[sr-dev] [kamailio] fix race condition in tls module when checking available memory limits (#126)

Under high load, the value returned by `shm_available()` can be total garbage, because it is not multiprocess safe. In the tls module, it makes the tests against the `low_mem_thresholdX` limits randomly return false positives, with errors such as: ``` ERROR: tls [tls_server.c:273]: tls_fix_connection(): tls: ssl bug #1491 workaround: not enough memory for safe operation: 88 ``` although there is plenty of free shm memory. This patch solves the issue by adding a safe version of the function. You can view, comment on, or merge this pull request online at: https://github.com/kamailio/kamailio/pull/126 -- Commit Summary -- * mem: add a multiprocess-safe shm_available() * tls: use multiprocess-safe shm_available() -- File Changes -- M mem/shm_mem.c (8) M mem/shm_mem.h (5) M modules/tls/tls_server.c (4) -- Patch Links -- https://github.com/kamailio/kamailio/pull/126.patch https://github.com/kamailio/kamailio/pull/126.diff --- Reply to this email directly or view it on GitHub: https://github.com/kamailio/kamailio/pull/126