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Berkeley DB: memp_trickle
memp_trickle
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#include <db.h>
int
memp_trickle(DB_ENV *env, int pct, int *nwrotep);
Description
The memp_trickle function ensures that at least pct percent of
the pages in the shared memory pool are clean by writing dirty pages to
their backing files.
If the nwrotep argument is non-NULL, the number of pages that
were written to reach the correct percentage is returned in the memory
location to which it refers.
The purpose of the memp_trickle function is to enable a memory
pool manager to ensure that a page is always available for reading in new
information without having to wait for a write.
The memp_trickle function returns a non-zero error value on failure and 0 on success.
Errors
The memp_trickle function may fail and return a non-zero error for the following conditions:
- EINVAL
- An invalid flag value or parameter was specified.
The memp_trickle 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_trickle 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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