tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1C SB+poonceonces
2
3(*
4 * Result: Sometimes
5 *
6 * This litmus test demonstrates that at least some ordering is required
7 * to order the store-buffering pattern, where each process writes to the
8 * variable that the preceding process reads.
9 *)
10
11{}
12
13P0(int *x, int *y)
14{
15 int r0;
16
17 WRITE_ONCE(*x, 1);
18 r0 = READ_ONCE(*y);
19}
20
21P1(int *x, int *y)
22{
23 int r0;
24
25 WRITE_ONCE(*y, 1);
26 r0 = READ_ONCE(*x);
27}
28
29exists (0:r0=0 /\ 1:r0=0)