#include <db_cxx.h>
 
int
DbEnv::lock_id(u_int32_t *idp);

The DbEnv::lock_id() method copies a locker ID, which is guaranteed to be unique in the environment's lock table, into the memory location to which idp refers.

Note that lockers are not free-threaded; lockers can not be used by more than one thread at the same time.

The DbEnv::lock_id_free() method should be called to return the locker ID to the Berkeley DB library when it is no longer needed.

The DbEnv::lock_id() 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.