NativeEventQueue.cpp@ 102157

Last change on this file since 102157 was 98297, checked in by vboxsync, 22 months ago
Main: rc -> hrc/vrc for all but testcases. Enabled scm rc checks accordingly. bugref:10223
Property svn:eol-style set to `native` Property svn:keywords set to `Author Date Id Revision`
File size: 20.0 KB

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1	/* $Id: NativeEventQueue.cpp 98297 2023-01-25 01:59:25Z vboxsync $ */
2	/** @file
3	* MS COM / XPCOM Abstraction Layer:
4	* Main event queue class declaration
5	*/
6
7	/*
8	* Copyright (C) 2006-2023 Oracle and/or its affiliates.
9	*
10	* This file is part of VirtualBox base platform packages, as
11	* available from https://www.virtualbox.org.
12	*
13	* This program is free software; you can redistribute it and/or
14	* modify it under the terms of the GNU General Public License
15	* as published by the Free Software Foundation, in version 3 of the
16	* License.
17	*
18	* This program is distributed in the hope that it will be useful, but
19	* WITHOUT ANY WARRANTY; without even the implied warranty of
20	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21	* General Public License for more details.
22	*
23	* You should have received a copy of the GNU General Public License
24	* along with this program; if not, see <https://www.gnu.org/licenses>.
25	*
26	* SPDX-License-Identifier: GPL-3.0-only
27	*/
28
29	#include "VBox/com/NativeEventQueue.h"
30
31	#include <new> /* For bad_alloc. */
32
33	#ifdef RT_OS_DARWIN
34	# include <CoreFoundation/CFRunLoop.h>
35	#endif
36
37	#if defined(VBOX_WITH_XPCOM) && !defined(RT_OS_DARWIN) && !defined(RT_OS_OS2)
38	# define USE_XPCOM_QUEUE
39	#endif
40
41	#include <iprt/err.h>
42	#include <iprt/time.h>
43	#include <iprt/thread.h>
44	#include <iprt/log.h>
45	#ifdef USE_XPCOM_QUEUE
46	# include <errno.h>
47	#endif
48
49	namespace com
50	{
51
52	// NativeEventQueue class
53	////////////////////////////////////////////////////////////////////////////////
54
55	#ifndef VBOX_WITH_XPCOM
56
57	# define CHECK_THREAD_RET(ret) \
58	do { \
59	AssertMsg(GetCurrentThreadId() == mThreadId, ("Must be on event queue thread!")); \
60	if (GetCurrentThreadId() != mThreadId) \
61	return ret; \
62	} while (0)
63
64	/** Magic LPARAM value for the WM_USER messages that we're posting.
65	* @remarks This magic value is duplicated in
66	* vboxapi/PlatformMSCOM::interruptWaitEvents(). */
67	#define EVENTQUEUE_WIN_LPARAM_MAGIC UINT32_C(0xf241b819)
68
69
70	#else // VBOX_WITH_XPCOM
71
72	# define CHECK_THREAD_RET(ret) \
73	do { \
74	if (!mEventQ) \
75	return ret; \
76	BOOL isOnCurrentThread = FALSE; \
77	mEventQ->IsOnCurrentThread(&isOnCurrentThread); \
78	AssertMsg(isOnCurrentThread, ("Must be on event queue thread!")); \
79	if (!isOnCurrentThread) \
80	return ret; \
81	} while (0)
82
83	#endif // VBOX_WITH_XPCOM
84
85	/** Pointer to the main event queue. */
86	NativeEventQueue *NativeEventQueue::sMainQueue = NULL;
87
88
89	#ifdef VBOX_WITH_XPCOM
90
91	struct MyPLEvent : public PLEvent
92	{
93	MyPLEvent(NativeEvent *e) : event(e) {}
94	NativeEvent *event;
95	};
96
97	/* static */
98	void PR_CALLBACK com::NativeEventQueue::plEventHandler(PLEvent self)
99	{
100	NativeEvent ev = ((MyPLEvent )self)->event;
101	if (ev)
102	ev->handler();
103	else
104	{
105	NativeEventQueue eq = (NativeEventQueue )self->owner;
106	Assert(eq);
107	eq->mInterrupted = true;
108	}
109	return NULL;
110	}
111
112	/* static */
113	void PR_CALLBACK com::NativeEventQueue::plEventDestructor(PLEvent *self)
114	{
115	NativeEvent ev = ((MyPLEvent )self)->event;
116	if (ev)
117	delete ev;
118	delete self;
119	}
120
121	#endif // VBOX_WITH_XPCOM
122
123	/**
124	* Constructs an event queue for the current thread.
125	*
126	* Currently, there can be only one event queue per thread, so if an event
127	* queue for the current thread already exists, this object is simply attached
128	* to the existing event queue.
129	*/
130	NativeEventQueue::NativeEventQueue()
131	{
132	#ifndef VBOX_WITH_XPCOM
133
134	mThreadId = GetCurrentThreadId();
135	// force the system to create the message queue for the current thread
136	MSG msg;
137	PeekMessage(&msg, NULL, WM_USER, WM_USER, PM_NOREMOVE);
138
139	if (!DuplicateHandle(GetCurrentProcess(),
140	GetCurrentThread(),
141	GetCurrentProcess(),
142	&mhThread,
143	0 /dwDesiredAccess/,
144	FALSE /bInheritHandle/,
145	DUPLICATE_SAME_ACCESS))
146	mhThread = INVALID_HANDLE_VALUE;
147
148	#else // VBOX_WITH_XPCOM
149
150	mEQCreated = false;
151	mInterrupted = false;
152
153	// Here we reference the global nsIEventQueueService instance and hold it
154	// until we're destroyed. This is necessary to keep NS_ShutdownXPCOM() away
155	// from calling StopAcceptingEvents() on all event queues upon destruction of
156	// nsIEventQueueService, and makes sense when, for some reason, this happens
157	// before we're able to send a NULL event to stop our event handler thread
158	// when doing unexpected cleanup caused indirectly by NS_ShutdownXPCOM()
159	// that is performing a global cleanup of everything. A good example of such
160	// situation is when NS_ShutdownXPCOM() is called while the VirtualBox component
161	// is still alive (because it is still referenced): eventually, it results in
162	// a VirtualBox::uninit() call from where it is already not possible to post
163	// NULL to the event thread (because it stopped accepting events).
164
165	nsresult hrc = NS_GetEventQueueService(getter_AddRefs(mEventQService));
166
167	if (NS_SUCCEEDED(hrc))
168	{
169	hrc = mEventQService->GetThreadEventQueue(NS_CURRENT_THREAD, getter_AddRefs(mEventQ));
170	if (hrc == NS_ERROR_NOT_AVAILABLE)
171	{
172	hrc = mEventQService->CreateThreadEventQueue();
173	if (NS_SUCCEEDED(hrc))
174	{
175	mEQCreated = true;
176	hrc = mEventQService->GetThreadEventQueue(NS_CURRENT_THREAD, getter_AddRefs(mEventQ));
177	}
178	}
179	}
180	AssertComRC(hrc);
181
182	#endif // VBOX_WITH_XPCOM
183	}
184
185	NativeEventQueue::~NativeEventQueue()
186	{
187	#ifndef VBOX_WITH_XPCOM
188	if (mhThread != INVALID_HANDLE_VALUE)
189	{
190	CloseHandle(mhThread);
191	mhThread = INVALID_HANDLE_VALUE;
192	}
193	#else // VBOX_WITH_XPCOM
194	// process all pending events before destruction
195	if (mEventQ)
196	{
197	if (mEQCreated)
198	{
199	mEventQ->StopAcceptingEvents();
200	mEventQ->ProcessPendingEvents();
201	mEventQService->DestroyThreadEventQueue();
202	}
203	mEventQ = nsnull;
204	mEventQService = nsnull;
205	}
206	#endif // VBOX_WITH_XPCOM
207	}
208
209	/**
210	* Initializes the main event queue instance.
211	* @returns VBox status code.
212	*
213	* @remarks If you're using the rest of the COM/XPCOM glue library,
214	* com::Initialize() will take care of initializing and uninitializing
215	* the NativeEventQueue class. If you don't call com::Initialize, you must
216	* make sure to call this method on the same thread that did the
217	* XPCOM initialization or we'll end up using the wrong main queue.
218	*/
219	/* static */
220	int NativeEventQueue::init()
221	{
222	Assert(sMainQueue == NULL);
223	Assert(RTThreadIsMain(RTThreadSelf()));
224
225	try
226	{
227	sMainQueue = new NativeEventQueue();
228	AssertPtr(sMainQueue);
229	#ifdef VBOX_WITH_XPCOM
230	/* Check that it actually is the main event queue, i.e. that
231	we're called on the right thread. */
232	nsCOMPtr<nsIEventQueue> q;
233	nsresult rv = NS_GetMainEventQ(getter_AddRefs(q));
234	AssertComRCReturn(rv, VERR_INVALID_POINTER);
235	Assert(q == sMainQueue->mEventQ);
236
237	/* Check that it's a native queue. */
238	PRBool fIsNative = PR_FALSE;
239	rv = sMainQueue->mEventQ->IsQueueNative(&fIsNative);
240	Assert(NS_SUCCEEDED(rv) && fIsNative);
241	#endif // VBOX_WITH_XPCOM
242	}
243	catch (std::bad_alloc &ba)
244	{
245	NOREF(ba);
246	return VERR_NO_MEMORY;
247	}
248
249	return VINF_SUCCESS;
250	}
251
252	/**
253	* Uninitialize the global resources (i.e. the main event queue instance).
254	* @returns VINF_SUCCESS
255	*/
256	/* static */
257	int NativeEventQueue::uninit()
258	{
259	if (sMainQueue)
260	{
261	/* Must process all events to make sure that no NULL event is left
262	* after this point. It would need to modify the state of sMainQueue. */
263	#ifdef RT_OS_DARWIN /* Do not process the native runloop, the toolkit may not be ready for it. */
264	sMainQueue->mEventQ->ProcessPendingEvents();
265	#else
266	sMainQueue->processEventQueue(0);
267	#endif
268	delete sMainQueue;
269	sMainQueue = NULL;
270	}
271	return VINF_SUCCESS;
272	}
273
274	/**
275	* Get main event queue instance.
276	*
277	* Depends on init() being called first.
278	*/
279	/* static */
280	NativeEventQueue* NativeEventQueue::getMainEventQueue()
281	{
282	return sMainQueue;
283	}
284
285	#ifdef VBOX_WITH_XPCOM
286	# ifdef RT_OS_DARWIN
287	/**
288	* Wait for events and process them (Darwin).
289	*
290	* @retval VINF_SUCCESS
291	* @retval VERR_TIMEOUT
292	* @retval VERR_INTERRUPTED
293	*
294	* @param cMsTimeout How long to wait, or RT_INDEFINITE_WAIT.
295	*/
296	static int waitForEventsOnDarwin(RTMSINTERVAL cMsTimeout)
297	{
298	/*
299	* Wait for the requested time, if we get a hit we do a poll to process
300	* any other pending messages.
301	*
302	* Note! About 1.0e10: According to the sources anything above 3.1556952e+9
303	* means indefinite wait and 1.0e10 is what CFRunLoopRun() uses.
304	*/
305	CFTimeInterval rdTimeout = cMsTimeout == RT_INDEFINITE_WAIT ? 1e10 : (double)cMsTimeout / 1000;
306	OSStatus orc = CFRunLoopRunInMode(kCFRunLoopDefaultMode, rdTimeout, true /returnAfterSourceHandled/);
307	if (orc == kCFRunLoopRunHandledSource)
308	{
309	OSStatus orc2 = CFRunLoopRunInMode(kCFRunLoopDefaultMode, 0.0, false /returnAfterSourceHandled/);
310	if ( orc2 == kCFRunLoopRunStopped
311	\|\| orc2 == kCFRunLoopRunFinished)
312	orc = orc2;
313	}
314	if ( orc == 0 /???/
315	\|\| orc == kCFRunLoopRunHandledSource)
316	return VINF_SUCCESS;
317	if ( orc == kCFRunLoopRunStopped
318	\|\| orc == kCFRunLoopRunFinished)
319	return VERR_INTERRUPTED;
320	AssertMsg(orc == kCFRunLoopRunTimedOut, ("Unexpected status code from CFRunLoopRunInMode: %#x", orc));
321	return VERR_TIMEOUT;
322	}
323	# else // !RT_OS_DARWIN
324
325	/**
326	* Wait for events (generic XPCOM).
327	*
328	* @retval VINF_SUCCESS
329	* @retval VERR_TIMEOUT
330	* @retval VINF_INTERRUPTED
331	* @retval VERR_INTERNAL_ERROR_4
332	*
333	* @param pQueue The queue to wait on.
334	* @param cMsTimeout How long to wait, or RT_INDEFINITE_WAIT.
335	*/
336	static int waitForEventsOnXPCOM(nsIEventQueue *pQueue, RTMSINTERVAL cMsTimeout)
337	{
338	int fd = pQueue->GetEventQueueSelectFD();
339	fd_set fdsetR;
340	FD_ZERO(&fdsetR);
341	FD_SET(fd, &fdsetR);
342
343	fd_set fdsetE = fdsetR;
344
345	struct timeval tv = {0,0};
346	struct timeval *ptv;
347	if (cMsTimeout == RT_INDEFINITE_WAIT)
348	ptv = NULL;
349	else
350	{
351	tv.tv_sec = cMsTimeout / 1000;
352	tv.tv_usec = (cMsTimeout % 1000) * 1000;
353	ptv = &tv;
354	}
355
356	int iRc = select(fd + 1, &fdsetR, NULL, &fdsetE, ptv);
357	int vrc;
358	if (iRc > 0)
359	vrc = VINF_SUCCESS;
360	else if (iRc == 0)
361	vrc = VERR_TIMEOUT;
362	else if (errno == EINTR)
363	vrc = VINF_INTERRUPTED;
364	else
365	{
366	static uint32_t s_ErrorCount = 0;
367	if (s_ErrorCount < 500)
368	{
369	LogRel(("waitForEventsOnXPCOM iRc=%d errno=%d\n", iRc, errno));
370	++s_ErrorCount;
371	}
372
373	AssertMsgFailed(("iRc=%d errno=%d\n", iRc, errno));
374	vrc = VERR_INTERNAL_ERROR_4;
375	}
376	return vrc;
377	}
378
379	# endif // !RT_OS_DARWIN
380	#endif // VBOX_WITH_XPCOM
381
382	#ifndef VBOX_WITH_XPCOM
383
384	/**
385	* Dispatch a message on Windows.
386	*
387	* This will pick out our events and handle them specially.
388	*
389	* @returns @a vrc or VERR_INTERRUPTED (WM_QUIT or NULL msg).
390	* @param pMsg The message to dispatch.
391	* @param vrc The current status code.
392	*/
393	/static/
394	int NativeEventQueue::dispatchMessageOnWindows(MSG const *pMsg, int vrc)
395	{
396	/*
397	* Check for and dispatch our events.
398	*/
399	if ( pMsg->hwnd == NULL
400	&& pMsg->message == WM_USER)
401	{
402	if (pMsg->lParam == EVENTQUEUE_WIN_LPARAM_MAGIC)
403	{
404	NativeEvent pEvent = (NativeEvent )pMsg->wParam;
405	if (pEvent)
406	{
407	pEvent->handler();
408	delete pEvent;
409	}
410	else
411	vrc = VERR_INTERRUPTED;
412	return vrc;
413	}
414	AssertMsgFailed(("lParam=%p wParam=%p\n", pMsg->lParam, pMsg->wParam));
415	}
416
417	/*
418	* Check for the quit message and dispatch the message the normal way.
419	*/
420	if (pMsg->message == WM_QUIT)
421	vrc = VERR_INTERRUPTED;
422	TranslateMessage(pMsg);
423	DispatchMessage(pMsg);
424
425	return vrc;
426	}
427
428
429	/**
430	* Process pending events (Windows).
431	*
432	* @retval VINF_SUCCESS
433	* @retval VERR_TIMEOUT
434	* @retval VERR_INTERRUPTED.
435	*/
436	static int processPendingEvents(void)
437	{
438	int vrc = VERR_TIMEOUT;
439	MSG Msg;
440	if (PeekMessage(&Msg, NULL /hWnd/, 0 /wMsgFilterMin/, 0 /wMsgFilterMax/, PM_REMOVE))
441	{
442	vrc = VINF_SUCCESS;
443	do
444	vrc = NativeEventQueue::dispatchMessageOnWindows(&Msg, vrc);
445	while (PeekMessage(&Msg, NULL /hWnd/, 0 /wMsgFilterMin/, 0 /wMsgFilterMax/, PM_REMOVE));
446	}
447	return vrc;
448	}
449
450	#else // VBOX_WITH_XPCOM
451
452	/**
453	* Process pending XPCOM events.
454	* @param pQueue The queue to process events on.
455	* @retval VINF_SUCCESS
456	* @retval VERR_TIMEOUT
457	* @retval VERR_INTERRUPTED (darwin only)
458	* @retval VERR_INTERNAL_ERROR_2
459	*/
460	static int processPendingEvents(nsIEventQueue *pQueue)
461	{
462	/* ProcessPendingEvents doesn't report back what it did, so check here. */
463	PRBool fHasEvents = PR_FALSE;
464	nsresult hrc = pQueue->PendingEvents(&fHasEvents);
465	if (NS_FAILED(hrc))
466	return VERR_INTERNAL_ERROR_2;
467
468	/* Process pending events. */
469	int vrc = VINF_SUCCESS;
470	if (fHasEvents)
471	pQueue->ProcessPendingEvents();
472	else
473	vrc = VERR_TIMEOUT;
474
475	# ifdef RT_OS_DARWIN
476	/* Process pending native events. */
477	int vrc2 = waitForEventsOnDarwin(0);
478	if (vrc == VERR_TIMEOUT \|\| vrc2 == VERR_INTERRUPTED)
479	vrc = vrc2;
480	# endif
481
482	return vrc;
483	}
484
485	#endif // VBOX_WITH_XPCOM
486
487	/**
488	* Process events pending on this event queue, and wait up to given timeout, if
489	* nothing is available.
490	*
491	* Must be called on same thread this event queue was created on.
492	*
493	* @param cMsTimeout The timeout specified as milliseconds. Use
494	* RT_INDEFINITE_WAIT to wait till an event is posted on the
495	* queue.
496	*
497	* @returns VBox status code
498	* @retval VINF_SUCCESS if one or more messages was processed.
499	* @retval VERR_TIMEOUT if cMsTimeout expired.
500	* @retval VERR_INVALID_CONTEXT if called on the wrong thread.
501	* @retval VERR_INTERRUPTED if interruptEventQueueProcessing was called.
502	* On Windows will also be returned when WM_QUIT is encountered.
503	* On Darwin this may also be returned when the native queue is
504	* stopped or destroyed/finished.
505	* @retval VINF_INTERRUPTED if the native system call was interrupted by a
506	* an asynchronous event delivery (signal) or just felt like returning
507	* out of bounds. On darwin it will also be returned if the queue is
508	* stopped.
509	*
510	* @note On darwin this function will not return when the thread receives a
511	* signal, it will just resume the wait.
512	*/
513	int NativeEventQueue::processEventQueue(RTMSINTERVAL cMsTimeout)
514	{
515	int vrc;
516	CHECK_THREAD_RET(VERR_INVALID_CONTEXT);
517
518	#ifdef VBOX_WITH_XPCOM
519	/*
520	* Process pending events, if none are available and we're not in a
521	* poll call, wait for some to appear. (We have to be a little bit
522	* careful after waiting for the events since Darwin will process
523	* them as part of the wait, while the XPCOM case will not.)
524	*
525	* Note! Unfortunately, WaitForEvent isn't interruptible with Ctrl-C,
526	* while select() is. So we cannot use it for indefinite waits.
527	*/
528	vrc = processPendingEvents(mEventQ);
529	if ( vrc == VERR_TIMEOUT
530	&& cMsTimeout > 0)
531	{
532	# ifdef RT_OS_DARWIN
533	/** @todo check how Ctrl-C works on Darwin.
534	* Update: It doesn't work. MACH_RCV_INTERRUPT could perhaps be returned
535	* to __CFRunLoopServiceMachPort, but neither it nor __CFRunLoopRun
536	* has any way of expressing it via their return values. So, if
537	* Ctrl-C handling is important, signal needs to be handled on
538	* a different thread or something. */
539	vrc = waitForEventsOnDarwin(cMsTimeout);
540	# else // !RT_OS_DARWIN
541	vrc = waitForEventsOnXPCOM(mEventQ, cMsTimeout);
542	# endif // !RT_OS_DARWIN
543	if ( RT_SUCCESS(vrc)
544	\|\| vrc == VERR_TIMEOUT)
545	{
546	int vrc2 = processPendingEvents(mEventQ);
547	/* If the wait was successful don't fail the whole operation. */
548	if (RT_FAILURE(vrc) && RT_FAILURE(vrc2))
549	vrc = vrc2;
550	}
551	}
552
553	if ( ( RT_SUCCESS(vrc)
554	\|\| vrc == VERR_INTERRUPTED
555	\|\| vrc == VERR_TIMEOUT)
556	&& mInterrupted)
557	{
558	mInterrupted = false;
559	vrc = VERR_INTERRUPTED;
560	}
561
562	#else // !VBOX_WITH_XPCOM
563	if (cMsTimeout == RT_INDEFINITE_WAIT)
564	{
565	BOOL fRet = 0; /* Shut up MSC */
566	MSG Msg;
567	vrc = VINF_SUCCESS;
568	while ( vrc != VERR_INTERRUPTED
569	&& (fRet = GetMessage(&Msg, NULL /hWnd/, WM_USER, WM_USER))
570	&& fRet != -1)
571	vrc = NativeEventQueue::dispatchMessageOnWindows(&Msg, vrc);
572	if (fRet == 0)
573	vrc = VERR_INTERRUPTED;
574	else if (fRet == -1)
575	vrc = RTErrConvertFromWin32(GetLastError());
576	}
577	else
578	{
579	vrc = processPendingEvents();
580	if ( vrc == VERR_TIMEOUT
581	&& cMsTimeout != 0)
582	{
583	DWORD rcW = MsgWaitForMultipleObjects(1,
584	&mhThread,
585	TRUE /fWaitAll/,
586	cMsTimeout,
587	QS_ALLINPUT);
588	AssertMsgReturn(rcW == WAIT_TIMEOUT \|\| rcW == WAIT_OBJECT_0,
589	("%d\n", rcW),
590	VERR_INTERNAL_ERROR_4);
591	vrc = processPendingEvents();
592	}
593	}
594	#endif // !VBOX_WITH_XPCOM
595
596	Assert(vrc != VERR_TIMEOUT \|\| cMsTimeout != RT_INDEFINITE_WAIT);
597	return vrc;
598	}
599
600	/**
601	* Interrupt thread waiting on event queue processing.
602	*
603	* Can be called on any thread.
604	*
605	* @returns VBox status code.
606	*/
607	int NativeEventQueue::interruptEventQueueProcessing()
608	{
609	/* Send a NULL event. This event will be picked up and handled specially
610	* both for XPCOM and Windows. It is the responsibility of the caller to
611	* take care of not running the loop again in a way which will hang. */
612	postEvent(NULL);
613	return VINF_SUCCESS;
614	}
615
616	/**
617	* Posts an event to this event loop asynchronously.
618	*
619	* @param pEvent the event to post, must be allocated using \|new\|
620	* @return @c TRUE if successful and false otherwise
621	*/
622	BOOL NativeEventQueue::postEvent(NativeEvent *pEvent)
623	{
624	#ifndef VBOX_WITH_XPCOM
625	/* Note! The event == NULL case is duplicated in vboxapi/PlatformMSCOM::interruptWaitEvents(). */
626	BOOL fRc = PostThreadMessage(mThreadId, WM_USER, (WPARAM)pEvent, EVENTQUEUE_WIN_LPARAM_MAGIC);
627	if (!fRc)
628	{
629	static int s_cBitchedAboutFullNativeEventQueue = 0;
630	if ( GetLastError() == ERROR_NOT_ENOUGH_QUOTA
631	&& s_cBitchedAboutFullNativeEventQueue < 10)
632	LogRel(("Warning: Asynchronous event queue (%p, thread %RI32) full, event (%p) not delivered (%d/10)\n",
633	this, mThreadId, pEvent, ++s_cBitchedAboutFullNativeEventQueue));
634	else
635	AssertFailed();
636	}
637	return fRc;
638	#else // VBOX_WITH_XPCOM
639	if (!mEventQ)
640	return FALSE;
641
642	try
643	{
644	MyPLEvent *pMyEvent = new MyPLEvent(pEvent);
645	mEventQ->InitEvent(pMyEvent, this, com::NativeEventQueue::plEventHandler,
646	com::NativeEventQueue::plEventDestructor);
647	HRESULT hrc = mEventQ->PostEvent(pMyEvent);
648	return NS_SUCCEEDED(hrc);
649	}
650	catch (std::bad_alloc &ba)
651	{
652	AssertMsgFailed(("Out of memory while allocating memory for event=%p: %s\n",
653	pEvent, ba.what()));
654	}
655
656	return FALSE;
657	#endif // VBOX_WITH_XPCOM
658	}
659
660	/**
661	* Get select()'able selector for this event queue.
662	* This will return -1 on platforms and queue variants not supporting such
663	* functionality.
664	*/
665	int NativeEventQueue::getSelectFD()
666	{
667	#ifdef VBOX_WITH_XPCOM
668	return mEventQ->GetEventQueueSelectFD();
669	#else
670	return -1;
671	#endif
672	}
673
674	}
675	/* namespace com */

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source: vbox/trunk/src/VBox/Main/glue/NativeEventQueue.cpp@ 102157

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