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authorNeels Hofmeyr <neels@hofmeyr.de>2019-02-11 20:32:25 +0100
committerNeels Hofmeyr <nhofmeyr@sysmocom.de>2019-04-08 13:47:17 +0000
commit0e8df1c7e48bcae2285c7c138bd50f932049bd24 (patch)
treeebc61be55958db4925f412bfb55906cf100d94eb /include/osmocom/gsm
parent0c7826e9bd8026b239d320dba49416fd603f17fd (diff)
add osmo_use_count API
Provide a common implementation of use counting that supports naming each user as well as counting more than just one use per user, depending on the rules the caller implies. In osmo-msc, we were originally using a simple int counter to see whether a connection is still in use or should be discarded. For clarity, we later added names to each user in the form of a bitmask of flags, to figure out exactly which users are still active: for logging and to debug double get / double put bugs. This however is still not adequate, since there may be more than one CM Service Request pending. Also, it is a specialized implementation that is not re-usable. With this generalized implementation, we can: - fix the problem of inadequate counting of multiple concurrent CM Service Requests (more than one use count per user category), - directly use arbitrary names for uses like __func__ or "foo" (no need to define enums and value_string[]s), - re-use the same code for e.g. vlr_subscr and get fairly detailed VLR susbscriber usage logging for free. Change-Id: Ife31e6798b4e728a23913179e346552a7dd338c0
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