/**
* Test that saveMMAPV1LockerImpl works by examining the output.
*/
TEST(LockerImpl, saveAndRestoreGlobal) {
Locker::LockSnapshot lockInfo;
MMAPV1LockerImpl locker;
// No lock requests made, no locks held.
locker.saveLockStateAndUnlock(&lockInfo);
ASSERT_EQUALS(0U, lockInfo.locks.size());
// Lock the global lock, but just once.
locker.lockGlobal(MODE_IX);
// We've locked the global lock. This should be reflected in the lockInfo.
locker.saveLockStateAndUnlock(&lockInfo);
ASSERT(!locker.isLocked());
ASSERT_EQUALS(MODE_IX, lockInfo.globalMode);
// Restore the lock(s) we had.
locker.restoreLockState(lockInfo);
ASSERT(locker.isLocked());
ASSERT(locker.unlockAll());
}
/**
* Test that we don't unlock when we have the global lock more than once.
*/
TEST(LockerImpl, saveAndRestoreGlobalAcquiredTwice) {
Locker::LockSnapshot lockInfo;
MMAPV1LockerImpl locker;
// No lock requests made, no locks held.
locker.saveLockStateAndUnlock(&lockInfo);
ASSERT_EQUALS(0U, lockInfo.locks.size());
// Lock the global lock.
locker.lockGlobal(MODE_IX);
locker.lockGlobal(MODE_IX);
// This shouldn't actually unlock as we're in a nested scope.
ASSERT(!locker.saveLockStateAndUnlock(&lockInfo));
ASSERT(locker.isLocked());
// We must unlockAll twice.
ASSERT(!locker.unlockAll());
ASSERT(locker.unlockAll());
}
