41 lines
588 B
Plaintext
41 lines
588 B
Plaintext
|
C ISA2+pooncelock+pooncelock+pombonce
|
||
|
|
|
||
|
|
(*
|
||
|
|
* Result: Never
|
||
|
|
*
|
||
|
|
* This test shows that write-write ordering provided by locks
|
||
|
|
* (in P0() and P1()) is visible to external process P2().
|
||
|
|
*)
|
||
|
|
|
||
|
|
{}
|
||
|
|
|
||
|
|
P0(int *x, int *y, spinlock_t *mylock)
|
||
|
|
{
|
||
|
|
spin_lock(mylock);
|
||
|
|
WRITE_ONCE(*x, 1);
|
||
|
|
WRITE_ONCE(*y, 1);
|
||
|
|
spin_unlock(mylock);
|
||
|
|
}
|
||
|
|
|
||
|
|
P1(int *y, int *z, spinlock_t *mylock)
|
||
|
|
{
|
||
|
|
int r0;
|
||
|
|
|
||
|
|
spin_lock(mylock);
|
||
|
|
r0 = READ_ONCE(*y);
|
||
|
|
WRITE_ONCE(*z, 1);
|
||
|
|
spin_unlock(mylock);
|
||
|
|
}
|
||
|
|
|
||
|
|
P2(int *x, int *z)
|
||
|
|
{
|
||
|
|
int r1;
|
||
|
|
int r2;
|
||
|
|
|
||
|
|
r2 = READ_ONCE(*z);
|
||
|
|
smp_mb();
|
||
|
|
r1 = READ_ONCE(*x);
|
||
|
|
}
|
||
|
|
|
||
|
|
exists (1:r0=1 /\ 2:r2=1 /\ 2:r1=0)
|