### DbMpoolFile::put |

`

###

    #include <db_cxx.h>

    int
    DbMpoolFile::put(void *pgaddr, u_int32_t flags);

### Description: DbMpoolFile::put

The DbMpoolFile::put method returns a page to the cache.

The DbMpoolFile::put 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.

### Parameters

pgaddr
  The pgaddr parameter is the address of the page to be returned to the cache. The pgaddr parameter must be an address previously returned by DbMpoolFile::get.

flags
  The flags parameter 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.

### Errors

The DbMpoolFile::put method may fail and throw DbException, encapsulating one of the following non-zero errors, or return one of the following non-zero errors:

EACCES
  The DB_MPOOL_DIRTY flag was set and the source file was not opened for writing.

EINVAL
  If the pgaddr parameter does not refer to a page returned by DbMpoolFile::get; more than one of the DB_MPOOL_CLEAN and DB_MPOOL_DIRTY flags was set; or if an invalid flag value or parameter was specified.

### Class

DbEnv, DbMpoolFile

### See Also

Memory Pools and Related Methods`

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