PDMR3Task.cpp@ 91535

Last change on this file since 91535 was 85181, checked in by vboxsync, 4 years ago
VMM/PDMR3Task.cpp: Workaround for Clang 11 nothrow weirdness. bugref:9794
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1	/* $Id: PDMR3Task.cpp 85181 2020-07-10 13:20:04Z vboxsync $ */
2	/** @file
3	* PDM Task - Asynchronous user mode tasks.
4	*/
5
6	/*
7	* Copyright (C) 2019-2020 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
18
19	/*********************************************************************************************************************************
20	* Header Files *
21	*********************************************************************************************************************************/
22	#define LOG_GROUP LOG_GROUP_PDM_TASK
23	#include "PDMInternal.h"
24	#include <VBox/vmm/pdmtask.h>
25	#include <VBox/vmm/mm.h>
26	#include <VBox/vmm/vm.h>
27	#include <VBox/err.h>
28
29	#include <VBox/log.h>
30	#include <VBox/sup.h>
31	#include <iprt/asm.h>
32	#include <iprt/assert.h>
33	#include <iprt/semaphore.h>
34	#include <iprt/thread.h>
35
36
37	/**
38	* @callback_method_impl{FNDBGFINFOARGVINT}
39	*/
40	static DECLCALLBACK(void) pdmR3TaskInfo(PVM pVM, PCDBGFINFOHLP pHlp, int cArgs, char **papszArgs)
41	{
42	RT_NOREF(cArgs, papszArgs); /* for now. */
43
44	uint32_t cSetsDisplayed = 0;
45	for (size_t i = 0; i < RT_ELEMENTS(pVM->pdm.s.apTaskSets); i++)
46	{
47	PPDMTASKSET pTaskSet = pVM->pdm.s.apTaskSets[i];
48	if ( pTaskSet
49	&& ( pTaskSet->cAllocated > 0
50	\|\| ASMAtomicReadU64(&pTaskSet->fTriggered)))
51	{
52	if (cSetsDisplayed > 0)
53	pHlp->pfnPrintf(pHlp, "\n");
54	pHlp->pfnPrintf(pHlp,
55	"Task set #%u - handle base %u, pending %#RX64%s%s, running %d, %u of %u allocated:\n"
56	/* 123: triggered internal 0123456789abcdef 0123456789abcdef 0x0000 SomeFunctionName */
57	" Hnd: State Type pfnCallback pvUser Flags Name\n",
58	i, pTaskSet->uHandleBase, ASMAtomicReadU64(&pTaskSet->fTriggered),
59	pTaskSet->fRZEnabled ? " RZ-enabled" : "", pTaskSet->hThread != NIL_RTTHREAD ? "" : " no-thread",
60	(int)ASMAtomicReadU32(&pTaskSet->idxRunning), pTaskSet->cAllocated, RT_ELEMENTS(pTaskSet->aTasks));
61	for (unsigned j = 0; j < RT_ELEMENTS(pTaskSet->aTasks); j++)
62	{
63	PPDMTASK pTask = &pTaskSet->aTasks[j];
64	if (pTask->pvOwner)
65	{
66	const char *pszType;
67	switch (pTask->enmType)
68	{
69	case PDMTASKTYPE_DEV: pszType = " device "; break;
70	case PDMTASKTYPE_DRV: pszType = " driver "; break;
71	case PDMTASKTYPE_USB: pszType = " usbdev "; break;
72	case PDMTASKTYPE_INTERNAL: pszType = "internal"; break;
73	default: pszType = "unknown "; break;
74	}
75	pHlp->pfnPrintf(pHlp, " %3u: %s %s %p %p %#06x %s\n", pTaskSet->uHandleBase + j,
76	ASMBitTest(&pTaskSet->fTriggered, j) ? "triggered"
77	: ASMAtomicReadU32(&pTaskSet->idxRunning) == j ? " running " : " idle ",
78	pszType, pTask->pfnCallback, pTask->pvUser, pTask->fFlags, pTask->pszName);
79	}
80	}
81
82	cSetsDisplayed++;
83	}
84	}
85	}
86
87
88	/**
89	* Initializes the ring-0 capable tasks during VM construction.
90	*
91	* @returns VBox status code.
92	* @param pVM The cross context VM structure.
93	*/
94	int pdmR3TaskInit(PVM pVM)
95	{
96	for (size_t i = 0; i < RT_ELEMENTS(pVM->pdm.s.aTaskSets); i++)
97	{
98	PPDMTASKSET pTaskSet = &pVM->pdm.s.aTaskSets[i];
99
100	pTaskSet->u32Magic = PDMTASKSET_MAGIC;
101	pTaskSet->fRZEnabled = true;
102	//pTaskSet->cAllocated = 0;
103	pTaskSet->uHandleBase = (uint16_t)(i * RT_ELEMENTS(pTaskSet->aTasks));
104	pTaskSet->hThread = NIL_RTTHREAD;
105	int rc = SUPSemEventCreate(pVM->pSession, &pTaskSet->hEventR0);
106	AssertRCReturn(rc, rc);
107	pTaskSet->hEventR3 = NIL_RTSEMEVENT;
108	//pTaskSet->fTriggered = 0;
109	pTaskSet->idxRunning = UINT8_MAX;
110	//pTaskSet->fShutdown = false;
111	pTaskSet->pVM = pVM;
112
113	pVM->pdm.s.apTaskSets[i] = pTaskSet;
114	}
115
116	int rc = DBGFR3InfoRegisterInternalArgv(pVM, "tasks", "PDM tasks", pdmR3TaskInfo, 0 /fFlags/);
117	AssertRC(rc);
118
119	return VINF_SUCCESS;
120	}
121
122
123	/**
124	* Terminates task threads when the VM is destroyed.
125	*
126	* @param pVM The cross context VM structure.
127	*/
128	void pdmR3TaskTerm(PVM pVM)
129	{
130	/*
131	* Signal all the threads first.
132	*/
133	for (size_t i = 0; i < RT_ELEMENTS(pVM->pdm.s.apTaskSets); i++)
134	{
135	PPDMTASKSET pTaskSet = pVM->pdm.s.apTaskSets[i];
136	if (pTaskSet)
137	{
138	/*
139	* Set the shutdown indicator and signal the thread.
140	*/
141	ASMAtomicWriteBool(&pTaskSet->fShutdown, true);
142
143	if (pTaskSet->hEventR0 != NIL_SUPSEMEVENT)
144	{
145	int rc = SUPSemEventSignal(pVM->pSession, pTaskSet->hEventR0);
146	AssertRC(rc);
147	}
148
149	if (pTaskSet->hEventR3 != NIL_RTSEMEVENT)
150	{
151	int rc = RTSemEventSignal(pTaskSet->hEventR3);
152	AssertRC(rc);
153	}
154	}
155	}
156
157	/*
158	* Wait for them to terminate and clean up semaphores.
159	*/
160	for (size_t i = 0; i < RT_ELEMENTS(pVM->pdm.s.apTaskSets); i++)
161	{
162	PPDMTASKSET pTaskSet = pVM->pdm.s.apTaskSets[i];
163	if (pTaskSet)
164	{
165	/*
166	* Wait for the thread to terminate.
167	*/
168	if (pTaskSet->hThread != NIL_RTTHREAD)
169	{
170	int rc = RTThreadWait(pTaskSet->hThread, RT_MS_30SEC, NULL);
171	AssertLogRelMsg(RT_SUCCESS(rc), ("pTaskSet %u: thread wait failed: %Rrc\n", i, rc));
172	if (RT_SUCCESS(rc))
173	pTaskSet->hThread = NIL_RTTHREAD;
174	}
175
176	/*
177	* Destroy the semaphore.
178	*/
179	if (pTaskSet->hEventR0 != NIL_SUPSEMEVENT)
180	{
181	int rc = SUPSemEventClose(pVM->pSession, pTaskSet->hEventR0);
182	AssertRC(rc);
183	pTaskSet->hEventR0 = NIL_SUPSEMEVENT;
184	}
185
186	if (pTaskSet->hEventR3 != NIL_RTSEMEVENT)
187	{
188	int rc = RTSemEventDestroy(pTaskSet->hEventR3);
189	AssertRC(rc);
190	pTaskSet->hEventR3 = NIL_RTSEMEVENT;
191	}
192	}
193	}
194	}
195
196
197	/**
198	* @callback_method_impl{FNRTTHREAD,
199	* PDM Asynchronous Task Executor Thread}
200	*/
201	static DECLCALLBACK(int) pdmR3TaskThread(RTTHREAD ThreadSelf, void *pvUser)
202	{
203	PPDMTASKSET const pTaskSet = (PPDMTASKSET)pvUser;
204	AssertPtr(pTaskSet);
205	Assert(pTaskSet->u32Magic == PDMTASKSET_MAGIC);
206	RT_NOREF(ThreadSelf);
207
208	/*
209	* Process stuff until we're told to terminate.
210	*/
211	while (!ASMAtomicReadBool(&pTaskSet->fShutdown))
212	{
213	/*
214	* Process pending tasks.
215	*
216	* The outer loop runs till there are no more pending tasks.
217	*
218	* The inner loop takes one snapshot of fTriggered and processes all
219	* pending bits in the snaphot. This ensure fairness.
220	*/
221	for (;;)
222	{
223	uint64_t fTriggered = ASMAtomicReadU64(&pTaskSet->fTriggered);
224	unsigned iTask = ASMBitFirstSetU64(fTriggered);
225	if (iTask == 0)
226	break;
227	uint32_t cShutdown = 3;
228	do
229	{
230	iTask--;
231	AssertBreak(iTask < RT_ELEMENTS(pTaskSet->aTasks));
232
233	if (ASMAtomicBitTestAndClear(&pTaskSet->fTriggered, iTask))
234	{
235	PPDMTASK pTask = &pTaskSet->aTasks[iTask];
236
237	/* Copy out the data we need here to try avoid destruction race trouble. */
238	PDMTASKTYPE const enmType = pTask->enmType;
239	PFNRT const pfnCallback = pTask->pfnCallback;
240	void * const pvOwner = pTask->pvOwner;
241	void * const pvTaskUser = pTask->pvUser;
242
243	ASMAtomicWriteU32(&pTaskSet->idxRunning, iTask);
244
245	if ( pvOwner
246	&& pfnCallback
247	&& pvOwner == pTask->pvOwner
248	&& pfnCallback == pTask->pfnCallback
249	&& pvTaskUser == pTask->pvUser
250	&& enmType == pTask->enmType)
251	{
252	pTask->cRuns += 1;
253	switch (pTask->enmType)
254	{
255	case PDMTASKTYPE_DEV:
256	Log2(("pdmR3TaskThread: Runs dev task %s (%#x)\n", pTask->pszName, iTask + pTaskSet->uHandleBase));
257	((PFNPDMTASKDEV)(pfnCallback))((PPDMDEVINS)pvOwner, pvTaskUser);
258	break;
259	case PDMTASKTYPE_DRV:
260	Log2(("pdmR3TaskThread: Runs drv task %s (%#x)\n", pTask->pszName, iTask + pTaskSet->uHandleBase));
261	((PFNPDMTASKDRV)(pfnCallback))((PPDMDRVINS)pvOwner, pvTaskUser);
262	break;
263	case PDMTASKTYPE_USB:
264	Log2(("pdmR3TaskThread: Runs USB task %s (%#x)\n", pTask->pszName, iTask + pTaskSet->uHandleBase));
265	((PFNPDMTASKUSB)(pfnCallback))((PPDMUSBINS)pvOwner, pvTaskUser);
266	break;
267	case PDMTASKTYPE_INTERNAL:
268	Log2(("pdmR3TaskThread: Runs int task %s (%#x)\n", pTask->pszName, iTask + pTaskSet->uHandleBase));
269	((PFNPDMTASKINT)(pfnCallback))((PVM)pvOwner, pvTaskUser);
270	break;
271	default:
272	AssertFailed();
273	}
274	}
275	else /* Note! There might be a race here during destruction. */
276	AssertMsgFailed(("%d %p %p %p\n", enmType, pvOwner, pfnCallback, pvTaskUser));
277
278	ASMAtomicWriteU32(&pTaskSet->idxRunning, UINT32_MAX);
279	}
280
281	/* Next pending task. */
282	fTriggered &= ~RT_BIT_64(iTask);
283	iTask = ASMBitFirstSetU64(fTriggered);
284	} while (iTask != 0);
285
286	/*
287	* If we're shutting down, we'll try drain the pending tasks by
288	* looping three more times before just quitting. We don't want
289	* to get stuck here if some stuff is misbehaving.
290	*/
291	if (!ASMAtomicReadBool(&pTaskSet->fShutdown))
292	{ /* likely */ }
293	else if (--cShutdown == 0)
294	break;
295	}
296
297	/*
298	* Wait unless we're shutting down.
299	*/
300	if (!ASMAtomicReadBool(&pTaskSet->fShutdown))
301	{
302	if (pTaskSet->fRZEnabled)
303	SUPSemEventWaitNoResume(pTaskSet->pVM->pSession, pTaskSet->hEventR0, RT_MS_15SEC);
304	else
305	RTSemEventWaitNoResume(pTaskSet->hEventR3, RT_MS_15SEC);
306	}
307	}
308
309	/*
310	* Complain about pending tasks.
311	*/
312	uint64_t const fTriggered = ASMAtomicReadU64(&pTaskSet->fTriggered);
313	AssertLogRelMsg(fTriggered == 0, ("fTriggered=%#RX64 - %u %s\n", fTriggered, ASMBitFirstSetU64(fTriggered) - 1,
314	pTaskSet->aTasks[ASMBitFirstSetU64(fTriggered) - 1].pszName));
315
316	return VINF_SUCCESS;
317	}
318
319
320	/**
321	* Worker for PDMR3TaskCreate().
322	*/
323	DECLINLINE(PPDMTASK) pdmR3TaskAllocInSet(PPDMTASKSET pTaskSet)
324	{
325	if (pTaskSet->cAllocated < RT_ELEMENTS(pTaskSet->aTasks))
326	{
327	for (size_t j = 0; j < RT_ELEMENTS(pTaskSet->aTasks); j++)
328	if (pTaskSet->aTasks[j].pvOwner == NULL)
329	return &pTaskSet->aTasks[j];
330	AssertFailed();
331	}
332	return NULL;
333	}
334
335	/**
336	* Creates a task.
337	*
338	* @returns VBox status code.
339	* @param pVM The cross context VM structure.
340	* @param fFlags PDMTASK_F_XXX.
341	* @param pszName The task name (function name ++).
342	* @param enmType The task owner type.
343	* @param pvOwner The task owner pointer.
344	* @param pfnCallback The task callback.
345	* @param pvUser The user argument for the callback.
346	* @param phTask Where to return the task handle.
347	* @thread EMT(0)
348	*/
349	VMMR3_INT_DECL(int) PDMR3TaskCreate(PVM pVM, uint32_t fFlags, const char pszName, PDMTASKTYPE enmType, void pvOwner,
350	PFNRT pfnCallback, void pvUser, PDMTASKHANDLE phTask)
351	{
352	/*
353	* Validate input.
354	*/
355	AssertReturn(!(fFlags & ~PDMTASK_F_VALID_MASK), VERR_INVALID_FLAGS);
356	AssertPtrReturn(pvOwner, VERR_INVALID_POINTER);
357	AssertPtrReturn(pfnCallback, VERR_INVALID_POINTER);
358	AssertPtrReturn(pszName, VERR_INVALID_POINTER);
359	VM_ASSERT_VALID_EXT_RETURN(pVM, VERR_INVALID_VM_HANDLE);
360	VM_ASSERT_EMT0_RETURN(pVM, VERR_VM_THREAD_NOT_EMT); /* implicit serialization by requiring EMT(0) */
361	switch (enmType)
362	{
363	case PDMTASKTYPE_DEV:
364	case PDMTASKTYPE_DRV:
365	case PDMTASKTYPE_USB:
366	break;
367	case PDMTASKTYPE_INTERNAL:
368	AssertReturn(pvOwner == (void *)pVM, VERR_INVALID_PARAMETER);
369	break;
370	default:
371	AssertFailedReturn(VERR_INVALID_PARAMETER);
372	}
373
374	/*
375	* If the callback must be ring-0 triggerable, we are restricted to the
376	* task sets living the VM structure. Otherwise, pick from the dynamically
377	* allocated sets living on ring-3 heap.
378	*/
379	PPDMTASKSET pTaskSet = NULL;
380	PPDMTASK pTask = NULL;
381	if (fFlags & PDMTASK_F_RZ)
382	{
383	for (size_t i = 0; i < RT_ELEMENTS(pVM->pdm.s.aTaskSets); i++)
384	{
385	pTaskSet = &pVM->pdm.s.aTaskSets[i];
386	pTask = pdmR3TaskAllocInSet(pTaskSet);
387	if (pTask)
388	break;
389	}
390	}
391	else
392	{
393	for (size_t i = RT_ELEMENTS(pVM->pdm.s.aTaskSets); i < RT_ELEMENTS(pVM->pdm.s.apTaskSets); i++)
394	{
395	pTaskSet = pVM->pdm.s.apTaskSets[i];
396	if (pTaskSet)
397	{
398	pTask = pdmR3TaskAllocInSet(pTaskSet);
399	if (pTask)
400	break;
401	}
402	else
403	{
404	/*
405	* Try allocate a new set.
406	*/
407	LogFlow(("PDMR3TaskCreate: Allocating new task set (%#u)...\n", i));
408	pTaskSet = (PPDMTASKSET)MMR3HeapAllocZ(pVM, MM_TAG_PDM, sizeof(*pTaskSet));
409	AssertReturn(pTaskSet, VERR_NO_MEMORY);
410
411	pTaskSet->u32Magic = PDMTASKSET_MAGIC;
412	//pTaskSet->fRZEnabled = false;
413	//pTaskSet->cAllocated = 0;
414	pTaskSet->uHandleBase = (uint16_t)(i * RT_ELEMENTS(pTaskSet->aTasks));
415	pTaskSet->hThread = NIL_RTTHREAD;
416	pTaskSet->hEventR0 = NIL_SUPSEMEVENT;
417	int rc = RTSemEventCreate(&pTaskSet->hEventR3);
418	AssertRCReturnStmt(rc, MMR3HeapFree(pTaskSet), rc);
419	//pTaskSet->fTriggered = 0;
420	pTaskSet->idxRunning = UINT8_MAX;
421	//pTaskSet->fShutdown = false;
422	pTaskSet->pVM = pVM;
423
424	pVM->pdm.s.apTaskSets[i] = pTaskSet;
425	pTask = &pTaskSet->aTasks[0];
426	break;
427	}
428	}
429	}
430	AssertLogRelReturn(pTask, VERR_OUT_OF_RESOURCES);
431
432	/*
433	* Do we need to start a worker thread? Do this first as it can fail.
434	*/
435	if (pTaskSet->hThread == NIL_RTTHREAD)
436	{
437	int rc = RTThreadCreateF(&pTaskSet->hThread, pdmR3TaskThread, pTaskSet, 0 /cbStack/, RTTHREADTYPE_IO,
438	RTTHREADFLAGS_WAITABLE, "TaskSet%u", pTaskSet->uHandleBase / RT_ELEMENTS(pTaskSet->aTasks));
439	AssertLogRelRCReturn(rc, rc);
440	}
441
442	/*
443	* Complete the allocation.
444	*/
445	pTask->enmType = enmType;
446	pTask->fFlags = fFlags;
447	pTask->pvUser = pvUser;
448	pTask->pfnCallback = pfnCallback;
449	pTask->pszName = pszName;
450	ASMAtomicWritePtr(&pTask->pvOwner, pvOwner);
451	pTaskSet->cAllocated += 1;
452
453	uint32_t const hTask = pTaskSet->uHandleBase + (uint32_t)(pTask - &pTaskSet->aTasks[0]);
454	*phTask = hTask;
455
456	STAMR3RegisterF(pVM, &pTask->cRuns, STAMTYPE_U32_RESET, STAMVISIBILITY_ALWAYS, STAMUNIT_OCCURENCES,
457	"Number of times the task has been executed.", "/PDM/Tasks/%03u-%s-runs", hTask, pszName);
458	STAMR3RegisterF(pVM, (void *)&pTask->cAlreadyTrigged, STAMTYPE_U32_RESET, STAMVISIBILITY_ALWAYS, STAMUNIT_OCCURENCES,
459	"Number of times the task was re-triggered.", "/PDM/Tasks/%03u-%s-retriggered", hTask, pszName);
460
461	LogFlow(("PDMR3TaskCreate: Allocated %u for %s\n", hTask, pszName));
462	return VINF_SUCCESS;
463	}
464
465
466	/**
467	* Creates an internal task.
468	*
469	* @returns VBox status code.
470	* @param pVM The cross context VM structure.
471	* @param fFlags PDMTASK_F_XXX.
472	* @param pszName The task name (function name ++).
473	* @param pfnCallback The task callback.
474	* @param pvUser The user argument for the callback.
475	* @param phTask Where to return the task handle.
476	* @thread EMT(0)
477	*/
478	VMMR3_INT_DECL(int) PDMR3TaskCreateInternal(PVM pVM, uint32_t fFlags, const char *pszName,
479	PFNPDMTASKINT pfnCallback, void pvUser, PDMTASKHANDLE phTask)
480	{
481	return PDMR3TaskCreate(pVM, fFlags, pszName, PDMTASKTYPE_INTERNAL, pVM, (PFNRT)pfnCallback, pvUser, phTask);
482	}
483
484
485	/**
486	* Worker for PDMR3TaskDestroyAllByOwner() and PDMR3TaskDestroySpecific().
487	*/
488	static void pdmR3TaskDestroyOne(PVM pVM, PPDMTASKSET pTaskSet, PPDMTASK pTask, size_t iTask)
489	{
490	AssertPtr(pTask->pvOwner);
491
492	/*
493	* Delay if busy.
494	*/
495	uint32_t cYields = 64;
496	while ( ASMAtomicReadU32(&pTaskSet->idxRunning) == iTask
497	&& cYields > 0
498	&& pTaskSet->hThread != NIL_RTTHREAD)
499	{
500	ASMNopPause();
501	RTThreadYield();
502	}
503
504	/*
505	* Zap it (very noisy, but whatever).
506	*/
507	LogFlow(("pdmR3TaskDestroyOne: Destroying %zu %s\n", iTask + pTaskSet->uHandleBase, pTask->pszName));
508	AssertPtr(pTask->pvOwner);
509
510	char szPrefix[64];
511	RTStrPrintf(szPrefix, sizeof(szPrefix), "/PDM/Tasks/%03zu-", iTask + pTaskSet->uHandleBase);
512	STAMR3DeregisterByPrefix(pVM->pUVM, szPrefix);
513
514	AssertPtr(pTask->pvOwner);
515	ASMAtomicWriteNullPtr(&pTask->pvOwner);
516	pTask->enmType = (PDMTASKTYPE)0;
517	pTask->fFlags = 0;
518	ASMAtomicWriteNullPtr((void **)&pTask->pfnCallback);
519	ASMAtomicWriteNullPtr(&pTask->pvUser);
520	ASMAtomicWriteNullPtr(&pTask->pszName);
521
522	AssertReturnVoid(pTaskSet->cAllocated > 0);
523	pTaskSet->cAllocated -= 1;
524	}
525
526
527	/**
528	* Destroys all tasks belonging to @a pvOwner.
529	*
530	* @returns VBox status code.
531	* @param pVM The cross context VM structure.
532	* @param enmType The owner type.
533	* @param pvOwner The owner.
534	*/
535	VMMR3_INT_DECL(int) PDMR3TaskDestroyAllByOwner(PVM pVM, PDMTASKTYPE enmType, void *pvOwner)
536	{
537	/*
538	* Validate input.
539	*/
540	AssertReturn(enmType >= PDMTASKTYPE_DEV && enmType < PDMTASKTYPE_INTERNAL, VERR_INVALID_PARAMETER);
541	AssertPtrReturn(pvOwner, VERR_INVALID_POINTER);
542	VM_ASSERT_EMT0_RETURN(pVM, VERR_VM_THREAD_NOT_EMT); /* implicit serialization by requiring EMT(0) */
543
544	/*
545	* Scan all the task sets.
546	*/
547	for (size_t i = 0; i < RT_ELEMENTS(pVM->pdm.s.apTaskSets); i++)
548	{
549	PPDMTASKSET pTaskSet = pVM->pdm.s.apTaskSets[i];
550	if (pTaskSet)
551	{
552	ssize_t cLeft = pTaskSet->cAllocated;
553	for (size_t j = 0; j < RT_ELEMENTS(pTaskSet->aTasks) && cLeft > 0; j++)
554	{
555	PPDMTASK pTask = &pTaskSet->aTasks[j];
556	void * const pvTaskOwner = pTask->pvOwner;
557	if (pvTaskOwner)
558	{
559	if ( pvTaskOwner == pvOwner
560	&& pTask->enmType == enmType)
561	pdmR3TaskDestroyOne(pVM, pTaskSet, pTask, j);
562	else
563	Assert(pvTaskOwner != pvOwner);
564	cLeft--;
565	}
566	}
567	}
568	else
569	break;
570	}
571
572	return VINF_SUCCESS;
573	}
574
575
576	/**
577	* Destroys the task @a hTask.
578	*
579	* @returns VBox status code.
580	* @param pVM The cross context VM structure.
581	* @param enmType The owner type.
582	* @param pvOwner The owner.
583	* @param hTask Handle to the task to destroy.
584	*/
585	VMMR3_INT_DECL(int) PDMR3TaskDestroySpecific(PVM pVM, PDMTASKTYPE enmType, void *pvOwner, PDMTASKHANDLE hTask)
586	{
587	/*
588	* Validate the input.
589	*/
590	AssertReturn(enmType >= PDMTASKTYPE_DEV && enmType <= PDMTASKTYPE_INTERNAL, VERR_INVALID_PARAMETER);
591	AssertPtrReturn(pvOwner, VERR_INVALID_POINTER);
592
593	VM_ASSERT_VALID_EXT_RETURN(pVM, VERR_INVALID_VM_HANDLE);
594
595	size_t const iTask = hTask % RT_ELEMENTS(pVM->pdm.s.apTaskSets[0]->aTasks);
596	size_t const iTaskSet = hTask / RT_ELEMENTS(pVM->pdm.s.apTaskSets[0]->aTasks);
597	AssertReturn(iTaskSet < RT_ELEMENTS(pVM->pdm.s.apTaskSets), VERR_INVALID_HANDLE);
598	PPDMTASKSET const pTaskSet = pVM->pdm.s.apTaskSets[iTaskSet];
599	AssertPtrReturn(pTaskSet, VERR_INVALID_HANDLE);
600	AssertPtrReturn(pTaskSet->u32Magic == PDMTASKSET_MAGIC, VERR_INVALID_MAGIC);
601	PPDMTASK const pTask = &pTaskSet->aTasks[iTask];
602
603	VM_ASSERT_EMT0_RETURN(pVM, VERR_VM_THREAD_NOT_EMT); /* implicit serialization by requiring EMT(0) */
604
605	AssertPtrReturn(pTask->pvOwner == pvOwner, VERR_NOT_OWNER);
606	AssertPtrReturn(pTask->enmType == enmType, VERR_NOT_OWNER);
607
608	/*
609	* Do the job.
610	*/
611	pdmR3TaskDestroyOne(pVM, pTaskSet, pTask, iTask);
612
613	return VINF_SUCCESS;
614	}
615
616
617	/**
618	* Destroys the internal task @a hTask.
619	*
620	* @returns VBox status code.
621	* @param pVM The cross context VM structure.
622	* @param hTask Handle to the task to destroy.
623	*/
624	VMMR3_INT_DECL(int) PDMR3TaskDestroyInternal(PVM pVM, PDMTASKHANDLE hTask)
625	{
626	return PDMR3TaskDestroySpecific(pVM, PDMTASKTYPE_INTERNAL, pVM, hTask);
627	}
628

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source: vbox/trunk/src/VBox/VMM/VMMR3/PDMR3Task.cpp@ 91535

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