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27 lines
386 B
27 lines
386 B
C MP+poonceonces |
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(* |
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* Result: Sometimes |
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* |
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* Can the counter-intuitive message-passing outcome be prevented with |
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* no ordering at all? |
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*) |
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{} |
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P0(int *buf, int *flag) // Producer |
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{ |
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WRITE_ONCE(*buf, 1); |
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WRITE_ONCE(*flag, 1); |
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} |
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P1(int *buf, int *flag) // Consumer |
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{ |
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int r0; |
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int r1; |
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r0 = READ_ONCE(*flag); |
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r1 = READ_ONCE(*buf); |
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} |
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exists (1:r0=1 /\ 1:r1=0) (* Bad outcome. *)
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