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1C ISA2+pooncelock+pooncelock+pombonce2 3(*4 * Result: Never5 *6 * This test shows that write-write ordering provided by locks7 * (in P0() and P1()) is visible to external process P2().8 *)9 10{}11 12P0(int *x, int *y, spinlock_t *mylock)13{14 spin_lock(mylock);15 WRITE_ONCE(*x, 1);16 WRITE_ONCE(*y, 1);17 spin_unlock(mylock);18}19 20P1(int *y, int *z, spinlock_t *mylock)21{22 int r0;23 24 spin_lock(mylock);25 r0 = READ_ONCE(*y);26 WRITE_ONCE(*z, 1);27 spin_unlock(mylock);28}29 30P2(int *x, int *z)31{32 int r1;33 int r2;34 35 r2 = READ_ONCE(*z);36 smp_mb();37 r1 = READ_ONCE(*x);38}39 40exists (1:r0=1 /\ 2:r2=1 /\ 2:r1=0)41