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Berkeley DB: DbEnv::lock_get
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DbEnv::lock_get
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#include <db_cxx.h>
int
DbEnv::lock_get(u_int32_t locker, u_int32_t flags,
const Dbt *object, const db_lockmode_t lock_mode, DbLock *lock);
Description: DbEnv::lock_get
The DbEnv::lock_get method acquires a lock from the lock table, returning
information about it in the lock parameter.
The DbEnv::lock_get 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.
Parameters
flags- The flags parameter 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 DB_LOCK_NOTGRANTED or throw a
DbLockNotGrantedException immediately instead of waiting for
the lock to become available.
lock_mode
locker- The locker parameter is an unsigned 32-bit integer quantity. It
represents the entity requesting the lock.
object- The object parameter is an untyped byte string that specifies the
object to be locked. Applications using the locking subsystem directly
while also doing locking via the Berkeley DB access methods must take care not
to inadvertently lock objects that happen to be equal to the unique file
IDs used to lock files. See
Access method locking conventions
for more information.
Errors
The DbEnv::lock_get method
may fail and throw
DbException,
encapsulating one of the following non-zero errors, or return one of
the following non-zero errors:
EINVAL- An
invalid flag value or parameter was specified.
If a transactional database environment operation was selected to
resolve a deadlock, the DbEnv::lock_get method will fail and
either return DB_LOCK_DEADLOCK or
throw a DbDeadlockException exception.
If a Berkeley DB Concurrent Data Store database environment configured for lock timeouts was unable
to grant a lock in the allowed time, the DbEnv::lock_get method will fail and
either return DB_LOCK_NOTGRANTED or
throw a DbLockNotGrantedException exception.
If the DB_LOCK_NOWAIT flag or lock timers were configured and the lock could not be granted before the wait-time expired,
the DbEnv::lock_get method will fail and
either return DB_LOCK_NOTGRANTED or
throw a DbLockNotGrantedException exception.
If the maximum number of locks has been reached, the DbEnv::lock_get method will fail and
either return ENOMEM or
throw a DbMemoryException.
Class
DbEnv, DbLock
See Also
Locking Subsystem and Related Methods
Copyright (c) 1996,2008 Oracle. All rights reserved.