PDMR3Task.cpp@ 106842

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1	/* $Id: PDMR3Task.cpp 106061 2024-09-16 14:03:52Z vboxsync $ */
2	/** @file
3	* PDM Task - Asynchronous user mode tasks.
4	*/
5
6	/*
7	* Copyright (C) 2019-2024 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	* SPDX-License-Identifier: GPL-3.0-only
26	*/
27
28
29	/*********************************************************************************************************************************
30	* Header Files *
31	*********************************************************************************************************************************/
32	#define LOG_GROUP LOG_GROUP_PDM_TASK
33	#include "PDMInternal.h"
34	#include <VBox/vmm/pdmtask.h>
35	#include <VBox/vmm/mm.h>
36	#include <VBox/vmm/vm.h>
37	#include <VBox/err.h>
38
39	#include <VBox/log.h>
40	#include <VBox/sup.h>
41	#include <iprt/asm.h>
42	#include <iprt/assert.h>
43	#include <iprt/semaphore.h>
44	#include <iprt/thread.h>
45
46
47	/**
48	* @callback_method_impl{FNDBGFINFOARGVINT}
49	*/
50	static DECLCALLBACK(void) pdmR3TaskInfo(PVM pVM, PCDBGFINFOHLP pHlp, int cArgs, char **papszArgs)
51	{
52	RT_NOREF(cArgs, papszArgs); /* for now. */
53
54	uint32_t cSetsDisplayed = 0;
55	for (size_t i = 0; i < RT_ELEMENTS(pVM->pdm.s.apTaskSets); i++)
56	{
57	PPDMTASKSET pTaskSet = pVM->pdm.s.apTaskSets[i];
58	if ( pTaskSet
59	&& ( pTaskSet->cAllocated > 0
60	\|\| ASMAtomicReadU64(&pTaskSet->fTriggered)))
61	{
62	if (cSetsDisplayed > 0)
63	pHlp->pfnPrintf(pHlp, "\n");
64	pHlp->pfnPrintf(pHlp,
65	"Task set #%u - handle base %u, pending %#RX64%s%s, running %d, %u of %u allocated:\n"
66	/* 123: triggered internal 0123456789abcdef 0123456789abcdef 0x0000 SomeFunctionName */
67	" Hnd: State Type pfnCallback pvUser Flags Name\n",
68	i, pTaskSet->uHandleBase, ASMAtomicReadU64(&pTaskSet->fTriggered),
69	pTaskSet->fRZEnabled ? " RZ-enabled" : "", pTaskSet->hThread != NIL_RTTHREAD ? "" : " no-thread",
70	(int)ASMAtomicReadU32(&pTaskSet->idxRunning), pTaskSet->cAllocated, RT_ELEMENTS(pTaskSet->aTasks));
71	for (unsigned j = 0; j < RT_ELEMENTS(pTaskSet->aTasks); j++)
72	{
73	PPDMTASK pTask = &pTaskSet->aTasks[j];
74	if (pTask->pvOwner)
75	{
76	const char *pszType;
77	switch (pTask->enmType)
78	{
79	case PDMTASKTYPE_DEV: pszType = " device "; break;
80	case PDMTASKTYPE_DRV: pszType = " driver "; break;
81	case PDMTASKTYPE_USB: pszType = " usbdev "; break;
82	case PDMTASKTYPE_INTERNAL: pszType = "internal"; break;
83	default: pszType = "unknown "; break;
84	}
85	pHlp->pfnPrintf(pHlp, " %3u: %s %s %p %p %#06x %s\n", pTaskSet->uHandleBase + j,
86	ASMBitTest(&pTaskSet->fTriggered, j) ? "triggered"
87	: ASMAtomicReadU32(&pTaskSet->idxRunning) == j ? " running " : " idle ",
88	pszType, pTask->pfnCallback, pTask->pvUser, pTask->fFlags, pTask->pszName);
89	}
90	}
91
92	cSetsDisplayed++;
93	}
94	}
95	}
96
97
98	/**
99	* Initializes the ring-0 capable tasks during VM construction.
100	*
101	* @returns VBox status code.
102	* @param pVM The cross context VM structure.
103	*/
104	int pdmR3TaskInit(PVM pVM)
105	{
106	for (size_t i = 0; i < RT_ELEMENTS(pVM->pdm.s.aTaskSets); i++)
107	{
108	PPDMTASKSET pTaskSet = &pVM->pdm.s.aTaskSets[i];
109
110	pTaskSet->u32Magic = PDMTASKSET_MAGIC;
111	pTaskSet->fRZEnabled = true;
112	//pTaskSet->cAllocated = 0;
113	pTaskSet->uHandleBase = (uint16_t)(i * RT_ELEMENTS(pTaskSet->aTasks));
114	pTaskSet->hThread = NIL_RTTHREAD;
115	int rc = SUPSemEventCreate(pVM->pSession, &pTaskSet->hEventR0);
116	AssertRCReturn(rc, rc);
117	pTaskSet->hEventR3 = NIL_RTSEMEVENT;
118	//pTaskSet->fTriggered = 0;
119	pTaskSet->idxRunning = UINT8_MAX;
120	//pTaskSet->fShutdown = false;
121	pTaskSet->pVM = pVM;
122
123	pVM->pdm.s.apTaskSets[i] = pTaskSet;
124	}
125
126	int rc = DBGFR3InfoRegisterInternalArgv(pVM, "tasks", "PDM tasks", pdmR3TaskInfo, 0 /fFlags/);
127	AssertRC(rc);
128
129	return VINF_SUCCESS;
130	}
131
132
133	/**
134	* Terminates task threads when the VM is destroyed.
135	*
136	* @param pVM The cross context VM structure.
137	*/
138	void pdmR3TaskTerm(PVM pVM)
139	{
140	/*
141	* Signal all the threads first.
142	*/
143	for (size_t i = 0; i < RT_ELEMENTS(pVM->pdm.s.apTaskSets); i++)
144	{
145	PPDMTASKSET pTaskSet = pVM->pdm.s.apTaskSets[i];
146	if (pTaskSet)
147	{
148	/*
149	* Set the shutdown indicator and signal the thread.
150	*/
151	ASMAtomicWriteBool(&pTaskSet->fShutdown, true);
152
153	if (pTaskSet->hEventR0 != NIL_SUPSEMEVENT)
154	{
155	int rc = SUPSemEventSignal(pVM->pSession, pTaskSet->hEventR0);
156	AssertRC(rc);
157	}
158
159	if (pTaskSet->hEventR3 != NIL_RTSEMEVENT)
160	{
161	int rc = RTSemEventSignal(pTaskSet->hEventR3);
162	AssertRC(rc);
163	}
164	}
165	}
166
167	/*
168	* Wait for them to terminate and clean up semaphores.
169	*/
170	for (size_t i = 0; i < RT_ELEMENTS(pVM->pdm.s.apTaskSets); i++)
171	{
172	PPDMTASKSET pTaskSet = pVM->pdm.s.apTaskSets[i];
173	if (pTaskSet)
174	{
175	/*
176	* Wait for the thread to terminate.
177	*/
178	if (pTaskSet->hThread != NIL_RTTHREAD)
179	{
180	int rc = RTThreadWait(pTaskSet->hThread, RT_MS_30SEC, NULL);
181	AssertLogRelMsg(RT_SUCCESS(rc), ("pTaskSet %u: thread wait failed: %Rrc\n", i, rc));
182	if (RT_SUCCESS(rc))
183	pTaskSet->hThread = NIL_RTTHREAD;
184	}
185
186	/*
187	* Destroy the semaphore.
188	*/
189	if (pTaskSet->hEventR0 != NIL_SUPSEMEVENT)
190	{
191	int rc = SUPSemEventClose(pVM->pSession, pTaskSet->hEventR0);
192	AssertRC(rc);
193	pTaskSet->hEventR0 = NIL_SUPSEMEVENT;
194	}
195
196	if (pTaskSet->hEventR3 != NIL_RTSEMEVENT)
197	{
198	int rc = RTSemEventDestroy(pTaskSet->hEventR3);
199	AssertRC(rc);
200	pTaskSet->hEventR3 = NIL_RTSEMEVENT;
201	}
202	}
203	}
204	}
205
206
207	/**
208	* @callback_method_impl{FNRTTHREAD,
209	* PDM Asynchronous Task Executor Thread}
210	*/
211	static DECLCALLBACK(int) pdmR3TaskThread(RTTHREAD ThreadSelf, void *pvUser)
212	{
213	PPDMTASKSET const pTaskSet = (PPDMTASKSET)pvUser;
214	AssertPtr(pTaskSet);
215	Assert(pTaskSet->u32Magic == PDMTASKSET_MAGIC);
216	RT_NOREF(ThreadSelf);
217
218	/*
219	* Process stuff until we're told to terminate.
220	*/
221	while (!ASMAtomicReadBool(&pTaskSet->fShutdown))
222	{
223	/*
224	* Process pending tasks.
225	*
226	* The outer loop runs till there are no more pending tasks.
227	*
228	* The inner loop takes one snapshot of fTriggered and processes all
229	* pending bits in the snaphot. This ensure fairness.
230	*/
231	for (;;)
232	{
233	uint64_t fTriggered = ASMAtomicReadU64(&pTaskSet->fTriggered);
234	unsigned iTask = ASMBitFirstSetU64(fTriggered);
235	if (iTask == 0)
236	break;
237	uint32_t cShutdown = 3;
238	do
239	{
240	iTask--;
241	AssertBreak(iTask < RT_ELEMENTS(pTaskSet->aTasks));
242
243	if (ASMAtomicBitTestAndClear(&pTaskSet->fTriggered, iTask))
244	{
245	PPDMTASK pTask = &pTaskSet->aTasks[iTask];
246
247	/* Copy out the data we need here to try avoid destruction race trouble. */
248	PDMTASKTYPE const enmType = pTask->enmType;
249	PFNRT const pfnCallback = pTask->pfnCallback;
250	void * const pvOwner = pTask->pvOwner;
251	void * const pvTaskUser = pTask->pvUser;
252
253	ASMAtomicWriteU32(&pTaskSet->idxRunning, iTask);
254
255	if ( pvOwner
256	&& pfnCallback
257	&& pvOwner == pTask->pvOwner
258	&& pfnCallback == pTask->pfnCallback
259	&& pvTaskUser == pTask->pvUser
260	&& enmType == pTask->enmType)
261	{
262	pTask->cRuns += 1;
263	switch (pTask->enmType)
264	{
265	case PDMTASKTYPE_DEV:
266	Log2(("pdmR3TaskThread: Runs dev task %s (%#x)\n", pTask->pszName, iTask + pTaskSet->uHandleBase));
267	((PFNPDMTASKDEV)(pfnCallback))((PPDMDEVINS)pvOwner, pvTaskUser);
268	break;
269	case PDMTASKTYPE_DRV:
270	Log2(("pdmR3TaskThread: Runs drv task %s (%#x)\n", pTask->pszName, iTask + pTaskSet->uHandleBase));
271	((PFNPDMTASKDRV)(pfnCallback))((PPDMDRVINS)pvOwner, pvTaskUser);
272	break;
273	case PDMTASKTYPE_USB:
274	Log2(("pdmR3TaskThread: Runs USB task %s (%#x)\n", pTask->pszName, iTask + pTaskSet->uHandleBase));
275	((PFNPDMTASKUSB)(pfnCallback))((PPDMUSBINS)pvOwner, pvTaskUser);
276	break;
277	case PDMTASKTYPE_INTERNAL:
278	Log2(("pdmR3TaskThread: Runs int task %s (%#x)\n", pTask->pszName, iTask + pTaskSet->uHandleBase));
279	((PFNPDMTASKINT)(pfnCallback))((PVM)pvOwner, pvTaskUser);
280	break;
281	default:
282	AssertFailed();
283	}
284	}
285	else /* Note! There might be a race here during destruction. */
286	AssertMsgFailed(("%d %p %p %p\n", enmType, pvOwner, pfnCallback, pvTaskUser));
287
288	ASMAtomicWriteU32(&pTaskSet->idxRunning, UINT32_MAX);
289	}
290
291	/* Next pending task. */
292	fTriggered &= ~RT_BIT_64(iTask);
293	iTask = ASMBitFirstSetU64(fTriggered);
294	} while (iTask != 0);
295
296	/*
297	* If we're shutting down, we'll try drain the pending tasks by
298	* looping three more times before just quitting. We don't want
299	* to get stuck here if some stuff is misbehaving.
300	*/
301	if (!ASMAtomicReadBool(&pTaskSet->fShutdown))
302	{ /* likely */ }
303	else if (--cShutdown == 0)
304	break;
305	}
306
307	/*
308	* Wait unless we're shutting down.
309	*/
310	if (!ASMAtomicReadBool(&pTaskSet->fShutdown))
311	{
312	if (pTaskSet->fRZEnabled)
313	SUPSemEventWaitNoResume(pTaskSet->pVM->pSession, pTaskSet->hEventR0, RT_MS_15SEC);
314	else
315	RTSemEventWaitNoResume(pTaskSet->hEventR3, RT_MS_15SEC);
316	}
317	}
318
319	/*
320	* Complain about pending tasks.
321	*/
322	uint64_t const fTriggered = ASMAtomicReadU64(&pTaskSet->fTriggered);
323	AssertLogRelMsg(fTriggered == 0, ("fTriggered=%#RX64 - %u %s\n", fTriggered, ASMBitFirstSetU64(fTriggered) - 1,
324	pTaskSet->aTasks[ASMBitFirstSetU64(fTriggered) - 1].pszName));
325
326	return VINF_SUCCESS;
327	}
328
329
330	/**
331	* Worker for PDMR3TaskCreate().
332	*/
333	DECLINLINE(PPDMTASK) pdmR3TaskAllocInSet(PPDMTASKSET pTaskSet)
334	{
335	if (pTaskSet->cAllocated < RT_ELEMENTS(pTaskSet->aTasks))
336	{
337	for (size_t j = 0; j < RT_ELEMENTS(pTaskSet->aTasks); j++)
338	if (pTaskSet->aTasks[j].pvOwner == NULL)
339	return &pTaskSet->aTasks[j];
340	AssertFailed();
341	}
342	return NULL;
343	}
344
345	/**
346	* Creates a task.
347	*
348	* @returns VBox status code.
349	* @param pVM The cross context VM structure.
350	* @param fFlags PDMTASK_F_XXX.
351	* @param pszName The task name (function name ++).
352	* @param enmType The task owner type.
353	* @param pvOwner The task owner pointer.
354	* @param pfnCallback The task callback.
355	* @param pvUser The user argument for the callback.
356	* @param phTask Where to return the task handle.
357	* @thread EMT(0)
358	*/
359	VMMR3_INT_DECL(int) PDMR3TaskCreate(PVM pVM, uint32_t fFlags, const char pszName, PDMTASKTYPE enmType, void pvOwner,
360	PFNRT pfnCallback, void pvUser, PDMTASKHANDLE phTask)
361	{
362	/*
363	* Validate input.
364	*/
365	AssertReturn(!(fFlags & ~PDMTASK_F_VALID_MASK), VERR_INVALID_FLAGS);
366	AssertPtrReturn(pvOwner, VERR_INVALID_POINTER);
367	AssertPtrReturn(pfnCallback, VERR_INVALID_POINTER);
368	AssertPtrReturn(pszName, VERR_INVALID_POINTER);
369	VM_ASSERT_VALID_EXT_RETURN(pVM, VERR_INVALID_VM_HANDLE);
370	VM_ASSERT_EMT0_RETURN(pVM, VERR_VM_THREAD_NOT_EMT); /* implicit serialization by requiring EMT(0) */
371	switch (enmType)
372	{
373	case PDMTASKTYPE_DEV:
374	case PDMTASKTYPE_DRV:
375	case PDMTASKTYPE_USB:
376	break;
377	case PDMTASKTYPE_INTERNAL:
378	AssertReturn(pvOwner == (void *)pVM, VERR_INVALID_PARAMETER);
379	break;
380	default:
381	AssertFailedReturn(VERR_INVALID_PARAMETER);
382	}
383
384	/*
385	* If the callback must be ring-0 triggerable, we are restricted to the
386	* task sets living the VM structure. Otherwise, pick from the dynamically
387	* allocated sets living on ring-3 heap.
388	*/
389	PPDMTASKSET pTaskSet = NULL;
390	PPDMTASK pTask = NULL;
391	if (fFlags & PDMTASK_F_RZ)
392	{
393	for (size_t i = 0; i < RT_ELEMENTS(pVM->pdm.s.aTaskSets); i++)
394	{
395	pTaskSet = &pVM->pdm.s.aTaskSets[i];
396	pTask = pdmR3TaskAllocInSet(pTaskSet);
397	if (pTask)
398	break;
399	}
400	}
401	else
402	{
403	for (size_t i = RT_ELEMENTS(pVM->pdm.s.aTaskSets); i < RT_ELEMENTS(pVM->pdm.s.apTaskSets); i++)
404	{
405	pTaskSet = pVM->pdm.s.apTaskSets[i];
406	if (pTaskSet)
407	{
408	pTask = pdmR3TaskAllocInSet(pTaskSet);
409	if (pTask)
410	break;
411	}
412	else
413	{
414	/*
415	* Try allocate a new set.
416	*/
417	LogFlow(("PDMR3TaskCreate: Allocating new task set (%#u)...\n", i));
418	pTaskSet = (PPDMTASKSET)MMR3HeapAllocZ(pVM, MM_TAG_PDM, sizeof(*pTaskSet));
419	AssertReturn(pTaskSet, VERR_NO_MEMORY);
420
421	pTaskSet->u32Magic = PDMTASKSET_MAGIC;
422	//pTaskSet->fRZEnabled = false;
423	//pTaskSet->cAllocated = 0;
424	pTaskSet->uHandleBase = (uint16_t)(i * RT_ELEMENTS(pTaskSet->aTasks));
425	pTaskSet->hThread = NIL_RTTHREAD;
426	pTaskSet->hEventR0 = NIL_SUPSEMEVENT;
427	int rc = RTSemEventCreate(&pTaskSet->hEventR3);
428	AssertRCReturnStmt(rc, MMR3HeapFree(pTaskSet), rc);
429	//pTaskSet->fTriggered = 0;
430	pTaskSet->idxRunning = UINT8_MAX;
431	//pTaskSet->fShutdown = false;
432	pTaskSet->pVM = pVM;
433
434	pVM->pdm.s.apTaskSets[i] = pTaskSet;
435	pTask = &pTaskSet->aTasks[0];
436	break;
437	}
438	}
439	}
440	AssertLogRelReturn(pTask, VERR_OUT_OF_RESOURCES);
441
442	/*
443	* Do we need to start a worker thread? Do this first as it can fail.
444	*/
445	if (pTaskSet->hThread == NIL_RTTHREAD)
446	{
447	int rc = RTThreadCreateF(&pTaskSet->hThread, pdmR3TaskThread, pTaskSet, 0 /cbStack/, RTTHREADTYPE_IO,
448	RTTHREADFLAGS_WAITABLE, "TaskSet%u", pTaskSet->uHandleBase / RT_ELEMENTS(pTaskSet->aTasks));
449	AssertLogRelRCReturn(rc, rc);
450	}
451
452	/*
453	* Complete the allocation.
454	*/
455	pTask->enmType = enmType;
456	pTask->fFlags = fFlags;
457	pTask->pvUser = pvUser;
458	pTask->pfnCallback = pfnCallback;
459	pTask->pszName = pszName;
460	ASMAtomicWritePtr(&pTask->pvOwner, pvOwner);
461	pTaskSet->cAllocated += 1;
462
463	uint32_t const hTask = pTaskSet->uHandleBase + (uint32_t)(pTask - &pTaskSet->aTasks[0]);
464	*phTask = hTask;
465
466	STAMR3RegisterF(pVM, &pTask->cRuns, STAMTYPE_U32_RESET, STAMVISIBILITY_ALWAYS, STAMUNIT_OCCURENCES,
467	"Number of times the task has been executed.", "/PDM/Tasks/%03u-%s-runs", hTask, pszName);
468	STAMR3RegisterF(pVM, (void *)&pTask->cAlreadyTrigged, STAMTYPE_U32_RESET, STAMVISIBILITY_ALWAYS, STAMUNIT_OCCURENCES,
469	"Number of times the task was re-triggered.", "/PDM/Tasks/%03u-%s-retriggered", hTask, pszName);
470
471	LogFlow(("PDMR3TaskCreate: Allocated %u for %s\n", hTask, pszName));
472	return VINF_SUCCESS;
473	}
474
475
476	/**
477	* Creates an internal task.
478	*
479	* @returns VBox status code.
480	* @param pVM The cross context VM structure.
481	* @param fFlags PDMTASK_F_XXX.
482	* @param pszName The task name (function name ++).
483	* @param pfnCallback The task callback.
484	* @param pvUser The user argument for the callback.
485	* @param phTask Where to return the task handle.
486	* @thread EMT(0)
487	*/
488	VMMR3_INT_DECL(int) PDMR3TaskCreateInternal(PVM pVM, uint32_t fFlags, const char *pszName,
489	PFNPDMTASKINT pfnCallback, void pvUser, PDMTASKHANDLE phTask)
490	{
491	return PDMR3TaskCreate(pVM, fFlags, pszName, PDMTASKTYPE_INTERNAL, pVM, (PFNRT)pfnCallback, pvUser, phTask);
492	}
493
494
495	/**
496	* Worker for PDMR3TaskDestroyAllByOwner() and PDMR3TaskDestroySpecific().
497	*/
498	static void pdmR3TaskDestroyOne(PVM pVM, PPDMTASKSET pTaskSet, PPDMTASK pTask, size_t iTask)
499	{
500	AssertPtr(pTask->pvOwner);
501
502	/*
503	* Delay if busy.
504	*/
505	uint32_t cYields = 64;
506	while ( ASMAtomicReadU32(&pTaskSet->idxRunning) == iTask
507	&& cYields > 0
508	&& pTaskSet->hThread != NIL_RTTHREAD)
509	{
510	ASMNopPause();
511	RTThreadYield();
512	}
513
514	/*
515	* Zap it (very noisy, but whatever).
516	*/
517	LogFlow(("pdmR3TaskDestroyOne: Destroying %zu %s\n", iTask + pTaskSet->uHandleBase, pTask->pszName));
518	AssertPtr(pTask->pvOwner);
519
520	char szPrefix[64];
521	RTStrPrintf(szPrefix, sizeof(szPrefix), "/PDM/Tasks/%03zu-", iTask + pTaskSet->uHandleBase);
522	STAMR3DeregisterByPrefix(pVM->pUVM, szPrefix);
523
524	AssertPtr(pTask->pvOwner);
525	ASMAtomicWriteNullPtr(&pTask->pvOwner);
526	pTask->enmType = (PDMTASKTYPE)0;
527	pTask->fFlags = 0;
528	ASMAtomicWriteNullPtr((void **)&pTask->pfnCallback);
529	ASMAtomicWriteNullPtr(&pTask->pvUser);
530	ASMAtomicWriteNullPtr(&pTask->pszName);
531
532	AssertReturnVoid(pTaskSet->cAllocated > 0);
533	pTaskSet->cAllocated -= 1;
534	}
535
536
537	/**
538	* Destroys all tasks belonging to @a pvOwner.
539	*
540	* @returns VBox status code.
541	* @param pVM The cross context VM structure.
542	* @param enmType The owner type.
543	* @param pvOwner The owner.
544	*/
545	VMMR3_INT_DECL(int) PDMR3TaskDestroyAllByOwner(PVM pVM, PDMTASKTYPE enmType, void *pvOwner)
546	{
547	/*
548	* Validate input.
549	*/
550	AssertReturn(enmType >= PDMTASKTYPE_DEV && enmType < PDMTASKTYPE_INTERNAL, VERR_INVALID_PARAMETER);
551	AssertPtrReturn(pvOwner, VERR_INVALID_POINTER);
552	VM_ASSERT_EMT0_RETURN(pVM, VERR_VM_THREAD_NOT_EMT); /* implicit serialization by requiring EMT(0) */
553
554	/*
555	* Scan all the task sets.
556	*/
557	for (size_t i = 0; i < RT_ELEMENTS(pVM->pdm.s.apTaskSets); i++)
558	{
559	PPDMTASKSET pTaskSet = pVM->pdm.s.apTaskSets[i];
560	if (pTaskSet)
561	{
562	ssize_t cLeft = pTaskSet->cAllocated;
563	for (size_t j = 0; j < RT_ELEMENTS(pTaskSet->aTasks) && cLeft > 0; j++)
564	{
565	PPDMTASK pTask = &pTaskSet->aTasks[j];
566	void * const pvTaskOwner = pTask->pvOwner;
567	if (pvTaskOwner)
568	{
569	if ( pvTaskOwner == pvOwner
570	&& pTask->enmType == enmType)
571	pdmR3TaskDestroyOne(pVM, pTaskSet, pTask, j);
572	else
573	Assert(pvTaskOwner != pvOwner);
574	cLeft--;
575	}
576	}
577	}
578	else
579	break;
580	}
581
582	return VINF_SUCCESS;
583	}
584
585
586	/**
587	* Destroys the task @a hTask.
588	*
589	* @returns VBox status code.
590	* @param pVM The cross context VM structure.
591	* @param enmType The owner type.
592	* @param pvOwner The owner.
593	* @param hTask Handle to the task to destroy.
594	*/
595	VMMR3_INT_DECL(int) PDMR3TaskDestroySpecific(PVM pVM, PDMTASKTYPE enmType, void *pvOwner, PDMTASKHANDLE hTask)
596	{
597	/*
598	* Validate the input.
599	*/
600	AssertReturn(enmType >= PDMTASKTYPE_DEV && enmType <= PDMTASKTYPE_INTERNAL, VERR_INVALID_PARAMETER);
601	AssertPtrReturn(pvOwner, VERR_INVALID_POINTER);
602
603	VM_ASSERT_VALID_EXT_RETURN(pVM, VERR_INVALID_VM_HANDLE);
604
605	size_t const iTask = hTask % RT_ELEMENTS(pVM->pdm.s.apTaskSets[0]->aTasks);
606	size_t const iTaskSet = hTask / RT_ELEMENTS(pVM->pdm.s.apTaskSets[0]->aTasks);
607	AssertReturn(iTaskSet < RT_ELEMENTS(pVM->pdm.s.apTaskSets), VERR_INVALID_HANDLE);
608	PPDMTASKSET const pTaskSet = pVM->pdm.s.apTaskSets[iTaskSet];
609	AssertPtrReturn(pTaskSet, VERR_INVALID_HANDLE);
610	AssertReturn(pTaskSet->u32Magic == PDMTASKSET_MAGIC, VERR_INVALID_MAGIC);
611	PPDMTASK const pTask = &pTaskSet->aTasks[iTask];
612
613	VM_ASSERT_EMT0_RETURN(pVM, VERR_VM_THREAD_NOT_EMT); /* implicit serialization by requiring EMT(0) */
614
615	AssertReturn(pTask->pvOwner == pvOwner, VERR_NOT_OWNER);
616	AssertReturn(pTask->enmType == enmType, VERR_NOT_OWNER);
617
618	/*
619	* Do the job.
620	*/
621	pdmR3TaskDestroyOne(pVM, pTaskSet, pTask, iTask);
622
623	return VINF_SUCCESS;
624	}
625
626
627	/**
628	* Destroys the internal task @a hTask.
629	*
630	* @returns VBox status code.
631	* @param pVM The cross context VM structure.
632	* @param hTask Handle to the task to destroy.
633	*/
634	VMMR3_INT_DECL(int) PDMR3TaskDestroyInternal(PVM pVM, PDMTASKHANDLE hTask)
635	{
636	return PDMR3TaskDestroySpecific(pVM, PDMTASKTYPE_INTERNAL, pVM, hTask);
637	}
638

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source: vbox/trunk/src/VBox/VMM/VMMR3/PDMR3Task.cpp@ 106842

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