#include <db_cxx.h> int DbEnv::get_mp_max_openfd(int *maxopenfdp);
Returns the maximum number of file descriptors the library will open concurrently when flushing dirty pages from the cache. This value is set by the DbEnv::set_mp_max_openfd() method.
         The DbEnv::get_mp_max_openfd() method may be called at any time
         during the life of the application.
    
         The DbEnv::get_mp_max_openfd() 
            
            
                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.