HGCMThread.cpp@ 94952

Last change on this file since 94952 was 94952, checked in by vboxsync, 3 years ago
Main/src-client/HGCMThread.cpp: Adjust to the new rules wrt. to rc -> hrc,vrc usage, bugref:10223
Property svn:eol-style set to `native` Property svn:keywords set to `Author Date Id Revision`
File size: 23.1 KB

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1	/* $Id: HGCMThread.cpp 94952 2022-05-09 11:59:04Z vboxsync $ */
2	/** @file
3	* HGCMThread - Host-Guest Communication Manager Threads
4	*/
5
6	/*
7	* Copyright (C) 2006-2022 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	#define LOG_GROUP LOG_GROUP_HGCM
19	#include "LoggingNew.h"
20
21	#include "HGCMThread.h"
22
23	#include <VBox/err.h>
24	#include <VBox/vmm/stam.h>
25	#include <VBox/vmm/vmmr3vtable.h>
26	#include <iprt/semaphore.h>
27	#include <iprt/thread.h>
28	#include <iprt/string.h>
29
30	#include <new> /* for std:nothrow */
31
32
33	/* HGCM uses worker threads, which process messages from other threads.
34	* A message consists of the message header and message specific data.
35	* Message header is opaque for callers, but message data is defined
36	* and used by them.
37	*
38	* Messages are distinguished by message identifier and worker thread
39	* they are allocated for.
40	*
41	* Messages are allocated for a worker thread and belong to
42	* the thread. A worker thread holds the queue of messages.
43	*
44	* The calling thread creates a message, specifying which worker thread
45	* the message is created for, then, optionally, initializes message
46	* specific data and, also optionally, references the message.
47	*
48	* Message then is posted or sent to worker thread by inserting
49	* it to the worker thread message queue and referencing the message.
50	* Worker thread then again may fetch next message.
51	*
52	* Upon processing the message the worker thread dereferences it.
53	* Dereferencing also automatically deletes message from the thread
54	* queue and frees memory allocated for the message, if no more
55	* references left. If there are references, the message remains
56	* in the queue.
57	*
58	*/
59
60	/* Version of HGCM message header */
61	#define HGCMMSG_VERSION (1)
62
63	/* Thread is initializing. */
64	#define HGCMMSG_TF_INITIALIZING (0x00000001)
65	/* Thread must be terminated. */
66	#define HGCMMSG_TF_TERMINATE (0x00000002)
67	/* Thread has been terminated. */
68	#define HGCMMSG_TF_TERMINATED (0x00000004)
69
70	/** @todo consider use of RTReq */
71
72	static DECLCALLBACK(int) hgcmWorkerThreadFunc(RTTHREAD ThreadSelf, void *pvUser);
73
74	class HGCMThread : public HGCMReferencedObject
75	{
76	private:
77	friend DECLCALLBACK(int) hgcmWorkerThreadFunc(RTTHREAD ThreadSelf, void *pvUser);
78
79	/* Worker thread function. */
80	PFNHGCMTHREAD m_pfnThread;
81
82	/* A user supplied thread parameter. */
83	void *m_pvUser;
84
85	/* The thread runtime handle. */
86	RTTHREAD m_hThread;
87
88	/** Event the thread waits for, signalled when a message to process is posted to
89	* the thread, automatically reset. */
90	RTSEMEVENT m_eventThread;
91
92	/* A caller thread waits for completion of a SENT message on this event. */
93	RTSEMEVENTMULTI m_eventSend;
94	int32_t volatile m_i32MessagesProcessed;
95
96	/* Critical section for accessing the thread data, mostly for message queues. */
97	RTCRITSECT m_critsect;
98
99	/* thread state/operation flags */
100	uint32_t m_fu32ThreadFlags;
101
102	/* Message queue variables. Messages are inserted at tail of message
103	* queue. They are consumed by worker thread sequentially. If a message was
104	* consumed, it is removed from message queue.
105	*/
106
107	/* Head of message queue. */
108	HGCMMsgCore *m_pMsgInputQueueHead;
109	/* Message which another message will be inserted after. */
110	HGCMMsgCore *m_pMsgInputQueueTail;
111
112	/* Head of messages being processed queue. */
113	HGCMMsgCore *m_pMsgInProcessHead;
114	/* Message which another message will be inserted after. */
115	HGCMMsgCore *m_pMsgInProcessTail;
116
117	/* Head of free message structures list. */
118	HGCMMsgCore *m_pFreeHead;
119	/* Tail of free message structures list. */
120	HGCMMsgCore *m_pFreeTail;
121
122	/** @name Statistics
123	* @{ */
124	STAMCOUNTER m_StatPostMsgNoPending;
125	STAMCOUNTER m_StatPostMsgOnePending;
126	STAMCOUNTER m_StatPostMsgTwoPending;
127	STAMCOUNTER m_StatPostMsgThreePending;
128	STAMCOUNTER m_StatPostMsgManyPending;
129	/** @} */
130
131	inline int Enter(void);
132	inline void Leave(void);
133
134	HGCMMsgCore *FetchFreeListHead(void);
135
136	protected:
137	virtual ~HGCMThread(void);
138
139	public:
140
141	HGCMThread ();
142
143	int WaitForTermination (void);
144
145	int Initialize(const char pszThreadName, PFNHGCMTHREAD pfnThread, void pvUser,
146	const char *pszStatsSubDir, PUVM pUVM, PCVMMR3VTABLE pVMM);
147
148	int MsgAlloc(HGCMMsgCore **pMsg, uint32_t u32MsgId, PFNHGCMNEWMSGALLOC pfnNewMessage);
149	int MsgGet(HGCMMsgCore **ppMsg);
150	int MsgPost(HGCMMsgCore *pMsg, PFNHGCMMSGCALLBACK pfnCallback, bool bWait);
151	int MsgComplete(HGCMMsgCore *pMsg, int32_t result);
152	};
153
154
155	/*
156	* HGCMMsgCore implementation.
157	*/
158
159	#define HGCM_MSG_F_PROCESSED (0x00000001)
160	#define HGCM_MSG_F_WAIT (0x00000002)
161	#define HGCM_MSG_F_IN_PROCESS (0x00000004)
162
163	void HGCMMsgCore::InitializeCore(uint32_t u32MsgId, HGCMThread *pThread)
164	{
165	m_u32Version = HGCMMSG_VERSION;
166	m_u32Msg = u32MsgId;
167	m_pfnCallback = NULL;
168	m_pNext = NULL;
169	m_pPrev = NULL;
170	m_fu32Flags = 0;
171	m_rcSend = VINF_SUCCESS;
172	m_pThread = pThread;
173	pThread->Reference();
174	}
175
176	/* virtual */ HGCMMsgCore::~HGCMMsgCore()
177	{
178	if (m_pThread)
179	{
180	m_pThread->Dereference();
181	m_pThread = NULL;
182	}
183	}
184
185	/*
186	* HGCMThread implementation.
187	*/
188
189	static DECLCALLBACK(int) hgcmWorkerThreadFunc(RTTHREAD hThreadSelf, void *pvUser)
190	{
191	HGCMThread pThread = (HGCMThread )pvUser;
192
193	LogFlow(("MAIN::hgcmWorkerThreadFunc: starting HGCM thread %p\n", pThread));
194
195	AssertRelease(pThread);
196
197	pThread->m_hThread = hThreadSelf;
198	pThread->m_fu32ThreadFlags &= ~HGCMMSG_TF_INITIALIZING;
199	int vrc = RTThreadUserSignal(hThreadSelf);
200	AssertRC(vrc);
201
202	pThread->m_pfnThread(pThread, pThread->m_pvUser);
203
204	pThread->m_fu32ThreadFlags \|= HGCMMSG_TF_TERMINATED;
205
206	LogFlow(("MAIN::hgcmWorkerThreadFunc: completed HGCM thread %p\n", pThread));
207
208	return vrc;
209	}
210
211	HGCMThread::HGCMThread()
212	:
213	HGCMReferencedObject(HGCMOBJ_THREAD),
214	m_pfnThread(NULL),
215	m_pvUser(NULL),
216	m_hThread(NIL_RTTHREAD),
217	m_eventThread(NIL_RTSEMEVENT),
218	m_eventSend(NIL_RTSEMEVENTMULTI),
219	m_i32MessagesProcessed(0),
220	m_fu32ThreadFlags(0),
221	m_pMsgInputQueueHead(NULL),
222	m_pMsgInputQueueTail(NULL),
223	m_pMsgInProcessHead(NULL),
224	m_pMsgInProcessTail(NULL),
225	m_pFreeHead(NULL),
226	m_pFreeTail(NULL)
227	{
228	RT_ZERO(m_critsect);
229	}
230
231	HGCMThread::~HGCMThread()
232	{
233	/*
234	* Free resources allocated for the thread.
235	*/
236
237	Assert(m_fu32ThreadFlags & HGCMMSG_TF_TERMINATED);
238
239	if (RTCritSectIsInitialized(&m_critsect))
240	RTCritSectDelete(&m_critsect);
241
242	if (m_eventSend != NIL_RTSEMEVENTMULTI)
243	{
244	RTSemEventMultiDestroy(m_eventSend);
245	m_eventSend = NIL_RTSEMEVENTMULTI;
246	}
247
248	if (m_eventThread != NIL_RTSEMEVENT)
249	{
250	RTSemEventDestroy(m_eventThread);
251	m_eventThread = NIL_RTSEMEVENT;
252	}
253	}
254
255	int HGCMThread::WaitForTermination(void)
256	{
257	int vrc = VINF_SUCCESS;
258	LogFlowFunc(("\n"));
259
260	if (m_hThread != NIL_RTTHREAD)
261	{
262	vrc = RTThreadWait(m_hThread, 5000, NULL);
263	m_hThread = NIL_RTTHREAD;
264	}
265
266	LogFlowFunc(("vrc = %Rrc\n", vrc));
267	return vrc;
268	}
269
270	int HGCMThread::Initialize(const char pszThreadName, PFNHGCMTHREAD pfnThread, void pvUser,
271	const char *pszStatsSubDir, PUVM pUVM, PCVMMR3VTABLE pVMM)
272	{
273	int vrc = RTSemEventCreate(&m_eventThread);
274
275	if (RT_SUCCESS(vrc))
276	{
277	vrc = RTSemEventMultiCreate(&m_eventSend);
278
279	if (RT_SUCCESS(vrc))
280	{
281	vrc = RTCritSectInit(&m_critsect);
282
283	if (RT_SUCCESS(vrc))
284	{
285	m_pfnThread = pfnThread;
286	m_pvUser = pvUser;
287
288	m_fu32ThreadFlags = HGCMMSG_TF_INITIALIZING;
289
290	RTTHREAD hThread;
291	vrc = RTThreadCreate(&hThread, hgcmWorkerThreadFunc, this, 0, /* default stack size; some services
292	may need quite a bit */
293	RTTHREADTYPE_IO, RTTHREADFLAGS_WAITABLE,
294	pszThreadName);
295
296	if (RT_SUCCESS(vrc))
297	{
298	/* Register statistics while the thread starts. */
299	if (pUVM)
300	{
301	pVMM->pfnSTAMR3RegisterFU(pUVM, &m_StatPostMsgNoPending, STAMTYPE_COUNTER, STAMVISIBILITY_ALWAYS,
302	STAMUNIT_COUNT, "Times a message was appended to an empty input queue.",
303	"/HGCM/%s/PostMsg0Pending", pszStatsSubDir);
304	pVMM->pfnSTAMR3RegisterFU(pUVM, &m_StatPostMsgOnePending, STAMTYPE_COUNTER, STAMVISIBILITY_ALWAYS,
305	STAMUNIT_COUNT,
306	"Times a message was appended to input queue with only one pending message.",
307	"/HGCM/%s/PostMsg1Pending", pszStatsSubDir);
308	pVMM->pfnSTAMR3RegisterFU(pUVM, &m_StatPostMsgTwoPending, STAMTYPE_COUNTER, STAMVISIBILITY_ALWAYS,
309	STAMUNIT_COUNT,
310	"Times a message was appended to input queue with only one pending message.",
311	"/HGCM/%s/PostMsg2Pending", pszStatsSubDir);
312	pVMM->pfnSTAMR3RegisterFU(pUVM, &m_StatPostMsgThreePending, STAMTYPE_COUNTER, STAMVISIBILITY_ALWAYS,
313	STAMUNIT_COUNT,
314	"Times a message was appended to input queue with only one pending message.",
315	"/HGCM/%s/PostMsg3Pending", pszStatsSubDir);
316	pVMM->pfnSTAMR3RegisterFU(pUVM, &m_StatPostMsgManyPending, STAMTYPE_COUNTER, STAMVISIBILITY_ALWAYS,
317	STAMUNIT_COUNT,
318	"Times a message was appended to input queue with only one pending message.",
319	"/HGCM/%s/PostMsgManyPending", pszStatsSubDir);
320	}
321
322
323	/* Wait until the thread is ready. */
324	vrc = RTThreadUserWait(hThread, 30000);
325	AssertRC(vrc);
326	Assert(!(m_fu32ThreadFlags & HGCMMSG_TF_INITIALIZING) \|\| RT_FAILURE(vrc));
327	}
328	else
329	{
330	m_hThread = NIL_RTTHREAD;
331	Log(("hgcmThreadCreate: FAILURE: Can't start worker thread.\n"));
332	}
333	}
334	else
335	{
336	Log(("hgcmThreadCreate: FAILURE: Can't init a critical section for a hgcm worker thread.\n"));
337	RT_ZERO(m_critsect);
338	}
339	}
340	else
341	{
342	Log(("hgcmThreadCreate: FAILURE: Can't create an event semaphore for a sent messages.\n"));
343	m_eventSend = NIL_RTSEMEVENTMULTI;
344	}
345	}
346	else
347	{
348	Log(("hgcmThreadCreate: FAILURE: Can't create an event semaphore for a hgcm worker thread.\n"));
349	m_eventThread = NIL_RTSEMEVENT;
350	}
351
352	return vrc;
353	}
354
355	inline int HGCMThread::Enter(void)
356	{
357	int vrc = RTCritSectEnter(&m_critsect);
358
359	#ifdef LOG_ENABLED
360	if (RT_FAILURE(vrc))
361	Log(("HGCMThread::MsgPost: FAILURE: could not obtain worker thread mutex, vrc = %Rrc!!!\n", vrc));
362	#endif
363
364	return vrc;
365	}
366
367	inline void HGCMThread::Leave(void)
368	{
369	RTCritSectLeave(&m_critsect);
370	}
371
372
373	int HGCMThread::MsgAlloc(HGCMMsgCore **ppMsg, uint32_t u32MsgId, PFNHGCMNEWMSGALLOC pfnNewMessage)
374	{
375	/** @todo Implement this free list / cache thingy. */
376	HGCMMsgCore *pmsg = NULL;
377
378	bool fFromFreeList = false;
379
380	if (!pmsg)
381	{
382	/* We have to allocate a new memory block. */
383	pmsg = pfnNewMessage(u32MsgId);
384	if (pmsg != NULL)
385	pmsg->Reference(); /* (it's created with zero references) */
386	else
387	return VERR_NO_MEMORY;
388	}
389
390	/* Initialize just allocated message core */
391	pmsg->InitializeCore(u32MsgId, this);
392
393	/* and the message specific data. */
394	pmsg->Initialize();
395
396	LogFlow(("MAIN::hgcmMsgAlloc: allocated message %p\n", pmsg));
397
398	*ppMsg = pmsg;
399
400	if (fFromFreeList)
401	{
402	/* Message was referenced in the free list, now dereference it. */
403	pmsg->Dereference();
404	}
405
406	return VINF_SUCCESS;
407	}
408
409	int HGCMThread::MsgPost(HGCMMsgCore *pMsg, PFNHGCMMSGCALLBACK pfnCallback, bool fWait)
410	{
411	LogFlow(("HGCMThread::MsgPost: thread = %p, pMsg = %p, pfnCallback = %p\n", this, pMsg, pfnCallback));
412
413	int vrc = Enter();
414
415	if (RT_SUCCESS(vrc))
416	{
417	pMsg->m_pfnCallback = pfnCallback;
418
419	if (fWait)
420	pMsg->m_fu32Flags \|= HGCM_MSG_F_WAIT;
421
422	/* Insert the message to the queue tail. */
423	pMsg->m_pNext = NULL;
424	HGCMMsgCore * const pPrev = m_pMsgInputQueueTail;
425	pMsg->m_pPrev = pPrev;
426
427	if (pPrev)
428	{
429	pPrev->m_pNext = pMsg;
430	if (!pPrev->m_pPrev)
431	STAM_REL_COUNTER_INC(&m_StatPostMsgOnePending);
432	else if (!pPrev->m_pPrev)
433	STAM_REL_COUNTER_INC(&m_StatPostMsgTwoPending);
434	else if (!pPrev->m_pPrev->m_pPrev)
435	STAM_REL_COUNTER_INC(&m_StatPostMsgThreePending);
436	else
437	STAM_REL_COUNTER_INC(&m_StatPostMsgManyPending);
438	}
439	else
440	{
441	m_pMsgInputQueueHead = pMsg;
442	STAM_REL_COUNTER_INC(&m_StatPostMsgNoPending);
443	}
444
445	m_pMsgInputQueueTail = pMsg;
446
447	Leave();
448
449	LogFlow(("HGCMThread::MsgPost: going to inform the thread %p about message, fWait = %d\n", this, fWait));
450
451	/* Inform the worker thread that there is a message. */
452	RTSemEventSignal(m_eventThread);
453
454	LogFlow(("HGCMThread::MsgPost: event signalled\n"));
455
456	if (fWait)
457	{
458	/* Immediately check if the message has been processed. */
459	while ((pMsg->m_fu32Flags & HGCM_MSG_F_PROCESSED) == 0)
460	{
461	/* Poll infrequently to make sure no completed message has been missed. */
462	RTSemEventMultiWait(m_eventSend, 1000);
463
464	LogFlow(("HGCMThread::MsgPost: wait completed flags = %08X\n", pMsg->m_fu32Flags));
465
466	if ((pMsg->m_fu32Flags & HGCM_MSG_F_PROCESSED) == 0)
467	RTThreadYield();
468	}
469
470	/* 'Our' message has been processed, so should reset the semaphore.
471	* There is still possible that another message has been processed
472	* and the semaphore has been signalled again.
473	* Reset only if there are no other messages completed.
474	*/
475	int32_t c = ASMAtomicDecS32(&m_i32MessagesProcessed);
476	Assert(c >= 0);
477	if (c == 0)
478	RTSemEventMultiReset(m_eventSend);
479
480	vrc = pMsg->m_rcSend;
481	}
482	}
483
484	LogFlow(("HGCMThread::MsgPost: vrc = %Rrc\n", vrc));
485	return vrc;
486	}
487
488
489	int HGCMThread::MsgGet(HGCMMsgCore **ppMsg)
490	{
491	int vrc = VINF_SUCCESS;
492
493	LogFlow(("HGCMThread::MsgGet: thread = %p, ppMsg = %p\n", this, ppMsg));
494
495	for (;;)
496	{
497	if (m_fu32ThreadFlags & HGCMMSG_TF_TERMINATE)
498	{
499	vrc = VERR_INTERRUPTED;
500	break;
501	}
502
503	LogFlow(("MAIN::hgcmMsgGet: m_pMsgInputQueueHead = %p\n", m_pMsgInputQueueHead));
504
505	if (m_pMsgInputQueueHead)
506	{
507	/* Move the message to the m_pMsgInProcessHead list */
508	vrc = Enter();
509
510	if (RT_FAILURE(vrc))
511	{
512	break;
513	}
514
515	HGCMMsgCore *pMsg = m_pMsgInputQueueHead;
516
517	/* Remove the message from the head of Queue list. */
518	Assert(m_pMsgInputQueueHead->m_pPrev == NULL);
519
520	if (m_pMsgInputQueueHead->m_pNext)
521	{
522	m_pMsgInputQueueHead = m_pMsgInputQueueHead->m_pNext;
523	m_pMsgInputQueueHead->m_pPrev = NULL;
524	}
525	else
526	{
527	Assert(m_pMsgInputQueueHead == m_pMsgInputQueueTail);
528
529	m_pMsgInputQueueHead = NULL;
530	m_pMsgInputQueueTail = NULL;
531	}
532
533	/* Insert the message to the tail of the m_pMsgInProcessHead list. */
534	pMsg->m_pNext = NULL;
535	pMsg->m_pPrev = m_pMsgInProcessTail;
536
537	if (m_pMsgInProcessTail)
538	m_pMsgInProcessTail->m_pNext = pMsg;
539	else
540	m_pMsgInProcessHead = pMsg;
541
542	m_pMsgInProcessTail = pMsg;
543
544	pMsg->m_fu32Flags \|= HGCM_MSG_F_IN_PROCESS;
545
546	Leave();
547
548	/* Return the message to the caller. */
549	*ppMsg = pMsg;
550
551	LogFlow(("MAIN::hgcmMsgGet: got message %p\n", *ppMsg));
552
553	break;
554	}
555
556	/* Wait for an event. */
557	RTSemEventWait(m_eventThread, RT_INDEFINITE_WAIT);
558	}
559
560	LogFlow(("HGCMThread::MsgGet: ppMsg = %p, return vrc = %Rrc\n", ppMsg, vrc));
561	return vrc;
562	}
563
564	int HGCMThread::MsgComplete(HGCMMsgCore *pMsg, int32_t result)
565	{
566	LogFlow(("HGCMThread::MsgComplete: thread = %p, pMsg = %p, result = %Rrc (%d)\n", this, pMsg, result, result));
567
568	AssertRelease(pMsg->m_pThread == this);
569	AssertReleaseMsg((pMsg->m_fu32Flags & HGCM_MSG_F_IN_PROCESS) != 0, ("%p %x\n", pMsg, pMsg->m_fu32Flags));
570
571	int vrcRet = VINF_SUCCESS;
572	if (pMsg->m_pfnCallback)
573	{
574	/** @todo call callback with error code in MsgPost in case of errors */
575
576	vrcRet = pMsg->m_pfnCallback(result, pMsg);
577
578	LogFlow(("HGCMThread::MsgComplete: callback executed. pMsg = %p, thread = %p, rcRet = %Rrc\n", pMsg, this, vrcRet));
579	}
580
581	/* Message processing has been completed. */
582
583	int vrc = Enter();
584
585	if (RT_SUCCESS(vrc))
586	{
587	/* Remove the message from the InProcess queue. */
588
589	if (pMsg->m_pNext)
590	pMsg->m_pNext->m_pPrev = pMsg->m_pPrev;
591	else
592	m_pMsgInProcessTail = pMsg->m_pPrev;
593
594	if (pMsg->m_pPrev)
595	pMsg->m_pPrev->m_pNext = pMsg->m_pNext;
596	else
597	m_pMsgInProcessHead = pMsg->m_pNext;
598
599	pMsg->m_pNext = NULL;
600	pMsg->m_pPrev = NULL;
601
602	bool fWaited = ((pMsg->m_fu32Flags & HGCM_MSG_F_WAIT) != 0);
603
604	if (fWaited)
605	{
606	ASMAtomicIncS32(&m_i32MessagesProcessed);
607
608	/* This should be done before setting the HGCM_MSG_F_PROCESSED flag. */
609	pMsg->m_rcSend = result;
610	}
611
612	/* The message is now completed. */
613	pMsg->m_fu32Flags &= ~HGCM_MSG_F_IN_PROCESS;
614	pMsg->m_fu32Flags &= ~HGCM_MSG_F_WAIT;
615	pMsg->m_fu32Flags \|= HGCM_MSG_F_PROCESSED;
616
617	pMsg->Dereference();
618
619	Leave();
620
621	if (fWaited)
622	{
623	/* Wake up all waiters. so they can decide if their message has been processed. */
624	RTSemEventMultiSignal(m_eventSend);
625	}
626	}
627
628	return vrcRet;
629	}
630
631	/*
632	* Thread API. Public interface.
633	*/
634
635	int hgcmThreadCreate(HGCMThread *ppThread, const char pszThreadName, PFNHGCMTHREAD pfnThread, void *pvUser,
636	const char *pszStatsSubDir, PUVM pUVM, PCVMMR3VTABLE pVMM)
637	{
638	LogFlow(("MAIN::hgcmThreadCreate\n"));
639	int vrc;
640
641	/* Allocate memory for a new thread object. */
642	HGCMThread *pThread = new (std::nothrow) HGCMThread();
643
644	if (pThread)
645	{
646	pThread->Reference(); /* (it's created with zero references) */
647
648	/* Initialize the object. */
649	vrc = pThread->Initialize(pszThreadName, pfnThread, pvUser, pszStatsSubDir, pUVM, pVMM);
650	if (RT_SUCCESS(vrc))
651	{
652	*ppThread = pThread;
653	LogFlow(("MAIN::hgcmThreadCreate: vrc = %Rrc\n", vrc));
654	return vrc;
655	}
656
657	Log(("hgcmThreadCreate: FAILURE: Initialize failed: vrc = %Rrc\n", vrc));
658
659	pThread->Dereference();
660	}
661	else
662	{
663	Log(("hgcmThreadCreate: FAILURE: Can't allocate memory for a hgcm worker thread.\n"));
664	vrc = VERR_NO_MEMORY;
665	}
666	*ppThread = NULL;
667
668	LogFlow(("MAIN::hgcmThreadCreate: vrc = %Rrc\n", vrc));
669	return vrc;
670	}
671
672	int hgcmThreadWait(HGCMThread *pThread)
673	{
674	LogFlowFunc(("%p\n", pThread));
675
676	int vrc;
677	if (pThread)
678	{
679	vrc = pThread->WaitForTermination();
680
681	pThread->Dereference();
682	}
683	else
684	vrc = VERR_INVALID_HANDLE;
685
686	LogFlowFunc(("vrc = %Rrc\n", vrc));
687	return vrc;
688	}
689
690	int hgcmMsgAlloc(HGCMThread pThread, HGCMMsgCore *ppMsg, uint32_t u32MsgId, PFNHGCMNEWMSGALLOC pfnNewMessage)
691	{
692	LogFlow(("hgcmMsgAlloc: pThread = %p, ppMsg = %p, sizeof (HGCMMsgCore) = %d\n", pThread, ppMsg, sizeof(HGCMMsgCore)));
693
694	AssertReturn(pThread, VERR_INVALID_HANDLE);
695	AssertReturn(ppMsg, VERR_INVALID_PARAMETER);
696
697	int vrc = pThread->MsgAlloc(ppMsg, u32MsgId, pfnNewMessage);
698
699	LogFlow(("MAIN::hgcmMsgAlloc: ppMsg = %p, vrc = %Rrc\n", ppMsg, vrc));
700	return vrc;
701	}
702
703	DECLINLINE(int) hgcmMsgPostInternal(HGCMMsgCore *pMsg, PFNHGCMMSGCALLBACK pfnCallback, bool fWait)
704	{
705	LogFlow(("MAIN::hgcmMsgPostInternal: pMsg = %p, pfnCallback = %p, fWait = %d\n", pMsg, pfnCallback, fWait));
706	Assert(pMsg);
707
708	pMsg->Reference(); /* paranoia? */
709
710	int vrc = pMsg->Thread()->MsgPost(pMsg, pfnCallback, fWait);
711
712	pMsg->Dereference();
713
714	LogFlow(("MAIN::hgcmMsgPostInternal: pMsg = %p, vrc = %Rrc\n", pMsg, vrc));
715	return vrc;
716	}
717
718	int hgcmMsgPost(HGCMMsgCore *pMsg, PFNHGCMMSGCALLBACK pfnCallback)
719	{
720	int vrc = hgcmMsgPostInternal(pMsg, pfnCallback, false);
721
722	if (RT_SUCCESS(vrc))
723	vrc = VINF_HGCM_ASYNC_EXECUTE;
724
725	return vrc;
726	}
727
728	int hgcmMsgSend(HGCMMsgCore *pMsg)
729	{
730	return hgcmMsgPostInternal(pMsg, NULL, true);
731	}
732
733	int hgcmMsgGet(HGCMThread pThread, HGCMMsgCore *ppMsg)
734	{
735	LogFlow(("MAIN::hgcmMsgGet: pThread = %p, ppMsg = %p\n", pThread, ppMsg));
736
737	AssertReturn(pThread, VERR_INVALID_HANDLE);
738	AssertReturn(ppMsg, VERR_INVALID_PARAMETER);
739
740	pThread->Reference(); /* paranoia */
741
742	int vrc = pThread->MsgGet(ppMsg);
743
744	pThread->Dereference();
745
746	LogFlow(("MAIN::hgcmMsgGet: ppMsg = %p, vrc = %Rrc\n", ppMsg, vrc));
747	return vrc;
748	}
749
750	int hgcmMsgComplete(HGCMMsgCore *pMsg, int32_t rcMsg)
751	{
752	LogFlow(("MAIN::hgcmMsgComplete: pMsg = %p, rcMsg = %Rrc (%d)\n", pMsg, rcMsg, rcMsg));
753
754	int vrc;
755	if (pMsg)
756	vrc = pMsg->Thread()->MsgComplete(pMsg, rcMsg);
757	else
758	vrc = VINF_SUCCESS;
759
760	LogFlow(("MAIN::hgcmMsgComplete: pMsg = %p, rcMsg =%Rrc (%d), returns vrc = %Rrc\n", pMsg, rcMsg, rcMsg, vrc));
761	return vrc;
762	}
763
764	int hgcmThreadInit(void)
765	{
766	LogFlow(("MAIN::hgcmThreadInit\n"));
767
768	/** @todo error processing. */
769
770	int vrc = hgcmObjInit();
771
772	LogFlow(("MAIN::hgcmThreadInit: vrc = %Rrc\n", vrc));
773	return vrc;
774	}
775
776	void hgcmThreadUninit(void)
777	{
778	hgcmObjUninit();
779	}
780

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source: vbox/trunk/src/VBox/Main/src-client/HGCMThread.cpp@ 94952

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