#include <db.h> int DB_ENV->mutex_get_increment(DB_ENV *dbenv, u_int32_t *incrementp);
         The DB_ENV->mutex_get_increment() method returns the number of
         additional mutexes to allocate.
    
         The DB_ENV->mutex_get_increment() method may be called at any time
         during the life of the application.
    
         The DB_ENV->mutex_get_increment() 
            
                  method returns a non-zero error value on failure and 0 on success.