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) |