmus
7*4882a593Smuzhiyun * test, where each process reads from one of two variables then writes
8*4882a593Smuzhiyun * to the other?
9*4882a593Smuzhiyun *)
10*4882a593Smuzhiyun
11*4882a593Smuzhiyun{}
12*4882a593Smuzhiyun
13*4882a593SmuzhiyunP0(int *x, int *y)
14*4882a593Smuzhiyun{
15*4882a593Smuzhiyun	int r0;
16*4882a593Smuzhiyun
17*4882a593Smuzhiyun	r0 = READ_ONCE(*x);
18*4882a593Smuzhiyun	smp_store_release(y, 1);
19*4882a593Smuzhiyun}
20*4882a593Smuzhiyun
21*4882a593SmuzhiyunP1(int *x, int *y)
22*4882a593Smuzhiyun{
23*4882a593Smuzhiyun	int r0;
24*4882a593Smuzhiyun
25*4882a593Smuzhiyun	r0 = smp_load_acquire(y);
26*4882a593Smuzhiyun	WRITE_ONCE(*x, 1);
27*4882a593Smuzhiyun}
28*4882a593Smuzhiyun
29*4882a593Smuzhiyunexists (0:r0=1 /\ 1:r0=1)
30