4ae76249ed
Worker threads ports need to receive 'remove pid' message to properly handle application process exit case and finish requests processed by particular application worker. Main process send 'remove pid' notification to service thread port only and this message must be 'proxied' to other running engines. Separate memory pool created for this message. For each engine structure required to post message to engine allocate from the pool using 'retain' allocation method. After successfull post structure will be freed using 'release' method. To completely destroy poll one more 'release' should be called to release initial reference count. I'm afraid this should be simplified using good old malloc() and free() calls.
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