public void CanAcquireAndReleaseWriteLock()
{
var l = new ReaderWriterLockSlimEx();
using (l.AcquireWriteLock())
{
// access lock here so it's not optimized-away after release build
Assert.IsNotNull(l);
}
}
public void CanUpgradeUpgradeableReadLock()
{
var l = new ReaderWriterLockSlimEx();
using (var rl = l.AcquireUpgradeableReadLock())
{
// access lock here so it's not optimized-away after release build
Assert.IsNotNull(l);
using(rl.UpgradeToWriteLock())
{
// access lock here so it's not optimized-away after release build
Assert.IsNotNull(l);
}
}
}
public void using_child_locks__avoids_deadlock_situations()
{
// Lock_1 (more coarse than Lock_2)
// Lock_2 (child of Lock_1, more granual)
// Thread_1 accesses Lock_1 then Lock_2
// Thread_2 accesses Lock_2 only
var l1 = new ReaderWriterLockSlimEx(LockRecursionPolicy.NoRecursion);
var l2 = new ReaderWriterLockSlimEx(LockRecursionPolicy.NoRecursion);
l1.AddChild(l2);
bool oh_no = false;
var t1 = Task.Run(() =>
{
using (l1.AcquireWriteLockIfNotHeld())
{
Trace.WriteLine("t1 acquired l1");
Thread.Sleep(1000);
using (l2.AcquireReadLockIfNotHeld())
{
if (oh_no)
Assert.Fail(":(");
}
}
});
var t2 = Task.Run(() =>
{
Thread.Sleep(100);
using (l2.AcquireWriteLock())
{
oh_no = true;
Trace.WriteLine("t2 acquired l2");
}
});
Task.WaitAll(new[] { t1, t2 });
}
public void WriteLockIsHeld__AnotherThreadBlocksOnReadLockAcquisition()
{
var l = new ReaderWriterLockSlimEx();
using (l.AcquireWriteLock())
{
Task.Factory.StartNew(() =>
{
var acquisition = (IReadLockAcquisition)null;
if(l.TryAcquireReadLock(TEST_DefaultTimeout, out acquisition))
{
// should not get here
Assert.Fail();
}
}).Wait();
}
}
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 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__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 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();
}
}
}
public ReadLockAcquisition(ReaderWriterLockSlimEx owner, IDisposable disposeWhenDone)
{
this.Owner = owner;
this.Disposable = disposeWhenDone;
}
public UpgradeableReadLockAcquisition(ReaderWriterLockSlimEx owner)
{
this.Owner = owner;
}
public WriteLockAcquisition(ReaderWriterLockSlimEx owner)
{
this.Owner = owner;
}