Chapter 6. The DB_LOCK Handle
#include <db.h>
typedef struct __db_lock_u DB_LOCK; The locking interfaces for the Berkeley DB database environment are methods of the DB_ENV handle. The DB_LOCK object is the handle for a single lock, and has no methods of its own.
Locking Subsystem and Related Methods
| Locking Subsystem and Related Methods | Description |
|---|---|
| DB_ENV->lock_detect() | Perform deadlock detection |
| DB_ENV->lock_get() | Acquire a lock |
| DB_ENV->lock_id() | Acquire a locker ID |
| DB_ENV->lock_id_free() | Release a locker ID |
| DB_ENV->lock_put() | Release a lock |
| DB_ENV->lock_stat() | Return lock subsystem statistics |
| DB_ENV->lock_stat_print() | Print lock subsystem statistics |
| DB_ENV->lock_vec() | Acquire/release locks |
| DB_ENV->cdsgroup_begin() | Get a locker ID in Berkeley DB Concurrent Data Store |
| Locking Subsystem Configuration | |
| DB_ENV->set_timeout(), DB_ENV->get_timeout() | Set/get lock and transaction timeout |
| DB_ENV->set_lk_conflicts(), DB_ENV->get_lk_conflicts() | Set/get lock conflicts matrix |
| DB_ENV->set_lk_detect(), DB_ENV->get_lk_detect() | Set/get automatic deadlock detection |
| DB_ENV->set_lk_max_lockers(), DB_ENV->get_lk_max_lockers() | Set/get maximum number of lockers |
| DB_ENV->set_lk_max_locks(), DB_ENV->get_lk_max_locks() | Set/get maximum number of locks |
| DB_ENV->set_lk_max_objects(), DB_ENV->get_lk_max_objects() | Set/get maximum number of lock objects |
| DB_ENV->set_lk_partitions(), DB_ENV->get_lk_partitions() | Set/get number of lock partitions |
| DB_ENV->set_lk_priority(), DB_ENV->get_lk_priority() | Set/get a locker's deadlock priority |
| DB_ENV->set_lk_tablesize(), DB_ENV->get_lk_tablesize() | Set/get size of the lock object hash table |