/*
* MemoryContextDelete
* Delete a context and its descendants, and release all space
* allocated therein.
*
* The type-specific delete routine removes all subsidiary storage
* for the context, but we have to delete the context node itself,
* as well as recurse to get the children. We must also delink the
* node from its parent, if it has one.
*/
void
MemoryContextDelete(MemoryContext context)
{
AssertArg(MemoryContextIsValid(context));
/* We had better not be deleting TopMemoryContext ... */
Assert(context != TopMemoryContext);
/* And not CurrentMemoryContext, either */
Assert(context != CurrentMemoryContext);
MemoryContextDeleteChildren(context);
/*
* It's not entirely clear whether 'tis better to do this before or after
* delinking the context; but an error in a callback will likely result in
* leaking the whole context (if it's not a root context) if we do it
* after, so let's do it before.
*/
MemoryContextCallResetCallbacks(context);
/*
* We delink the context from its parent before deleting it, so that if
* there's an error we won't have deleted/busted contexts still attached
* to the context tree. Better a leak than a crash.
*/
MemoryContextSetParent(context, NULL);
(*context->methods->delete_context) (context);
VALGRIND_DESTROY_MEMPOOL(context);
pfree(context);
}
/*
* Transfer ownership of an expanded object to a new___ parent memory context.
* The object must be referenced by a R/W pointer, and what we return is
* always its "standard" R/W pointer, which is certain to have the same
* lifespan as the object itself. (The passed-in pointer might not, and
* in any case wouldn't provide a unique identifier if it's not that one.)
*/
Datum
TransferExpandedObject(Datum d, MemoryContext new_parent)
{
ExpandedObjectHeader *eohptr = DatumGetEOHP(d);
/* Assert caller gave a R/W pointer */
Assert(VARATT_IS_EXTERNAL_EXPANDED_RW(DatumGetPointer(d)));
/* Transfer ownership */
MemoryContextSetParent(eohptr->eoh_context, new_parent);
/* Return the object's standard read-write pointer */
return EOHPGetRWDatum(eohptr);
}
/*
* MemoryContextDelete
* Delete a context and its descendants, and release all space
* allocated therein.
*
* The type-specific delete routine removes all subsidiary storage
* for the context, but we have to delete the context node itself,
* as well as recurse to get the children. We must also delink the
* node from its parent, if it has one.
*/
void
MemoryContextDelete(MemoryContext context)
{
AssertArg(MemoryContextIsValid(context));
/* We had better not be deleting TopMemoryContext ... */
Assert(context != TopMemoryContext);
/* And not CurrentMemoryContext, either */
Assert(context != CurrentMemoryContext);
MemoryContextDeleteChildren(context);
/*
* We delink the context from its parent before deleting it, so that if
* there's an error we won't have deleted/busted contexts still attached
* to the context tree. Better a leak than a crash.
*/
MemoryContextSetParent(context, NULL);
(*context->methods->delete_context) (context);
pfree(context);
}
