public void TestSynchronizedBlockWithInvalidUsage()
{
this.TestWithError(async() =>
{
try
{
var monitor = SynchronizedBlock.Lock(new object());
// We yield to make sure the execution is asynchronous.
await Task.Yield();
monitor.Pulse();
// We do not dispose inside a using statement, because the `SynchronizationLockException`
// will trigger the disposal, which will fail because an await statement is not allowed
// inside a synchronized block. The C# compiler normally prevents it when using the lock
// statement, but we cannot prevent it when directly using the mock.
monitor.Dispose();
}
catch (SynchronizationLockException)
{
Specification.Assert(false, "Expected exception thrown.");
}
},
expectedError: "Expected exception thrown.",
replay: true);
}
internal void DoLock()
{
using (var monitor = SynchronizedBlock.Lock(this.SyncObject))
{
Debug.WriteLine("Re-entered lock from the same task {0}.", GetCurrentTaskId());
}
}
internal void Signal()
{
using (var monitor = SynchronizedBlock.Lock(this.SyncObject))
{
this.Signalled = true;
monitor.Pulse();
}
}
internal void ReentrantWait()
{
Debug.WriteLine("Entering lock on task {0}.", GetCurrentTaskId());
using (var monitor = SynchronizedBlock.Lock(this.SyncObject))
{
Debug.WriteLine("Entered lock on task {0}.", GetCurrentTaskId());
this.DoWait();
}
}
public void TestSynchronizedBlockWithInvalidSyncObject()
{
this.TestWithException <ArgumentNullException>(() =>
{
using (var monitor = SynchronizedBlock.Lock(null))
{
}
},
replay: true);
}
internal void DoWait()
{
using (var monitor = SynchronizedBlock.Lock(this.SyncObject))
{
Debug.WriteLine("Re-entered lock from the same task {0}.", GetCurrentTaskId());
Debug.WriteLine("Task {0} is now waiting...", GetCurrentTaskId());
this.Wait();
Debug.WriteLine("Task {0} received the signal.", GetCurrentTaskId());
}
}
internal void Wait()
{
using (var monitor = SynchronizedBlock.Lock(this.SyncObject))
{
while (!this.Signalled)
{
bool result = monitor.Wait();
Assert.True(result, "Wait returned false.");
}
}
}
public void TestSynchronizedBlockWithInvalidPulseAllState()
{
this.TestWithException <SynchronizationLockException>(() =>
{
SynchronizedBlock monitor;
using (monitor = SynchronizedBlock.Lock(new object()))
{
}
monitor.PulseAll();
},
replay: true);
}
public void TestSynchronizedBlockWithAsyncExecution()
{
if (!this.IsSystematicTest)
{
return;
}
// We only test this without rewriting. With rewriting, we don't need to use synchronized block
// and the compiler will make sure that an await cannot exist inside a lock block.
this.TestWithError(async() =>
{
using (var monitor = SynchronizedBlock.Lock(new object()))
{
// Normally, an await statement is not allowed inside a synchronized block.
// The C# compiler normally prevents it when using the lock statement, but
// we cannot prevent it when directly using the mock. Using it here fails
// because `Dispose` is invoked from an asynchronized continuation.
await Task.Yield();
}
},
expectedError: "Cannot invoke Dispose without acquiring the lock.",
replay: true);
}