aiomgr.cpp@ 57358

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1	/* $Id: aiomgr.cpp 57358 2015-08-14 15:16:38Z vboxsync $ */
2	/** @file
3	* IPRT - Async I/O manager.
4	*/
5
6	/*
7	* Copyright (C) 2013-2015 Oracle Corporation
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	* The contents of this file may alternatively be used under the terms
18	* of the Common Development and Distribution License Version 1.0
19	* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20	* VirtualBox OSE distribution, in which case the provisions of the
21	* CDDL are applicable instead of those of the GPL.
22	*
23	* You may elect to license modified versions of this file under the
24	* terms and conditions of either the GPL or the CDDL or both.
25	*/
26
27
28	/*********************************************************************************************************************************
29	* Header Files *
30	*********************************************************************************************************************************/
31
32	#include <iprt/aiomgr.h>
33	#include <iprt/err.h>
34	#include <iprt/asm.h>
35	#include <iprt/mem.h>
36	#include <iprt/file.h>
37	#include <iprt/list.h>
38	#include <iprt/thread.h>
39	#include <iprt/assert.h>
40	#include <iprt/string.h>
41	#include <iprt/critsect.h>
42	#include <iprt/memcache.h>
43	#include <iprt/semaphore.h>
44	#include <iprt/queueatomic.h>
45
46	#include "internal/magics.h"
47
48
49	/*********************************************************************************************************************************
50	* Structures and Typedefs *
51	*********************************************************************************************************************************/
52
53	/** Pointer to an internal async I/O file instance. */
54	typedef struct RTAIOMGRFILEINT *PRTAIOMGRFILEINT;
55
56	/**
57	* Blocking event types.
58	*/
59	typedef enum RTAIOMGREVENT
60	{
61	/** Invalid tye */
62	RTAIOMGREVENT_INVALID = 0,
63	/** No event pending. */
64	RTAIOMGREVENT_NO_EVENT,
65	/** A file is added to the manager. */
66	RTAIOMGREVENT_FILE_ADD,
67	/** A file is about to be closed. */
68	RTAIOMGREVENT_FILE_CLOSE,
69	/** The async I/O manager is shut down. */
70	RTAIOMGREVENT_SHUTDOWN,
71	/** 32bit hack */
72	RTAIOMGREVENT_32BIT_HACK = 0x7fffffff
73	} RTAIOMGREVENT;
74
75	/**
76	* Async I/O manager instance data.
77	*/
78	typedef struct RTAIOMGRINT
79	{
80	/** Magic value. */
81	uint32_t u32Magic;
82	/** Reference count. */
83	volatile uint32_t cRefs;
84	/** Async I/O context handle. */
85	RTFILEAIOCTX hAioCtx;
86	/** async I/O thread. */
87	RTTHREAD hThread;
88	/** List of files assigned to this manager. */
89	RTLISTANCHOR ListFiles;
90	/** Number of requests active currently. */
91	unsigned cReqsActive;
92	/** Number of maximum requests active. */
93	uint32_t cReqsActiveMax;
94	/** Memory cache for requests. */
95	RTMEMCACHE hMemCacheReqs;
96	/** Critical section protecting the blocking event handling. */
97	RTCRITSECT CritSectBlockingEvent;
98	/** Event semaphore for blocking external events.
99	* The caller waits on it until the async I/O manager
100	* finished processing the event. */
101	RTSEMEVENT hEventSemBlock;
102	/** Blocking event type */
103	volatile RTAIOMGREVENT enmBlockingEvent;
104	/** Event type data */
105	union
106	{
107	/** The file to be added */
108	volatile PRTAIOMGRFILEINT pFileAdd;
109	/** The file to be closed */
110	volatile PRTAIOMGRFILEINT pFileClose;
111	} BlockingEventData;
112	} RTAIOMGRINT;
113	/** Pointer to an internal async I/O manager instance. */
114	typedef RTAIOMGRINT *PRTAIOMGRINT;
115
116	/**
117	* Async I/O manager file instance data.
118	*/
119	typedef struct RTAIOMGRFILEINT
120	{
121	/** Magic value. */
122	uint32_t u32Magic;
123	/** Reference count. */
124	volatile uint32_t cRefs;
125	/** Flags. */
126	uint32_t fFlags;
127	/** Opaque user data passed on creation. */
128	void *pvUser;
129	/** File handle. */
130	RTFILE hFile;
131	/** async I/O manager this file belongs to. */
132	PRTAIOMGRINT pAioMgr;
133	/** Work queue for new requests. */
134	RTQUEUEATOMIC QueueReqs;
135	/** Completion callback for this file. */
136	PFNRTAIOMGRREQCOMPLETE pfnReqCompleted;
137	/** Data for exclusive use by the assigned async I/O manager. */
138	struct
139	{
140	/** List node of assigned files for a async I/O manager. */
141	RTLISTNODE NodeAioMgrFiles;
142	/** List of requests waiting for submission. */
143	RTLISTANCHOR ListWaitingReqs;
144	/** Number of requests currently being processed for this endpoint
145	* (excluded flush requests). */
146	unsigned cReqsActive;
147	} AioMgr;
148	} RTAIOMGRFILEINT;
149
150	/** Flag whether the file is closed. */
151	#define RTAIOMGRFILE_FLAGS_CLOSING RT_BIT_32(1)
152
153	/**
154	* Request type.
155	*/
156	typedef enum RTAIOMGRREQTYPE
157	{
158	/** Invalid request type. */
159	RTAIOMGRREQTYPE_INVALID = 0,
160	/** Read reques type. */
161	RTAIOMGRREQTYPE_READ,
162	/** Write request. */
163	RTAIOMGRREQTYPE_WRITE,
164	/** Flush request. */
165	RTAIOMGRREQTYPE_FLUSH,
166	/** Prefetech request. */
167	RTAIOMGRREQTYPE_PREFETCH,
168	/** 32bit hack. */
169	RTAIOMGRREQTYPE_32BIT_HACK = 0x7fffffff
170	} RTAIOMGRREQTYPE;
171	/** Pointer to a reques type. */
172	typedef RTAIOMGRREQTYPE *PRTAIOMGRREQTYPE;
173
174	/**
175	* Async I/O manager request.
176	*/
177	typedef struct RTAIOMGRREQ
178	{
179	/** Atomic queue work item. */
180	RTQUEUEATOMICITEM WorkItem;
181	/** Node for a waiting list. */
182	RTLISTNODE NodeWaitingList;
183	/** Request flags. */
184	uint32_t fFlags;
185	/** Transfer type. */
186	RTAIOMGRREQTYPE enmType;
187	/** Assigned file request. */
188	RTFILEAIOREQ hReqIo;
189	/** File the request belongs to. */
190	PRTAIOMGRFILEINT pFile;
191	/** Opaque user data. */
192	void *pvUser;
193	/** Start offset */
194	RTFOFF off;
195	/** Data segment. */
196	RTSGSEG DataSeg;
197	/** When non-zero the segment uses a bounce buffer because the provided buffer
198	* doesn't meet host requirements. */
199	size_t cbBounceBuffer;
200	/** Pointer to the used bounce buffer if any. */
201	void *pvBounceBuffer;
202	/** Start offset in the bounce buffer to copy from. */
203	uint32_t offBounceBuffer;
204	} RTAIOMGRREQ;
205	/** Pointer to a I/O manager request. */
206	typedef RTAIOMGRREQ *PRTAIOMGRREQ;
207
208	/** Flag whether the request was prepared already. */
209	#define RTAIOMGRREQ_FLAGS_PREPARED RT_BIT_32(0)
210
211
212	/*********************************************************************************************************************************
213	* Defined Constants And Macros *
214	*********************************************************************************************************************************/
215
216	/** Validates a handle and returns VERR_INVALID_HANDLE if not valid. */
217	#define RTAIOMGR_VALID_RETURN_RC(a_hAioMgr, a_rc) \
218	do { \
219	AssertPtrReturn((a_hAioMgr), (a_rc)); \
220	AssertReturn((a_hAioMgr)->u32Magic == RTAIOMGR_MAGIC, (a_rc)); \
221	} while (0)
222
223	/** Validates a handle and returns VERR_INVALID_HANDLE if not valid. */
224	#define RTAIOMGR_VALID_RETURN(a_hAioMgr) RTAIOMGR_VALID_RETURN_RC((hAioMgr), VERR_INVALID_HANDLE)
225
226	/** Validates a handle and returns (void) if not valid. */
227	#define RTAIOMGR_VALID_RETURN_VOID(a_hAioMgr) \
228	do { \
229	AssertPtrReturnVoid(a_hAioMgr); \
230	AssertReturnVoid((a_hAioMgr)->u32Magic == RTAIOMGR_MAGIC); \
231	} while (0)
232
233
234	/*********************************************************************************************************************************
235	* Internal Functions *
236	*********************************************************************************************************************************/
237
238	static int rtAioMgrReqsEnqueue(PRTAIOMGRINT pThis, PRTAIOMGRFILEINT pFile,
239	PRTFILEAIOREQ pahReqs, unsigned cReqs);
240
241	/**
242	* Removes an endpoint from the currently assigned manager.
243	*
244	* @returns TRUE if there are still requests pending on the current manager for this endpoint.
245	* FALSE otherwise.
246	* @param pEndpointRemove The endpoint to remove.
247	*/
248	static bool rtAioMgrFileRemove(PRTAIOMGRFILEINT pFile)
249	{
250	/* Make sure that there is no request pending on this manager for the endpoint. */
251	if (!pFile->AioMgr.cReqsActive)
252	{
253	RTListNodeRemove(&pFile->AioMgr.NodeAioMgrFiles);
254	return false;
255	}
256
257	return true;
258	}
259
260	/**
261	* Allocate a new I/O request.
262	*
263	* @returns Pointer to the allocated request or NULL if out of memory.
264	* @param pThis The async I/O manager instance.
265	*/
266	static PRTAIOMGRREQ rtAioMgrReqAlloc(PRTAIOMGRINT pThis)
267	{
268	return (PRTAIOMGRREQ)RTMemCacheAlloc(pThis->hMemCacheReqs);
269	}
270
271	/**
272	* Frees an I/O request.
273	*
274	* @returns nothing.
275	* @param pThis The async I/O manager instance.
276	* @param pReq The request to free.
277	*/
278	static void rtAioMgrReqFree(PRTAIOMGRINT pThis, PRTAIOMGRREQ pReq)
279	{
280	if (pReq->cbBounceBuffer)
281	{
282	AssertPtr(pReq->pvBounceBuffer);
283	RTMemPageFree(pReq->pvBounceBuffer, pReq->cbBounceBuffer);
284	pReq->pvBounceBuffer = NULL;
285	pReq->cbBounceBuffer = 0;
286	}
287	pReq->fFlags = 0;
288	RTAioMgrFileRelease(pReq->pFile);
289	RTMemCacheFree(pThis->hMemCacheReqs, pReq);
290	}
291
292	static void rtAioMgrReqCompleteRc(PRTAIOMGRINT pThis, PRTAIOMGRREQ pReq,
293	int rcReq, size_t cbTransfered)
294	{
295	int rc = VINF_SUCCESS;
296	PRTAIOMGRFILEINT pFile;
297
298	pFile = pReq->pFile;
299	pThis->cReqsActive--;
300	pFile->AioMgr.cReqsActive--;
301
302	/*
303	* It is possible that the request failed on Linux with kernels < 2.6.23
304	* if the passed buffer was allocated with remap_pfn_range or if the file
305	* is on an NFS endpoint which does not support async and direct I/O at the same time.
306	* The endpoint will be migrated to a failsafe manager in case a request fails.
307	*/
308	if (RT_FAILURE(rcReq))
309	{
310	pFile->pfnReqCompleted(pFile, rcReq, pReq->pvUser);
311	rtAioMgrReqFree(pThis, pReq);
312	}
313	else
314	{
315	/*
316	* Restart an incomplete transfer.
317	* This usually means that the request will return an error now
318	* but to get the cause of the error (disk full, file too big, I/O error, ...)
319	* the transfer needs to be continued.
320	*/
321	if (RT_UNLIKELY( cbTransfered < pReq->DataSeg.cbSeg
322	\|\| ( pReq->cbBounceBuffer
323	&& cbTransfered < pReq->cbBounceBuffer)))
324	{
325	RTFOFF offStart;
326	size_t cbToTransfer;
327	uint8_t *pbBuf = NULL;
328
329	Assert(cbTransfered % 512 == 0);
330
331	if (pReq->cbBounceBuffer)
332	{
333	AssertPtr(pReq->pvBounceBuffer);
334	offStart = (pReq->off & ~((RTFOFF)512-1)) + cbTransfered;
335	cbToTransfer = pReq->cbBounceBuffer - cbTransfered;
336	pbBuf = (uint8_t *)pReq->pvBounceBuffer + cbTransfered;
337	}
338	else
339	{
340	Assert(!pReq->pvBounceBuffer);
341	offStart = pReq->off + cbTransfered;
342	cbToTransfer = pReq->DataSeg.cbSeg - cbTransfered;
343	pbBuf = (uint8_t *)pReq->DataSeg.pvSeg + cbTransfered;
344	}
345
346	if ( pReq->enmType == RTAIOMGRREQTYPE_PREFETCH
347	\|\| pReq->enmType == RTAIOMGRREQTYPE_READ)
348	{
349	rc = RTFileAioReqPrepareRead(pReq->hReqIo, pFile->hFile, offStart,
350	pbBuf, cbToTransfer, pReq);
351	}
352	else
353	{
354	AssertMsg(pReq->enmType == RTAIOMGRREQTYPE_WRITE,
355	("Invalid transfer type\n"));
356	rc = RTFileAioReqPrepareWrite(pReq->hReqIo, pFile->hFile, offStart,
357	pbBuf, cbToTransfer, pReq);
358	}
359	AssertRC(rc);
360
361	rc = rtAioMgrReqsEnqueue(pThis, pFile, &pReq->hReqIo, 1);
362	AssertMsg(RT_SUCCESS(rc) \|\| (rc == VERR_FILE_AIO_INSUFFICIENT_RESSOURCES),
363	("Unexpected return code rc=%Rrc\n", rc));
364	}
365	else if (pReq->enmType == RTAIOMGRREQTYPE_PREFETCH)
366	{
367	Assert(pReq->cbBounceBuffer);
368	pReq->enmType = RTAIOMGRREQTYPE_WRITE;
369
370	memcpy(((uint8_t *)pReq->pvBounceBuffer) + pReq->offBounceBuffer,
371	pReq->DataSeg.pvSeg,
372	pReq->DataSeg.cbSeg);
373
374	/* Write it now. */
375	RTFOFF offStart = pReq->off & ~(RTFOFF)(512-1);
376	size_t cbToTransfer = RT_ALIGN_Z(pReq->DataSeg.cbSeg + (pReq->off - offStart), 512);
377
378	rc = RTFileAioReqPrepareWrite(pReq->hReqIo, pFile->hFile,
379	offStart, pReq->pvBounceBuffer, cbToTransfer, pReq);
380	AssertRC(rc);
381	rc = rtAioMgrReqsEnqueue(pThis, pFile, &pReq->hReqIo, 1);
382	AssertMsg(RT_SUCCESS(rc) \|\| (rc == VERR_FILE_AIO_INSUFFICIENT_RESSOURCES),
383	("Unexpected return code rc=%Rrc\n", rc));
384	}
385	else
386	{
387	if (RT_SUCCESS(rc) && pReq->cbBounceBuffer)
388	{
389	if (pReq->enmType == RTAIOMGRREQTYPE_READ)
390	memcpy(pReq->DataSeg.pvSeg,
391	((uint8_t *)pReq->pvBounceBuffer) + pReq->offBounceBuffer,
392	pReq->DataSeg.cbSeg);
393	}
394
395	/* Call completion callback */
396	pFile->pfnReqCompleted(pFile, rcReq, pReq->pvUser);
397	rtAioMgrReqFree(pThis, pReq);
398	}
399	} /* request completed successfully */
400	}
401
402	/**
403	* Wrapper around rtAioMgrReqCompleteRc().
404	*/
405	static void rtAioMgrReqComplete(PRTAIOMGRINT pThis, RTFILEAIOREQ hReq)
406	{
407	size_t cbTransfered = 0;
408	int rcReq = RTFileAioReqGetRC(hReq, &cbTransfered);
409	PRTAIOMGRREQ pReq = (PRTAIOMGRREQ)RTFileAioReqGetUser(hReq);
410
411	rtAioMgrReqCompleteRc(pThis, pReq, rcReq, cbTransfered);
412	}
413
414	/**
415	* Wrapper around RTFIleAioCtxSubmit() which is also doing error handling.
416	*/
417	static int rtAioMgrReqsEnqueue(PRTAIOMGRINT pThis, PRTAIOMGRFILEINT pFile,
418	PRTFILEAIOREQ pahReqs, unsigned cReqs)
419	{
420	pThis->cReqsActive += cReqs;
421	pFile->AioMgr.cReqsActive += cReqs;
422
423	int rc = RTFileAioCtxSubmit(pThis->hAioCtx, pahReqs, cReqs);
424	if (RT_FAILURE(rc))
425	{
426	if (rc == VERR_FILE_AIO_INSUFFICIENT_RESSOURCES)
427	{
428	/* Append any not submitted task to the waiting list. */
429	for (size_t i = 0; i < cReqs; i++)
430	{
431	int rcReq = RTFileAioReqGetRC(pahReqs[i], NULL);
432
433	if (rcReq != VERR_FILE_AIO_IN_PROGRESS)
434	{
435	PRTAIOMGRREQ pReq = (PRTAIOMGRREQ)RTFileAioReqGetUser(pahReqs[i]);
436
437	Assert(pReq->hReqIo == pahReqs[i]);
438	RTListAppend(&pFile->AioMgr.ListWaitingReqs, &pReq->NodeWaitingList);
439	pThis->cReqsActive--;
440	pFile->AioMgr.cReqsActive--;
441	}
442	}
443
444	pThis->cReqsActiveMax = pThis->cReqsActive;
445	rc = VINF_SUCCESS;
446	}
447	else /* Another kind of error happened (full disk, ...) */
448	{
449	/* An error happened. Find out which one caused the error and resubmit all other tasks. */
450	for (size_t i = 0; i < cReqs; i++)
451	{
452	PRTAIOMGRREQ pReq = (PRTAIOMGRREQ)RTFileAioReqGetUser(pahReqs[i]);
453	int rcReq = RTFileAioReqGetRC(pahReqs[i], NULL);
454
455	if (rcReq == VERR_FILE_AIO_NOT_SUBMITTED)
456	{
457	/* We call ourself again to do any error handling which might come up now. */
458	rc = rtAioMgrReqsEnqueue(pThis, pFile, &pahReqs[i], 1);
459	AssertRC(rc);
460	}
461	else if (rcReq != VERR_FILE_AIO_IN_PROGRESS)
462	rtAioMgrReqCompleteRc(pThis, pReq, rcReq, 0);
463	}
464	}
465	}
466
467	return VINF_SUCCESS;
468	}
469
470	/**
471	* Adds a list of requests to the waiting list.
472	*
473	* @returns nothing.
474	* @param pFile The file instance to add the requests to.
475	* @param pReqsHead The head of the request list to add.
476	*/
477	static void rtAioMgrFileAddReqsToWaitingList(PRTAIOMGRFILEINT pFile, PRTAIOMGRREQ pReqsHead)
478	{
479	while (pReqsHead)
480	{
481	PRTAIOMGRREQ pReqCur = pReqsHead;
482
483	pReqsHead = (PRTAIOMGRREQ)pReqsHead->WorkItem.pNext;
484	pReqCur->WorkItem.pNext = NULL;
485	RTListAppend(&pFile->AioMgr.ListWaitingReqs, &pReqCur->NodeWaitingList);
486	}
487	}
488
489	/**
490	* Prepare the native I/o request ensuring that all alignment prerequisites of
491	* the host are met.
492	*
493	* @returns IPRT statuse code.
494	* @param pFile The file instance data.
495	* @param pReq The request to prepare.
496	*/
497	static int rtAioMgrReqPrepareNonBuffered(PRTAIOMGRFILEINT pFile, PRTAIOMGRREQ pReq)
498	{
499	int rc = VINF_SUCCESS;
500	RTFOFF offStart = pReq->off & ~(RTFOFF)(512-1);
501	size_t cbToTransfer = RT_ALIGN_Z(pReq->DataSeg.cbSeg + (pReq->off - offStart), 512);
502	void *pvBuf = pReq->DataSeg.pvSeg;
503	bool fAlignedReq = cbToTransfer == pReq->DataSeg.cbSeg
504	&& offStart == pReq->off;
505
506	/*
507	* Check if the alignment requirements are met.
508	* Offset, transfer size and buffer address
509	* need to be on a 512 boundary.
510	*/
511	if ( !fAlignedReq
512	/** @todo: \|\| ((pEpClassFile->uBitmaskAlignment & (RTR3UINTPTR)pvBuf) != (RTR3UINTPTR)pvBuf) */)
513	{
514	/* Create bounce buffer. */
515	pReq->cbBounceBuffer = cbToTransfer;
516
517	AssertMsg(pReq->off >= offStart, ("Overflow in calculation off=%llu offStart=%llu\n",
518	pReq->off, offStart));
519	pReq->offBounceBuffer = pReq->off - offStart;
520
521	/** @todo: I think we need something like a RTMemAllocAligned method here.
522	* Current assumption is that the maximum alignment is 4096byte
523	* (GPT disk on Windows)
524	* so we can use RTMemPageAlloc here.
525	*/
526	pReq->pvBounceBuffer = RTMemPageAlloc(cbToTransfer);
527	if (RT_LIKELY(pReq->pvBounceBuffer))
528	{
529	pvBuf = pReq->pvBounceBuffer;
530
531	if (pReq->enmType == RTAIOMGRREQTYPE_WRITE)
532	{
533	if ( RT_UNLIKELY(cbToTransfer != pReq->DataSeg.cbSeg)
534	\|\| RT_UNLIKELY(offStart != pReq->off))
535	{
536	/* We have to fill the buffer first before we can update the data. */
537	pReq->enmType = RTAIOMGRREQTYPE_WRITE;
538	}
539	else
540	memcpy(pvBuf, pReq->DataSeg.pvSeg, pReq->DataSeg.cbSeg);
541	}
542	}
543	else
544	rc = VERR_NO_MEMORY;
545	}
546	else
547	pReq->cbBounceBuffer = 0;
548
549	if (RT_SUCCESS(rc))
550	{
551	if (pReq->enmType == RTAIOMGRREQTYPE_WRITE)
552	{
553	rc = RTFileAioReqPrepareWrite(pReq->hReqIo, pFile->hFile,
554	offStart, pvBuf, cbToTransfer, pReq);
555	}
556	else /* Read or prefetch request. */
557	rc = RTFileAioReqPrepareRead(pReq->hReqIo, pFile->hFile,
558	offStart, pvBuf, cbToTransfer, pReq);
559	AssertRC(rc);
560	pReq->fFlags \|= RTAIOMGRREQ_FLAGS_PREPARED;
561	}
562
563	return rc;
564	}
565
566	/**
567	* Prepare a new request for enqueuing.
568	*
569	* @returns IPRT status code.
570	* @param pReq The request to prepare.
571	* @param phReqIo Where to store the handle to the native I/O request on success.
572	*/
573	static int rtAioMgrPrepareReq(PRTAIOMGRREQ pReq, PRTFILEAIOREQ phReqIo)
574	{
575	int rc = VINF_SUCCESS;
576	PRTAIOMGRFILEINT pFile = pReq->pFile;
577
578	switch (pReq->enmType)
579	{
580	case RTAIOMGRREQTYPE_FLUSH:
581	{
582	rc = RTFileAioReqPrepareFlush(pReq->hReqIo, pFile->hFile, pReq);
583	break;
584	}
585	case RTAIOMGRREQTYPE_READ:
586	case RTAIOMGRREQTYPE_WRITE:
587	{
588	rc = rtAioMgrReqPrepareNonBuffered(pFile, pReq);
589	break;
590	}
591	default:
592	AssertMsgFailed(("Invalid transfer type %d\n", pReq->enmType));
593	} /* switch transfer type */
594
595	if (RT_SUCCESS(rc))
596	*phReqIo = pReq->hReqIo;
597
598	return rc;
599	}
600
601	/**
602	* Prepare newly submitted requests for processing.
603	*
604	* @returns IPRT status code
605	* @param pThis The async I/O manager instance data.
606	* @param pFile The file instance.
607	* @param pReqsNew The list of new requests to prepare.
608	*/
609	static int rtAioMgrPrepareNewReqs(PRTAIOMGRINT pThis,
610	PRTAIOMGRFILEINT pFile,
611	PRTAIOMGRREQ pReqsNew)
612	{
613	RTFILEAIOREQ apReqs[20];
614	unsigned cRequests = 0;
615	int rc = VINF_SUCCESS;
616
617	/* Go through the list and queue the requests. */
618	while ( pReqsNew
619	&& (pThis->cReqsActive + cRequests < pThis->cReqsActiveMax)
620	&& RT_SUCCESS(rc))
621	{
622	PRTAIOMGRREQ pCurr = pReqsNew;
623	pReqsNew = (PRTAIOMGRREQ)pReqsNew->WorkItem.pNext;
624
625	pCurr->WorkItem.pNext = NULL;
626	AssertMsg(VALID_PTR(pCurr->pFile) && (pCurr->pFile == pFile),
627	("Files do not match\n"));
628	AssertMsg(!(pCurr->fFlags & RTAIOMGRREQ_FLAGS_PREPARED),
629	("Request on the new list is already prepared\n"));
630
631	rc = rtAioMgrPrepareReq(pCurr, &apReqs[cRequests]);
632	if (RT_FAILURE(rc))
633	rtAioMgrReqCompleteRc(pThis, pCurr, rc, 0);
634	else
635	cRequests++;
636
637	/* Queue the requests if the array is full. */
638	if (cRequests == RT_ELEMENTS(apReqs))
639	{
640	rc = rtAioMgrReqsEnqueue(pThis, pFile, apReqs, cRequests);
641	cRequests = 0;
642	AssertMsg(RT_SUCCESS(rc) \|\| (rc == VERR_FILE_AIO_INSUFFICIENT_RESSOURCES),
643	("Unexpected return code\n"));
644	}
645	}
646
647	if (cRequests)
648	{
649	rc = rtAioMgrReqsEnqueue(pThis, pFile, apReqs, cRequests);
650	AssertMsg(RT_SUCCESS(rc) \|\| (rc == VERR_FILE_AIO_INSUFFICIENT_RESSOURCES),
651	("Unexpected return code rc=%Rrc\n", rc));
652	}
653
654	if (pReqsNew)
655	{
656	/* Add the rest of the tasks to the pending list */
657	rtAioMgrFileAddReqsToWaitingList(pFile, pReqsNew);
658	}
659
660	/* Insufficient resources are not fatal. */
661	if (rc == VERR_FILE_AIO_INSUFFICIENT_RESSOURCES)
662	rc = VINF_SUCCESS;
663
664	return rc;
665	}
666
667	/**
668	* Queues waiting requests.
669	*
670	* @returns IPRT status code.
671	* @param pThis The async I/O manager instance data.
672	* @param pFile The file to get the requests from.
673	*/
674	static int rtAioMgrQueueWaitingReqs(PRTAIOMGRINT pThis, PRTAIOMGRFILEINT pFile)
675	{
676	RTFILEAIOREQ apReqs[20];
677	unsigned cRequests = 0;
678	int rc = VINF_SUCCESS;
679	PRTAIOMGRREQ pReqIt;
680	PRTAIOMGRREQ pReqItNext;
681
682	/* Go through the list and queue the requests. */
683	RTListForEachSafe(&pFile->AioMgr.ListWaitingReqs, pReqIt, pReqItNext, RTAIOMGRREQ, NodeWaitingList)
684	{
685	RTListNodeRemove(&pReqIt->NodeWaitingList);
686	AssertMsg(VALID_PTR(pReqIt->pFile) && (pReqIt->pFile == pFile),
687	("Files do not match\n"));
688
689	if (!(pReqIt->fFlags & RTAIOMGRREQ_FLAGS_PREPARED))
690	{
691	rc = rtAioMgrPrepareReq(pReqIt, &apReqs[cRequests]);
692	if (RT_FAILURE(rc))
693	rtAioMgrReqCompleteRc(pThis, pReqIt, rc, 0);
694	else
695	cRequests++;
696	}
697	else
698	{
699	apReqs[cRequests] = pReqIt->hReqIo;
700	cRequests++;
701	}
702
703	/* Queue the requests if the array is full. */
704	if (cRequests == RT_ELEMENTS(apReqs))
705	{
706	rc = rtAioMgrReqsEnqueue(pThis, pFile, apReqs, cRequests);
707	cRequests = 0;
708	AssertMsg(RT_SUCCESS(rc) \|\| (rc == VERR_FILE_AIO_INSUFFICIENT_RESSOURCES),
709	("Unexpected return code\n"));
710	}
711	}
712
713	if (cRequests)
714	{
715	rc = rtAioMgrReqsEnqueue(pThis, pFile, apReqs, cRequests);
716	AssertMsg(RT_SUCCESS(rc) \|\| (rc == VERR_FILE_AIO_INSUFFICIENT_RESSOURCES),
717	("Unexpected return code rc=%Rrc\n", rc));
718	}
719
720	/* Insufficient resources are not fatal. */
721	if (rc == VERR_FILE_AIO_INSUFFICIENT_RESSOURCES)
722	rc = VINF_SUCCESS;
723
724	return rc;
725	}
726
727	/**
728	* Adds all pending requests for the given file.
729	*
730	* @returns IPRT status code.
731	* @param pThis The async I/O manager instance data.
732	* @param pFile The file to get the requests from.
733	*/
734	static int rtAioMgrQueueReqs(PRTAIOMGRINT pThis, PRTAIOMGRFILEINT pFile)
735	{
736	int rc = VINF_SUCCESS;
737	PRTAIOMGRFILEINT pReqsHead = NULL;
738
739	/* Check the pending list first */
740	if (!RTListIsEmpty(&pFile->AioMgr.ListWaitingReqs))
741	rc = rtAioMgrQueueWaitingReqs(pThis, pFile);
742
743	if ( RT_SUCCESS(rc)
744	&& RTListIsEmpty(&pFile->AioMgr.ListWaitingReqs))
745	{
746	PRTAIOMGRREQ pReqsNew = (PRTAIOMGRREQ)RTQueueAtomicRemoveAll(&pFile->QueueReqs);
747
748	if (pReqsNew)
749	{
750	rc = rtAioMgrPrepareNewReqs(pThis, pFile, pReqsNew);
751	AssertRC(rc);
752	}
753	}
754
755	return rc;
756	}
757
758	/**
759	* Checks all files for new requests.
760	*
761	* @returns IPRT status code.
762	* @param pThis The I/O manager instance data.
763	*/
764	static int rtAioMgrCheckFiles(PRTAIOMGRINT pThis)
765	{
766	int rc = VINF_SUCCESS;
767	PRTAIOMGRFILEINT pIt;
768
769	RTListForEach(&pThis->ListFiles, pIt, RTAIOMGRFILEINT, AioMgr.NodeAioMgrFiles)
770	{
771	rc = rtAioMgrQueueReqs(pThis, pIt);
772	if (RT_FAILURE(rc))
773	return rc;
774	}
775
776	return rc;
777	}
778
779	/**
780	* Process a blocking event from the outside.
781	*
782	* @returns IPRT status code.
783	* @param pThis The async I/O manager instance data.
784	*/
785	static int rtAioMgrProcessBlockingEvent(PRTAIOMGRINT pThis)
786	{
787	int rc = VINF_SUCCESS;
788	bool fNotifyWaiter = false;
789
790	switch (pThis->enmBlockingEvent)
791	{
792	case RTAIOMGREVENT_NO_EVENT:
793	/* Nothing to do. */
794	break;
795	case RTAIOMGREVENT_FILE_ADD:
796	{
797	PRTAIOMGRFILEINT pFile = ASMAtomicReadPtrT(&pThis->BlockingEventData.pFileAdd, PRTAIOMGRFILEINT);
798	AssertMsg(VALID_PTR(pFile), ("Adding file event without a file to add\n"));
799
800	RTListAppend(&pThis->ListFiles, &pFile->AioMgr.NodeAioMgrFiles);
801	fNotifyWaiter = true;
802	break;
803	}
804	case RTAIOMGREVENT_FILE_CLOSE:
805	{
806	PRTAIOMGRFILEINT pFile = ASMAtomicReadPtrT(&pThis->BlockingEventData.pFileClose, PRTAIOMGRFILEINT);
807	AssertMsg(VALID_PTR(pFile), ("Close file event without a file to close\n"));
808
809	if (!(pFile->fFlags & RTAIOMGRFILE_FLAGS_CLOSING))
810	{
811	/* Make sure all requests finished. Process the queues a last time first. */
812	rc = rtAioMgrQueueReqs(pThis, pFile);
813	AssertRC(rc);
814
815	pFile->fFlags \|= RTAIOMGRFILE_FLAGS_CLOSING;
816	fNotifyWaiter = !rtAioMgrFileRemove(pFile);
817	}
818	else if (!pFile->AioMgr.cReqsActive)
819	fNotifyWaiter = true;
820	break;
821	}
822	case RTAIOMGREVENT_SHUTDOWN:
823	{
824	if (!pThis->cReqsActive)
825	fNotifyWaiter = true;
826	break;
827	}
828	default:
829	AssertReleaseMsgFailed(("Invalid event type %d\n", pThis->enmBlockingEvent));
830	}
831
832	if (fNotifyWaiter)
833	{
834	/* Release the waiting thread. */
835	rc = RTSemEventSignal(pThis->hEventSemBlock);
836	AssertRC(rc);
837	}
838
839	return rc;
840	}
841
842	/**
843	* async I/O manager worker loop.
844	*
845	* @returns IPRT status code.
846	* @param hThreadSelf The thread handle this worker belongs to.
847	* @param pvUser Opaque user data (Pointer to async I/O manager instance).
848	*/
849	static DECLCALLBACK(int) rtAioMgrWorker(RTTHREAD hThreadSelf, void *pvUser)
850	{
851	PRTAIOMGRINT pThis = (PRTAIOMGRINT)pvUser;
852	bool fRunning = true;
853	int rc = VINF_SUCCESS;
854
855	do
856	{
857	uint32_t cReqsCompleted = 0;
858	RTFILEAIOREQ ahReqsCompleted[32];
859	rc = RTFileAioCtxWait(pThis->hAioCtx, 1, RT_INDEFINITE_WAIT, &ahReqsCompleted[0],
860	RT_ELEMENTS(ahReqsCompleted), &cReqsCompleted);
861	if (rc == VERR_INTERRUPTED)
862	{
863	/* Process external event. */
864	rtAioMgrProcessBlockingEvent(pThis);
865	rc = rtAioMgrCheckFiles(pThis);
866	}
867	else if (RT_FAILURE(rc))
868	{
869	/* Something bad happened. */
870	/** @todo: */
871	}
872	else
873	{
874	/* Requests completed. */
875	for (uint32_t i = 0; i < cReqsCompleted; i++)
876	rtAioMgrReqComplete(pThis, ahReqsCompleted[i]);
877
878	/* Check files for new requests and queue waiting requests. */
879	rc = rtAioMgrCheckFiles(pThis);
880	}
881	} while ( fRunning
882	&& RT_SUCCESS(rc));
883
884	return rc;
885	}
886
887	/**
888	* Wakes up the async I/O manager.
889	*
890	* @returns IPRT status code.
891	* @param pThis The async I/O manager.
892	*/
893	static int rtAioMgrWakeup(PRTAIOMGRINT pThis)
894	{
895	return RTFileAioCtxWakeup(pThis->hAioCtx);
896	}
897
898	/**
899	* Waits until the async I/O manager handled the given event.
900	*
901	* @returns IPRT status code.
902	* @param pThis The async I/O manager.
903	* @param enmEvent The event to pass to the manager.
904	*/
905	static int rtAioMgrWaitForBlockingEvent(PRTAIOMGRINT pThis, RTAIOMGREVENT enmEvent)
906	{
907	Assert(pThis->enmBlockingEvent == RTAIOMGREVENT_NO_EVENT);
908	ASMAtomicWriteU32((volatile uint32_t *)&pThis->enmBlockingEvent, enmEvent);
909
910	/* Wakeup the async I/O manager */
911	int rc = rtAioMgrWakeup(pThis);
912	if (RT_FAILURE(rc))
913	return rc;
914
915	/* Wait for completion. */
916	rc = RTSemEventWait(pThis->hEventSemBlock, RT_INDEFINITE_WAIT);
917	AssertRC(rc);
918
919	ASMAtomicWriteU32((volatile uint32_t *)&pThis->enmBlockingEvent, RTAIOMGREVENT_NO_EVENT);
920
921	return rc;
922	}
923
924	/**
925	* Add a given file to the given I/O manager.
926	*
927	* @returns IPRT status code.
928	* @param pThis The async I/O manager.
929	* @param pFile The file to add.
930	*/
931	static int rtAioMgrAddFile(PRTAIOMGRINT pThis, PRTAIOMGRFILEINT pFile)
932	{
933	/* Update the assigned I/O manager. */
934	ASMAtomicWritePtr(&pFile->pAioMgr, pThis);
935
936	int rc = RTCritSectEnter(&pThis->CritSectBlockingEvent);
937	AssertRCReturn(rc, rc);
938
939	ASMAtomicWritePtr(&pThis->BlockingEventData.pFileAdd, pFile);
940	rc = rtAioMgrWaitForBlockingEvent(pThis, RTAIOMGREVENT_FILE_ADD);
941	ASMAtomicWriteNullPtr(&pThis->BlockingEventData.pFileAdd);
942
943	RTCritSectLeave(&pThis->CritSectBlockingEvent);
944	return rc;
945	}
946
947	/**
948	* Removes a given file from the given I/O manager.
949	*
950	* @returns IPRT status code.
951	* @param pThis The async I/O manager.
952	* @param pFile The file to remove.
953	*/
954	static int rtAioMgrCloseFile(PRTAIOMGRINT pThis, PRTAIOMGRFILEINT pFile)
955	{
956	int rc = RTCritSectEnter(&pThis->CritSectBlockingEvent);
957	AssertRCReturn(rc, rc);
958
959	ASMAtomicWritePtr(&pThis->BlockingEventData.pFileClose, pFile);
960	rc = rtAioMgrWaitForBlockingEvent(pThis, RTAIOMGREVENT_FILE_CLOSE);
961	ASMAtomicWriteNullPtr(&pThis->BlockingEventData.pFileClose);
962
963	RTCritSectLeave(&pThis->CritSectBlockingEvent);
964
965	return rc;
966	}
967
968	/**
969	* Process a shutdown event.
970	*
971	* @returns IPRT status code.
972	* @param pThis The async I/O manager to shut down.
973	*/
974	static int rtAioMgrShutdown(PRTAIOMGRINT pThis)
975	{
976	int rc = RTCritSectEnter(&pThis->CritSectBlockingEvent);
977	AssertRCReturn(rc, rc);
978
979	rc = rtAioMgrWaitForBlockingEvent(pThis, RTAIOMGREVENT_SHUTDOWN);
980	RTCritSectLeave(&pThis->CritSectBlockingEvent);
981
982	return rc;
983	}
984
985	/**
986	* Destroys an async I/O manager.
987	*
988	* @returns nothing.
989	* @param pThis The async I/O manager instance to destroy.
990	*/
991	static void rtAioMgrDestroy(PRTAIOMGRINT pThis)
992	{
993	int rc;
994
995	rc = rtAioMgrShutdown(pThis);
996	AssertRC(rc);
997
998	rc = RTThreadWait(pThis->hThread, RT_INDEFINITE_WAIT, NULL);
999	AssertRC(rc);
1000
1001	rc = RTFileAioCtxDestroy(pThis->hAioCtx);
1002	AssertRC(rc);
1003
1004	rc = RTMemCacheDestroy(pThis->hMemCacheReqs);
1005	AssertRC(rc);
1006
1007	pThis->hThread = NIL_RTTHREAD;
1008	pThis->hAioCtx = NIL_RTFILEAIOCTX;
1009	pThis->hMemCacheReqs = NIL_RTMEMCACHE;
1010	pThis->u32Magic = ~RTAIOMGR_MAGIC;
1011	RTCritSectDelete(&pThis->CritSectBlockingEvent);
1012	RTSemEventDestroy(pThis->hEventSemBlock);
1013	RTMemFree(pThis);
1014	}
1015
1016	/**
1017	* Queues a new request for processing.
1018	*/
1019	static void rtAioMgrFileQueueReq(PRTAIOMGRFILEINT pThis, PRTAIOMGRREQ pReq)
1020	{
1021	RTAioMgrFileRetain(pThis);
1022	RTQueueAtomicInsert(&pThis->QueueReqs, &pReq->WorkItem);
1023	rtAioMgrWakeup(pThis->pAioMgr);
1024	}
1025
1026	/**
1027	* Destroys an async I/O manager file.
1028	*
1029	* @returns nothing.
1030	* @param pThis The async I/O manager file.
1031	*/
1032	static void rtAioMgrFileDestroy(PRTAIOMGRFILEINT pThis)
1033	{
1034	pThis->u32Magic = ~RTAIOMGRFILE_MAGIC;
1035	rtAioMgrCloseFile(pThis->pAioMgr, pThis);
1036	RTAioMgrRelease(pThis->pAioMgr);
1037	RTMemFree(pThis);
1038	}
1039
1040	/**
1041	* Queues a new I/O request.
1042	*
1043	* @returns IPRT status code.
1044	* @param hAioMgrFile The I/O manager file handle.
1045	* @param off Start offset of the I/o request.
1046	* @param pSgBuf Data S/G buffer.
1047	* @param cbIo How much to transfer.
1048	* @param pvUser Opaque user data.
1049	* @param enmType I/O direction type (read/write).
1050	*/
1051	static int rtAioMgrFileIoReqCreate(RTAIOMGRFILE hAioMgrFile, RTFOFF off, PRTSGBUF pSgBuf,
1052	size_t cbIo, void *pvUser, RTAIOMGRREQTYPE enmType)
1053	{
1054	int rc;
1055	PRTAIOMGRFILEINT pFile = hAioMgrFile;
1056	PRTAIOMGRINT pAioMgr;
1057
1058	AssertPtrReturn(pFile, VERR_INVALID_HANDLE);
1059	pAioMgr = pFile->pAioMgr;
1060
1061	PRTAIOMGRREQ pReq = rtAioMgrReqAlloc(pAioMgr);
1062	if (RT_LIKELY(pReq))
1063	{
1064	unsigned cSeg = 1;
1065	size_t cbSeg = RTSgBufSegArrayCreate(pSgBuf, &pReq->DataSeg, &cSeg, cbIo);
1066
1067	if (cbSeg == cbIo)
1068	{
1069	pReq->enmType = enmType;
1070	pReq->pFile = pFile;
1071	pReq->pvUser = pvUser;
1072	pReq->off = off;
1073	rtAioMgrFileQueueReq(pFile, pReq);
1074	rc = VERR_FILE_AIO_IN_PROGRESS;
1075	}
1076	else
1077	{
1078	/** @todo: Real S/G buffer support. */
1079	rtAioMgrReqFree(pAioMgr, pReq);
1080	rc = VERR_NOT_SUPPORTED;
1081	}
1082	}
1083	else
1084	rc = VERR_NO_MEMORY;
1085
1086	return rc;
1087	}
1088
1089	/**
1090	* Request constructor for the memory cache.
1091	*
1092	* @returns IPRT status code.
1093	* @param hMemCache The cache handle.
1094	* @param pvObj The memory object that should be initialized.
1095	* @param pvUser The user argument.
1096	*/
1097	static DECLCALLBACK(int) rtAioMgrReqCtor(RTMEMCACHE hMemCache, void pvObj, void pvUser)
1098	{
1099	PRTAIOMGRREQ pReq = (PRTAIOMGRREQ)pvObj;
1100
1101	memset(pReq, 0, sizeof(RTAIOMGRREQ));
1102	return RTFileAioReqCreate(&pReq->hReqIo);
1103	}
1104
1105	/**
1106	* Request destructor for the memory cache.
1107	*
1108	* @param hMemCache The cache handle.
1109	* @param pvObj The memory object that should be destroyed.
1110	* @param pvUser The user argument.
1111	*/
1112	static DECLCALLBACK(void) rtAioMgrReqDtor(RTMEMCACHE hMemCache, void pvObj, void pvUser)
1113	{
1114	PRTAIOMGRREQ pReq = (PRTAIOMGRREQ)pvObj;
1115	int rc = RTFileAioReqDestroy(pReq->hReqIo);
1116
1117	AssertRC(rc);
1118	}
1119
1120	RTDECL(int) RTAioMgrCreate(PRTAIOMGR phAioMgr, uint32_t cReqsMax)
1121	{
1122	int rc = VINF_SUCCESS;
1123	PRTAIOMGRINT pThis;
1124
1125	AssertPtrReturn(phAioMgr, VERR_INVALID_POINTER);
1126	AssertReturn(cReqsMax > 0, VERR_INVALID_PARAMETER);
1127
1128	pThis = (PRTAIOMGRINT)RTMemAllocZ(sizeof(RTAIOMGRINT));
1129	if (pThis)
1130	{
1131	pThis->u32Magic = RTAIOMGR_MAGIC;
1132	pThis->cRefs = 1;
1133	pThis->enmBlockingEvent = RTAIOMGREVENT_NO_EVENT;
1134	RTListInit(&pThis->ListFiles);
1135	rc = RTCritSectInit(&pThis->CritSectBlockingEvent);
1136	if (RT_SUCCESS(rc))
1137	{
1138	rc = RTSemEventCreate(&pThis->hEventSemBlock);
1139	if (RT_SUCCESS(rc))
1140	{
1141	rc = RTMemCacheCreate(&pThis->hMemCacheReqs, sizeof(RTAIOMGRREQ),
1142	0, UINT32_MAX, rtAioMgrReqCtor, rtAioMgrReqDtor, NULL, 0);
1143	if (RT_SUCCESS(rc))
1144	{
1145	rc = RTFileAioCtxCreate(&pThis->hAioCtx, cReqsMax == UINT32_MAX
1146	? RTFILEAIO_UNLIMITED_REQS
1147	: cReqsMax,
1148	RTFILEAIOCTX_FLAGS_WAIT_WITHOUT_PENDING_REQUESTS);
1149	if (RT_SUCCESS(rc))
1150	{
1151	rc = RTThreadCreateF(&pThis->hThread, rtAioMgrWorker, pThis, 0, RTTHREADTYPE_IO,
1152	RTTHREADFLAGS_WAITABLE, "AioMgr-%u", cReqsMax);
1153	if (RT_FAILURE(rc))
1154	{
1155	rc = RTFileAioCtxDestroy(pThis->hAioCtx);
1156	AssertRC(rc);
1157	}
1158	}
1159
1160	if (RT_FAILURE(rc))
1161	RTMemCacheDestroy(pThis->hMemCacheReqs);
1162	}
1163
1164	if (RT_FAILURE(rc))
1165	RTSemEventDestroy(pThis->hEventSemBlock);
1166	}
1167
1168	if (RT_FAILURE(rc))
1169	RTCritSectDelete(&pThis->CritSectBlockingEvent);
1170	}
1171
1172	if (RT_FAILURE(rc))
1173	RTMemFree(pThis);
1174	}
1175	else
1176	rc = VERR_NO_MEMORY;
1177
1178	if (RT_SUCCESS(rc))
1179	*phAioMgr = pThis;
1180
1181	return rc;
1182	}
1183
1184	RTDECL(uint32_t) RTAioMgrRetain(RTAIOMGR hAioMgr)
1185	{
1186	PRTAIOMGRINT pThis = hAioMgr;
1187	AssertReturn(hAioMgr != NIL_RTAIOMGR, UINT32_MAX);
1188	AssertPtrReturn(pThis, UINT32_MAX);
1189	AssertReturn(pThis->u32Magic == RTAIOMGR_MAGIC, UINT32_MAX);
1190
1191	uint32_t cRefs = ASMAtomicIncU32(&pThis->cRefs);
1192	AssertMsg(cRefs > 1 && cRefs < _1G, ("%#x %p\n", cRefs, pThis));
1193	return cRefs;
1194	}
1195
1196	RTDECL(uint32_t) RTAioMgrRelease(RTAIOMGR hAioMgr)
1197	{
1198	PRTAIOMGRINT pThis = hAioMgr;
1199	if (pThis == NIL_RTAIOMGR)
1200	return 0;
1201	AssertPtrReturn(pThis, UINT32_MAX);
1202	AssertReturn(pThis->u32Magic == RTAIOMGR_MAGIC, UINT32_MAX);
1203
1204	uint32_t cRefs = ASMAtomicDecU32(&pThis->cRefs);
1205	AssertMsg(cRefs < _1G, ("%#x %p\n", cRefs, pThis));
1206	if (cRefs == 0)
1207	rtAioMgrDestroy(pThis);
1208	return cRefs;
1209	}
1210
1211	RTDECL(int) RTAioMgrFileCreate(RTAIOMGR hAioMgr, RTFILE hFile, PFNRTAIOMGRREQCOMPLETE pfnReqComplete,
1212	void *pvUser, PRTAIOMGRFILE phAioMgrFile)
1213	{
1214	int rc = VINF_SUCCESS;
1215	PRTAIOMGRFILEINT pThis;
1216
1217	AssertReturn(hAioMgr != NIL_RTAIOMGR, VERR_INVALID_HANDLE);
1218	AssertReturn(hFile != NIL_RTFILE, VERR_INVALID_HANDLE);
1219	AssertPtrReturn(pfnReqComplete, VERR_INVALID_POINTER);
1220	AssertPtrReturn(phAioMgrFile, VERR_INVALID_POINTER);
1221
1222	pThis = (PRTAIOMGRFILEINT)RTMemAllocZ(sizeof(RTAIOMGRFILEINT));
1223	if (pThis)
1224	{
1225	pThis->u32Magic = RTAIOMGRFILE_MAGIC;
1226	pThis->cRefs = 1;
1227	pThis->hFile = hFile;
1228	pThis->pAioMgr = hAioMgr;
1229	pThis->pvUser = pvUser;
1230	pThis->pfnReqCompleted = pfnReqComplete;
1231	RTQueueAtomicInit(&pThis->QueueReqs);
1232	RTListInit(&pThis->AioMgr.ListWaitingReqs);
1233	RTAioMgrRetain(hAioMgr);
1234	rc = RTFileAioCtxAssociateWithFile(pThis->pAioMgr->hAioCtx, hFile);
1235	if (RT_FAILURE(rc))
1236	rtAioMgrFileDestroy(pThis);
1237	else
1238	rtAioMgrAddFile(pThis->pAioMgr, pThis);
1239	}
1240	else
1241	rc = VERR_NO_MEMORY;
1242
1243	if (RT_SUCCESS(rc))
1244	*phAioMgrFile = pThis;
1245
1246	return rc;
1247	}
1248
1249	RTDECL(uint32_t) RTAioMgrFileRetain(RTAIOMGRFILE hAioMgrFile)
1250	{
1251	PRTAIOMGRFILEINT pThis = hAioMgrFile;
1252	AssertReturn(hAioMgrFile != NIL_RTAIOMGRFILE, UINT32_MAX);
1253	AssertPtrReturn(pThis, UINT32_MAX);
1254	AssertReturn(pThis->u32Magic == RTAIOMGRFILE_MAGIC, UINT32_MAX);
1255
1256	uint32_t cRefs = ASMAtomicIncU32(&pThis->cRefs);
1257	AssertMsg(cRefs > 1 && cRefs < _1G, ("%#x %p\n", cRefs, pThis));
1258	return cRefs;
1259	}
1260
1261	RTDECL(uint32_t) RTAioMgrFileRelease(RTAIOMGRFILE hAioMgrFile)
1262	{
1263	PRTAIOMGRFILEINT pThis = hAioMgrFile;
1264	if (pThis == NIL_RTAIOMGRFILE)
1265	return 0;
1266	AssertPtrReturn(pThis, UINT32_MAX);
1267	AssertReturn(pThis->u32Magic == RTAIOMGRFILE_MAGIC, UINT32_MAX);
1268
1269	uint32_t cRefs = ASMAtomicDecU32(&pThis->cRefs);
1270	AssertMsg(cRefs < _1G, ("%#x %p\n", cRefs, pThis));
1271	if (cRefs == 0)
1272	rtAioMgrFileDestroy(pThis);
1273	return cRefs;
1274	}
1275
1276	RTDECL(void *) RTAioMgrFileGetUser(RTAIOMGRFILE hAioMgrFile)
1277	{
1278	PRTAIOMGRFILEINT pThis = hAioMgrFile;
1279
1280	AssertPtrReturn(pThis, NULL);
1281	return pThis->pvUser;
1282	}
1283
1284	RTDECL(int) RTAioMgrFileRead(RTAIOMGRFILE hAioMgrFile, RTFOFF off,
1285	PRTSGBUF pSgBuf, size_t cbRead, void *pvUser)
1286	{
1287	return rtAioMgrFileIoReqCreate(hAioMgrFile, off, pSgBuf, cbRead, pvUser,
1288	RTAIOMGRREQTYPE_READ);
1289	}
1290
1291	RTDECL(int) RTAioMgrFileWrite(RTAIOMGRFILE hAioMgrFile, RTFOFF off,
1292	PRTSGBUF pSgBuf, size_t cbWrite, void *pvUser)
1293	{
1294	return rtAioMgrFileIoReqCreate(hAioMgrFile, off, pSgBuf, cbWrite, pvUser,
1295	RTAIOMGRREQTYPE_WRITE);
1296	}
1297
1298	RTDECL(int) RTAioMgrFileFlush(RTAIOMGRFILE hAioMgrFile, void *pvUser)
1299	{
1300	PRTAIOMGRFILEINT pFile = hAioMgrFile;
1301	PRTAIOMGRINT pAioMgr;
1302
1303	AssertPtrReturn(pFile, VERR_INVALID_HANDLE);
1304
1305	pAioMgr = pFile->pAioMgr;
1306
1307	PRTAIOMGRREQ pReq = rtAioMgrReqAlloc(pAioMgr);
1308	if (RT_UNLIKELY(!pReq))
1309	return VERR_NO_MEMORY;
1310
1311	pReq->pFile = pFile;
1312	pReq->enmType = RTAIOMGRREQTYPE_FLUSH;
1313	pReq->pvUser = pvUser;
1314	rtAioMgrFileQueueReq(pFile, pReq);
1315
1316	return VERR_FILE_AIO_IN_PROGRESS;
1317	}
1318

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source: vbox/trunk/src/VBox/Runtime/common/misc/aiomgr.cpp@ 57358

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