Library Version 18.1.40

DB_ENV->lock_id()
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## DB_ENV->lock_id()

    #include <db.h>

    int
    DB_ENV->lock_id(DB_ENV *env, u_int32_t *idp);

The `DB_ENV->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 DB_ENV->lock_id_free() method should be called to return the locker ID to the Berkeley DB library when it is no longer needed.

The `DB_ENV->lock_id()` method returns a non-zero error value on failure and 0 on success.

### Parameters

#### idp

The idp parameter references memory into which the allocated locker ID is copied.

### Class

DB_ENV, DB_LOCK

### See Also

Locking Subsystem and Related Methods

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