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