public void BarelyUpgrade()
{
// setup
var rwLock = new ReaderWriterLockSlim();
var rValue = new Read();
var wValue = new Write();
var subject = new ReaderWriterSynchronized <Write, Read>(rwLock, wValue, rValue);
subject.UpgradeableReader.BarelyLock();
// act and assert
var result = subject.BarelyLock();
result.ShouldBe(wValue);
}
public void LockTryUpgrade()
{
// setup
var rwLock = new ReaderWriterLockSlim();
var rValue = new Read();
var wValue = new Write();
var subject = new ReaderWriterSynchronized <Write, Read>(rwLock, wValue, rValue);
// act and assert
using (var rGuard = subject.UpgradeableReader.Lock())
using (var wGuard = subject.TryLock())
{
rwLock.IsWriteLockHeld.ShouldBeTrue();
wGuard.Value.ShouldBe(wValue);
}
rwLock.IsUpgradeableReadLockHeld.ShouldBeFalse();
}
public void WithLockAction_Reentrant()
{
// setup
var rwLock = new ReaderWriterLockSlim(LockRecursionPolicy.SupportsRecursion);
var value = new object();
var subject = new ReaderWriterSynchronized <object, object>(rwLock, value, value);
// act and assert
subject.WithLock((v) =>
{
subject.WithLock((v2) =>
{
rwLock.IsWriteLockHeld.ShouldBeTrue();
v2.ShouldBe(value);
});
});
rwLock.IsWriteLockHeld.ShouldBeFalse();
}
public void WithLockAction_Reentrant()
{
// setup
var rwLock = new ReaderWriterLockSlim(LockRecursionPolicy.SupportsRecursion);
var rValue = new Read();
var wValue = new Write();
var subject = new ReaderWriterSynchronized <Write, Read>(rwLock, wValue, rValue).UpgradeableReader;
// act and assert
subject.WithLock((v) =>
{
subject.WithLock((v2) =>
{
rwLock.IsUpgradeableReadLockHeld.ShouldBeTrue();
v2.ShouldBe(rValue);
});
});
rwLock.IsUpgradeableReadLockHeld.ShouldBeFalse();
}
public void WithLockActionUpgrade()
{
// setup
var rwLock = new ReaderWriterLockSlim();
var rValue = new Read();
var wValue = new Write();
var subject = new ReaderWriterSynchronized <Write, Read>(rwLock, wValue, rValue);
// act and assert
subject.UpgradeableReader.WithLock((r) =>
{
subject.WithLock((w) =>
{
rwLock.IsWriteLockHeld.ShouldBeTrue();
w.ShouldBe(wValue);
});
});
rwLock.IsUpgradeableReadLockHeld.ShouldBeFalse();
}
public void BarelyTryLock_ConcurrentAcquire()
{
// setup
var rwLock = new ReaderWriterLockSlim();
var value = new object();
var subject = new ReaderWriterSynchronized <object, object>(rwLock, value, value).Reader;
var setupEvent = new AutoResetEvent(false);
new Thread(() =>
{
rwLock.EnterReadLock();
setupEvent.Set();
}).Start();
setupEvent.WaitOne();
// act and assert
subject.BarelyTryLock(out var result).ShouldBeTrue();
result.ShouldBe(value);
rwLock.IsReadLockHeld.ShouldBeTrue();
}
