)I,Berkeley DB: DbMpoolFile::put[P

DbMpoolFile::put





#include <db_cxx.h>

int0DbMpoolFile::put(void *pgaddr, u_int32_t flags);





Description



AThe DbMpoolFile::put method indicates that the page referenced by>pgaddr can be evicted from the pool. The pgaddruargument must be an address previously returned by DbMpoolFile::get.

VThe flags argument is specified by logically OR'ing together one or moreof the following values:

^

DB_MPOOL_CLEAN
Clear any previously set modification information (i.e., don't bother*writing the page back to the source file).Z

DB_MPOOL_DIRTY
The page has been modified and must be written to the source file#before being evicted from the pool.P

DB_MPOOL_DISCARD
The page is unlikely to be useful in the near future,7and should be discarded before other pages in the pool.


/The DB_MPOOL_CLEAN and DB_MPOOL_DIRTY flags aremutually exclusive.

The DbMpoolFile::put>method either returns errno or throws an exception that:encapsulates an errno on failure, and 0 on success.



Errors

WIf a fatal error occurs in Berkeley DB, the DbMpoolFile::put method may fail and eitherIreturn DB_RUNRECOVERY or throw an exception encapsulating DB_RUNRECOVERY,Gat which point all subsequent database calls will also fail in the sameFway. Methods marked as returning errno will, by default, throwHan exception that encapsulates the error information. The default error\behavior can be changed, see
DbException.

The DbMpoolFile::put&method may fail and throw an exceptionKfor any of the errors specified for the following Berkeley DB and C library functions:DBmemp->pgin(3),DBmemp->pgout(3), abort(3), close(3),dbenv->db_paniccall(3), fcntl(3), fflush(3), fprintf(3),free(3), fstat(3), fsync(3), getenv(3), getpid(3), getuid(3), isdigit(3),>DbLog::compare,:DbLog::flush, lseek(3), malloc(3), memcmp(3), memcpy(3), memset(3),mmap(3),open(3), pread(3),pstat_getdynamic(3), pwrite(3),read(3),sigfillset(3),sigprocmask(3),stat(3), strerror(3), strlen(3), sysconf(3),time(3), unlink(3), vfprintf(3), vsnprintf(3),and write(3).

!In addition, the DbMpoolFile::put&method may fail and throw an exceptionor return errnofor the following conditions:

W

EACCES
The DB_MPOOL_DIRTY flag was set and the source file was not opened forwriting.
B

EINVAL
An invalid flag value or parameter was specified.

AThe pgaddr parameter does not reference a page returned byBDbMpoolFile::get.

AMore than one of DB_MPOOL_CLEAN and DB_MPOOL_DIRTY flags was set.





Class

>DbMpoolFile



See Also

FDbMpoolFile::close,BDbMpoolFile::get,DDbMpoolFile::open,DbMpoolFile::put,ADbMpoolFile::setandDDbMpoolFile::sync.
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