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35 lines
719 B
35 lines
719 B
C LB+unlocklockonceonce+poacquireonce |
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(* |
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* Result: Never |
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* |
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* If two locked critical sections execute on the same CPU, all accesses |
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* in the first must execute before any accesses in the second, even if the |
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* critical sections are protected by different locks. Note: Even when a |
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* write executes before a read, their memory effects can be reordered from |
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* the viewpoint of another CPU (the kind of reordering allowed by TSO). |
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*) |
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{} |
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P0(spinlock_t *s, spinlock_t *t, int *x, int *y) |
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{ |
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int r1; |
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spin_lock(s); |
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r1 = READ_ONCE(*x); |
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spin_unlock(s); |
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spin_lock(t); |
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WRITE_ONCE(*y, 1); |
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spin_unlock(t); |
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} |
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P1(int *x, int *y) |
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{ |
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int r2; |
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r2 = smp_load_acquire(y); |
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WRITE_ONCE(*x, 1); |
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} |
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exists (0:r1=1 /\ 1:r2=1)
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