HGCMThread.cpp@ 72098

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1	/* $Id: HGCMThread.cpp 69500 2017-10-28 15:14:05Z vboxsync $ */
2	/** @file
3	* HGCMThread - Host-Guest Communication Manager Threads
4	*/
5
6	/*
7	* Copyright (C) 2006-2017 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 <iprt/semaphore.h>
25	#include <iprt/thread.h>
26	#include <iprt/string.h>
27
28
29	/* HGCM uses worker threads, which process messages from other threads.
30	* A message consists of the message header and message specific data.
31	* Message header is opaque for callers, but message data is defined
32	* and used by them.
33	*
34	* Messages are distinguished by message identifier and worker thread
35	* they are allocated for.
36	*
37	* Messages are allocated for a worker thread and belong to
38	* the thread. A worker thread holds the queue of messages.
39	*
40	* The calling thread creates a message, specifying which worker thread
41	* the message is created for, then, optionally, initializes message
42	* specific data and, also optionally, references the message.
43	*
44	* Message then is posted or sent to worker thread by inserting
45	* it to the worker thread message queue and referencing the message.
46	* Worker thread then again may fetch next message.
47	*
48	* Upon processing the message the worker thread dereferences it.
49	* Dereferencing also automatically deletes message from the thread
50	* queue and frees memory allocated for the message, if no more
51	* references left. If there are references, the message remains
52	* in the queue.
53	*
54	*/
55
56	/* Version of HGCM message header */
57	#define HGCMMSG_VERSION (1)
58
59	/* Thread is initializing. */
60	#define HGCMMSG_TF_INITIALIZING (0x00000001)
61	/* Thread must be terminated. */
62	#define HGCMMSG_TF_TERMINATE (0x00000002)
63	/* Thread has been terminated. */
64	#define HGCMMSG_TF_TERMINATED (0x00000004)
65
66	/** @todo consider use of RTReq */
67
68	static DECLCALLBACK(int) hgcmWorkerThreadFunc (RTTHREAD ThreadSelf, void *pvUser);
69
70	class HGCMThread: public HGCMObject
71	{
72	private:
73	friend DECLCALLBACK(int) hgcmWorkerThreadFunc (RTTHREAD ThreadSelf, void *pvUser);
74
75	/* Worker thread function. */
76	PFNHGCMTHREAD m_pfnThread;
77
78	/* A user supplied thread parameter. */
79	void *m_pvUser;
80
81	/* The thread runtime handle. */
82	RTTHREAD m_thread;
83
84	/* Event the thread waits for, signalled when a message
85	* to process is posted to the thread.
86	*/
87	RTSEMEVENTMULTI m_eventThread;
88
89	/* A caller thread waits for completion of a SENT message on this event. */
90	RTSEMEVENTMULTI m_eventSend;
91	int32_t volatile m_i32MessagesProcessed;
92
93	/* Critical section for accessing the thread data, mostly for message queues. */
94	RTCRITSECT m_critsect;
95
96	/* thread state/operation flags */
97	uint32_t m_fu32ThreadFlags;
98
99	/* Message queue variables. Messages are inserted at tail of message
100	* queue. They are consumed by worker thread sequentially. If a message was
101	* consumed, it is removed from message queue.
102	*/
103
104	/* Head of message queue. */
105	HGCMMsgCore *m_pMsgInputQueueHead;
106	/* Message which another message will be inserted after. */
107	HGCMMsgCore *m_pMsgInputQueueTail;
108
109	/* Head of messages being processed queue. */
110	HGCMMsgCore *m_pMsgInProcessHead;
111	/* Message which another message will be inserted after. */
112	HGCMMsgCore *m_pMsgInProcessTail;
113
114	/* Head of free message structures list. */
115	HGCMMsgCore *m_pFreeHead;
116	/* Tail of free message structures list. */
117	HGCMMsgCore *m_pFreeTail;
118
119	HGCMTHREADHANDLE m_handle;
120
121	inline int Enter (void);
122	inline void Leave (void);
123
124	HGCMMsgCore *FetchFreeListHead (void);
125
126	protected:
127	virtual ~HGCMThread (void);
128
129	public:
130
131	HGCMThread ();
132
133	int WaitForTermination (void);
134
135	int Initialize (HGCMTHREADHANDLE handle, const char pszThreadName, PFNHGCMTHREAD pfnThread, void pvUser);
136
137	int MsgAlloc (HGCMMSGHANDLE *pHandle, uint32_t u32MsgId, PFNHGCMNEWMSGALLOC pfnNewMessage);
138	int MsgGet (HGCMMsgCore **ppMsg);
139	int MsgPost (HGCMMsgCore *pMsg, PHGCMMSGCALLBACK pfnCallback, bool bWait);
140	void MsgComplete (HGCMMsgCore *pMsg, int32_t result);
141	};
142
143
144	/*
145	* HGCMMsgCore implementation.
146	*/
147
148	#define HGCM_MSG_F_PROCESSED (0x00000001)
149	#define HGCM_MSG_F_WAIT (0x00000002)
150	#define HGCM_MSG_F_IN_PROCESS (0x00000004)
151
152	void HGCMMsgCore::InitializeCore (uint32_t u32MsgId, HGCMTHREADHANDLE hThread)
153	{
154	m_u32Version = HGCMMSG_VERSION;
155	m_u32Msg = u32MsgId;
156	m_pfnCallback = NULL;
157	m_pNext = NULL;
158	m_pPrev = NULL;
159	m_fu32Flags = 0;
160	m_rcSend = VINF_SUCCESS;
161
162	m_pThread = (HGCMThread *)hgcmObjReference (hThread, HGCMOBJ_THREAD);
163	AssertRelease (m_pThread);
164	}
165
166	/* virtual */ HGCMMsgCore::~HGCMMsgCore ()
167	{
168	if (m_pThread)
169	{
170	hgcmObjDereference (m_pThread);
171	m_pThread = NULL;
172	}
173	}
174
175	/*
176	* HGCMThread implementation.
177	*/
178
179	static DECLCALLBACK(int) hgcmWorkerThreadFunc (RTTHREAD ThreadSelf, void *pvUser)
180	{
181	int rc = VINF_SUCCESS;
182
183	HGCMThread pThread = (HGCMThread )pvUser;
184
185	LogFlow(("MAIN::hgcmWorkerThreadFunc: starting HGCM thread %p\n", pThread));
186
187	AssertRelease(pThread);
188
189	pThread->m_thread = ThreadSelf;
190	pThread->m_fu32ThreadFlags &= ~HGCMMSG_TF_INITIALIZING;
191	rc = RTThreadUserSignal (ThreadSelf);
192	AssertRC(rc);
193
194	pThread->m_pfnThread (pThread->Handle (), pThread->m_pvUser);
195
196	pThread->m_fu32ThreadFlags \|= HGCMMSG_TF_TERMINATED;
197
198	pThread->m_thread = NIL_RTTHREAD;
199
200	LogFlow(("MAIN::hgcmWorkerThreadFunc: completed HGCM thread %p\n", pThread));
201
202	return rc;
203	}
204
205	HGCMThread::HGCMThread ()
206	:
207	HGCMObject(HGCMOBJ_THREAD),
208	m_pfnThread (NULL),
209	m_pvUser (NULL),
210	m_thread (NIL_RTTHREAD),
211	m_eventThread (0),
212	m_eventSend (0),
213	m_i32MessagesProcessed (0),
214	m_fu32ThreadFlags (0),
215	m_pMsgInputQueueHead (NULL),
216	m_pMsgInputQueueTail (NULL),
217	m_pMsgInProcessHead (NULL),
218	m_pMsgInProcessTail (NULL),
219	m_pFreeHead (NULL),
220	m_pFreeTail (NULL),
221	m_handle (0)
222	{
223	RT_ZERO(m_critsect);
224	}
225
226	HGCMThread::~HGCMThread ()
227	{
228	/*
229	* Free resources allocated for the thread.
230	*/
231
232	Assert(m_fu32ThreadFlags & HGCMMSG_TF_TERMINATED);
233
234	if (RTCritSectIsInitialized (&m_critsect))
235	{
236	RTCritSectDelete (&m_critsect);
237	}
238
239	if (m_eventSend)
240	{
241	RTSemEventMultiDestroy (m_eventSend);
242	}
243
244	if (m_eventThread)
245	{
246	RTSemEventMultiDestroy (m_eventThread);
247	}
248
249	return;
250	}
251
252	int HGCMThread::WaitForTermination (void)
253	{
254	int rc = VINF_SUCCESS;
255	LogFlowFunc(("\n"));
256
257	if (m_thread != NIL_RTTHREAD)
258	{
259	rc = RTThreadWait (m_thread, 5000, NULL);
260	}
261
262	LogFlowFunc(("rc = %Rrc\n", rc));
263	return rc;
264	}
265
266	int HGCMThread::Initialize (HGCMTHREADHANDLE handle, const char pszThreadName, PFNHGCMTHREAD pfnThread, void pvUser)
267	{
268	int rc = VINF_SUCCESS;
269
270	rc = RTSemEventMultiCreate (&m_eventThread);
271
272	if (RT_SUCCESS(rc))
273	{
274	rc = RTSemEventMultiCreate (&m_eventSend);
275
276	if (RT_SUCCESS(rc))
277	{
278	rc = RTCritSectInit (&m_critsect);
279
280	if (RT_SUCCESS(rc))
281	{
282	m_pfnThread = pfnThread;
283	m_pvUser = pvUser;
284	m_handle = handle;
285
286	m_fu32ThreadFlags = HGCMMSG_TF_INITIALIZING;
287
288	RTTHREAD thread;
289	rc = RTThreadCreate (&thread, hgcmWorkerThreadFunc, this, 0, /* default stack size; some service
290	may need quite a bit */
291	RTTHREADTYPE_IO, RTTHREADFLAGS_WAITABLE,
292	pszThreadName);
293
294	if (RT_SUCCESS(rc))
295	{
296	/* Wait until the thread is ready. */
297	rc = RTThreadUserWait (thread, 30000);
298	AssertRC(rc);
299	Assert(!(m_fu32ThreadFlags & HGCMMSG_TF_INITIALIZING) \|\| RT_FAILURE(rc));
300	}
301	else
302	{
303	m_thread = NIL_RTTHREAD;
304	Log(("hgcmThreadCreate: FAILURE: Can't start worker thread.\n"));
305	}
306	}
307	else
308	{
309	Log(("hgcmThreadCreate: FAILURE: Can't init a critical section for a hgcm worker thread.\n"));
310	RT_ZERO(m_critsect);
311	}
312	}
313	else
314	{
315	Log(("hgcmThreadCreate: FAILURE: Can't create an event semaphore for a sent messages.\n"));
316	m_eventSend = 0;
317	}
318	}
319	else
320	{
321	Log(("hgcmThreadCreate: FAILURE: Can't create an event semaphore for a hgcm worker thread.\n"));
322	m_eventThread = 0;
323	}
324
325	return rc;
326	}
327
328	inline int HGCMThread::Enter (void)
329	{
330	int rc = RTCritSectEnter (&m_critsect);
331
332	#ifdef LOG_ENABLED
333	if (RT_FAILURE(rc))
334	{
335	Log(("HGCMThread::MsgPost: FAILURE: could not obtain worker thread mutex, rc = %Rrc!!!\n", rc));
336	}
337	#endif /* LOG_ENABLED */
338
339	return rc;
340	}
341
342	inline void HGCMThread::Leave (void)
343	{
344	RTCritSectLeave (&m_critsect);
345	}
346
347
348	int HGCMThread::MsgAlloc (HGCMMSGHANDLE *pHandle, uint32_t u32MsgId, PFNHGCMNEWMSGALLOC pfnNewMessage)
349	{
350	int rc = VINF_SUCCESS;
351
352	HGCMMsgCore *pmsg = NULL;
353
354	bool fFromFreeList = false;
355
356	if (!pmsg && RT_SUCCESS(rc))
357	{
358	/* We have to allocate a new memory block. */
359	pmsg = pfnNewMessage (u32MsgId);
360
361	if (pmsg == NULL)
362	{
363	rc = VERR_NO_MEMORY;
364	}
365	}
366
367	if (RT_SUCCESS(rc))
368	{
369	/* Initialize just allocated message core */
370	pmsg->InitializeCore (u32MsgId, m_handle);
371
372	/* and the message specific data. */
373	pmsg->Initialize ();
374
375	LogFlow(("MAIN::hgcmMsgAlloc: allocated message %p\n", pmsg));
376
377	/** Get handle of the message. The message will be also referenced
378	* until the handle is deleted.
379	*/
380	*pHandle = hgcmObjGenerateHandle (pmsg);
381
382	if (fFromFreeList)
383	{
384	/* Message was referenced in the free list, now dereference it. */
385	pmsg->Dereference ();
386	}
387	}
388
389	return rc;
390	}
391
392	int HGCMThread::MsgPost (HGCMMsgCore *pMsg, PHGCMMSGCALLBACK pfnCallback, bool fWait)
393	{
394	int rc = VINF_SUCCESS;
395
396	LogFlow(("HGCMThread::MsgPost: thread = %p, pMsg = %p, pfnCallback = %p\n", this, pMsg, pfnCallback));
397
398	rc = Enter ();
399
400	if (RT_SUCCESS(rc))
401	{
402	pMsg->m_pfnCallback = pfnCallback;
403
404	if (fWait)
405	{
406	pMsg->m_fu32Flags \|= HGCM_MSG_F_WAIT;
407	}
408
409	/* Insert the message to the queue tail. */
410	pMsg->m_pNext = NULL;
411	pMsg->m_pPrev = m_pMsgInputQueueTail;
412
413	if (m_pMsgInputQueueTail)
414	{
415	m_pMsgInputQueueTail->m_pNext = pMsg;
416	}
417	else
418	{
419	m_pMsgInputQueueHead = pMsg;
420	}
421
422	m_pMsgInputQueueTail = pMsg;
423
424	Leave ();
425
426	LogFlow(("HGCMThread::MsgPost: going to inform the thread %p about message, fWait = %d\n", this, fWait));
427
428	/* Inform the worker thread that there is a message. */
429	RTSemEventMultiSignal (m_eventThread);
430
431	LogFlow(("HGCMThread::MsgPost: event signalled\n"));
432
433	if (fWait)
434	{
435	/* Immediately check if the message has been processed. */
436	while ((pMsg->m_fu32Flags & HGCM_MSG_F_PROCESSED) == 0)
437	{
438	/* Poll infrequently to make sure no completed message has been missed. */
439	RTSemEventMultiWait (m_eventSend, 1000);
440
441	LogFlow(("HGCMThread::MsgPost: wait completed flags = %08X\n", pMsg->m_fu32Flags));
442
443	if ((pMsg->m_fu32Flags & HGCM_MSG_F_PROCESSED) == 0)
444	{
445	RTThreadYield();
446	}
447	}
448
449	/* 'Our' message has been processed, so should reset the semaphore.
450	* There is still possible that another message has been processed
451	* and the semaphore has been signalled again.
452	* Reset only if there are no other messages completed.
453	*/
454	int32_t c = ASMAtomicDecS32(&m_i32MessagesProcessed);
455	Assert(c >= 0);
456	if (c == 0)
457	{
458	RTSemEventMultiReset (m_eventSend);
459	}
460
461	rc = pMsg->m_rcSend;
462	}
463	}
464
465	LogFlow(("HGCMThread::MsgPost: rc = %Rrc\n", rc));
466
467	return rc;
468	}
469
470
471	int HGCMThread::MsgGet (HGCMMsgCore **ppMsg)
472	{
473	int rc = VINF_SUCCESS;
474
475	LogFlow(("HGCMThread::MsgGet: thread = %p, ppMsg = %p\n", this, ppMsg));
476
477	for (;;)
478	{
479	if (m_fu32ThreadFlags & HGCMMSG_TF_TERMINATE)
480	{
481	rc = VERR_INTERRUPTED;
482	break;
483	}
484
485	LogFlow(("MAIN::hgcmMsgGet: m_pMsgInputQueueHead = %p\n", m_pMsgInputQueueHead));
486
487	if (m_pMsgInputQueueHead)
488	{
489	/* Move the message to the m_pMsgInProcessHead list */
490	rc = Enter ();
491
492	if (RT_FAILURE(rc))
493	{
494	break;
495	}
496
497	HGCMMsgCore *pMsg = m_pMsgInputQueueHead;
498
499	/* Remove the message from the head of Queue list. */
500	Assert(m_pMsgInputQueueHead->m_pPrev == NULL);
501
502	if (m_pMsgInputQueueHead->m_pNext)
503	{
504	m_pMsgInputQueueHead = m_pMsgInputQueueHead->m_pNext;
505	m_pMsgInputQueueHead->m_pPrev = NULL;
506	}
507	else
508	{
509	Assert(m_pMsgInputQueueHead == m_pMsgInputQueueTail);
510
511	m_pMsgInputQueueHead = NULL;
512	m_pMsgInputQueueTail = NULL;
513	}
514
515	/* Insert the message to the tail of the m_pMsgInProcessHead list. */
516	pMsg->m_pNext = NULL;
517	pMsg->m_pPrev = m_pMsgInProcessTail;
518
519	if (m_pMsgInProcessTail)
520	{
521	m_pMsgInProcessTail->m_pNext = pMsg;
522	}
523	else
524	{
525	m_pMsgInProcessHead = pMsg;
526	}
527
528	m_pMsgInProcessTail = pMsg;
529
530	pMsg->m_fu32Flags \|= HGCM_MSG_F_IN_PROCESS;
531
532	Leave ();
533
534	/* Return the message to the caller. */
535	*ppMsg = pMsg;
536
537	LogFlow(("MAIN::hgcmMsgGet: got message %p\n", *ppMsg));
538
539	break;
540	}
541
542	/* Wait for an event. */
543	RTSemEventMultiWait (m_eventThread, RT_INDEFINITE_WAIT);
544	RTSemEventMultiReset (m_eventThread);
545	}
546
547	LogFlow(("HGCMThread::MsgGet: ppMsg = %p, return rc = %Rrc\n", ppMsg, rc));
548
549	return rc;
550	}
551
552	void HGCMThread::MsgComplete (HGCMMsgCore *pMsg, int32_t result)
553	{
554	LogFlow(("HGCMThread::MsgComplete: thread = %p, pMsg = %p\n", this, pMsg));
555
556	int rc = VINF_SUCCESS;
557
558	AssertRelease(pMsg->m_pThread == this);
559	AssertReleaseMsg((pMsg->m_fu32Flags & HGCM_MSG_F_IN_PROCESS) != 0, ("%p %x\n", pMsg, pMsg->m_fu32Flags));
560
561	if (pMsg->m_pfnCallback)
562	{
563	/** @todo call callback with error code in MsgPost in case of errors */
564
565	pMsg->m_pfnCallback (result, pMsg);
566
567	LogFlow(("HGCMThread::MsgComplete: callback executed. pMsg = %p, thread = %p\n", pMsg, this));
568	}
569
570	/* Message processing has been completed. */
571
572	rc = Enter ();
573
574	if (RT_SUCCESS(rc))
575	{
576	/* Remove the message from the InProcess queue. */
577
578	if (pMsg->m_pNext)
579	{
580	pMsg->m_pNext->m_pPrev = pMsg->m_pPrev;
581	}
582	else
583	{
584	m_pMsgInProcessTail = pMsg->m_pPrev;
585	}
586
587	if (pMsg->m_pPrev)
588	{
589	pMsg->m_pPrev->m_pNext = pMsg->m_pNext;
590	}
591	else
592	{
593	m_pMsgInProcessHead = pMsg->m_pNext;
594	}
595
596	pMsg->m_pNext = NULL;
597	pMsg->m_pPrev = NULL;
598
599	bool fWaited = ((pMsg->m_fu32Flags & HGCM_MSG_F_WAIT) != 0);
600
601	if (fWaited)
602	{
603	ASMAtomicIncS32(&m_i32MessagesProcessed);
604
605	/* This should be done before setting the HGCM_MSG_F_PROCESSED flag. */
606	pMsg->m_rcSend = result;
607	}
608
609	/* The message is now completed. */
610	pMsg->m_fu32Flags &= ~HGCM_MSG_F_IN_PROCESS;
611	pMsg->m_fu32Flags &= ~HGCM_MSG_F_WAIT;
612	pMsg->m_fu32Flags \|= HGCM_MSG_F_PROCESSED;
613
614	hgcmObjDeleteHandle (pMsg->Handle ());
615
616	Leave ();
617
618	if (fWaited)
619	{
620	/* Wake up all waiters. so they can decide if their message has been processed. */
621	RTSemEventMultiSignal (m_eventSend);
622	}
623	}
624
625	return;
626	}
627
628	/*
629	* Thread API. Public interface.
630	*/
631
632	int hgcmThreadCreate (HGCMTHREADHANDLE pHandle, const char pszThreadName, PFNHGCMTHREAD pfnThread, void *pvUser)
633	{
634	int rc = VINF_SUCCESS;
635
636	LogFlow(("MAIN::hgcmThreadCreate\n"));
637
638	HGCMTHREADHANDLE handle = 0;
639
640	/* Allocate memory for a new thread object. */
641	HGCMThread *pThread = new HGCMThread ();
642
643	if (pThread)
644	{
645	/* Put just created object to pool and obtain handle for it. */
646	handle = hgcmObjGenerateHandle (pThread);
647
648	/* Initialize the object. */
649	rc = pThread->Initialize (handle, pszThreadName, pfnThread, pvUser);
650	}
651	else
652	{
653	Log(("hgcmThreadCreate: FAILURE: Can't allocate memory for a hgcm worker thread.\n"));
654	rc = VERR_NO_MEMORY;
655	}
656
657	if (RT_SUCCESS(rc))
658	{
659	*pHandle = handle;
660	}
661	else
662	{
663	Log(("hgcmThreadCreate: FAILURE: rc = %Rrc.\n", rc));
664
665	if (handle != 0)
666	{
667	/* Delete allocated handle, this will also free the object memory. */
668	hgcmObjDeleteHandle (handle);
669	}
670	}
671
672	LogFlow(("MAIN::hgcmThreadCreate: rc = %Rrc\n", rc));
673
674	return rc;
675	}
676
677	int hgcmThreadWait (HGCMTHREADHANDLE hThread)
678	{
679	int rc = VERR_INVALID_HANDLE;
680	LogFlowFunc(("0x%08X\n", hThread));
681
682	HGCMThread pThread = (HGCMThread )hgcmObjReference (hThread, HGCMOBJ_THREAD);
683
684	if (pThread)
685	{
686	rc = pThread->WaitForTermination ();
687
688	hgcmObjDereference (pThread);
689	}
690
691	hgcmObjDeleteHandle (hThread);
692
693	LogFlowFunc(("rc = %Rrc\n", rc));
694	return rc;
695	}
696
697	int hgcmMsgAlloc (HGCMTHREADHANDLE hThread, HGCMMSGHANDLE *pHandle, uint32_t u32MsgId, PFNHGCMNEWMSGALLOC pfnNewMessage)
698	{
699	LogFlow(("hgcmMsgAlloc: thread handle = 0x%08X, pHandle = %p, sizeof (HGCMMsgCore) = %d\n",
700	hThread, pHandle, sizeof (HGCMMsgCore)));
701
702	if (!pHandle)
703	{
704	return VERR_INVALID_PARAMETER;
705	}
706
707	int rc = VINF_SUCCESS;
708
709	HGCMThread pThread = (HGCMThread )hgcmObjReference (hThread, HGCMOBJ_THREAD);
710
711	if (!pThread)
712	{
713	rc = VERR_INVALID_HANDLE;
714	}
715	else
716	{
717	rc = pThread->MsgAlloc (pHandle, u32MsgId, pfnNewMessage);
718
719	hgcmObjDereference (pThread);
720	}
721
722	LogFlow(("MAIN::hgcmMsgAlloc: handle 0x%08X, rc = %Rrc\n", *pHandle, rc));
723
724	return rc;
725	}
726
727	static int hgcmMsgPostInternal (HGCMMSGHANDLE hMsg, PHGCMMSGCALLBACK pfnCallback, bool fWait)
728	{
729	LogFlow(("MAIN::hgcmMsgPostInternal: hMsg = 0x%08X, pfnCallback = %p, fWait = %d\n", hMsg, pfnCallback, fWait));
730
731	int rc = VINF_SUCCESS;
732
733	HGCMMsgCore pMsg = (HGCMMsgCore )hgcmObjReference (hMsg, HGCMOBJ_MSG);
734
735	if (!pMsg)
736	{
737	rc = VERR_INVALID_HANDLE;
738	}
739	else
740	{
741	rc = pMsg->Thread()->MsgPost (pMsg, pfnCallback, fWait);
742
743	hgcmObjDereference (pMsg);
744	}
745
746	LogFlow(("MAIN::hgcmMsgPostInternal: hMsg 0x%08X, rc = %Rrc\n", hMsg, rc));
747
748	return rc;
749	}
750
751
752	/* Post message to worker thread with a flag indication if this is a Send or Post.
753	*
754	* @thread any
755	*/
756
757	int hgcmMsgPost (HGCMMSGHANDLE hMsg, PHGCMMSGCALLBACK pfnCallback)
758	{
759	int rc = hgcmMsgPostInternal (hMsg, pfnCallback, false);
760
761	if (RT_SUCCESS(rc))
762	{
763	rc = VINF_HGCM_ASYNC_EXECUTE;
764	}
765
766	return rc;
767	}
768
769	/* Send message to worker thread. Sending thread will block until message is processed.
770	*
771	* @thread any
772	*/
773
774	int hgcmMsgSend (HGCMMSGHANDLE hMsg)
775	{
776	return hgcmMsgPostInternal (hMsg, NULL, true);
777	}
778
779
780	int hgcmMsgGet (HGCMTHREADHANDLE hThread, HGCMMsgCore **ppMsg)
781	{
782	LogFlow(("MAIN::hgcmMsgGet: hThread = 0x%08X, ppMsg = %p\n", hThread, ppMsg));
783
784	if (!hThread \|\| !ppMsg)
785	{
786	return VERR_INVALID_PARAMETER;
787	}
788
789	int rc = VINF_SUCCESS;
790
791	HGCMThread pThread = (HGCMThread )hgcmObjReference (hThread, HGCMOBJ_THREAD);
792
793	if (!pThread)
794	{
795	rc = VERR_INVALID_HANDLE;
796	}
797	else
798	{
799	rc = pThread->MsgGet (ppMsg);
800
801	hgcmObjDereference (pThread);
802	}
803
804	LogFlow(("MAIN::hgcmMsgGet: ppMsg = %p, rc = %Rrc\n", ppMsg, rc));
805
806	return rc;
807	}
808
809
810	void hgcmMsgComplete (HGCMMsgCore *pMsg, int32_t u32Result)
811	{
812	LogFlow(("MAIN::hgcmMsgComplete: pMsg = %p\n", pMsg));
813
814	if (!pMsg)
815	{
816	return;
817	}
818
819	pMsg->Thread()->MsgComplete (pMsg, u32Result);
820
821	LogFlow(("MAIN::hgcmMsgComplete: pMsg = %p, rc = void\n", pMsg));
822
823	return;
824	}
825
826
827	int hgcmThreadInit (void)
828	{
829	int rc = VINF_SUCCESS;
830
831	LogFlow(("MAIN::hgcmThreadInit\n"));
832
833	/** @todo error processing. */
834
835	rc = hgcmObjInit ();
836
837	LogFlow(("MAIN::hgcmThreadInit: rc = %Rrc\n", rc));
838
839	return rc;
840	}
841
842	void hgcmThreadUninit (void)
843	{
844	hgcmObjUninit ();
845	}

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source: vbox/trunk/src/VBox/Main/src-client/HGCMThread.cpp@ 72098

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