Berkeley DB: txn_commit
Description: Berkeley DB: An embedded database programmatic toolkit.
Keywords: embedded,database,programmatic,toolkit,b+tree,btr ee,hash,hashing,transaction,transactions,locking,logging,access method,access me thods,java,C,C++

# txn_commit

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    #include <db.h>

    int
    txn_commit(DB_TXN *tid);

# Description

The txn_commit function ends the transaction specified by the tid argument.

If DB_TXN_NOSYNC was not specified, a commit log record is written and flushed to disk, as are all previously written log records.

If the transaction is nested, its locks are acquired by the parent transaction, otherwise its locks are released. Note: nested transactions are not yet supported.

Any applications that require strict two-phase locking must not release any locks explicitly, leaving them all to be released by txn_commit.

The txn_commit function returns the value of errno on failure, and 0 on success.

# Errors

If a fatal error occurs in Berkeley DB, the txn_commit function may fail and return DB_RUNRECOVERY, at which point all subsequent database calls will also return DB_RUNRECOVERY.

The txn_commit function may fail and return errno for any of the errors specified for the following Berkeley DB and C library functions: abort(3), fcntl(3), fflush(3), fprintf(3), free(3), getpid(3), lock_vec, log_put, malloc(3), memcpy(3), memset(3), strerror(3), vfprintf(3), and vsnprintf(3).

In addition, the txn_commit function may fail and return errno for the following conditions:

EINVAL
  The transaction was already aborted.

# See Also

txn_abort, txn_begin, txn_checkpoint, txn_close, txn_commit, txn_id, txn_open, txn_prepare, txn_stat and txn_unlink.`