Berkeley DB

lock_get

						#include <db.h>
						int
						lock_get(DB_ENV *env, u_int32_t locker,
						u_int32_t flags, const DBT *obj,
						const db_lockmode_t lock_mode, DB_LOCK *lock);
					

Description

The lock_get function acquires a lock from the lock table, returning information about it in the lock argument.

The locker argument specified to lock_get 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 granted because the requested lock conflicts with an existing lock, return immediately instead of waiting for the lock to become available.

The obj argument is an untyped byte string that specifies the object to be locked or released.Applications ...