#include <db.h>
int
DB_MPOOLFILE->put(DB_MPOOLFILE *mpf,
    void *pgaddr, DB_CACHE_PRIORITY priority, u_int32_t flags);  
      
         The DB_MPOOLFILE->put() method returns a reference to a page in the
         cache, setting the priority of the page as specified by the priority parameter.
    
         The DB_MPOOLFILE->put() 
            
                  method returns a non-zero error value on failure and 0 on success.
            
            
        
    
The pgaddr parameter is the address of the page to be returned to the cache. The pgaddr parameter must be a value previously returned by the DB_MPOOLFILE->get() method.
Set the page's priority as follows:
The priority is unchanged.
                  DB_PRIORITY_VERY_LOW
            
The lowest priority: pages are the most likely to be discarded.
                  DB_PRIORITY_LOW
            
The next lowest priority.
                  DB_PRIORITY_DEFAULT
            
The default priority.
                  DB_PRIORITY_HIGH
            
The next highest priority.
                  DB_PRIORITY_VERY_HIGH
            
The highest priority: pages are the least likely to be discarded.
                         The DB_MPOOLFILE->put() 
            
                 method may fail and return one of the following non-zero errors: