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C IRIW+poonceonces+OnceOnce
(*
* Result: Sometimes
*
* Test of independent reads from independent writes with nothing
* between each pairs of reads. In other words, is anything at all
* needed to cause two different reading processes to agree on the order
* of a pair of writes, where each write is to a different variable by a
* different process?
*)
{}
P0(int *x)
{
WRITE_ONCE(*x, 1);
}
P1(int *x, int *y)
{
int r0;
int r1;
r0 = READ_ONCE(*x);
r1 = READ_ONCE(*y);
}
P2(int *y)
{
WRITE_ONCE(*y, 1);
}
P3(int *x, int *y)
{
int r0;
int r1;
r0 = READ_ONCE(*y);
r1 = READ_ONCE(*x);
}
exists (1:r0=1 /\ 1:r1=0 /\ 3:r0=1 /\ 3:r1=0)
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