COM Server hang- detection and resolution

I have an application that sends requests to an out of proc COM server whom handles the requests and sends them back to the requesting application.

The cli开发者_如何学Pythonent application is really in control of the start-stop of this Out-of-Proc COM server and determines its lifetime so to say.

Because this application has many hundreds of requests at any given time, it mostly has at least 4 of the same COM servers to handle these requests.

The problem is that sometimes this COM servers gets hung up handling a request, which is caught by the requesting application, whom kills the out of proc COM server. This however does not always happen.

What sometimes happens is that the client application requests a COM server kill, which results in the client releasing all references to the COM Server, but the COM server ends up just using 25% of the CPU and just never dies. It seems it just hangs and uses CPU constantly.

The client has mechanism to attempt to kill the COM Server process forcibly if it fails to die, however even that does not seem to work in the cases where the COM server gets into the CPU usage and just hangs.

Has anybody experienced something similar or has some advice on how one could resolve a situation like this?

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You need to design all calls in the COM server in such way that they all end in some reasonably short time. Once a new call arrives from the client COM spawns a separate thread and dispatches a call onto that thread. There's no reliable way to interrupt the call - the call needs to end on itself (just return). You achieve this by designing your algorithm appropriately.