#include <db_cxx.h> int DbEnv::mutex_get_increment(u_int32_t *incrementp);
         The DbEnv::mutex_get_increment() method returns the number of
         additional mutexes to allocate.
    
         The DbEnv::mutex_get_increment() method may be called at any time
         during the life of the application.
    
         The DbEnv::mutex_get_increment() 
            
            
                method either returns a non-zero error value or throws an
                exception that encapsulates a non-zero error value on
                failure, and returns 0 on success.