PostGIS  2.3.7dev-r@@SVN_REVISION@@
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 387 of file lwgeom_geos_prepared.c.

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

388 {
389  PrepGeomHashEntry* pghe = 0;
390  PrepGeomCache* prepcache = (PrepGeomCache*)cache;
391 
392  if ( ! prepcache )
393  return LW_FAILURE;
394 
395  /*
396  * Clear out the references to the soon-to-be-freed GEOS objects
397  * from the callback hash entry
398  */
399  pghe = GetPrepGeomHashEntry(prepcache->context_callback);
400  if ( ! pghe )
401  {
402  lwpgerror("PrepGeomCacheCleaner failed to find hash entry for context %p", prepcache->context_callback);
403  return LW_FAILURE;
404  }
405  pghe->geom = 0;
406  pghe->prepared_geom = 0;
407 
408  /*
409  * Free the GEOS objects and free the index tree
410  */
411  POSTGIS_DEBUGF(3, "PrepGeomCacheFreeer: freeing %p argnum %d", prepcache, prepcache->argnum);
412  GEOSPreparedGeom_destroy( prepcache->prepared_geom );
413  GEOSGeom_destroy( (GEOSGeometry *)prepcache->geom );
414  prepcache->argnum = 0;
415  prepcache->prepared_geom = 0;
416  prepcache->geom = 0;
417 
418  return LW_SUCCESS;
419 }
const GEOSPreparedGeometry * prepared_geom
#define LW_SUCCESS
Definition: liblwgeom.h:79
#define LW_FAILURE
Definition: liblwgeom.h:78
const GEOSPreparedGeometry * prepared_geom
const GEOSGeometry * geom
const GEOSGeometry * geom
static PrepGeomHashEntry * GetPrepGeomHashEntry(MemoryContext mcxt)
MemoryContext context_callback

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