OSSL-157 — The SSL/TLS session cache cannot be unlocked
Starting a new SSL/TLS session is a relatively costly operation.
Therefore it is possible to share a session for several connections.
Active sessions are stored in session cache shared by all processes of the proxy. Access to the cache is synchronized by a lock. If unlocking the cache fails after an operation with it, the proxy process is terminated. The lock is then ulocked by the OS kernel automatically.