PDMAsyncCompletionFileInternal.h@ 22544

Last change on this file since 22544 was 22309, checked in by vboxsync, 15 years ago
PDMAsyncCompletion: Add first part of the cache for file I/O
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1	/* $Id: PDMAsyncCompletionFileInternal.h 22309 2009-08-17 20:59:28Z vboxsync $ */
2	/** @file
3	* PDM Async I/O - Transport data asynchronous in R3 using EMT.
4	*/
5
6	/*
7	* Copyright (C) 2006-2008 Sun Microsystems, Inc.
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*
17	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
18	* Clara, CA 95054 USA or visit http://www.sun.com if you need
19	* additional information or have any questions.
20	*/
21
22	#ifndef ___PDMAsyncCompletionFileInternal_h
23	#define ___PDMAsyncCompletionFileInternal_h
24
25	#include <VBox/cfgm.h>
26	#include <VBox/stam.h>
27	#include <iprt/types.h>
28	#include <iprt/file.h>
29	#include <iprt/thread.h>
30	#include <iprt/semaphore.h>
31	#include <iprt/critsect.h>
32	#include <iprt/avl.h>
33
34	#include "PDMAsyncCompletionInternal.h"
35
36	/** @todo: Revise the caching of tasks. We have currently four caches:
37	* Per endpoint task cache
38	* Per class cache
39	* Per endpoint task segment cache
40	* Per class task segment cache
41	*
42	* We could use the RT heap for this probably or extend MMR3Heap (uses RTMemAlloc
43	* instead of managing larger blocks) to have this global for the whole VM.
44	*/
45
46	RT_C_DECLS_BEGIN
47
48	/**
49	* A few forward declerations.
50	*/
51	typedef struct PDMASYNCCOMPLETIONENDPOINTFILE *PPDMASYNCCOMPLETIONENDPOINTFILE;
52	/** Pointer to a request segment. */
53	typedef struct PDMACTASKFILE *PPDMACTASKFILE;
54	/** Pointer to the endpoint class data. */
55	typedef struct PDMASYNCCOMPLETIONTASKFILE *PPDMASYNCCOMPLETIONTASKFILE;
56	/** Pointer to a cache LRU list. */
57	typedef struct PDMACFILELRULIST *PPDMACFILELRULIST;
58	/** Pointer to the global cache structure. */
59	typedef struct PDMACFILECACHEGLOBAL *PPDMACFILECACHEGLOBAL;
60
61	/**
62	* Blocking event types.
63	*/
64	typedef enum PDMACEPFILEAIOMGRBLOCKINGEVENT
65	{
66	/** Invalid tye */
67	PDMACEPFILEAIOMGRBLOCKINGEVENT_INVALID = 0,
68	/** An endpoint is added to the manager. */
69	PDMACEPFILEAIOMGRBLOCKINGEVENT_ADD_ENDPOINT,
70	/** An endpoint is removed from the manager. */
71	PDMACEPFILEAIOMGRBLOCKINGEVENT_REMOVE_ENDPOINT,
72	/** An endpoint is about to be closed. */
73	PDMACEPFILEAIOMGRBLOCKINGEVENT_CLOSE_ENDPOINT,
74	/** The manager is requested to terminate */
75	PDMACEPFILEAIOMGRBLOCKINGEVENT_SHUTDOWN,
76	/** The manager is requested to suspend */
77	PDMACEPFILEAIOMGRBLOCKINGEVENT_SUSPEND,
78	/** The manager is requested to resume */
79	PDMACEPFILEAIOMGRBLOCKINGEVENT_RESUME,
80	/** 32bit hack */
81	PDMACEPFILEAIOMGRBLOCKINGEVENT_32BIT_HACK = 0x7fffffff
82	} PDMACEPFILEAIOMGRBLOCKINGEVENT;
83
84	/**
85	* States of the I/O manager.
86	*/
87	typedef enum PDMACEPFILEMGRSTATE
88	{
89	/** Invalid state. */
90	PDMACEPFILEMGRSTATE_INVALID = 0,
91	/** Normal running state accepting new requests
92	* and processing them.
93	*/
94	PDMACEPFILEMGRSTATE_RUNNING,
95	/** Fault state - not accepting new tasks for endpoints but waiting for
96	* remaining ones to finish.
97	*/
98	PDMACEPFILEMGRSTATE_FAULT,
99	/** Suspending state - not accepting new tasks for endpoints but waiting
100	* for remaining ones to finish.
101	*/
102	PDMACEPFILEMGRSTATE_SUSPENDING,
103	/** Shutdown state - not accepting new tasks for endpoints but waiting
104	* for remaining ones to finish.
105	*/
106	PDMACEPFILEMGRSTATE_SHUTDOWN,
107	/** 32bit hack */
108	PDMACEPFILEMGRSTATE_32BIT_HACK = 0x7fffffff
109	} PDMACEPFILEMGRSTATE;
110
111	/**
112	* State of a async I/O manager.
113	*/
114	typedef struct PDMACEPFILEMGR
115	{
116	/** Next Aio manager in the list. */
117	R3PTRTYPE(struct PDMACEPFILEMGR *) pNext;
118	/** Previous Aio manager in the list. */
119	R3PTRTYPE(struct PDMACEPFILEMGR *) pPrev;
120	/** Current state of the manager. */
121	PDMACEPFILEMGRSTATE enmState;
122	/** Event semaphore the manager sleeps on when waiting for new requests. */
123	RTSEMEVENT EventSem;
124	/** Flag whether the thread waits in the event semaphore. */
125	volatile bool fWaitingEventSem;
126	/** Flag whether this manager uses the failsafe method. */
127	bool fFailsafe;
128	/** Thread data */
129	RTTHREAD Thread;
130	/** The async I/O context for this manager. */
131	RTFILEAIOCTX hAioCtx;
132	/** Flag whether the I/O manager was woken up. */
133	volatile bool fWokenUp;
134	/** List of endpoints assigned to this manager. */
135	R3PTRTYPE(PPDMASYNCCOMPLETIONENDPOINTFILE) pEndpointsHead;
136	/** Number of requests active currently. */
137	unsigned cRequestsActive;
138	/** Pointer to an array of free async I/O request handles. */
139	RTFILEAIOREQ *pahReqsFree;
140	/** Next free position for a free request handle. */
141	unsigned iFreeEntryNext;
142	/** Position of the next free task handle */
143	unsigned iFreeReqNext;
144	/** Size of the array. */
145	unsigned cReqEntries;
146	/** Critical section protecting the blocking event handling. */
147	RTCRITSECT CritSectBlockingEvent;
148	/** Event sempahore for blocking external events.
149	* The caller waits on it until the async I/O manager
150	* finished processing the event. */
151	RTSEMEVENT EventSemBlock;
152	/** Flag whether a blocking event is pending and needs
153	* processing by the I/O manager. */
154	volatile bool fBlockingEventPending;
155	/** Blocking event type */
156	volatile PDMACEPFILEAIOMGRBLOCKINGEVENT enmBlockingEvent;
157	/** Event type data */
158	union
159	{
160	/** Add endpoint event. */
161	struct
162	{
163	/** The endpoint to be added */
164	volatile PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint;
165	} AddEndpoint;
166	/** Remove endpoint event. */
167	struct
168	{
169	/** The endpoint to be removed */
170	volatile PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint;
171	} RemoveEndpoint;
172	/** Close endpoint event. */
173	struct
174	{
175	/** The endpoint to be closed */
176	volatile PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint;
177	} CloseEndpoint;
178	} BlockingEventData;
179	} PDMACEPFILEMGR;
180	/** Pointer to a async I/O manager state. */
181	typedef PDMACEPFILEMGR *PPDMACEPFILEMGR;
182	/** Pointer to a async I/O manager state pointer. */
183	typedef PPDMACEPFILEMGR *PPPDMACEPFILEMGR;
184
185	/**
186	* Data for one request segment waiting for cache entry.
187	*/
188	typedef struct PDMACFILETASKSEG
189	{
190	/** Next task segment in the list. */
191	struct PDMACFILETASKSEG *pNext;
192	/** Task this segment is for. */
193	PPDMASYNCCOMPLETIONTASKFILE pTask;
194	/** Offset into the cache entry buffer to start reading from. */
195	uint32_t uBufOffset;
196	/** Number of bytes to transfer. */
197	size_t cbTransfer;
198	/** Pointer to the buffer. */
199	void *pvBuf;
200	/** Flag whether this entry writes data to the cache. */
201	bool fWrite;
202	} PDMACFILETASKSEG, *PPDMACFILETASKSEG;
203
204	/**
205	* A cache entry
206	*/
207	typedef struct PDMACFILECACHEENTRY
208	{
209	/** The AVL entry data. */
210	AVLRFOFFNODECORE Core;
211	/** Pointer to the previous element. Used in one of the LRU lists.*/
212	struct PDMACFILECACHEENTRY *pPrev;
213	/** Pointer to the next element. Used in one of the LRU lists.*/
214	struct PDMACFILECACHEENTRY *pNext;
215	/** Pointer to the list the entry is in. */
216	PPDMACFILELRULIST pList;
217	/** Pointer to the global cache structure. */
218	PPDMACFILECACHEGLOBAL pCache;
219	/** Endpoint the entry belongs to. */
220	PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint;
221	/** Flags for this entry. Combinations of PDMACFILECACHE_* #defines */
222	uint32_t fFlags;
223	/** Size of the entry. */
224	size_t cbData;
225	/** Pointer to the memory containing the data. */
226	uint8_t *pbData;
227	/** List of tasks waiting for this one to finish. */
228	PPDMACFILETASKSEG pHead;
229	} PDMACFILECACHEENTRY, *PPDMACFILECACHEENTRY;
230	/** I/O is still in progress for this entry. This entry is not evictable. */
231	#define PDMACFILECACHE_ENTRY_IO_IN_PROGRESS RT_BIT(0)
232	/** Entry is locked and thus not evictable. */
233	#define PDMACFILECACHE_ENTRY_LOCKED RT_BIT(1)
234	/** Entry is dirty */
235	#define PDMACFILECACHE_ENTRY_IS_DIRTY RT_BIT(2)
236	/** Entry is not evictable. */
237	#define PDMACFILECACHE_NOT_EVICTABLE (PDMACFILECACHE_ENTRY_LOCKED \| PDMACFILECACHE_IO_IN_PROGRESS)
238
239	/**
240	* LRU list data
241	*/
242	typedef struct PDMACFILELRULIST
243	{
244	/** Head of the list. */
245	PPDMACFILECACHEENTRY pHead;
246	/** Tail of the list. */
247	PPDMACFILECACHEENTRY pTail;
248	/** Number of bytes cached in the list. */
249	uint32_t cbCached;
250	} PDMACFILELRULIST;
251
252	/**
253	* Global cache data.
254	*/
255	typedef struct PDMACFILECACHEGLOBAL
256	{
257	/** Maximum size of the cache in bytes. */
258	uint32_t cbMax;
259	/** Current size of the cache in bytes. */
260	uint32_t cbCached;
261	/** Critical section protecting the cache. */
262	RTCRITSECT CritSect;
263	/** Adaption parameter (p) */
264	uint32_t uAdaptVal;
265	/** LRU list for recently used entries (T1) */
266	PDMACFILELRULIST LruRecentlyUsed;
267	/** LRU list for frequently used entries (T2) */
268	PDMACFILELRULIST LruFrequentlyUsed;
269	/** LRU list for recently evicted entries (B1) */
270	PDMACFILELRULIST LruRecentlyGhost;
271	/** LRU list for evicted entries from T2 (B2) */
272	PDMACFILELRULIST LruFrequentlyGhost;
273	#ifdef VBOX_WITH_STATISTICS
274	/** Hit counter. */
275	STAMCOUNTER cHits;
276	/** Partial hit counter. */
277	STAMCOUNTER cPartialHits;
278	/** Miss counter. */
279	STAMCOUNTER cMisses;
280	/** Bytes read from cache. */
281	STAMCOUNTER StatRead;
282	/** Bytes written to the cache. */
283	STAMCOUNTER StatWritten;
284	/** Time spend to get an entry in the AVL tree. */
285	STAMPROFILEADV StatTreeGet;
286	/** Time spend to insert an entry in the AVL tree. */
287	STAMPROFILEADV StatTreeInsert;
288	/** Time spend to remove an entry in the AVL tree. */
289	STAMPROFILEADV StatTreeRemove;
290	#endif
291	} PDMACFILECACHEGLOBAL;
292
293	/**
294	* Per endpoint cache data.
295	*/
296	typedef struct PDMACFILEENDPOINTCACHE
297	{
298	/** AVL tree managing cache entries. */
299	PAVLRFOFFTREE pTree;
300	/** Critical section protecting the tree. */
301	RTCRITSECT CritSect;
302	/** Pointer to the gobal cache data */
303	PPDMACFILECACHEGLOBAL pCache;
304	} PDMACFILEENDPOINTCACHE, *PPDMACFILEENDPOINTCACHE;
305
306	/**
307	* Global data for the file endpoint class.
308	*/
309	typedef struct PDMASYNCCOMPLETIONEPCLASSFILE
310	{
311	/** Common data. */
312	PDMASYNCCOMPLETIONEPCLASS Core;
313	/** Flag whether we use the failsafe method. */
314	bool fFailsafe;
315	/** Critical section protecting the list of async I/O managers. */
316	RTCRITSECT CritSect;
317	/** Pointer to the head of the async I/O managers. */
318	R3PTRTYPE(PPDMACEPFILEMGR) pAioMgrHead;
319	/** Number of async I/O managers currently running. */
320	unsigned cAioMgrs;
321	/** Maximum number of segments to cache per endpoint */
322	unsigned cTasksCacheMax;
323	/** Maximum number of simultaneous outstandingrequests. */
324	uint32_t cReqsOutstandingMax;
325	/** Bitmask for checking the alignment of a buffer. */
326	RTR3UINTPTR uBitmaskAlignment;
327	/** Global cache data. */
328	PDMACFILECACHEGLOBAL Cache;
329	} PDMASYNCCOMPLETIONEPCLASSFILE;
330	/** Pointer to the endpoint class data. */
331	typedef PDMASYNCCOMPLETIONEPCLASSFILE *PPDMASYNCCOMPLETIONEPCLASSFILE;
332
333	typedef enum PDMACEPFILEBLOCKINGEVENT
334	{
335	/** The invalid event type */
336	PDMACEPFILEBLOCKINGEVENT_INVALID = 0,
337	/** A task is about to be canceled */
338	PDMACEPFILEBLOCKINGEVENT_CANCEL,
339	/** Usual 32bit hack */
340	PDMACEPFILEBLOCKINGEVENT_32BIT_HACK = 0x7fffffff
341	} PDMACEPFILEBLOCKINGEVENT;
342
343	/**
344	* States of the endpoint.
345	*/
346	typedef enum PDMASYNCCOMPLETIONENDPOINTFILESTATE
347	{
348	/** Invalid state. */
349	PDMASYNCCOMPLETIONENDPOINTFILESTATE_INVALID = 0,
350	/** Normal running state accepting new requests
351	* and processing them.
352	*/
353	PDMASYNCCOMPLETIONENDPOINTFILESTATE_ACTIVE,
354	/** The endpoint is about to be closed - not accepting new tasks for endpoints but waiting for
355	* remaining ones to finish.
356	*/
357	PDMASYNCCOMPLETIONENDPOINTFILESTATE_CLOSING,
358	/** Removing from current I/O manager state - not processing new tasks for endpoints but waiting
359	* for remaining ones to finish.
360	*/
361	PDMASYNCCOMPLETIONENDPOINTFILESTATE_REMOVING,
362	/** The current endpoint will be migrated to another I/O manager. */
363	PDMASYNCCOMPLETIONENDPOINTFILESTATE_MIGRATING,
364	/** 32bit hack */
365	PDMASYNCCOMPLETIONENDPOINTFILESTATE_32BIT_HACK = 0x7fffffff
366	} PDMASYNCCOMPLETIONENDPOINTFILESTATE;
367
368	/**
369	* Data for the file endpoint.
370	*/
371	typedef struct PDMASYNCCOMPLETIONENDPOINTFILE
372	{
373	/** Common data. */
374	PDMASYNCCOMPLETIONENDPOINT Core;
375	/** Current state of the endpoint. */
376	PDMASYNCCOMPLETIONENDPOINTFILESTATE enmState;
377	/** async I/O manager this endpoint is assigned to. */
378	R3PTRTYPE(volatile PPDMACEPFILEMGR) pAioMgr;
379	/** Flags for opening the file. */
380	unsigned fFlags;
381	/** File handle. */
382	RTFILE File;
383	/** Size of the underlying file.
384	* Updated while data is appended. */
385	uint64_t cbFile;
386	/** Flag whether caching is enabled for this file. */
387	bool fCaching;
388	/** Flag whether the file was opened readonly. */
389	bool fReadonly;
390	/** List of new tasks. */
391	R3PTRTYPE(volatile PPDMACTASKFILE) pTasksNewHead;
392
393	/** Head of the small cache for allocated task segments for exclusive
394	* use by this endpoint. */
395	R3PTRTYPE(volatile PPDMACTASKFILE) pTasksFreeHead;
396	/** Tail of the small cache for allocated task segments for exclusive
397	* use by this endpoint. */
398	R3PTRTYPE(volatile PPDMACTASKFILE) pTasksFreeTail;
399	/** Number of elements in the cache. */
400	volatile uint32_t cTasksCached;
401
402	/** Cache of endpoint data. */
403	PDMACFILEENDPOINTCACHE DataCache;
404
405	/** Flag whether a flush request is currently active */
406	PPDMACTASKFILE pFlushReq;
407
408	/** Event sempahore for blocking external events.
409	* The caller waits on it until the async I/O manager
410	* finished processing the event. */
411	RTSEMEVENT EventSemBlock;
412	/** Flag whether a blocking event is pending and needs
413	* processing by the I/O manager. */
414	bool fBlockingEventPending;
415	/** Blocking event type */
416	PDMACEPFILEBLOCKINGEVENT enmBlockingEvent;
417	/** Additional data needed for the event types. */
418	union
419	{
420	/** Cancelation event. */
421	struct
422	{
423	/** The task to cancel. */
424	PPDMACTASKFILE pTask;
425	} Cancel;
426	} BlockingEventData;
427	/** Data for exclusive use by the assigned async I/O manager. */
428	struct
429	{
430	/** Pointer to the next endpoint assigned to the manager. */
431	R3PTRTYPE(PPDMASYNCCOMPLETIONENDPOINTFILE) pEndpointNext;
432	/** Pointer to the previous endpoint assigned to the manager. */
433	R3PTRTYPE(PPDMASYNCCOMPLETIONENDPOINTFILE) pEndpointPrev;
434	/** List of pending requests (not submitted due to usage restrictions
435	* or a pending flush request) */
436	R3PTRTYPE(PPDMACTASKFILE) pReqsPendingHead;
437	/** Tail of pending requests. */
438	R3PTRTYPE(PPDMACTASKFILE) pReqsPendingTail;
439	/** Number of requests currently being processed for this endpoint
440	* (excluded flush requests). */
441	unsigned cRequestsActive;
442	/** Number of requests processed during the last second. */
443	unsigned cReqsPerSec;
444	/** Current number of processed requests for the current update period. */
445	unsigned cReqsProcessed;
446	} AioMgr;
447	} PDMASYNCCOMPLETIONENDPOINTFILE;
448	/** Pointer to the endpoint class data. */
449	typedef PDMASYNCCOMPLETIONENDPOINTFILE *PPDMASYNCCOMPLETIONENDPOINTFILE;
450
451	/** Request completion function */
452	typedef DECLCALLBACK(void) FNPDMACTASKCOMPLETED(PPDMACTASKFILE pTask, void *pvUser);
453	/** Pointer to a request completion function. */
454	typedef FNPDMACTASKCOMPLETED *PFNPDMACTASKCOMPLETED;
455
456	/**
457	* Transfer type.
458	*/
459	typedef enum PDMACTASKFILETRANSFER
460	{
461	/** Invalid. */
462	PDMACTASKFILETRANSFER_INVALID = 0,
463	/** Read transfer. */
464	PDMACTASKFILETRANSFER_READ,
465	/** Write transfer. */
466	PDMACTASKFILETRANSFER_WRITE,
467	/** Flush transfer. */
468	PDMACTASKFILETRANSFER_FLUSH
469	} PDMACTASKFILETRANSFER;
470
471	/**
472	* Data of a request.
473	*/
474	typedef struct PDMACTASKFILE
475	{
476	/** next task in the list. */
477	struct PDMACTASKFILE *pNext;
478	/** Endpoint */
479	PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint;
480	/** Transfer type. */
481	PDMACTASKFILETRANSFER enmTransferType;
482	/** Start offset */
483	RTFOFF Off;
484	/** Data segment. */
485	PDMDATASEG DataSeg;
486	/** Flag whether this segment uses a bounce buffer
487	* because the provided buffer doesn't meet host requirements. */
488	bool fBounceBuffer;
489	/** Pointer to the used bounce buffer if any. */
490	void *pvBounceBuffer;
491	/** Completion function to call on completion. */
492	PFNPDMACTASKCOMPLETED pfnCompleted;
493	/** User data */
494	void *pvUser;
495	} PDMACTASKFILE;
496
497	/**
498	* Per task data.
499	*/
500	typedef struct PDMASYNCCOMPLETIONTASKFILE
501	{
502	/** Common data. */
503	PDMASYNCCOMPLETIONTASK Core;
504	/** Number of bytes to transfer until this task completes. */
505	volatile int32_t cbTransferLeft;
506	/** Flag whether the task completed. */
507	volatile bool fCompleted;
508	} PDMASYNCCOMPLETIONTASKFILE;
509
510	int pdmacFileAioMgrFailsafe(RTTHREAD ThreadSelf, void *pvUser);
511	int pdmacFileAioMgrNormal(RTTHREAD ThreadSelf, void *pvUser);
512
513	int pdmacFileAioMgrNormalInit(PPDMACEPFILEMGR pAioMgr);
514	void pdmacFileAioMgrNormalDestroy(PPDMACEPFILEMGR pAioMgr);
515
516	PPDMACTASKFILE pdmacFileEpGetNewTasks(PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint);
517	PPDMACTASKFILE pdmacFileTaskAlloc(PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint);
518	void pdmacFileTaskFree(PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint,
519	PPDMACTASKFILE pTask);
520
521	int pdmacFileEpAddTask(PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint, PPDMACTASKFILE pTask);
522
523	void pdmacFileEpTaskCompleted(PPDMACTASKFILE pTask, void *pvUser);
524
525	int pdmacFileCacheInit(PPDMASYNCCOMPLETIONEPCLASSFILE pClassFile, PCFGMNODE pCfgNode);
526	void pdmacFileCacheDestroy(PPDMASYNCCOMPLETIONEPCLASSFILE pClassFile);
527	int pdmacFileEpCacheInit(PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint, PPDMASYNCCOMPLETIONEPCLASSFILE pClassFile);
528	void pdmacFileEpCacheDestroy(PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint);
529
530	int pdmacFileEpCacheRead(PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint, PPDMASYNCCOMPLETIONTASKFILE pTask,
531	RTFOFF off, PCPDMDATASEG paSegments, size_t cSegments,
532	size_t cbRead);
533	int pdmacFileEpCacheWrite(PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint, PPDMASYNCCOMPLETIONTASKFILE pTask,
534	RTFOFF off, PCPDMDATASEG paSegments, size_t cSegments,
535	size_t cbWrite);
536
537	RT_C_DECLS_END
538
539	#endif
540

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