/// <summary>
/// Acquires a resource according to the specified resource request, either blocking until successful, or
/// returning <null> if the resource is not immediately available.
/// </summary>
/// <param name="resourceRequest">The IResourceRequest that specifies the criteria by which to select the resource.</param>
/// <param name="blockAwaitingAcquisition">If true, request will suspend until granted. If false, will return false if unable to fulfill.</param>
/// <returns>True if granted, false if not granted.</returns>
public bool Acquire(IResourceRequest resourceRequest, bool blockAwaitingAcquisition)
{
if (blockAwaitingAcquisition)
{
IDetachableEventController dec = Model.Executive.CurrentEventController;
if (dec == null)
{
throw new ApplicationException("Someone tried to call Acquire(..., true) while not in a detachable event. This is not allowed.");
}
dec.SetAbortHandler(resourceRequest.AbortHandler);
resourceRequest.ResourceRequestAborting += m_onResourceRequestAborting;
while (true)
{
if (Acquire(resourceRequest))
{
break;
}
m_waiters.Add(dec);
dec.Suspend();
dec.ClearAbortHandler();
}
return(true);
}
else
{
return(Acquire(resourceRequest));
}
}
/// <summary>
/// Acquires the resource and quantity specifed by the resource request, blocking
/// until it can return successfully.
/// </summary>
/// <param name="request">The resource request that describes the desired resource and quantity.</param>
/// <returns>Always true.</returns>
protected bool AcquireWithWait(IResourceRequest request)
{
IDetachableEventController dec = Model.Executive.CurrentEventController;
if (dec == null)
{
throw new ApplicationException("Someone tried to call AcquireWithWait() while not in a detachable event. This is not allowed.");
}
dec.SetAbortHandler(request.AbortHandler);
request.ResourceRequestAborting += m_onResourceRequestAborting;
while (!Acquire(request, false))
{
m_waiters.Add(request, dec);
dec.Suspend();
dec.ClearAbortHandler();
}
if (request.ResourceObtained != null)
{
ResourceAcquired?.Invoke(request, request.ResourceObtained);
return(true);
}
else
{
return(false);
}
}
private void LogSynchronization(object sortKey, IDetachableEventController idec, SynchChannel sc)
{
if (m_waiters.ContainsValue(idec))
{
throw new ApplicationException("Synchronize(...) called on a SynchChannel that is already waiting.");
}
if (!m_synchChannels.Contains(sc))
{
throw new ApplicationException("SynchChannel applied to a synchronizer that did not own it - serious error.");
}
if ((m_waiters.Count + 1) == m_synchChannels.Count)
{
m_exec.RequestEvent(new ExecEventReceiver(LaunchAll), m_exec.Now, m_exec.CurrentPriorityLevel, null);
}
m_waiters.Add(sortKey, idec);
idec.SetAbortHandler(new DetachableEventAbortHandler(idec_AbortionEvent));
idec.Suspend();
idec.ClearAbortHandler();
}
