tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1C R+poonceonces
2
3(*
4 * Result: Sometimes
5 *
6 * This is the unordered (thus lacking smp_mb()) version of one of the
7 * classic counterintuitive litmus tests that illustrates the effects of
8 * store propagation delays.
9 *)
10
11{}
12
13P0(int *x, int *y)
14{
15 WRITE_ONCE(*x, 1);
16 WRITE_ONCE(*y, 1);
17}
18
19P1(int *x, int *y)
20{
21 int r0;
22
23 WRITE_ONCE(*y, 2);
24 r0 = READ_ONCE(*x);
25}
26
27exists (y=2 /\ 1:r0=0)