PrepGeomCacheCleaner()

static int PrepGeomCacheCleaner ( GeomCache *  cache )

static

This function is passed into the generic GetGeomCache function in the case of a cache miss, so that it can free the particular indexed structure being managed.

In the case of prepared geometry, we want to leave the actual PrepGeomCache allocated and in place, but ensure that the GEOS Geometry and PreparedGeometry are freed so we don't leak memory as we transition from cache hit to miss to hit, etc.

Definition at line 304 of file lwgeom_geos_prepared.c.

{
        PrepGeomHashEntry* pghe = 0;
        PrepGeomCache* prepcache = (PrepGeomCache*)cache;
 
        if ( ! prepcache )
                return LW_FAILURE;
 
        /*
        * Clear out the references to the soon-to-be-freed GEOS objects
        * from the callback hash entry
        */
        pghe = GetPrepGeomHashEntry(prepcache->context_callback);
        if ( ! pghe )
        {
                lwpgerror("PrepGeomCacheCleaner failed to find hash entry for context %p", prepcache->context_callback);
                return LW_FAILURE;
        }
        pghe->geom = 0;
        pghe->prepared_geom = 0;
 
        /*
        * Free the GEOS objects and free the index tree
        */
        POSTGIS_DEBUGF(3, "PrepGeomCacheFreeer: freeing %p argnum %d", prepcache, prepcache->gcache.argnum);
        GEOSPreparedGeom_destroy( prepcache->prepared_geom );
        GEOSGeom_destroy( (GEOSGeometry *)prepcache->geom );
        prepcache->gcache.argnum = 0;
        prepcache->prepared_geom = 0;
        prepcache->geom = 0;
 
        return LW_SUCCESS;
}

References PrepGeomCache::context_callback, PrepGeomCache::gcache, PrepGeomHashEntry::geom, PrepGeomCache::geom, GetPrepGeomHashEntry(), LW_FAILURE, LW_SUCCESS, PrepGeomHashEntry::prepared_geom, and PrepGeomCache::prepared_geom.

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