VirtualBoxBase.cpp@ 25837

Last change on this file since 25837 was 25834, checked in by vboxsync, 15 years ago
Main: finish integration of Main lock validation with IPRT; only enabled with VBOX_WITH_STRICT_LOCKS=1 (do NOT enable unless you want Main to stop working now)
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File size: 35.6 KB

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1	/* $Id: VirtualBoxBase.cpp 25834 2010-01-14 16:21:05Z vboxsync $ */
2
3	/** @file
4	*
5	* VirtualBox COM base classes implementation
6	*/
7
8	/*
9	* Copyright (C) 2006-2009 Sun Microsystems, Inc.
10	*
11	* This file is part of VirtualBox Open Source Edition (OSE), as
12	* available from http://www.virtualbox.org. This file is free software;
13	* you can redistribute it and/or modify it under the terms of the GNU
14	* General Public License (GPL) as published by the Free Software
15	* Foundation, in version 2 as it comes in the "COPYING" file of the
16	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
17	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
18	*
19	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
20	* Clara, CA 95054 USA or visit http://www.sun.com if you need
21	* additional information or have any questions.
22	*/
23
24	#include <iprt/semaphore.h>
25	#include <iprt/asm.h>
26
27	#if !defined (VBOX_WITH_XPCOM)
28	#include <windows.h>
29	#include <dbghelp.h>
30	#else /* !defined (VBOX_WITH_XPCOM) */
31	/// @todo remove when VirtualBoxErrorInfo goes away from here
32	#include <nsIServiceManager.h>
33	#include <nsIExceptionService.h>
34	#endif /* !defined (VBOX_WITH_XPCOM) */
35
36	#include "VirtualBoxBase.h"
37	#include "VirtualBoxErrorInfoImpl.h"
38	#include "Logging.h"
39
40	#include "objectslist.h"
41
42	////////////////////////////////////////////////////////////////////////////////
43	//
44	// VirtualBoxBaseProto
45	//
46	////////////////////////////////////////////////////////////////////////////////
47
48	VirtualBoxBaseProto::VirtualBoxBaseProto()
49	: mStateLock(LOCKCLASS_OBJECTSTATE)
50	{
51	mState = NotReady;
52	mStateChangeThread = NIL_RTTHREAD;
53	mCallers = 0;
54	mZeroCallersSem = NIL_RTSEMEVENT;
55	mInitUninitSem = NIL_RTSEMEVENTMULTI;
56	mInitUninitWaiters = 0;
57	mObjectLock = NULL;
58	}
59
60	VirtualBoxBaseProto::~VirtualBoxBaseProto()
61	{
62	if (mObjectLock)
63	delete mObjectLock;
64	Assert (mInitUninitWaiters == 0);
65	Assert (mInitUninitSem == NIL_RTSEMEVENTMULTI);
66	if (mZeroCallersSem != NIL_RTSEMEVENT)
67	RTSemEventDestroy (mZeroCallersSem);
68	mCallers = 0;
69	mStateChangeThread = NIL_RTTHREAD;
70	mState = NotReady;
71	}
72
73	// util::Lockable interface
74
75	RWLockHandle *VirtualBoxBaseProto::lockHandle() const
76	{
77	/* lazy initialization */
78	if (RT_UNLIKELY(!mObjectLock))
79	{
80	AssertCompile (sizeof (RWLockHandle ) == sizeof (void ));
81
82	// locking class is LOCKCLASS_VIRTUALBOXOBJECT for the VirtualBox singleton,
83	// LOCKCLASS_HOSTOBJECT for the Host object and LOCKCLASS_OBJECT for any other object
84	RWLockHandle *objLock = new RWLockHandle(getLockingClass());
85	if (!ASMAtomicCmpXchgPtr ((void * volatile *) &mObjectLock, objLock, NULL))
86	{
87	delete objLock;
88	objLock = (RWLockHandle ) ASMAtomicReadPtr ((void volatile *) &mObjectLock);
89	}
90	return objLock;
91	}
92	return mObjectLock;
93	}
94
95	/**
96	* Increments the number of calls to this object by one.
97	*
98	* After this method succeeds, it is guaranted that the object will remain
99	* in the Ready (or in the Limited) state at least until #releaseCaller() is
100	* called.
101	*
102	* This method is intended to mark the beginning of sections of code within
103	* methods of COM objects that depend on the readiness (Ready) state. The
104	* Ready state is a primary "ready to serve" state. Usually all code that
105	* works with component's data depends on it. On practice, this means that
106	* almost every public method, setter or getter of the object should add
107	* itself as an object's caller at the very beginning, to protect from an
108	* unexpected uninitialization that may happen on a different thread.
109	*
110	* Besides the Ready state denoting that the object is fully functional,
111	* there is a special Limited state. The Limited state means that the object
112	* is still functional, but its functionality is limited to some degree, so
113	* not all operations are possible. The @a aLimited argument to this method
114	* determines whether the caller represents this limited functionality or
115	* not.
116	*
117	* This method succeeeds (and increments the number of callers) only if the
118	* current object's state is Ready. Otherwise, it will return E_ACCESSDENIED
119	* to indicate that the object is not operational. There are two exceptions
120	* from this rule:
121	* <ol>
122	* <li>If the @a aLimited argument is \|true\|, then this method will also
123	* succeeed if the object's state is Limited (or Ready, of course).
124	* </li>
125	* <li>If this method is called from the same thread that placed
126	* the object to InInit or InUninit state (i.e. either from within the
127	* AutoInitSpan or AutoUninitSpan scope), it will succeed as well (but
128	* will not increase the number of callers).
129	* </li>
130	* </ol>
131	*
132	* Normally, calling addCaller() never blocks. However, if this method is
133	* called by a thread created from within the AutoInitSpan scope and this
134	* scope is still active (i.e. the object state is InInit), it will block
135	* until the AutoInitSpan destructor signals that it has finished
136	* initialization.
137	*
138	* Also, addCaller() will block if the object is probing uninitialization on
139	* another thread with AutoMayUninitSpan (i.e. the object state is MayUninit).
140	* And again, the block will last until the AutoMayUninitSpan destructor signals
141	* that it has finished probing and the object is either ready again or will
142	* uninitialize shortly (so that addCaller() will fail).
143	*
144	* When this method returns a failure, the caller must not use the object
145	* and should return the failed result code to its own caller.
146	*
147	* @param aState Where to store the current object's state (can be
148	* used in overriden methods to determine the cause of
149	* the failure).
150	* @param aLimited \|true\| to add a limited caller.
151	*
152	* @return S_OK on success or E_ACCESSDENIED on failure.
153	*
154	* @note It is preferrable to use the #addLimitedCaller() rather than
155	* calling this method with @a aLimited = \|true\|, for better
156	* self-descriptiveness.
157	*
158	* @sa #addLimitedCaller()
159	* @sa #releaseCaller()
160	*/
161	HRESULT VirtualBoxBaseProto::addCaller (State aState / = NULL */,
162	bool aLimited /* = false */)
163	{
164	AutoWriteLock stateLock(mStateLock COMMA_LOCKVAL_SRC_POS);
165
166	HRESULT rc = E_ACCESSDENIED;
167
168	if (mState == Ready \|\| (aLimited && mState == Limited))
169	{
170	/* if Ready or allows Limited, increase the number of callers */
171	++ mCallers;
172	rc = S_OK;
173	}
174	else
175	if (mState == InInit \|\| mState == MayUninit \|\| mState == InUninit)
176	{
177	if (mStateChangeThread == RTThreadSelf())
178	{
179	/* Called from the same thread that is doing AutoInitSpan or
180	* AutoUninitSpan or AutoMayUninitSpan, just succeed */
181	rc = S_OK;
182	}
183	else if (mState == InInit \|\| mState == MayUninit)
184	{
185	/* One of the two:
186	*
187	* 1) addCaller() is called by a "child" thread while the "parent"
188	* thread is still doing AutoInitSpan/AutoReinitSpan, so wait for
189	* the state to become either Ready/Limited or InitFailed (in
190	* case of init failure).
191	*
192	* 2) addCaller() is called while another thread is in
193	* AutoMayUninitSpan, so wait for the state to become either
194	* Ready or WillUninit.
195	*
196	* Note that in either case we increase the number of callers anyway
197	* -- to prevent AutoUninitSpan from early completion if we are
198	* still not scheduled to pick up the posted semaphore when uninit()
199	* is called.
200	*/
201	++ mCallers;
202
203	/* lazy semaphore creation */
204	if (mInitUninitSem == NIL_RTSEMEVENTMULTI)
205	{
206	RTSemEventMultiCreate (&mInitUninitSem);
207	Assert (mInitUninitWaiters == 0);
208	}
209
210	++ mInitUninitWaiters;
211
212	LogFlowThisFunc((mState == InInit ?
213	"Waiting for AutoInitSpan/AutoReinitSpan to "
214	"finish...\n" :
215	"Waiting for AutoMayUninitSpan to finish...\n"));
216
217	stateLock.leave();
218	RTSemEventMultiWait (mInitUninitSem, RT_INDEFINITE_WAIT);
219	stateLock.enter();
220
221	if (-- mInitUninitWaiters == 0)
222	{
223	/* destroy the semaphore since no more necessary */
224	RTSemEventMultiDestroy (mInitUninitSem);
225	mInitUninitSem = NIL_RTSEMEVENTMULTI;
226	}
227
228	if (mState == Ready \|\| (aLimited && mState == Limited))
229	rc = S_OK;
230	else
231	{
232	Assert (mCallers != 0);
233	-- mCallers;
234	if (mCallers == 0 && mState == InUninit)
235	{
236	/* inform AutoUninitSpan ctor there are no more callers */
237	RTSemEventSignal (mZeroCallersSem);
238	}
239	}
240	}
241	}
242
243	if (aState)
244	*aState = mState;
245
246	return rc;
247	}
248
249	/**
250	* Decreases the number of calls to this object by one.
251	*
252	* Must be called after every #addCaller() or #addLimitedCaller() when
253	* protecting the object from uninitialization is no more necessary.
254	*/
255	void VirtualBoxBaseProto::releaseCaller()
256	{
257	AutoWriteLock stateLock(mStateLock COMMA_LOCKVAL_SRC_POS);
258
259	if (mState == Ready \|\| mState == Limited)
260	{
261	/* if Ready or Limited, decrease the number of callers */
262	AssertMsgReturn (mCallers != 0, ("mCallers is ZERO!"), (void) 0);
263	-- mCallers;
264
265	return;
266	}
267
268	if (mState == InInit \|\| mState == MayUninit \|\| mState == InUninit)
269	{
270	if (mStateChangeThread == RTThreadSelf())
271	{
272	/* Called from the same thread that is doing AutoInitSpan,
273	* AutoMayUninitSpan or AutoUninitSpan: just succeed */
274	return;
275	}
276
277	if (mState == MayUninit \|\| mState == InUninit)
278	{
279	/* the caller is being released after AutoUninitSpan or
280	* AutoMayUninitSpan has begun */
281	AssertMsgReturn (mCallers != 0, ("mCallers is ZERO!"), (void) 0);
282	-- mCallers;
283
284	if (mCallers == 0)
285	{
286	/* inform the AutoUninitSpan ctor there are no more callers /
287	RTSemEventSignal (mZeroCallersSem);
288	}
289
290	return;
291	}
292	}
293
294	AssertMsgFailed (("mState = %d!", mState));
295	}
296
297	////////////////////////////////////////////////////////////////////////////////
298	//
299	// VirtualBoxBaseProto::AutoInitSpan methods
300	//
301	////////////////////////////////////////////////////////////////////////////////
302
303	/**
304	* Creates a smart initialization span object that places the object to
305	* InInit state.
306	*
307	* Please see the AutoInitSpan class description for more info.
308	*
309	* @param aObj \|this\| pointer of the managed VirtualBoxBase object whose
310	* init() method is being called.
311	* @param aResult Default initialization result.
312	*/
313	VirtualBoxBaseProto::AutoInitSpan::
314	AutoInitSpan (VirtualBoxBaseProto aObj, Result aResult / = Failed */)
315	: mObj (aObj), mResult (aResult), mOk (false)
316	{
317	Assert (aObj);
318
319	AutoWriteLock stateLock(mObj->mStateLock COMMA_LOCKVAL_SRC_POS);
320
321	mOk = mObj->mState == NotReady;
322	AssertReturnVoid (mOk);
323
324	mObj->setState (InInit);
325	}
326
327	/**
328	* Places the managed VirtualBoxBase object to Ready/Limited state if the
329	* initialization succeeded or partly succeeded, or places it to InitFailed
330	* state and calls the object's uninit() method.
331	*
332	* Please see the AutoInitSpan class description for more info.
333	*/
334	VirtualBoxBaseProto::AutoInitSpan::~AutoInitSpan()
335	{
336	/* if the state was other than NotReady, do nothing */
337	if (!mOk)
338	return;
339
340	AutoWriteLock stateLock(mObj->mStateLock COMMA_LOCKVAL_SRC_POS);
341
342	Assert (mObj->mState == InInit);
343
344	if (mObj->mCallers > 0)
345	{
346	Assert (mObj->mInitUninitWaiters > 0);
347
348	/* We have some pending addCaller() calls on other threads (created
349	* during InInit), signal that InInit is finished and they may go on. */
350	RTSemEventMultiSignal (mObj->mInitUninitSem);
351	}
352
353	if (mResult == Succeeded)
354	{
355	mObj->setState (Ready);
356	}
357	else
358	if (mResult == Limited)
359	{
360	mObj->setState (VirtualBoxBaseProto::Limited);
361	}
362	else
363	{
364	mObj->setState (InitFailed);
365	/* leave the lock to prevent nesting when uninit() is called */
366	stateLock.leave();
367	/* call uninit() to let the object uninit itself after failed init() */
368	mObj->uninit();
369	/* Note: the object may no longer exist here (for example, it can call
370	* the destructor in uninit()) */
371	}
372	}
373
374	// VirtualBoxBaseProto::AutoReinitSpan methods
375	////////////////////////////////////////////////////////////////////////////////
376
377	/**
378	* Creates a smart re-initialization span object and places the object to
379	* InInit state.
380	*
381	* Please see the AutoInitSpan class description for more info.
382	*
383	* @param aObj \|this\| pointer of the managed VirtualBoxBase object whose
384	* re-initialization method is being called.
385	*/
386	VirtualBoxBaseProto::AutoReinitSpan::
387	AutoReinitSpan (VirtualBoxBaseProto *aObj)
388	: mObj (aObj), mSucceeded (false), mOk (false)
389	{
390	Assert (aObj);
391
392	AutoWriteLock stateLock(mObj->mStateLock COMMA_LOCKVAL_SRC_POS);
393
394	mOk = mObj->mState == Limited;
395	AssertReturnVoid (mOk);
396
397	mObj->setState (InInit);
398	}
399
400	/**
401	* Places the managed VirtualBoxBase object to Ready state if the
402	* re-initialization succeeded (i.e. #setSucceeded() has been called) or back to
403	* Limited state otherwise.
404	*
405	* Please see the AutoInitSpan class description for more info.
406	*/
407	VirtualBoxBaseProto::AutoReinitSpan::~AutoReinitSpan()
408	{
409	/* if the state was other than Limited, do nothing */
410	if (!mOk)
411	return;
412
413	AutoWriteLock stateLock(mObj->mStateLock COMMA_LOCKVAL_SRC_POS);
414
415	Assert (mObj->mState == InInit);
416
417	if (mObj->mCallers > 0 && mObj->mInitUninitWaiters > 0)
418	{
419	/* We have some pending addCaller() calls on other threads (created
420	* during InInit), signal that InInit is finished and they may go on. */
421	RTSemEventMultiSignal (mObj->mInitUninitSem);
422	}
423
424	if (mSucceeded)
425	{
426	mObj->setState (Ready);
427	}
428	else
429	{
430	mObj->setState (Limited);
431	}
432	}
433
434	// VirtualBoxBaseProto::AutoUninitSpan methods
435	////////////////////////////////////////////////////////////////////////////////
436
437	/**
438	* Creates a smart uninitialization span object and places this object to
439	* InUninit state.
440	*
441	* Please see the AutoInitSpan class description for more info.
442	*
443	* @note This method blocks the current thread execution until the number of
444	* callers of the managed VirtualBoxBase object drops to zero!
445	*
446	* @param aObj \|this\| pointer of the VirtualBoxBase object whose uninit()
447	* method is being called.
448	*/
449	VirtualBoxBaseProto::AutoUninitSpan::AutoUninitSpan (VirtualBoxBaseProto *aObj)
450	: mObj (aObj), mInitFailed (false), mUninitDone (false)
451	{
452	Assert (aObj);
453
454	AutoWriteLock stateLock(mObj->mStateLock COMMA_LOCKVAL_SRC_POS);
455
456	Assert (mObj->mState != InInit);
457
458	/* Set mUninitDone to \|true\| if this object is already uninitialized
459	* (NotReady) or if another AutoUninitSpan is currently active on some
460	* other thread (InUninit). */
461	mUninitDone = mObj->mState == NotReady \|\|
462	mObj->mState == InUninit;
463
464	if (mObj->mState == InitFailed)
465	{
466	/* we've been called by init() on failure */
467	mInitFailed = true;
468	}
469	else
470	{
471	if (mUninitDone)
472	{
473	/* do nothing if already uninitialized */
474	if (mObj->mState == NotReady)
475	return;
476
477	/* otherwise, wait until another thread finishes uninitialization.
478	* This is necessary to make sure that when this method returns, the
479	* object is NotReady and therefore can be deleted (for example).
480	* In particular, this is used by
481	* VirtualBoxBaseWithTypedChildrenNEXT::uninitDependentChildren(). */
482
483	/* lazy semaphore creation */
484	if (mObj->mInitUninitSem == NIL_RTSEMEVENTMULTI)
485	{
486	RTSemEventMultiCreate (&mObj->mInitUninitSem);
487	Assert (mObj->mInitUninitWaiters == 0);
488	}
489	++ mObj->mInitUninitWaiters;
490
491	LogFlowFunc (("{%p}: Waiting for AutoUninitSpan to finish...\n",
492	mObj));
493
494	stateLock.leave();
495	RTSemEventMultiWait (mObj->mInitUninitSem, RT_INDEFINITE_WAIT);
496	stateLock.enter();
497
498	if (-- mObj->mInitUninitWaiters == 0)
499	{
500	/* destroy the semaphore since no more necessary */
501	RTSemEventMultiDestroy (mObj->mInitUninitSem);
502	mObj->mInitUninitSem = NIL_RTSEMEVENTMULTI;
503	}
504
505	return;
506	}
507	}
508
509	/* go to InUninit to prevent from adding new callers */
510	mObj->setState (InUninit);
511
512	/* wait for already existing callers to drop to zero */
513	if (mObj->mCallers > 0)
514	{
515	/* lazy creation */
516	Assert (mObj->mZeroCallersSem == NIL_RTSEMEVENT);
517	RTSemEventCreate (&mObj->mZeroCallersSem);
518
519	/* wait until remaining callers release the object */
520	LogFlowFunc (("{%p}: Waiting for callers (%d) to drop to zero...\n",
521	mObj, mObj->mCallers));
522
523	stateLock.leave();
524	RTSemEventWait (mObj->mZeroCallersSem, RT_INDEFINITE_WAIT);
525	}
526	}
527
528	/**
529	* Places the managed VirtualBoxBase object to the NotReady state.
530	*/
531	VirtualBoxBaseProto::AutoUninitSpan::~AutoUninitSpan()
532	{
533	/* do nothing if already uninitialized */
534	if (mUninitDone)
535	return;
536
537	AutoWriteLock stateLock(mObj->mStateLock COMMA_LOCKVAL_SRC_POS);
538
539	Assert (mObj->mState == InUninit);
540
541	mObj->setState (NotReady);
542	}
543
544	// VirtualBoxBaseProto::AutoMayUninitSpan methods
545	////////////////////////////////////////////////////////////////////////////////
546
547	/**
548	* Creates a smart initialization span object that places the object to
549	* MayUninit state.
550	*
551	* Please see the AutoMayUninitSpan class description for more info.
552	*
553	* @param aObj \|this\| pointer of the managed VirtualBoxBase object whose
554	* uninit() method to be probably called.
555	*/
556	VirtualBoxBaseProto::AutoMayUninitSpan::
557	AutoMayUninitSpan (VirtualBoxBaseProto *aObj)
558	: mObj (aObj), mRC (E_FAIL), mAlreadyInProgress (false)
559	, mAcceptUninit (false)
560	{
561	Assert (aObj);
562
563	AutoWriteLock stateLock(mObj->mStateLock COMMA_LOCKVAL_SRC_POS);
564
565	AssertReturnVoid (mObj->mState != InInit &&
566	mObj->mState != InUninit);
567
568	switch (mObj->mState)
569	{
570	case Ready:
571	break;
572	case MayUninit:
573	/* Nothing to be done if already in MayUninit. */
574	mAlreadyInProgress = true;
575	mRC = S_OK;
576	return;
577	default:
578	/* Abuse mObj->addCaller() to get the extended error info possibly
579	* set by reimplementations of addCaller() and return it to the
580	* caller. Note that this abuse is supposed to be safe because we
581	* should've filtered out all states where addCaller() would do
582	* something else but set error info. */
583	mRC = mObj->addCaller();
584	Assert (FAILED (mRC));
585	return;
586	}
587
588	/* go to MayUninit to cause new callers to wait until we finish */
589	mObj->setState (MayUninit);
590	mRC = S_OK;
591
592	/* wait for already existing callers to drop to zero */
593	if (mObj->mCallers > 0)
594	{
595	/* lazy creation */
596	Assert (mObj->mZeroCallersSem == NIL_RTSEMEVENT);
597	RTSemEventCreate (&mObj->mZeroCallersSem);
598
599	/* wait until remaining callers release the object */
600	LogFlowFunc (("{%p}: Waiting for callers (%d) to drop to zero...\n",
601	mObj, mObj->mCallers));
602
603	stateLock.leave();
604	RTSemEventWait (mObj->mZeroCallersSem, RT_INDEFINITE_WAIT);
605	}
606	}
607
608	/**
609	* Places the managed VirtualBoxBase object back to Ready state if
610	* #acceptUninit() was not called, or places it to WillUninit state and calls
611	* the object's uninit() method.
612	*
613	* Please see the AutoMayUninitSpan class description for more info.
614	*/
615	VirtualBoxBaseProto::AutoMayUninitSpan::~AutoMayUninitSpan()
616	{
617	/* if we did nothing in the constructor, do nothing here */
618	if (mAlreadyInProgress \|\| FAILED (mRC))
619	return;
620
621	AutoWriteLock stateLock(mObj->mStateLock COMMA_LOCKVAL_SRC_POS);
622
623	Assert (mObj->mState == MayUninit);
624
625	if (mObj->mCallers > 0)
626	{
627	Assert (mObj->mInitUninitWaiters > 0);
628
629	/* We have some pending addCaller() calls on other threads made after
630	* going to during MayUnit, signal that MayUnit is finished and they may
631	* go on. */
632	RTSemEventMultiSignal (mObj->mInitUninitSem);
633	}
634
635	if (!mAcceptUninit)
636	{
637	mObj->setState (Ready);
638	}
639	else
640	{
641	mObj->setState (WillUninit);
642	/* leave the lock to prevent nesting when uninit() is called */
643	stateLock.leave();
644	/* call uninit() to let the object uninit itself */
645	mObj->uninit();
646	/* Note: the object may no longer exist here (for example, it can call
647	* the destructor in uninit()) */
648	}
649	}
650
651	////////////////////////////////////////////////////////////////////////////////
652	//
653	// VirtualBoxBase
654	//
655	////////////////////////////////////////////////////////////////////////////////
656
657	/**
658	* Translates the given text string according to the currently installed
659	* translation table and current context. The current context is determined
660	* by the context parameter. Additionally, a comment to the source text
661	* string text can be given. This comment (which is NULL by default)
662	* is helpful in situations where it is necessary to distinguish between
663	* two or more semantically different roles of the same source text in the
664	* same context.
665	*
666	* @param context the context of the translation (can be NULL
667	* to indicate the global context)
668	* @param sourceText the string to translate
669	* @param comment the comment to the string (NULL means no comment)
670	*
671	* @return
672	* the translated version of the source string in UTF-8 encoding,
673	* or the source string itself if the translation is not found
674	* in the given context.
675	*/
676	// static
677	const char VirtualBoxBase::translate (const char /* context /, const char sourceText,
678	const char * /* comment */)
679	{
680	#if 0
681	Log(("VirtualBoxBase::translate:\n"
682	" context={%s}\n"
683	" sourceT={%s}\n"
684	" comment={%s}\n",
685	context, sourceText, comment));
686	#endif
687
688	/// @todo (dmik) incorporate Qt translation file parsing and lookup
689	return sourceText;
690	}
691
692	////////////////////////////////////////////////////////////////////////////////
693	//
694	// VirtualBoxSupportTranslationBase
695	//
696	////////////////////////////////////////////////////////////////////////////////
697
698	/**
699	* Modifies the given argument so that it will contain only a class name
700	* (null-terminated). The argument must point to a <b>non-constant</b>
701	* string containing a valid value, as it is generated by the
702	* __PRETTY_FUNCTION__ built-in macro of the GCC compiler, or by the
703	* __FUNCTION__ macro of any other compiler.
704	*
705	* The function assumes that the macro is used within the member of the
706	* class derived from the VirtualBoxSupportTranslation<> template.
707	*
708	* @param prettyFunctionName string to modify
709	* @return
710	* true on success and false otherwise
711	*/
712	bool VirtualBoxSupportTranslationBase::cutClassNameFrom__PRETTY_FUNCTION__ (char *fn)
713	{
714	Assert (fn);
715	if (!fn)
716	return false;
717
718	#if defined (__GNUC__)
719
720	// the format is like:
721	// VirtualBoxSupportTranslation<C>::VirtualBoxSupportTranslation() [with C = VirtualBox]
722
723	#define START " = "
724	#define END "]"
725
726	#elif defined (_MSC_VER)
727
728	// the format is like:
729	// VirtualBoxSupportTranslation<class VirtualBox>::__ctor
730
731	#define START "<class "
732	#define END ">::"
733
734	#endif
735
736	char *start = strstr (fn, START);
737	Assert (start);
738	if (start)
739	{
740	start += sizeof (START) - 1;
741	char *end = strstr (start, END);
742	Assert (end && (end > start));
743	if (end && (end > start))
744	{
745	size_t len = end - start;
746	memmove (fn, start, len);
747	fn [len] = 0;
748	return true;
749	}
750	}
751
752	#undef END
753	#undef START
754
755	return false;
756	}
757
758	////////////////////////////////////////////////////////////////////////////////
759	//
760	// VirtualBoxSupportErrorInfoImplBase
761	//
762	////////////////////////////////////////////////////////////////////////////////
763
764	RTTLS VirtualBoxSupportErrorInfoImplBase::MultiResult::sCounter = NIL_RTTLS;
765
766	void VirtualBoxSupportErrorInfoImplBase::MultiResult::init()
767	{
768	if (sCounter == NIL_RTTLS)
769	{
770	sCounter = RTTlsAlloc();
771	AssertReturnVoid (sCounter != NIL_RTTLS);
772	}
773
774	uintptr_t counter = (uintptr_t) RTTlsGet (sCounter);
775	++ counter;
776	RTTlsSet (sCounter, (void *) counter);
777	}
778
779	VirtualBoxSupportErrorInfoImplBase::MultiResult::~MultiResult()
780	{
781	uintptr_t counter = (uintptr_t) RTTlsGet (sCounter);
782	AssertReturnVoid (counter != 0);
783	-- counter;
784	RTTlsSet (sCounter, (void *) counter);
785	}
786
787	/**
788	* Sets error info for the current thread. This is an internal function that
789	* gets eventually called by all public variants. If @a aWarning is
790	* @c true, then the highest (31) bit in the @a aResultCode value which
791	* indicates the error severity is reset to zero to make sure the receiver will
792	* recognize that the created error info object represents a warning rather
793	* than an error.
794	*/
795	/* static */
796	HRESULT VirtualBoxSupportErrorInfoImplBase::setErrorInternal (
797	HRESULT aResultCode, const GUID &aIID,
798	const Bstr &aComponent, const Bstr &aText,
799	bool aWarning, bool aLogIt)
800	{
801	/* whether multi-error mode is turned on */
802	bool preserve = ((uintptr_t) RTTlsGet (MultiResult::sCounter)) > 0;
803
804	if (aLogIt)
805	LogRel (("ERROR [COM]: aRC=%Rhrc (%#08x) aIID={%RTuuid} aComponent={%ls} aText={%ls} "
806	"aWarning=%RTbool, preserve=%RTbool\n",
807	aResultCode, aResultCode, &aIID, aComponent.raw(), aText.raw(), aWarning,
808	preserve));
809
810	/* these are mandatory, others -- not */
811	AssertReturn((!aWarning && FAILED (aResultCode)) \|\|
812	(aWarning && aResultCode != S_OK),
813	E_FAIL);
814	AssertReturn(!aText.isEmpty(), E_FAIL);
815
816	/* reset the error severity bit if it's a warning */
817	if (aWarning)
818	aResultCode &= ~0x80000000;
819
820	HRESULT rc = S_OK;
821
822	do
823	{
824	ComObjPtr<VirtualBoxErrorInfo> info;
825	rc = info.createObject();
826	if (FAILED(rc)) break;
827
828	#if !defined (VBOX_WITH_XPCOM)
829
830	ComPtr<IVirtualBoxErrorInfo> curInfo;
831	if (preserve)
832	{
833	/* get the current error info if any */
834	ComPtr<IErrorInfo> err;
835	rc = ::GetErrorInfo (0, err.asOutParam());
836	if (FAILED(rc)) break;
837	rc = err.queryInterfaceTo(curInfo.asOutParam());
838	if (FAILED (rc))
839	{
840	/* create a IVirtualBoxErrorInfo wrapper for the native
841	* IErrorInfo object */
842	ComObjPtr<VirtualBoxErrorInfo> wrapper;
843	rc = wrapper.createObject();
844	if (SUCCEEDED(rc))
845	{
846	rc = wrapper->init (err);
847	if (SUCCEEDED(rc))
848	curInfo = wrapper;
849	}
850	}
851	}
852	/* On failure, curInfo will stay null */
853	Assert (SUCCEEDED(rc) \|\| curInfo.isNull());
854
855	/* set the current error info and preserve the previous one if any */
856	rc = info->init (aResultCode, aIID, aComponent, aText, curInfo);
857	if (FAILED(rc)) break;
858
859	ComPtr<IErrorInfo> err;
860	rc = info.queryInterfaceTo(err.asOutParam());
861	if (SUCCEEDED(rc))
862	rc = ::SetErrorInfo (0, err);
863
864	#else // !defined (VBOX_WITH_XPCOM)
865
866	nsCOMPtr <nsIExceptionService> es;
867	es = do_GetService (NS_EXCEPTIONSERVICE_CONTRACTID, &rc);
868	if (NS_SUCCEEDED(rc))
869	{
870	nsCOMPtr <nsIExceptionManager> em;
871	rc = es->GetCurrentExceptionManager (getter_AddRefs (em));
872	if (FAILED(rc)) break;
873
874	ComPtr<IVirtualBoxErrorInfo> curInfo;
875	if (preserve)
876	{
877	/* get the current error info if any */
878	ComPtr<nsIException> ex;
879	rc = em->GetCurrentException (ex.asOutParam());
880	if (FAILED(rc)) break;
881	rc = ex.queryInterfaceTo(curInfo.asOutParam());
882	if (FAILED(rc))
883	{
884	/* create a IVirtualBoxErrorInfo wrapper for the native
885	* nsIException object */
886	ComObjPtr<VirtualBoxErrorInfo> wrapper;
887	rc = wrapper.createObject();
888	if (SUCCEEDED(rc))
889	{
890	rc = wrapper->init (ex);
891	if (SUCCEEDED(rc))
892	curInfo = wrapper;
893	}
894	}
895	}
896	/* On failure, curInfo will stay null */
897	Assert (SUCCEEDED(rc) \|\| curInfo.isNull());
898
899	/* set the current error info and preserve the previous one if any */
900	rc = info->init (aResultCode, aIID, aComponent, aText, curInfo);
901	if (FAILED(rc)) break;
902
903	ComPtr<nsIException> ex;
904	rc = info.queryInterfaceTo(ex.asOutParam());
905	if (SUCCEEDED(rc))
906	rc = em->SetCurrentException (ex);
907	}
908	else if (rc == NS_ERROR_UNEXPECTED)
909	{
910	/*
911	* It is possible that setError() is being called by the object
912	* after the XPCOM shutdown sequence has been initiated
913	* (for example, when XPCOM releases all instances it internally
914	* references, which can cause object's FinalConstruct() and then
915	* uninit()). In this case, do_GetService() above will return
916	* NS_ERROR_UNEXPECTED and it doesn't actually make sense to
917	* set the exception (nobody will be able to read it).
918	*/
919	LogWarningFunc (("Will not set an exception because "
920	"nsIExceptionService is not available "
921	"(NS_ERROR_UNEXPECTED). "
922	"XPCOM is being shutdown?\n"));
923	rc = NS_OK;
924	}
925
926	#endif // !defined (VBOX_WITH_XPCOM)
927	}
928	while (0);
929
930	AssertComRC (rc);
931
932	return SUCCEEDED(rc) ? aResultCode : rc;
933	}
934
935
936	/**
937	* Uninitializes all dependent children registered on this object with
938	* #addDependentChild().
939	*
940	* Must be called from within the VirtualBoxBaseProto::AutoUninitSpan (i.e.
941	* typically from this object's uninit() method) to uninitialize children
942	* before this object goes out of service and becomes unusable.
943	*
944	* Note that this method will call uninit() methods of child objects. If
945	* these methods need to call the parent object during uninitialization,
946	* #uninitDependentChildren() must be called before the relevant part of the
947	* parent is uninitialized: usually at the begnning of the parent
948	* uninitialization sequence.
949	*
950	* Keep in mind that the uninitialized child objects may be no longer available
951	* (i.e. may be deleted) after this method returns.
952	*
953	* @note Locks #childrenLock() for writing.
954	*
955	* @note May lock something else through the called children.
956	*/
957	void VirtualBoxBaseWithChildrenNEXT::uninitDependentChildren()
958	{
959	AutoCaller autoCaller(this);
960
961	/* sanity */
962	AssertReturnVoid (autoCaller.state() == InUninit \|\|
963	autoCaller.state() == InInit);
964
965	AutoWriteLock chLock(childrenLock() COMMA_LOCKVAL_SRC_POS);
966
967	size_t count = mDependentChildren.size();
968
969	while (count != 0)
970	{
971	/* strongly reference the weak child from the map to make sure it won't
972	* be deleted while we've released the lock */
973	DependentChildren::iterator it = mDependentChildren.begin();
974	ComPtr<IUnknown> unk = it->first;
975	Assert (!unk.isNull());
976
977	VirtualBoxBase *child = it->second;
978
979	/* release the lock to let children stuck in removeDependentChild() go
980	* on (otherwise we'll deadlock in uninit() */
981	chLock.leave();
982
983	/* Note that if child->uninit() happens to be called on another
984	* thread right before us and is not yet finished, the second
985	* uninit() call will wait until the first one has done so
986	* (thanks to AutoUninitSpan). */
987	Assert (child);
988	if (child)
989	child->uninit();
990
991	chLock.enter();
992
993	/* uninit() is guaranteed to be done here so the child must be already
994	* deleted from the list by removeDependentChild() called from there.
995	* Do some checks to avoid endless loops when the user is forgetful */
996	-- count;
997	Assert (count == mDependentChildren.size());
998	if (count != mDependentChildren.size())
999	mDependentChildren.erase (it);
1000
1001	Assert (count == mDependentChildren.size());
1002	}
1003	}
1004
1005	/**
1006	* Returns a pointer to the dependent child (registered using
1007	* #addDependentChild()) corresponding to the given interface pointer or NULL if
1008	* the given pointer is unrelated.
1009	*
1010	* The relation is checked by using the given interface pointer as a key in the
1011	* map of dependent children.
1012	*
1013	* Note that ComPtr<IUnknown> is used as an argument instead of IUnknown * in
1014	* order to guarantee IUnknown identity and disambiguation by doing
1015	* QueryInterface (IUnknown) rather than a regular C cast.
1016	*
1017	* @param aUnk Pointer to map to the dependent child object.
1018	* @return Pointer to the dependent VirtualBoxBase child object.
1019	*
1020	* @note Locks #childrenLock() for reading.
1021	*/
1022	VirtualBoxBase* VirtualBoxBaseWithChildrenNEXT::getDependentChild(const ComPtr<IUnknown> &aUnk)
1023	{
1024	AssertReturn(!aUnk.isNull(), NULL);
1025
1026	AutoCaller autoCaller(this);
1027
1028	/* return NULL if uninitDependentChildren() is in action */
1029	if (autoCaller.state() == InUninit)
1030	return NULL;
1031
1032	AutoReadLock alock(childrenLock() COMMA_LOCKVAL_SRC_POS);
1033
1034	DependentChildren::const_iterator it = mDependentChildren.find (aUnk);
1035	if (it == mDependentChildren.end())
1036	return NULL;
1037
1038	return (*it).second;
1039	}
1040
1041	/** Helper for addDependentChild(). */
1042	void VirtualBoxBaseWithChildrenNEXT::doAddDependentChild(IUnknown *aUnk,
1043	VirtualBoxBase *aChild)
1044	{
1045	AssertReturnVoid (aUnk != NULL);
1046	AssertReturnVoid (aChild != NULL);
1047
1048	AutoCaller autoCaller(this);
1049
1050	/* sanity */
1051	AssertReturnVoid (autoCaller.state() == InInit \|\|
1052	autoCaller.state() == Ready \|\|
1053	autoCaller.state() == Limited);
1054
1055	AutoWriteLock alock(childrenLock() COMMA_LOCKVAL_SRC_POS);
1056
1057	std::pair <DependentChildren::iterator, bool> result =
1058	mDependentChildren.insert (DependentChildren::value_type (aUnk, aChild));
1059	AssertMsg (result.second, ("Failed to insert child %p to the map\n", aUnk));
1060	}
1061
1062	/** Helper for removeDependentChild(). */
1063	void VirtualBoxBaseWithChildrenNEXT::doRemoveDependentChild (IUnknown *aUnk)
1064	{
1065	AssertReturnVoid (aUnk);
1066
1067	AutoCaller autoCaller(this);
1068
1069	/* sanity */
1070	AssertReturnVoid (autoCaller.state() == InUninit \|\|
1071	autoCaller.state() == InInit \|\|
1072	autoCaller.state() == Ready \|\|
1073	autoCaller.state() == Limited);
1074
1075	AutoWriteLock alock(childrenLock() COMMA_LOCKVAL_SRC_POS);
1076
1077	DependentChildren::size_type result = mDependentChildren.erase (aUnk);
1078	AssertMsg (result == 1, ("Failed to remove child %p from the map\n", aUnk));
1079	NOREF (result);
1080	}
1081
1082	/* vi: set tabstop=4 shiftwidth=4 expandtab: */

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source: vbox/trunk/src/VBox/Main/VirtualBoxBase.cpp@ 25837

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