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Terminating process with pending callbacks

Posted: 12/29/2009 19:54:32
by Weihan Wang (Standard support level)
Joined: 12/13/2009
Posts: 4

What would happen if the process terminates (e.g. due to crashes) with ongoing callback operations? Does CBFS return immediately to the caller with an error code?

Posted: 12/30/2009 01:55:23
by Volodymyr Zinin (Team)

If it terminates a process which contains the CallbackFS callbacks then nothing will be called already (the process is just terminated and all resources allocated for it are cleaned).

If another process accessed a CallbackFS virtual disk but before its terminating has not closed any file handles on it then Windows itself closes them and the OnClose callback will be called. If there are pending callback operations at this time then CallbackFS will wait for them and process in the same way as the "standard" file system (FATFS, NTFS) do.
Posted: 01/10/2010 09:02:03
by Weihan Wang (Standard support level)
Joined: 12/13/2009
Posts: 4

My last post was confusing. What I meant is the following scenario:

Process A contains CallbackFS callbacks. Process B is now accessing the CallbackFS virtual disk which causes an ongoing callback operation within process A. Now, before this operation returns, A crashes. My questions is, in this case, will the system call that blocks B returns immediately with an error code, or will the system call block until timeout (specified by A via CallbackFileSystem.ResetTimeout), or ...?
Posted: 01/10/2010 09:22:45
by Eugene Mayevski (Team)

The driver will wait until timeout elapses and then return control to the OS with the error.

Sincerely yours
Eugene Mayevski
Posted: 01/11/2010 01:18:05
by Eugene Mayevski (Team)

Correction: if the driver can detect process A shutdown (i.e. when the process A is terminated, and not suspended to capture debug information or blocked), execution will be returned immediately.

Sincerely yours
Eugene Mayevski



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