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Berkeley DB: memp_fput
memp_fput
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#include <db.h>
int
memp_fput(DB_MPOOLFILE *mpf, void *pgaddr, u_int32_t flags);
Description
The memp_fput function indicates that the page to which pgaddr
refers can be evicted from the pool. The pgaddr argument must
be an address previously returned by memp_fget.
The flags value must be set to 0 or by bitwise inclusively OR'ing together one or
more of the following values:
- DB_MPOOL_CLEAN
- Clear any previously set modification information (that is, don't bother
writing the page back to the source file).
- DB_MPOOL_DIRTY
- The page has been modified and must be written to the source file before
being evicted from the pool.
- DB_MPOOL_DISCARD
- The page is unlikely to be useful in the near future, and should be
discarded before other pages in the pool.
The DB_MPOOL_CLEAN and DB_MPOOL_DIRTY flags are
mutually exclusive.
The memp_fput function returns a non-zero error value on failure and 0 on success.
Errors
The memp_fput function may fail and return a non-zero error for the following conditions:
- EACCES
- The DB_MPOOL_DIRTY flag was set and the source file was not
opened for writing.
- EINVAL
- An invalid flag value or parameter was specified.
The pgaddr argument does not refer to a page returned by
memp_fget.
More than one of the DB_MPOOL_CLEAN and DB_MPOOL_DIRTY
flags was set.
The memp_fput 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 memp_fput 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,
memp_fclose,
memp_fget,
memp_fopen,
memp_fput,
memp_fset,
memp_fsync,
memp_register,
memp_stat,
memp_sync,
and
memp_trickle.
Copyright Sleepycat Software
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