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30 lines
499 B
30 lines
499 B
C R+fencembonceonces |
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(* |
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* Result: Never |
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* |
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* This is the fully ordered (via smp_mb()) version of one of the classic |
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* counterintuitive litmus tests that illustrates the effects of store |
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* propagation delays. Note that weakening either of the barriers would |
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* cause the resulting test to be allowed. |
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*) |
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{} |
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P0(int *x, int *y) |
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{ |
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WRITE_ONCE(*x, 1); |
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smp_mb(); |
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WRITE_ONCE(*y, 1); |
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} |
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P1(int *x, int *y) |
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{ |
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int r0; |
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WRITE_ONCE(*y, 2); |
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smp_mb(); |
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r0 = READ_ONCE(*x); |
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} |
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exists (y=2 /\ 1:r0=0)
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