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For accurate app descriptor release, it is required to count the number of use counts. Use count increased when: - app linked to configuration app queue; - socket conf stores pointer to app; - request for start app process posted to router service thread; Application port has pointer to app, but it does not increase use count to avoid use count loop. Timer needs a pointer to nxt_timer_t which is stored in engine timers tree. nxt_timer_t now resides in nxt_app_joint_t and does not lock the application. Start process port RPC handlers is also linked to nxt_app_joint_t. App joint (nxt_app_joint_t) is a 'weak pointer': - single threaded; - use countable; - store pointer to nxt_app_t (which can be NULL); nxt_app_t has pointer to nxt_app_joint_t and update its pointer to app.
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