mirror of
https://github.com/torvalds/linux.git
synced 2024-12-22 19:01:37 +00:00
33 lines
452 B
Plaintext
33 lines
452 B
Plaintext
|
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)
|