Berkeley DB

DbEnv::lock_vec

						#include <db_cxx.h>
						int
						DbEnv::lock_vec(u_int32_t locker, u_int32_t flags,
						DB_LOCKREQ list[], int nlist, DB_LOCKREQ **elistp);
					

Description

The DbEnv::lock_vec method atomically obtains and releases one or more locks from the lock table. The DbEnv::lock_vec method is intended to support acquisition or trading of multiple locks under one lock table semaphore, as is needed for lock coupling or in multigranularity locking for lock escalation.

The locker argument specified to DbEnv::lock_vec is an unsigned 32-bit integer quantity. It represents the entity requesting or releasing the lock.

The flags value must be set to 0 or the following value:

• DB_LOCK_NOWAIT If a lock cannot be immediately granted because the requested lock conflicts ...