public void SupportsRecursion__WriteLockIsHeld__AnotherLockCanBeAcquired()
{
var l = new ReaderWriterLockSlimEx(LockRecursionPolicy.SupportsRecursion);
IReadLockAcquisition r;
IUpgradeableReadLockAcquisition ur;
IWriteLockAcquisition w;
var a1 = l.AcquireReadLock();
var a2 = l.TryAcquireReadLock(TEST_DefaultTimeout, out r);
var a3 = l.TryAcquireUpgradeableReadLock(TEST_DefaultTimeout, out ur);
var a4 = l.TryAcquireWriteLock(TEST_DefaultTimeout, out w);
Assert.IsTrue(a2);
Assert.IsFalse(a3);
Assert.IsFalse(a4);
}
public void ReadLockIsHeld__AnotherThreadDoesNotBlockOnUpgradeableReadLockAcquisition()
{
var l = new ReaderWriterLockSlimEx();
using (l.AcquireReadLock())
{
Task.Factory.StartNew(() =>
{
var acquisition = (IUpgradeableReadLockAcquisition)null;
if (!l.TryAcquireUpgradeableReadLock(TEST_DefaultTimeout, out acquisition))
{
// should be able to acquire
Assert.Fail();
}
}).Wait();
}
}
public void UpgradeableReadLockIsHeld__AnotherThreadDoesNotBlockOnUpgradeableReadLockAcquisition()
{
// NOTE: this is how Reader Writer Lock Slim works
// only one thread can own Upgradeable Read Lock at the time
var l = new ReaderWriterLockSlimEx();
using (l.AcquireUpgradeableReadLock())
{
Task.Factory.StartNew(() =>
{
var acquisition = (IUpgradeableReadLockAcquisition)null;
if (l.TryAcquireUpgradeableReadLock(TEST_DefaultTimeout, out acquisition))
{
Assert.Fail();
}
}).Wait();
}
}
public void ReadLockIsHeld__CannotAcquireUpgradeableReadLock()
{
var l = new ReaderWriterLockSlimEx();
using (var rl = l.AcquireReadLock())
{
var acquisition = (IUpgradeableReadLockAcquisition)null;
if (l.TryAcquireUpgradeableReadLock(TEST_DefaultTimeout, out acquisition))
{
// should not get here
Assert.Fail();
}
}
}