Berkeley DB: DbEnv::lock_detect
Description: Berkeley DB: An embedded database programmatic toolkit.
Keywords: embedded,database,programmatic,toolkit,b+tree,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,java,C,C++

# DbEnv::lock_detect |

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###

    #include <db_cxx.h>

    int
    DbEnv::lock_detect(u_int32_t flags, u_int32_t atype, int *aborted);

# Description

The DbEnv::lock_detect method runs one iteration of the deadlock detector. The deadlock detector traverses the lock table, and for each deadlock it finds, marks one of the participating transactions for abort.

The flags value must be set to 0 or by bitwise inclusively OR'ing together one or more of the following values.

DB_LOCK_CONFLICT
  Only run the deadlock detector if a lock conflict has occurred since the last time that the deadlock detector was run.

The atype parameter specifies which transaction to abort in the case of deadlock. It must be set to one of possible arguments listed for the DbEnv::set_lk_detect interface.

If the aborted parameter is non-NULL, the memory location it references will be set to the number of transactions aborted by the DbEnv::lock_detect method.

The DbEnv::lock_detect 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.

# Errors

The DbEnv::lock_detect method may fail and throw an exception or return a non-zero error for errors specified for other Berkeley DB and C library or system methods. If a catastrophic error has occurred, the DbEnv::lock_detect method may fail and either return DB_RUNRECOVERY or throw an exception encapsulating DB_RUNRECOVERY, in which case all subsequent Berkeley DB calls will fail in the same way.

### Classes

DbEnv, DbLock

# See Also

DbEnv::set_lk_conflicts, DbEnv::set_lk_detect, DbEnv::set_lk_max, DbEnv::lock_detect, DbEnv::lock_get, DbEnv::lock_id, DbLock::put, DbEnv::lock_stat and DbEnv::lock_vec.`

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