コード例 #1
0
ファイル: resowner.c プロジェクト: lhcezar/postgres
static void
ResourceOwnerReleaseInternal(ResourceOwner owner,
							 ResourceReleasePhase phase,
							 bool isCommit,
							 bool isTopLevel)
{
	ResourceOwner child;
	ResourceOwner save;
	ResourceReleaseCallbackItem *item;

	/* Recurse to handle descendants */
	for (child = owner->firstchild; child != NULL; child = child->nextchild)
		ResourceOwnerReleaseInternal(child, phase, isCommit, isTopLevel);

	/*
	 * Make CurrentResourceOwner point to me, so that ReleaseBuffer etc don't
	 * get confused.  We needn't PG_TRY here because the outermost level will
	 * fix it on error abort.
	 */
	save = CurrentResourceOwner;
	CurrentResourceOwner = owner;

	if (phase == RESOURCE_RELEASE_BEFORE_LOCKS)
	{
		/*
		 * Release buffer pins.  Note that ReleaseBuffer will remove the
		 * buffer entry from my list, so I just have to iterate till there are
		 * none.
		 *
		 * During a commit, there shouldn't be any remaining pins --- that
		 * would indicate failure to clean up the executor correctly --- so
		 * issue warnings.	In the abort case, just clean up quietly.
		 *
		 * We are careful to do the releasing back-to-front, so as to avoid
		 * O(N^2) behavior in ResourceOwnerForgetBuffer().
		 */
		while (owner->nbuffers > 0)
		{
			if (isCommit)
				PrintBufferLeakWarning(owner->buffers[owner->nbuffers - 1]);
			ReleaseBuffer(owner->buffers[owner->nbuffers - 1]);
		}

		/*
		 * Release relcache references.  Note that RelationClose will remove
		 * the relref entry from my list, so I just have to iterate till there
		 * are none.
		 *
		 * As with buffer pins, warn if any are left at commit time, and
		 * release back-to-front for speed.
		 */
		while (owner->nrelrefs > 0)
		{
			if (isCommit)
				PrintRelCacheLeakWarning(owner->relrefs[owner->nrelrefs - 1]);
			RelationClose(owner->relrefs[owner->nrelrefs - 1]);
		}
	}
	else if (phase == RESOURCE_RELEASE_LOCKS)
	{
		if (isTopLevel)
		{
			/*
			 * For a top-level xact we are going to release all locks (or at
			 * least all non-session locks), so just do a single lmgr call at
			 * the top of the recursion.
			 */
			if (owner == TopTransactionResourceOwner)
			{
				ProcReleaseLocks(isCommit);
				ReleasePredicateLocks(isCommit);
			}
		}
		else
		{
			/*
			 * Release locks retail.  Note that if we are committing a
			 * subtransaction, we do NOT release its locks yet, but transfer
			 * them to the parent.
			 */
			LOCALLOCK **locks;
			int			nlocks;

			Assert(owner->parent != NULL);

			/*
			 * Pass the list of locks owned by this resource owner to the lock
			 * manager, unless it has overflowed.
			 */
			if (owner->nlocks > MAX_RESOWNER_LOCKS)
			{
				locks = NULL;
				nlocks = 0;
			}
			else
			{
				locks = owner->locks;
				nlocks = owner->nlocks;
			}

			if (isCommit)
				LockReassignCurrentOwner(locks, nlocks);
			else
				LockReleaseCurrentOwner(locks, nlocks);
		}
	}
	else if (phase == RESOURCE_RELEASE_AFTER_LOCKS)
	{
		/*
		 * Release catcache references.  Note that ReleaseCatCache will remove
		 * the catref entry from my list, so I just have to iterate till there
		 * are none.
		 *
		 * As with buffer pins, warn if any are left at commit time, and
		 * release back-to-front for speed.
		 */
		while (owner->ncatrefs > 0)
		{
			if (isCommit)
				PrintCatCacheLeakWarning(owner->catrefs[owner->ncatrefs - 1]);
			ReleaseCatCache(owner->catrefs[owner->ncatrefs - 1]);
		}
		/* Ditto for catcache lists */
		while (owner->ncatlistrefs > 0)
		{
			if (isCommit)
				PrintCatCacheListLeakWarning(owner->catlistrefs[owner->ncatlistrefs - 1]);
			ReleaseCatCacheList(owner->catlistrefs[owner->ncatlistrefs - 1]);
		}
		/* Ditto for plancache references */
		while (owner->nplanrefs > 0)
		{
			if (isCommit)
				PrintPlanCacheLeakWarning(owner->planrefs[owner->nplanrefs - 1]);
			ReleaseCachedPlan(owner->planrefs[owner->nplanrefs - 1], true);
		}
		/* Ditto for tupdesc references */
		while (owner->ntupdescs > 0)
		{
			if (isCommit)
				PrintTupleDescLeakWarning(owner->tupdescs[owner->ntupdescs - 1]);
			DecrTupleDescRefCount(owner->tupdescs[owner->ntupdescs - 1]);
		}
		/* Ditto for snapshot references */
		while (owner->nsnapshots > 0)
		{
			if (isCommit)
				PrintSnapshotLeakWarning(owner->snapshots[owner->nsnapshots - 1]);
			UnregisterSnapshot(owner->snapshots[owner->nsnapshots - 1]);
		}

		/* Ditto for temporary files */
		while (owner->nfiles > 0)
		{
			if (isCommit)
				PrintFileLeakWarning(owner->files[owner->nfiles - 1]);
			FileClose(owner->files[owner->nfiles - 1]);
		}

		/* Clean up index scans too */
		ReleaseResources_hash();
	}

	/* Let add-on modules get a chance too */
	for (item = ResourceRelease_callbacks; item; item = item->next)
		(*item->callback) (phase, isCommit, isTopLevel, item->arg);

	CurrentResourceOwner = save;
}
コード例 #2
0
ファイル: resowner.c プロジェクト: adityavs/postgres
static void
ResourceOwnerReleaseInternal(ResourceOwner owner,
							 ResourceReleasePhase phase,
							 bool isCommit,
							 bool isTopLevel)
{
	ResourceOwner child;
	ResourceOwner save;
	ResourceReleaseCallbackItem *item;
	Datum		foundres;

	/* Recurse to handle descendants */
	for (child = owner->firstchild; child != NULL; child = child->nextchild)
		ResourceOwnerReleaseInternal(child, phase, isCommit, isTopLevel);

	/*
	 * Make CurrentResourceOwner point to me, so that ReleaseBuffer etc don't
	 * get confused.
	 */
	save = CurrentResourceOwner;
	CurrentResourceOwner = owner;

	if (phase == RESOURCE_RELEASE_BEFORE_LOCKS)
	{
		/*
		 * Release buffer pins.  Note that ReleaseBuffer will remove the
		 * buffer entry from our array, so we just have to iterate till there
		 * are none.
		 *
		 * During a commit, there shouldn't be any remaining pins --- that
		 * would indicate failure to clean up the executor correctly --- so
		 * issue warnings.  In the abort case, just clean up quietly.
		 */
		while (ResourceArrayGetAny(&(owner->bufferarr), &foundres))
		{
			Buffer		res = DatumGetBuffer(foundres);

			if (isCommit)
				PrintBufferLeakWarning(res);
			ReleaseBuffer(res);
		}

		/* Ditto for relcache references */
		while (ResourceArrayGetAny(&(owner->relrefarr), &foundres))
		{
			Relation	res = (Relation) DatumGetPointer(foundres);

			if (isCommit)
				PrintRelCacheLeakWarning(res);
			RelationClose(res);
		}

		/* Ditto for dynamic shared memory segments */
		while (ResourceArrayGetAny(&(owner->dsmarr), &foundres))
		{
			dsm_segment *res = (dsm_segment *) DatumGetPointer(foundres);

			if (isCommit)
				PrintDSMLeakWarning(res);
			dsm_detach(res);
		}

		/* Ditto for JIT contexts */
		while (ResourceArrayGetAny(&(owner->jitarr), &foundres))
		{
			JitContext *context = (JitContext *) PointerGetDatum(foundres);

			jit_release_context(context);
		}
	}
	else if (phase == RESOURCE_RELEASE_LOCKS)
	{
		if (isTopLevel)
		{
			/*
			 * For a top-level xact we are going to release all locks (or at
			 * least all non-session locks), so just do a single lmgr call at
			 * the top of the recursion.
			 */
			if (owner == TopTransactionResourceOwner)
			{
				ProcReleaseLocks(isCommit);
				ReleasePredicateLocks(isCommit);
			}
		}
		else
		{
			/*
			 * Release locks retail.  Note that if we are committing a
			 * subtransaction, we do NOT release its locks yet, but transfer
			 * them to the parent.
			 */
			LOCALLOCK **locks;
			int			nlocks;

			Assert(owner->parent != NULL);

			/*
			 * Pass the list of locks owned by this resource owner to the lock
			 * manager, unless it has overflowed.
			 */
			if (owner->nlocks > MAX_RESOWNER_LOCKS)
			{
				locks = NULL;
				nlocks = 0;
			}
			else
			{
				locks = owner->locks;
				nlocks = owner->nlocks;
			}

			if (isCommit)
				LockReassignCurrentOwner(locks, nlocks);
			else
				LockReleaseCurrentOwner(locks, nlocks);
		}
	}
	else if (phase == RESOURCE_RELEASE_AFTER_LOCKS)
	{
		/*
		 * Release catcache references.  Note that ReleaseCatCache will remove
		 * the catref entry from our array, so we just have to iterate till
		 * there are none.
		 *
		 * As with buffer pins, warn if any are left at commit time.
		 */
		while (ResourceArrayGetAny(&(owner->catrefarr), &foundres))
		{
			HeapTuple	res = (HeapTuple) DatumGetPointer(foundres);

			if (isCommit)
				PrintCatCacheLeakWarning(res);
			ReleaseCatCache(res);
		}

		/* Ditto for catcache lists */
		while (ResourceArrayGetAny(&(owner->catlistrefarr), &foundres))
		{
			CatCList   *res = (CatCList *) DatumGetPointer(foundres);

			if (isCommit)
				PrintCatCacheListLeakWarning(res);
			ReleaseCatCacheList(res);
		}

		/* Ditto for plancache references */
		while (ResourceArrayGetAny(&(owner->planrefarr), &foundres))
		{
			CachedPlan *res = (CachedPlan *) DatumGetPointer(foundres);

			if (isCommit)
				PrintPlanCacheLeakWarning(res);
			ReleaseCachedPlan(res, true);
		}

		/* Ditto for tupdesc references */
		while (ResourceArrayGetAny(&(owner->tupdescarr), &foundres))
		{
			TupleDesc	res = (TupleDesc) DatumGetPointer(foundres);

			if (isCommit)
				PrintTupleDescLeakWarning(res);
			DecrTupleDescRefCount(res);
		}

		/* Ditto for snapshot references */
		while (ResourceArrayGetAny(&(owner->snapshotarr), &foundres))
		{
			Snapshot	res = (Snapshot) DatumGetPointer(foundres);

			if (isCommit)
				PrintSnapshotLeakWarning(res);
			UnregisterSnapshot(res);
		}

		/* Ditto for temporary files */
		while (ResourceArrayGetAny(&(owner->filearr), &foundres))
		{
			File		res = DatumGetFile(foundres);

			if (isCommit)
				PrintFileLeakWarning(res);
			FileClose(res);
		}
	}

	/* Let add-on modules get a chance too */
	for (item = ResourceRelease_callbacks; item; item = item->next)
		item->callback(phase, isCommit, isTopLevel, item->arg);

	CurrentResourceOwner = save;
}