Change in libosmocore[master]: add osmo_use_count API

Neels Hofmeyr gerrit-no-reply at
Sun Mar 24 17:29:44 UTC 2019

Hello Vadim Yanitskiy, Pau Espin Pedrol, Harald Welte, Jenkins Builder, 

I'd like you to reexamine a change. Please visit

to look at the new patch set (#7).

Change subject: add osmo_use_count API

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

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
M include/
A include/osmocom/core/use_count.h
M src/
A src/use_count.c
M tests/
M tests/
A tests/use_count/use_count_test.c
A tests/use_count/use_count_test.err
A tests/use_count/use_count_test.ok
9 files changed, 1,031 insertions(+), 0 deletions(-)

  git pull ssh:// refs/changes/21/13121/7
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Gerrit-Project: libosmocore
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: Ife31e6798b4e728a23913179e346552a7dd338c0
Gerrit-Change-Number: 13121
Gerrit-PatchSet: 7
Gerrit-Owner: Neels Hofmeyr <nhofmeyr at>
Gerrit-Reviewer: Harald Welte <laforge at>
Gerrit-Reviewer: Jenkins Builder (1000002)
Gerrit-Reviewer: Neels Hofmeyr <nhofmeyr at>
Gerrit-Reviewer: Pau Espin Pedrol <pespin at>
Gerrit-Reviewer: Vadim Yanitskiy <axilirator at>
Gerrit-CC: Max <msuraev at>
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