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- C MP+polockonce+poacquiresilsil
- (*
- * Result: Sometimes
- *
- * Do spinlocks provide order to outside observers using spin_is_locked()
- * to sense the lock-held state, ordered by acquire? Note that when the
- * first spin_is_locked() returns false and the second true, we know that
- * the smp_load_acquire() executed before the lock was acquired (loosely
- * speaking).
- *)
- {
- }
- P0(spinlock_t *lo, int *x)
- {
- spin_lock(lo);
- WRITE_ONCE(*x, 1);
- spin_unlock(lo);
- }
- P1(spinlock_t *lo, int *x)
- {
- int r1;
- int r2;
- int r3;
- r1 = smp_load_acquire(x);
- r2 = spin_is_locked(lo);
- r3 = spin_is_locked(lo);
- }
- exists (1:r1=1 /\ 1:r2=0 /\ 1:r3=1)
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