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38 lines
644 B
38 lines
644 B
C WRC+pooncerelease+fencermbonceonce+Once |
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(* |
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* Result: Never |
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* |
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* This litmus test is an extension of the message-passing pattern, where |
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* the first write is moved to a separate process. Because it features |
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* a release and a read memory barrier, it should be forbidden. More |
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* specifically, this litmus test is forbidden because smp_store_release() |
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* is A-cumulative in LKMM. |
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*) |
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{} |
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P0(int *x) |
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{ |
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WRITE_ONCE(*x, 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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r0 = READ_ONCE(*x); |
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smp_store_release(y, 1); |
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} |
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P2(int *x, int *y) |
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{ |
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int r0; |
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int r1; |
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r0 = READ_ONCE(*y); |
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smp_rmb(); |
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r1 = READ_ONCE(*x); |
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} |
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exists (1:r0=1 /\ 2:r0=1 /\ 2:r1=0)
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