#include <db.h>

int
DB_ENV->mutex_get_max(DB_ENV *dbenv, u_int32_t *maxp);  

The DB_ENV->mutex_get_max() method returns the total number of mutexes allocated.

The DB_ENV->mutex_get_max() method may be called at any time during the life of the application.

The DB_ENV->mutex_get_max() method returns a non-zero error value on failure and 0 on success.