# DB_MPOOLFILE->sync

`

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    #include <db.h>

    int
    DB_MPOOLFILE->sync(DB_MPOOLFILE *mpf);

# Description

The DB_MPOOLFILE->sync function writes all pages associated with the DB_MPOOLFILE, which were marked as modified using DB_MPOOLFILE->put or DB_MPOOLFILE->set, back to the source file. If any of the modified pages are also pinned (that is, this or another process currently refers to them), DB_MPOOLFILE->sync will ignore them.

The DB_MPOOLFILE->sync function returns a non-zero error value on failure, 0 on success, and returns DB_INCOMPLETE if there were pages that were modified but that DB_MPOOLFILE->sync was unable to write immediately.

# Errors

The DB_MPOOLFILE->sync function may fail and return a non-zero error for errors specified for other Berkeley DB and C library or system functions. If a catastrophic error has occurred, the DB_MPOOLFILE->sync function may fail and return DB_RUNRECOVERY, in which case all subsequent Berkeley DB calls will fail in the same way.

# See Also

DB_ENV->set_cachesize, DB_ENV->set_mp_mmapsize, DB_ENV->memp_fcreate, DB_MPOOLFILE->close, DB_MPOOLFILE->get, DB_MPOOLFILE->open, DB_MPOOLFILE->put, DB_MPOOLFILE->set, DB_MPOOLFILE->sync, DB_ENV->memp_register, DB_MPOOLFILE->set_clear_len, DB_MPOOLFILE->set_fileid, DB_MPOOLFILE->set_ftype, DB_MPOOLFILE->set_lsn_offset, DB_MPOOLFILE->set_pgcookie, DB_ENV->memp_stat, DB_ENV->memp_sync, and DB_ENV->memp_trickle.`

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