ioqueue-stdfile-provider.cpp@ 99739

Last change on this file since 99739 was 99739, checked in by vboxsync, 19 months ago
*: doxygen corrections (mostly about removing @returns from functions returning void).
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1	/* $Id: ioqueue-stdfile-provider.cpp 99739 2023-05-11 01:01:08Z vboxsync $ */
2	/** @file
3	* IPRT - I/O queue, Standard file provider.
4	*/
5
6	/*
7	* Copyright (C) 2019-2023 Oracle and/or its affiliates.
8	*
9	* This file is part of VirtualBox base platform packages, as
10	* available from https://www.virtualbox.org.
11	*
12	* This program is free software; you can redistribute it and/or
13	* modify it under the terms of the GNU General Public License
14	* as published by the Free Software Foundation, in version 3 of the
15	* License.
16	*
17	* This program is distributed in the hope that it will be useful, but
18	* WITHOUT ANY WARRANTY; without even the implied warranty of
19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20	* General Public License for more details.
21	*
22	* You should have received a copy of the GNU General Public License
23	* along with this program; if not, see <https://www.gnu.org/licenses>.
24	*
25	* The contents of this file may alternatively be used under the terms
26	* of the Common Development and Distribution License Version 1.0
27	* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
28	* in the VirtualBox distribution, in which case the provisions of the
29	* CDDL are applicable instead of those of the GPL.
30	*
31	* You may elect to license modified versions of this file under the
32	* terms and conditions of either the GPL or the CDDL or both.
33	*
34	* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
35	*/
36
37
38	/*********************************************************************************************************************************
39	* Header Files *
40	*********************************************************************************************************************************/
41	#define LOG_GROUP RTLOGGROUP_IOQUEUE
42	#include <iprt/ioqueue.h>
43
44	#include <iprt/asm.h>
45	#include <iprt/errcore.h>
46	#include <iprt/file.h>
47	#include <iprt/log.h>
48	#include <iprt/mem.h>
49	#include <iprt/semaphore.h>
50	#include <iprt/string.h>
51	#include <iprt/thread.h>
52
53	#include "internal/ioqueue.h"
54
55
56	/*********************************************************************************************************************************
57	* Defined Constants And Macros *
58	*********************************************************************************************************************************/
59
60	/** The I/O queue worker thread needs to wake up the waiting thread when requests completed. */
61	#define RTIOQUEUE_STDFILE_PROV_STATE_F_EVTWAIT_NEED_WAKEUP RT_BIT(0)
62	/** The waiting thread was interrupted by the external wakeup call. */
63	#define RTIOQUEUE_STDFILE_PROV_STATE_F_EVTWAIT_INTR RT_BIT(1)
64	#define RTIOQUEUE_STDFILE_PROV_STATE_F_EVTWAIT_INTR_BIT 1
65	/** The I/O queue worker thread needs to be woken up to process new requests. */
66	#define RTIOQUEUE_STDFILE_PROV_STATE_F_WORKER_NEED_WAKEUP RT_BIT(2)
67	#define RTIOQUEUE_STDFILE_PROV_STATE_F_WORKER_NEED_WAKEUP_BIT 2
68
69
70	/*********************************************************************************************************************************
71	* Structures and Typedefs *
72	*********************************************************************************************************************************/
73
74
75	/**
76	* Submission queue entry.
77	*/
78	typedef struct RTIOQUEUESSQENTRY
79	{
80	/** The file to work on. */
81	RTFILE hFile;
82	/** I/O operation. */
83	RTIOQUEUEOP enmOp;
84	/** Start offset. */
85	uint64_t off;
86	/** Additional request flags. */
87	uint32_t fReqFlags;
88	/** Size of the request. */
89	size_t cbReq;
90	/** Opaque user data passed on completion. */
91	void *pvUser;
92	/** Flag whether this is a S/G or standard request. */
93	bool fSg;
94	/** Type dependent data. */
95	union
96	{
97	/** Pointer to buffer for non S/G requests. */
98	void *pvBuf;
99	/** Pointer to S/G buffer. */
100	PCRTSGBUF pSgBuf;
101	} u;
102	} RTIOQUEUESSQENTRY;
103	/** Pointer to a submission queue entry. */
104	typedef RTIOQUEUESSQENTRY *PRTIOQUEUESSQENTRY;
105	/** Pointer to a constant submission queue entry. */
106	typedef const RTIOQUEUESSQENTRY *PCRTIOQUEUESSQENTRY;
107
108
109	/**
110	* Internal I/O queue provider instance data.
111	*/
112	typedef struct RTIOQUEUEPROVINT
113	{
114	/** Size of the submission queue in entries. */
115	uint32_t cSqEntries;
116	/** Size of the completion queue in entries. */
117	uint32_t cCqEntries;
118	/** Pointer to the submission queue base. */
119	PRTIOQUEUESSQENTRY paSqEntryBase;
120	/** Submission queue producer index. */
121	volatile uint32_t idxSqProd;
122	/** Submission queue producer value for any uncommitted requests. */
123	uint32_t idxSqProdUncommit;
124	/** Submission queue consumer index. */
125	volatile uint32_t idxSqCons;
126	/** Pointer to the completion queue base. */
127	PRTIOQUEUECEVT paCqEntryBase;
128	/** Completion queue producer index. */
129	volatile uint32_t idxCqProd;
130	/** Completion queue consumer index. */
131	volatile uint32_t idxCqCons;
132	/** Various state flags for synchronizing the worker thread with other participants. */
133	volatile uint32_t fState;
134	/** The worker thread handle. */
135	RTTHREAD hThrdWork;
136	/** Event semaphore the worker thread waits on for work. */
137	RTSEMEVENT hSemEvtWorker;
138	/** Event semaphore the caller waits for completion events. */
139	RTSEMEVENT hSemEvtWaitEvts;
140	/** Flag whether to shutdown the worker thread. */
141	volatile bool fShutdown;
142	} RTIOQUEUEPROVINT;
143	/** Pointer to the internal I/O queue provider instance data. */
144	typedef RTIOQUEUEPROVINT *PRTIOQUEUEPROVINT;
145
146
147	/*********************************************************************************************************************************
148	* Internal Functions *
149	*********************************************************************************************************************************/
150
151
152	/**
153	* Processes the given submission queue entry and reports back the result in the completion queue.
154	*
155	* @param pSqEntry The submission queue entry to process.
156	* @param pCqEntry The comppletion queue entry to store the result in.
157	*/
158	static void rtIoQueueStdFileProv_SqEntryProcess(PCRTIOQUEUESSQENTRY pSqEntry, PRTIOQUEUECEVT pCqEntry)
159	{
160	int rcReq = VINF_SUCCESS;
161
162	switch (pSqEntry->enmOp)
163	{
164	case RTIOQUEUEOP_READ:
165	if (!pSqEntry->fSg)
166	rcReq = RTFileReadAt(pSqEntry->hFile, pSqEntry->off, pSqEntry->u.pvBuf, pSqEntry->cbReq, NULL);
167	else
168	{
169	RTSGBUF SgBuf;
170	RTSgBufClone(&SgBuf, pSqEntry->u.pSgBuf);
171	rcReq = RTFileSgReadAt(pSqEntry->hFile, pSqEntry->off, &SgBuf, pSqEntry->cbReq, NULL);
172	}
173	break;
174	case RTIOQUEUEOP_WRITE:
175	if (!pSqEntry->fSg)
176	rcReq = RTFileWriteAt(pSqEntry->hFile, pSqEntry->off, pSqEntry->u.pvBuf, pSqEntry->cbReq, NULL);
177	else
178	{
179	RTSGBUF SgBuf;
180	RTSgBufClone(&SgBuf, pSqEntry->u.pSgBuf);
181	rcReq = RTFileSgWriteAt(pSqEntry->hFile, pSqEntry->off, &SgBuf, pSqEntry->cbReq, NULL);
182	}
183	break;
184	case RTIOQUEUEOP_SYNC:
185	rcReq = RTFileFlush(pSqEntry->hFile);
186	break;
187	default:
188	AssertMsgFailedReturnVoid(("Invalid I/O queue operation: %d\n", pSqEntry->enmOp));
189	}
190
191	/* Write the result back into the completion queue. */
192	pCqEntry->rcReq = rcReq;
193	pCqEntry->pvUser = pSqEntry->pvUser;
194	pCqEntry->cbXfered = RT_SUCCESS(rcReq) ? pSqEntry->cbReq : 0;
195	}
196
197
198	/**
199	* The main I/O queue worker loop which processes the incoming I/O requests.
200	*/
201	static DECLCALLBACK(int) rtIoQueueStdFileProv_WorkerLoop(RTTHREAD hThrdSelf, void *pvUser)
202	{
203	PRTIOQUEUEPROVINT pThis = (PRTIOQUEUEPROVINT)pvUser;
204
205	/* Signal that we started up. */
206	int rc = RTThreadUserSignal(hThrdSelf);
207	AssertRC(rc);
208
209	while (!ASMAtomicReadBool(&pThis->fShutdown))
210	{
211	/* Wait for some work. */
212	ASMAtomicOrU32(&pThis->fState, RTIOQUEUE_STDFILE_PROV_STATE_F_WORKER_NEED_WAKEUP);
213	uint32_t idxSqProd = ASMAtomicReadU32(&pThis->idxSqProd);
214	uint32_t idxSqCons = ASMAtomicReadU32(&pThis->idxSqCons);
215	uint32_t idxCqCons = ASMAtomicReadU32(&pThis->idxCqCons);
216
217	if (idxSqCons == idxSqProd)
218	{
219	rc = RTSemEventWait(pThis->hSemEvtWorker, RT_INDEFINITE_WAIT);
220	AssertRC(rc);
221
222	idxSqProd = ASMAtomicReadU32(&pThis->idxSqProd);
223	idxSqCons = ASMAtomicReadU32(&pThis->idxSqCons);
224	idxCqCons = ASMAtomicReadU32(&pThis->idxCqCons);
225	}
226
227	ASMAtomicBitTestAndClear(&pThis->fState, RTIOQUEUE_STDFILE_PROV_STATE_F_WORKER_NEED_WAKEUP_BIT);
228
229	/* Process all requests. */
230	uint32_t cCqFree = 0;
231	if (idxCqCons > pThis->idxCqProd)
232	cCqFree = pThis->cCqEntries - (pThis->cCqEntries - idxCqCons) - pThis->idxCqProd;
233	else
234	cCqFree = pThis->cCqEntries - pThis->idxCqProd - idxCqCons;
235	do
236	{
237	while ( idxSqCons != idxSqProd
238	&& cCqFree)
239	{
240	PCRTIOQUEUESSQENTRY pSqEntry = &pThis->paSqEntryBase[idxSqCons];
241	PRTIOQUEUECEVT pCqEntry = &pThis->paCqEntryBase[pThis->idxCqProd];
242
243	rtIoQueueStdFileProv_SqEntryProcess(pSqEntry, pCqEntry);
244	ASMWriteFence();
245
246	idxSqCons = (idxSqCons + 1) % pThis->cSqEntries;
247	cCqFree--;
248	pThis->idxCqProd = (pThis->idxCqProd + 1) % pThis->cCqEntries;
249	ASMAtomicWriteU32(&pThis->idxSqCons, idxSqCons);
250	ASMWriteFence();
251	if (ASMAtomicReadU32(&pThis->fState) & RTIOQUEUE_STDFILE_PROV_STATE_F_EVTWAIT_NEED_WAKEUP)
252	{
253	rc = RTSemEventSignal(pThis->hSemEvtWaitEvts);
254	AssertRC(rc);
255	}
256	}
257
258	idxSqProd = ASMAtomicReadU32(&pThis->idxSqProd);
259	} while ( idxSqCons != idxSqProd
260	&& cCqFree);
261	}
262
263	return VINF_SUCCESS;
264	}
265
266
267	/** @interface_method_impl{RTIOQUEUEPROVVTABLE,pfnIsSupported} */
268	static DECLCALLBACK(bool) rtIoQueueStdFileProv_IsSupported(void)
269	{
270	/* The common code/public API already checked for the proper handle type. */
271	return true;
272	}
273
274
275	/** @interface_method_impl{RTIOQUEUEPROVVTABLE,pfnQueueInit} */
276	static DECLCALLBACK(int) rtIoQueueStdFileProv_QueueInit(RTIOQUEUEPROV hIoQueueProv, uint32_t fFlags,
277	uint32_t cSqEntries, uint32_t cCqEntries)
278	{
279	RT_NOREF(fFlags);
280
281	PRTIOQUEUEPROVINT pThis = hIoQueueProv;
282	int rc = VINF_SUCCESS;
283
284	cSqEntries++;
285	cCqEntries++;
286
287	pThis->cSqEntries = cSqEntries;
288	pThis->cCqEntries = cCqEntries;
289	pThis->idxSqProd = 0;
290	pThis->idxSqProdUncommit = 0;
291	pThis->idxSqCons = 0;
292	pThis->idxCqProd = 0;
293	pThis->idxCqCons = 0;
294	pThis->fShutdown = false;
295	pThis->fState = 0;
296
297	pThis->paSqEntryBase = (PRTIOQUEUESSQENTRY)RTMemAllocZ(cSqEntries * sizeof(RTIOQUEUESSQENTRY));
298	if (RT_LIKELY(pThis->paSqEntryBase))
299	{
300	pThis->paCqEntryBase = (PRTIOQUEUECEVT)RTMemAllocZ(cCqEntries * sizeof(RTIOQUEUECEVT));
301	if (RT_LIKELY(pThis->paSqEntryBase))
302	{
303	rc = RTSemEventCreate(&pThis->hSemEvtWorker);
304	if (RT_SUCCESS(rc))
305	{
306	rc = RTSemEventCreate(&pThis->hSemEvtWaitEvts);
307	if (RT_SUCCESS(rc))
308	{
309	/* Spin up the worker thread. */
310	rc = RTThreadCreate(&pThis->hThrdWork, rtIoQueueStdFileProv_WorkerLoop, pThis, 0, RTTHREADTYPE_IO, RTTHREADFLAGS_WAITABLE,
311	"IoQ-StdFile");
312	if (RT_SUCCESS(rc))
313	{
314	rc = RTThreadUserWait(pThis->hThrdWork, 10 * RT_MS_1SEC);
315	AssertRC(rc);
316
317	return VINF_SUCCESS;
318	}
319
320	RTSemEventDestroy(pThis->hSemEvtWaitEvts);
321	}
322
323	RTSemEventDestroy(pThis->hSemEvtWorker);
324	}
325
326	RTMemFree(pThis->paCqEntryBase);
327	}
328	else
329	rc = VERR_NO_MEMORY;
330
331	RTMemFree(pThis->paSqEntryBase);
332	}
333	else
334	rc = VERR_NO_MEMORY;
335
336	return rc;
337	}
338
339
340	/** @interface_method_impl{RTIOQUEUEPROVVTABLE,pfnQueueDestroy} */
341	static DECLCALLBACK(void) rtIoQueueStdFileProv_QueueDestroy(RTIOQUEUEPROV hIoQueueProv)
342	{
343	PRTIOQUEUEPROVINT pThis = hIoQueueProv;
344
345	ASMAtomicXchgBool(&pThis->fShutdown, true);
346	RTSemEventSignal(pThis->hSemEvtWorker);
347
348	int rc = RTThreadWait(pThis->hThrdWork, 60 * RT_MS_1SEC, NULL);
349	AssertRC(rc);
350
351	RTSemEventDestroy(pThis->hSemEvtWaitEvts);
352	RTSemEventDestroy(pThis->hSemEvtWorker);
353	RTMemFree(pThis->paCqEntryBase);
354	RTMemFree(pThis->paSqEntryBase);
355	RT_BZERO(pThis, sizeof(*pThis));
356	}
357
358
359	/** @interface_method_impl{RTIOQUEUEPROVVTABLE,pfnHandleRegister} */
360	static DECLCALLBACK(int) rtIoQueueStdFileProv_HandleRegister(RTIOQUEUEPROV hIoQueueProv, PCRTHANDLE pHandle)
361	{
362	RT_NOREF(hIoQueueProv, pHandle);
363
364	/* Nothing to do here. */
365	return VINF_SUCCESS;
366	}
367
368
369	/** @interface_method_impl{RTIOQUEUEPROVVTABLE,pfnHandleDeregister} */
370	static DECLCALLBACK(int) rtIoQueueStdFileProv_HandleDeregister(RTIOQUEUEPROV hIoQueueProv, PCRTHANDLE pHandle)
371	{
372	RT_NOREF(hIoQueueProv, pHandle);
373
374	/* Nothing to do here. */
375	return VINF_SUCCESS;
376	}
377
378
379	/** @interface_method_impl{RTIOQUEUEPROVVTABLE,pfnReqPrepare} */
380	static DECLCALLBACK(int) rtIoQueueStdFileProv_ReqPrepare(RTIOQUEUEPROV hIoQueueProv, PCRTHANDLE pHandle, RTIOQUEUEOP enmOp,
381	uint64_t off, void *pvBuf, size_t cbBuf, uint32_t fReqFlags,
382	void *pvUser)
383	{
384	PRTIOQUEUEPROVINT pThis = hIoQueueProv;
385	PRTIOQUEUESSQENTRY pSqEntry = &pThis->paSqEntryBase[pThis->idxSqProdUncommit];
386
387	pSqEntry->hFile = pHandle->u.hFile;
388	pSqEntry->enmOp = enmOp;
389	pSqEntry->off = off;
390	pSqEntry->fReqFlags = fReqFlags;
391	pSqEntry->cbReq = cbBuf;
392	pSqEntry->pvUser = pvUser;
393	pSqEntry->fSg = false;
394	pSqEntry->u.pvBuf = pvBuf;
395
396	pThis->idxSqProdUncommit = (pThis->idxSqProdUncommit + 1) % pThis->cSqEntries;
397	return VINF_SUCCESS;
398	}
399
400
401	/** @interface_method_impl{RTIOQUEUEPROVVTABLE,pfnReqPrepareSg} */
402	static DECLCALLBACK(int) rtIoQueueStdFileProv_ReqPrepareSg(RTIOQUEUEPROV hIoQueueProv, PCRTHANDLE pHandle, RTIOQUEUEOP enmOp,
403	uint64_t off, PCRTSGBUF pSgBuf, size_t cbSg, uint32_t fReqFlags,
404	void *pvUser)
405	{
406	PRTIOQUEUEPROVINT pThis = hIoQueueProv;
407	PRTIOQUEUESSQENTRY pSqEntry = &pThis->paSqEntryBase[pThis->idxSqProdUncommit];
408
409	pSqEntry->hFile = pHandle->u.hFile;
410	pSqEntry->enmOp = enmOp;
411	pSqEntry->off = off;
412	pSqEntry->fReqFlags = fReqFlags;
413	pSqEntry->cbReq = cbSg;
414	pSqEntry->pvUser = pvUser;
415	pSqEntry->fSg = true;
416	pSqEntry->u.pSgBuf = pSgBuf;
417
418	pThis->idxSqProdUncommit = (pThis->idxSqProdUncommit + 1) % pThis->cSqEntries;
419	return VINF_SUCCESS;
420	}
421
422
423	/** @interface_method_impl{RTIOQUEUEPROVVTABLE,pfnCommit} */
424	static DECLCALLBACK(int) rtIoQueueStdFileProv_Commit(RTIOQUEUEPROV hIoQueueProv, uint32_t *pcReqsCommitted)
425	{
426	PRTIOQUEUEPROVINT pThis = hIoQueueProv;
427
428	if (pThis->idxSqProd > pThis->idxSqProdUncommit)
429	*pcReqsCommitted = pThis->cSqEntries - pThis->idxSqProd + pThis->idxSqProdUncommit;
430	else
431	*pcReqsCommitted = pThis->idxSqProdUncommit - pThis->idxSqProd;
432
433	ASMWriteFence();
434	ASMAtomicWriteU32(&pThis->idxSqProd, pThis->idxSqProdUncommit);
435	return RTSemEventSignal(pThis->hSemEvtWorker);
436	}
437
438
439	/** @interface_method_impl{RTIOQUEUEPROVVTABLE,pfnEvtWait} */
440	static DECLCALLBACK(int) rtIoQueueStdFileProv_EvtWait(RTIOQUEUEPROV hIoQueueProv, PRTIOQUEUECEVT paCEvt, uint32_t cCEvt,
441	uint32_t cMinWait, uint32_t *pcCEvt, uint32_t fFlags)
442	{
443	RT_NOREF(fFlags);
444
445	PRTIOQUEUEPROVINT pThis = hIoQueueProv;
446	int rc = VINF_SUCCESS;
447	uint32_t idxCEvt = 0;
448
449	while ( RT_SUCCESS(rc)
450	&& cMinWait
451	&& cCEvt)
452	{
453	ASMAtomicOrU32(&pThis->fState, RTIOQUEUE_STDFILE_PROV_STATE_F_EVTWAIT_NEED_WAKEUP);
454	uint32_t idxCqProd = ASMAtomicReadU32(&pThis->idxCqProd);
455	uint32_t idxCqCons = ASMAtomicReadU32(&pThis->idxCqCons);
456
457	if (idxCqCons == idxCqProd)
458	{
459	rc = RTSemEventWait(pThis->hSemEvtWaitEvts, RT_INDEFINITE_WAIT);
460	AssertRC(rc);
461	if (ASMAtomicBitTestAndClear(&pThis->fState, RTIOQUEUE_STDFILE_PROV_STATE_F_EVTWAIT_INTR_BIT))
462	{
463	rc = VERR_INTERRUPTED;
464	ASMAtomicBitTestAndClear(&pThis->fState, RTIOQUEUE_STDFILE_PROV_STATE_F_WORKER_NEED_WAKEUP_BIT);
465	break;
466	}
467
468	idxCqProd = ASMAtomicReadU32(&pThis->idxCqProd);
469	idxCqCons = ASMAtomicReadU32(&pThis->idxCqCons);
470	}
471
472	ASMAtomicBitTestAndClear(&pThis->fState, RTIOQUEUE_STDFILE_PROV_STATE_F_WORKER_NEED_WAKEUP_BIT);
473
474	/* Process all requests. */
475	while ( idxCqCons != idxCqProd
476	&& cCEvt)
477	{
478	PRTIOQUEUECEVT pCqEntry = &pThis->paCqEntryBase[idxCqCons];
479
480	paCEvt[idxCEvt].rcReq = pCqEntry->rcReq;
481	paCEvt[idxCEvt].pvUser = pCqEntry->pvUser;
482	paCEvt[idxCEvt].cbXfered = pCqEntry->cbXfered;
483	ASMReadFence();
484
485	idxCEvt++;
486	cCEvt--;
487	cMinWait--;
488
489	idxCqCons = (idxCqCons + 1) % pThis->cCqEntries;
490	pThis->idxCqCons = (pThis->idxCqCons + 1) % pThis->cCqEntries;
491	ASMWriteFence();
492	}
493	}
494
495	*pcCEvt = idxCEvt;
496	return rc;
497	}
498
499
500	/** @interface_method_impl{RTIOQUEUEPROVVTABLE,pfnEvtWaitWakeup} */
501	static DECLCALLBACK(int) rtIoQueueStdFileProv_EvtWaitWakeup(RTIOQUEUEPROV hIoQueueProv)
502	{
503	PRTIOQUEUEPROVINT pThis = hIoQueueProv;
504
505	ASMAtomicOrU32(&pThis->fState, RTIOQUEUE_STDFILE_PROV_STATE_F_EVTWAIT_INTR);
506	return RTSemEventSignal(pThis->hSemEvtWaitEvts);
507	}
508
509
510	/**
511	* Standard file I/O queue provider virtual method table.
512	*/
513	RT_DECL_DATA_CONST(RTIOQUEUEPROVVTABLE const) g_RTIoQueueStdFileProv =
514	{
515	/** uVersion */
516	RTIOQUEUEPROVVTABLE_VERSION,
517	/** pszId */
518	"StdFile",
519	/** cbIoQueueProv */
520	sizeof(RTIOQUEUEPROVINT),
521	/** enmHnd */
522	RTHANDLETYPE_FILE,
523	/** fFlags */
524	0,
525	/** pfnIsSupported */
526	rtIoQueueStdFileProv_IsSupported,
527	/** pfnQueueInit */
528	rtIoQueueStdFileProv_QueueInit,
529	/** pfnQueueDestroy */
530	rtIoQueueStdFileProv_QueueDestroy,
531	/** pfnHandleRegister */
532	rtIoQueueStdFileProv_HandleRegister,
533	/** pfnHandleDeregister */
534	rtIoQueueStdFileProv_HandleDeregister,
535	/** pfnReqPrepare */
536	rtIoQueueStdFileProv_ReqPrepare,
537	/** pfnReqPrepareSg */
538	rtIoQueueStdFileProv_ReqPrepareSg,
539	/** pfnCommit */
540	rtIoQueueStdFileProv_Commit,
541	/** pfnEvtWait */
542	rtIoQueueStdFileProv_EvtWait,
543	/** pfnEvtWaitWakeup */
544	rtIoQueueStdFileProv_EvtWaitWakeup,
545	/** uEndMarker */
546	RTIOQUEUEPROVVTABLE_VERSION
547	};
548

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source: vbox/trunk/src/VBox/Runtime/common/ioqueue/ioqueue-stdfile-provider.cpp@ 99739

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