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Fix bug as we can't fail spuriously here.

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Patrick Pelissier committed 2018-02-17 19:28:09 +01:00
1 parent cba37abfae
commit e274a49ffd
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m-snapshot.h
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@@ -374,7 +374,7 @@ static inline unsigned int snapshot_mrsw_int_read_start(snapshot_mrsw_int_t s)
unsigned int c = atomic_fetch_add(&s->cptTab[idx], 1); unsigned int c = atomic_fetch_add(&s->cptTab[idx], 1);
assert (c <= s->n + 1); assert (c <= s->n + 1);
// Try to ack it // Try to ack it
if (atomic_compare_exchange_weak(&s->lastNext, &previous, newNext)) if (atomic_compare_exchange_strong(&s->lastNext, &previous, newNext))
break; break;
// If we have been preempted by another read thread // If we have been preempted by another read thread
if (idx == SNAPSHOTI_MRSW_INT_FLAG_W(previous)) { if (idx == SNAPSHOTI_MRSW_INT_FLAG_W(previous)) {