# Multithreaded Filtering

To make sure that multithreaded filter processes are thread-safe, you must create a unique context pointer for every thread by calling fpInit() or fpInitWithLicenseData(). In addition, threads must not share context pointers, and the same context pointer must be used for all API calls in the same thread. This applies to in-process and out-of-process API calls. Creating a context pointer for every thread does not affect performance because the context pointer uses minimal resources.

For example, C code for file filtering must have the following logic in a thread:

    fpInit()
       KVGetExtractInterface()
       fpOpenFile()
       fpGetMainFileInfo()            /* container file */
       fpGetSubFileInfo()
       fpExtractSubFile
       fpGetSubFileMetadata()
       fpFilterFile()
       fpCloseFile()

       fpOpenFile()
       fpGetMainFileInfo()            /* not a container file */
       fpGetDocInfoFile()
       fpGetOLESummaryInfoFile()
       fpFilterFile()
       fpCloseFile()
       ...
    fpShutdown()

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