void mongoc_cleanup (void);
Initialize the MongoDB C Driver by calling mongoc_init() exactly once at the beginning of your program. It is responsible for initializing global state such as process counters, SSL, and threading primitives.
Call mongoc_cleanup() exactly once at the end of your program to release all memory and other resources allocated by the driver. You must not call any other MongoDB C Driver functions after mongoc_cleanup(). Note that mongoc_init() does not reinitialize the driver after mongoc_cleanup().