TEST(LockManagerTest, TxError) {
LockManager lm;
LockManager::LockStatus status;
Transaction tx(1);
// release a lock on a resource we haven't locked
lm.acquire(&tx, kShared, 2);
status = lm.release(&tx, kShared, 1); // this is in error
ASSERT(LockManager::kLockResourceNotFound == status);
status = lm.release(&tx, kShared, 2);
ASSERT(LockManager::kLockReleased == status);
// release a record we've locked in a different mode
lm.acquire(&tx, kShared, 1);
status = lm.release(&tx, kExclusive, 1); // this is in error
ASSERT(LockManager::kLockModeNotFound == status);
status = lm.release(&tx, kShared, 1);
ASSERT(LockManager::kLockReleased == status);
lm.acquire(&tx, kExclusive, 1);
status = lm.release(&tx, kShared, 1); // this is in error
ASSERT(LockManager::kLockModeNotFound == status);
status = lm.release(&tx, kExclusive, 1);
ASSERT(LockManager::kLockReleased == status);
// attempt to acquire on a transaction that aborted
try {
lm.abort(&tx);
} catch (const LockManager::AbortException& err) { }
try {
lm.acquire(&tx, kShared, 1); // error
ASSERT(false);
} catch (const LockManager::AbortException& error) {
}
}
TEST(LockManagerTest, SingleTx) {
LockManager lm;
Transaction t1(1);
ResourceId r1 = 1;
LockManager::LockStatus status;
// acquire a shared record lock
ASSERT(! lm.isLocked(&t1, kShared, r1));
lm.acquire(&t1, kShared, r1);
ASSERT(lm.isLocked(&t1, kShared, r1));
// release a shared record lock
lm.release(&t1, kShared, r1);
ASSERT(! lm.isLocked(&t1, kShared, r1));
// acquire a shared record lock twice, on same ResourceId
lm.acquire(&t1, kShared, r1);
lm.acquire(&t1, kShared, r1);
ASSERT(lm.isLocked(&t1, kShared, r1));
// release the twice-acquired lock, once. Still locked
status = lm.release(&t1, kShared, r1);
ASSERT(LockManager::kLockCountDecremented == status);
ASSERT(lm.isLocked(&t1, kShared, r1));
// after 2nd release, it's not locked
status = lm.release(&t1, kShared, r1);
ASSERT(LockManager::kLockReleased == status);
ASSERT(!lm.isLocked(&t1, kShared, r1));
// --- test downgrade and release ---
// acquire an exclusive then a shared lock, on the same ResourceId
lm.acquire(&t1, kExclusive, r1);
ASSERT(lm.isLocked(&t1, kExclusive, r1));
lm.acquire(&t1, kShared, r1);
ASSERT(lm.isLocked(&t1, kExclusive, r1));
ASSERT(lm.isLocked(&t1, kShared, r1));
// release shared first, then exclusive
lm.release(&t1, kShared, r1);
ASSERT(! lm.isLocked(&t1, kShared, r1));
ASSERT(lm.isLocked(&t1, kExclusive, r1));
lm.release(&t1, kExclusive, r1);
ASSERT(! lm.isLocked(&t1, kExclusive, r1));
// release exclusive first, then shared
lm.acquire(&t1, kExclusive, r1);
lm.acquire(&t1, kShared, r1);
lm.release(&t1, kExclusive, r1);
ASSERT(! lm.isLocked(&t1, kExclusive, r1));
ASSERT(lm.isLocked(&t1, kShared, r1));
lm.release(&t1, kShared, r1);
ASSERT(! lm.isLocked(&t1, kShared, r1));
// --- test upgrade and release ---
// acquire a shared, then an exclusive lock on the same ResourceId
lm.acquire(&t1, kShared, r1);
ASSERT(lm.isLocked(&t1, kShared, r1));
lm.acquire(&t1, kExclusive, r1);
ASSERT(lm.isLocked(&t1, kShared, r1));
ASSERT(lm.isLocked(&t1, kExclusive, r1));
// release exclusive first, then shared
lm.release(&t1, kExclusive, r1);
ASSERT(! lm.isLocked(&t1, kExclusive, r1));
ASSERT(lm.isLocked(&t1, kShared, r1));
lm.release(&t1, kShared, r1);
ASSERT(! lm.isLocked(&t1, kShared, r1));
// release shared first, then exclusive
lm.acquire(&t1, kShared, r1);
lm.acquire(&t1, kExclusive, r1);
lm.release(&t1, kShared, r1);
ASSERT(! lm.isLocked(&t1, kShared, r1));
ASSERT(lm.isLocked(&t1, kExclusive, r1));
lm.release(&t1, kExclusive, r1);
ASSERT(! lm.isLocked(&t1, kExclusive, r1));
}
