public Task<Token> AcquireAsync()
{
this.comingRequest = new AcquireRequest();
Task<Token> resultTask = this.comingRequest.AcquireTask;
lock (this.acquireRequests)
{
if (this.processingRequest == null)
{
this.processingRequest = this.comingRequest;
this.comingRequest.GrantRequestAndRunContinuation();
}
else
{
this.acquireRequests.Enqueue(this.comingRequest);
}
}
return resultTask;
}
public void Release(Token token)
{
if (this.processingRequest != token)
{
throw new InvalidOperationException("Invalid owner token");
}
lock (this.acquireRequests)
{
// need to clean it before grant the next request!!
this.processingRequest = null;
if (this.acquireRequests.Count > 0)
{
this.processingRequest = this.acquireRequests.Dequeue();
}
}
if (this.processingRequest != null)
{
// to prevent deadlocks, you should generally avoid running arbitrary user code such as event handlers or in this case, continuations, under a lock
this.processingRequest.GrantRequestAndRunContinuation();
}
}