VirtualBoxBase.cpp@ 30396

Last change on this file since 30396 was 30111, checked in by vboxsync, 14 years ago
iprt/asm.h,: Revised the ASMAtomicPtr functions and macros. The new saves lots of unsafe (void * volatile *) casts as well as adding some type safety when using GCC (typeof rulez).
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1	/* $Id: VirtualBoxBase.cpp 30111 2010-06-09 12:14:59Z vboxsync $ */
2
3	/** @file
4	*
5	* VirtualBox COM base classes implementation
6	*/
7
8	/*
9	* Copyright (C) 2006-2010 Oracle Corporation
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
20	#include <iprt/semaphore.h>
21	#include <iprt/asm.h>
22
23	#if !defined (VBOX_WITH_XPCOM)
24	#include <windows.h>
25	#include <dbghelp.h>
26	#else /* !defined (VBOX_WITH_XPCOM) */
27	/// @todo remove when VirtualBoxErrorInfo goes away from here
28	#include <nsIServiceManager.h>
29	#include <nsIExceptionService.h>
30	#endif /* !defined (VBOX_WITH_XPCOM) */
31
32	#include "VirtualBoxBase.h"
33	#include "AutoCaller.h"
34	#include "VirtualBoxErrorInfoImpl.h"
35	#include "Logging.h"
36
37	#include "objectslist.h"
38
39	////////////////////////////////////////////////////////////////////////////////
40	//
41	// VirtualBoxBase
42	//
43	////////////////////////////////////////////////////////////////////////////////
44
45	VirtualBoxBase::VirtualBoxBase()
46	: mStateLock(LOCKCLASS_OBJECTSTATE)
47	{
48	mState = NotReady;
49	mStateChangeThread = NIL_RTTHREAD;
50	mCallers = 0;
51	mZeroCallersSem = NIL_RTSEMEVENT;
52	mInitUninitSem = NIL_RTSEMEVENTMULTI;
53	mInitUninitWaiters = 0;
54	mObjectLock = NULL;
55	}
56
57	VirtualBoxBase::~VirtualBoxBase()
58	{
59	if (mObjectLock)
60	delete mObjectLock;
61	Assert(mInitUninitWaiters == 0);
62	Assert(mInitUninitSem == NIL_RTSEMEVENTMULTI);
63	if (mZeroCallersSem != NIL_RTSEMEVENT)
64	RTSemEventDestroy (mZeroCallersSem);
65	mCallers = 0;
66	mStateChangeThread = NIL_RTTHREAD;
67	mState = NotReady;
68	}
69
70	/**
71	* This virtual method returns an RWLockHandle that can be used to
72	* protect instance data. This RWLockHandle is generally referred to
73	* as the "object lock"; its locking class (for lock order validation)
74	* must be returned by another virtual method, getLockingClass(), which
75	* by default returns LOCKCLASS_OTHEROBJECT but is overridden by several
76	* subclasses such as VirtualBox, Host, Machine and others.
77	*
78	* On the first call this method lazily creates the RWLockHandle.
79	*
80	* @return
81	*/
82	/* virtual */
83	RWLockHandle *VirtualBoxBase::lockHandle() const
84	{
85	/* lazy initialization */
86	if (RT_UNLIKELY(!mObjectLock))
87	{
88	AssertCompile (sizeof (RWLockHandle ) == sizeof (void ));
89
90	// getLockingClass() is overridden by many subclasses to return
91	// one of the locking classes listed at the top of AutoLock.h
92	RWLockHandle *objLock = new RWLockHandle(getLockingClass());
93	if (!ASMAtomicCmpXchgPtr(&mObjectLock, objLock, NULL))
94	{
95	delete objLock;
96	objLock = ASMAtomicReadPtrT(&mObjectLock, RWLockHandle *);
97	}
98	return objLock;
99	}
100	return mObjectLock;
101	}
102
103	/**
104	* Increments the number of calls to this object by one.
105	*
106	* After this method succeeds, it is guaranted that the object will remain
107	* in the Ready (or in the Limited) state at least until #releaseCaller() is
108	* called.
109	*
110	* This method is intended to mark the beginning of sections of code within
111	* methods of COM objects that depend on the readiness (Ready) state. The
112	* Ready state is a primary "ready to serve" state. Usually all code that
113	* works with component's data depends on it. On practice, this means that
114	* almost every public method, setter or getter of the object should add
115	* itself as an object's caller at the very beginning, to protect from an
116	* unexpected uninitialization that may happen on a different thread.
117	*
118	* Besides the Ready state denoting that the object is fully functional,
119	* there is a special Limited state. The Limited state means that the object
120	* is still functional, but its functionality is limited to some degree, so
121	* not all operations are possible. The @a aLimited argument to this method
122	* determines whether the caller represents this limited functionality or
123	* not.
124	*
125	* This method succeeeds (and increments the number of callers) only if the
126	* current object's state is Ready. Otherwise, it will return E_ACCESSDENIED
127	* to indicate that the object is not operational. There are two exceptions
128	* from this rule:
129	* <ol>
130	* <li>If the @a aLimited argument is \|true\|, then this method will also
131	* succeeed if the object's state is Limited (or Ready, of course).
132	* </li>
133	* <li>If this method is called from the same thread that placed
134	* the object to InInit or InUninit state (i.e. either from within the
135	* AutoInitSpan or AutoUninitSpan scope), it will succeed as well (but
136	* will not increase the number of callers).
137	* </li>
138	* </ol>
139	*
140	* Normally, calling addCaller() never blocks. However, if this method is
141	* called by a thread created from within the AutoInitSpan scope and this
142	* scope is still active (i.e. the object state is InInit), it will block
143	* until the AutoInitSpan destructor signals that it has finished
144	* initialization.
145	*
146	* When this method returns a failure, the caller must not use the object
147	* and should return the failed result code to its own caller.
148	*
149	* @param aState Where to store the current object's state (can be
150	* used in overriden methods to determine the cause of
151	* the failure).
152	* @param aLimited \|true\| to add a limited caller.
153	*
154	* @return S_OK on success or E_ACCESSDENIED on failure.
155	*
156	* @note It is preferrable to use the #addLimitedCaller() rather than
157	* calling this method with @a aLimited = \|true\|, for better
158	* self-descriptiveness.
159	*
160	* @sa #addLimitedCaller()
161	* @sa #releaseCaller()
162	*/
163	HRESULT VirtualBoxBase::addCaller(State aState / = NULL */,
164	bool aLimited /* = false */)
165	{
166	AutoWriteLock stateLock(mStateLock COMMA_LOCKVAL_SRC_POS);
167
168	HRESULT rc = E_ACCESSDENIED;
169
170	if (mState == Ready \|\| (aLimited && mState == Limited))
171	{
172	/* if Ready or allows Limited, increase the number of callers */
173	++ mCallers;
174	rc = S_OK;
175	}
176	else
177	if (mState == InInit \|\| mState == InUninit)
178	{
179	if (mStateChangeThread == RTThreadSelf())
180	{
181	/* Called from the same thread that is doing AutoInitSpan or
182	* AutoUninitSpan, just succeed */
183	rc = S_OK;
184	}
185	else if (mState == InInit)
186	{
187	/* 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	* Note that we increase the number of callers anyway -- to
193	* prevent AutoUninitSpan from early completion if we are
194	* still not scheduled to pick up the posted semaphore when
195	* uninit() is called.
196	*/
197	++ mCallers;
198
199	/* lazy semaphore creation */
200	if (mInitUninitSem == NIL_RTSEMEVENTMULTI)
201	{
202	RTSemEventMultiCreate (&mInitUninitSem);
203	Assert(mInitUninitWaiters == 0);
204	}
205
206	++ mInitUninitWaiters;
207
208	LogFlowThisFunc(("Waiting for AutoInitSpan/AutoReinitSpan to finish...\n"));
209
210	stateLock.leave();
211	RTSemEventMultiWait (mInitUninitSem, RT_INDEFINITE_WAIT);
212	stateLock.enter();
213
214	if (-- mInitUninitWaiters == 0)
215	{
216	/* destroy the semaphore since no more necessary */
217	RTSemEventMultiDestroy (mInitUninitSem);
218	mInitUninitSem = NIL_RTSEMEVENTMULTI;
219	}
220
221	if (mState == Ready \|\| (aLimited && mState == Limited))
222	rc = S_OK;
223	else
224	{
225	Assert(mCallers != 0);
226	-- mCallers;
227	if (mCallers == 0 && mState == InUninit)
228	{
229	/* inform AutoUninitSpan ctor there are no more callers */
230	RTSemEventSignal (mZeroCallersSem);
231	}
232	}
233	}
234	}
235
236	if (aState)
237	*aState = mState;
238
239	return rc;
240	}
241
242	/**
243	* Decreases the number of calls to this object by one.
244	*
245	* Must be called after every #addCaller() or #addLimitedCaller() when
246	* protecting the object from uninitialization is no more necessary.
247	*/
248	void VirtualBoxBase::releaseCaller()
249	{
250	AutoWriteLock stateLock(mStateLock COMMA_LOCKVAL_SRC_POS);
251
252	if (mState == Ready \|\| mState == Limited)
253	{
254	/* if Ready or Limited, decrease the number of callers */
255	AssertMsgReturn(mCallers != 0, ("mCallers is ZERO!"), (void) 0);
256	--mCallers;
257
258	return;
259	}
260
261	if (mState == InInit \|\| mState == InUninit)
262	{
263	if (mStateChangeThread == RTThreadSelf())
264	{
265	/* Called from the same thread that is doing AutoInitSpan or
266	* AutoUninitSpan: just succeed */
267	return;
268	}
269
270	if (mState == InUninit)
271	{
272	/* the caller is being released after AutoUninitSpan has begun */
273	AssertMsgReturn(mCallers != 0, ("mCallers is ZERO!"), (void) 0);
274	--mCallers;
275
276	if (mCallers == 0)
277	/* inform the AutoUninitSpan ctor there are no more callers /
278	RTSemEventSignal(mZeroCallersSem);
279
280	return;
281	}
282	}
283
284	AssertMsgFailed (("mState = %d!", mState));
285	}
286
287	////////////////////////////////////////////////////////////////////////////////
288	//
289	// AutoInitSpan methods
290	//
291	////////////////////////////////////////////////////////////////////////////////
292
293	/**
294	* Creates a smart initialization span object that places the object to
295	* InInit state.
296	*
297	* Please see the AutoInitSpan class description for more info.
298	*
299	* @param aObj \|this\| pointer of the managed VirtualBoxBase object whose
300	* init() method is being called.
301	* @param aResult Default initialization result.
302	*/
303	AutoInitSpan::AutoInitSpan(VirtualBoxBase *aObj,
304	Result aResult /* = Failed */)
305	: mObj(aObj),
306	mResult(aResult),
307	mOk(false)
308	{
309	Assert(aObj);
310
311	AutoWriteLock stateLock(mObj->mStateLock COMMA_LOCKVAL_SRC_POS);
312
313	mOk = mObj->mState == VirtualBoxBase::NotReady;
314	AssertReturnVoid (mOk);
315
316	mObj->setState(VirtualBoxBase::InInit);
317	}
318
319	/**
320	* Places the managed VirtualBoxBase object to Ready/Limited state if the
321	* initialization succeeded or partly succeeded, or places it to InitFailed
322	* state and calls the object's uninit() method.
323	*
324	* Please see the AutoInitSpan class description for more info.
325	*/
326	AutoInitSpan::~AutoInitSpan()
327	{
328	/* if the state was other than NotReady, do nothing */
329	if (!mOk)
330	return;
331
332	AutoWriteLock stateLock(mObj->mStateLock COMMA_LOCKVAL_SRC_POS);
333
334	Assert(mObj->mState == VirtualBoxBase::InInit);
335
336	if (mObj->mCallers > 0)
337	{
338	Assert(mObj->mInitUninitWaiters > 0);
339
340	/* We have some pending addCaller() calls on other threads (created
341	* during InInit), signal that InInit is finished and they may go on. */
342	RTSemEventMultiSignal(mObj->mInitUninitSem);
343	}
344
345	if (mResult == Succeeded)
346	{
347	mObj->setState(VirtualBoxBase::Ready);
348	}
349	else
350	if (mResult == Limited)
351	{
352	mObj->setState(VirtualBoxBase::Limited);
353	}
354	else
355	{
356	mObj->setState(VirtualBoxBase::InitFailed);
357	/* leave the lock to prevent nesting when uninit() is called */
358	stateLock.leave();
359	/* call uninit() to let the object uninit itself after failed init() */
360	mObj->uninit();
361	/* Note: the object may no longer exist here (for example, it can call
362	* the destructor in uninit()) */
363	}
364	}
365
366	// AutoReinitSpan methods
367	////////////////////////////////////////////////////////////////////////////////
368
369	/**
370	* Creates a smart re-initialization span object and places the object to
371	* InInit state.
372	*
373	* Please see the AutoInitSpan class description for more info.
374	*
375	* @param aObj \|this\| pointer of the managed VirtualBoxBase object whose
376	* re-initialization method is being called.
377	*/
378	AutoReinitSpan::AutoReinitSpan(VirtualBoxBase *aObj)
379	: mObj(aObj),
380	mSucceeded(false),
381	mOk(false)
382	{
383	Assert(aObj);
384
385	AutoWriteLock stateLock(mObj->mStateLock COMMA_LOCKVAL_SRC_POS);
386
387	mOk = mObj->mState == VirtualBoxBase::Limited;
388	AssertReturnVoid (mOk);
389
390	mObj->setState(VirtualBoxBase::InInit);
391	}
392
393	/**
394	* Places the managed VirtualBoxBase object to Ready state if the
395	* re-initialization succeeded (i.e. #setSucceeded() has been called) or back to
396	* Limited state otherwise.
397	*
398	* Please see the AutoInitSpan class description for more info.
399	*/
400	AutoReinitSpan::~AutoReinitSpan()
401	{
402	/* if the state was other than Limited, do nothing */
403	if (!mOk)
404	return;
405
406	AutoWriteLock stateLock(mObj->mStateLock COMMA_LOCKVAL_SRC_POS);
407
408	Assert(mObj->mState == VirtualBoxBase::InInit);
409
410	if (mObj->mCallers > 0 && mObj->mInitUninitWaiters > 0)
411	{
412	/* We have some pending addCaller() calls on other threads (created
413	* during InInit), signal that InInit is finished and they may go on. */
414	RTSemEventMultiSignal(mObj->mInitUninitSem);
415	}
416
417	if (mSucceeded)
418	{
419	mObj->setState(VirtualBoxBase::Ready);
420	}
421	else
422	{
423	mObj->setState(VirtualBoxBase::Limited);
424	}
425	}
426
427	// AutoUninitSpan methods
428	////////////////////////////////////////////////////////////////////////////////
429
430	/**
431	* Creates a smart uninitialization span object and places this object to
432	* InUninit state.
433	*
434	* Please see the AutoInitSpan class description for more info.
435	*
436	* @note This method blocks the current thread execution until the number of
437	* callers of the managed VirtualBoxBase object drops to zero!
438	*
439	* @param aObj \|this\| pointer of the VirtualBoxBase object whose uninit()
440	* method is being called.
441	*/
442	AutoUninitSpan::AutoUninitSpan(VirtualBoxBase *aObj)
443	: mObj(aObj),
444	mInitFailed(false),
445	mUninitDone(false)
446	{
447	Assert(aObj);
448
449	AutoWriteLock stateLock(mObj->mStateLock COMMA_LOCKVAL_SRC_POS);
450
451	Assert(mObj->mState != VirtualBoxBase::InInit);
452
453	/* Set mUninitDone to \|true\| if this object is already uninitialized
454	* (NotReady) or if another AutoUninitSpan is currently active on some
455	* other thread (InUninit). */
456	mUninitDone = mObj->mState == VirtualBoxBase::NotReady
457	\|\| mObj->mState == VirtualBoxBase::InUninit;
458
459	if (mObj->mState == VirtualBoxBase::InitFailed)
460	{
461	/* we've been called by init() on failure */
462	mInitFailed = true;
463	}
464	else
465	{
466	if (mUninitDone)
467	{
468	/* do nothing if already uninitialized */
469	if (mObj->mState == VirtualBoxBase::NotReady)
470	return;
471
472	/* otherwise, wait until another thread finishes uninitialization.
473	* This is necessary to make sure that when this method returns, the
474	* object is NotReady and therefore can be deleted (for example).
475	* In particular, this is used by
476	* VirtualBoxBaseWithTypedChildrenNEXT::uninitDependentChildren(). */
477
478	/* lazy semaphore creation */
479	if (mObj->mInitUninitSem == NIL_RTSEMEVENTMULTI)
480	{
481	RTSemEventMultiCreate(&mObj->mInitUninitSem);
482	Assert(mObj->mInitUninitWaiters == 0);
483	}
484	++mObj->mInitUninitWaiters;
485
486	LogFlowFunc(("{%p}: Waiting for AutoUninitSpan to finish...\n",
487	mObj));
488
489	stateLock.leave();
490	RTSemEventMultiWait(mObj->mInitUninitSem, RT_INDEFINITE_WAIT);
491	stateLock.enter();
492
493	if (--mObj->mInitUninitWaiters == 0)
494	{
495	/* destroy the semaphore since no more necessary */
496	RTSemEventMultiDestroy(mObj->mInitUninitSem);
497	mObj->mInitUninitSem = NIL_RTSEMEVENTMULTI;
498	}
499
500	return;
501	}
502	}
503
504	/* go to InUninit to prevent from adding new callers */
505	mObj->setState(VirtualBoxBase::InUninit);
506
507	/* wait for already existing callers to drop to zero */
508	if (mObj->mCallers > 0)
509	{
510	/* lazy creation */
511	Assert(mObj->mZeroCallersSem == NIL_RTSEMEVENT);
512	RTSemEventCreate(&mObj->mZeroCallersSem);
513
514	/* wait until remaining callers release the object */
515	LogFlowFunc(("{%p}: Waiting for callers (%d) to drop to zero...\n",
516	mObj, mObj->mCallers));
517
518	stateLock.leave();
519	RTSemEventWait(mObj->mZeroCallersSem, RT_INDEFINITE_WAIT);
520	}
521	}
522
523	/**
524	* Places the managed VirtualBoxBase object to the NotReady state.
525	*/
526	AutoUninitSpan::~AutoUninitSpan()
527	{
528	/* do nothing if already uninitialized */
529	if (mUninitDone)
530	return;
531
532	AutoWriteLock stateLock(mObj->mStateLock COMMA_LOCKVAL_SRC_POS);
533
534	Assert(mObj->mState == VirtualBoxBase::InUninit);
535
536	mObj->setState(VirtualBoxBase::NotReady);
537	}
538
539	////////////////////////////////////////////////////////////////////////////////
540	//
541	// VirtualBoxBase
542	//
543	////////////////////////////////////////////////////////////////////////////////
544
545	/**
546	* Translates the given text string according to the currently installed
547	* translation table and current context. The current context is determined
548	* by the context parameter. Additionally, a comment to the source text
549	* string text can be given. This comment (which is NULL by default)
550	* is helpful in situations where it is necessary to distinguish between
551	* two or more semantically different roles of the same source text in the
552	* same context.
553	*
554	* @param context the context of the translation (can be NULL
555	* to indicate the global context)
556	* @param sourceText the string to translate
557	* @param comment the comment to the string (NULL means no comment)
558	*
559	* @return
560	* the translated version of the source string in UTF-8 encoding,
561	* or the source string itself if the translation is not found
562	* in the given context.
563	*/
564	// static
565	const char VirtualBoxBase::translate (const char /* context /, const char sourceText,
566	const char * /* comment */)
567	{
568	#if 0
569	Log(("VirtualBoxBase::translate:\n"
570	" context={%s}\n"
571	" sourceT={%s}\n"
572	" comment={%s}\n",
573	context, sourceText, comment));
574	#endif
575
576	/// @todo (dmik) incorporate Qt translation file parsing and lookup
577	return sourceText;
578	}
579
580	////////////////////////////////////////////////////////////////////////////////
581	//
582	// VirtualBoxSupportTranslationBase
583	//
584	////////////////////////////////////////////////////////////////////////////////
585
586	/**
587	* Modifies the given argument so that it will contain only a class name
588	* (null-terminated). The argument must point to a <b>non-constant</b>
589	* string containing a valid value, as it is generated by the
590	* __PRETTY_FUNCTION__ built-in macro of the GCC compiler, or by the
591	* __FUNCTION__ macro of any other compiler.
592	*
593	* The function assumes that the macro is used within the member of the
594	* class derived from the VirtualBoxSupportTranslation<> template.
595	*
596	* @param prettyFunctionName string to modify
597	* @return
598	* true on success and false otherwise
599	*/
600	bool VirtualBoxSupportTranslationBase::cutClassNameFrom__PRETTY_FUNCTION__ (char *fn)
601	{
602	Assert(fn);
603	if (!fn)
604	return false;
605
606	#if defined (__GNUC__)
607
608	// the format is like:
609	// VirtualBoxSupportTranslation<C>::VirtualBoxSupportTranslation() [with C = VirtualBox]
610
611	#define START " = "
612	#define END "]"
613
614	#elif defined (_MSC_VER)
615
616	// the format is like:
617	// VirtualBoxSupportTranslation<class VirtualBox>::__ctor
618
619	#define START "<class "
620	#define END ">::"
621
622	#endif
623
624	char *start = strstr(fn, START);
625	Assert(start);
626	if (start)
627	{
628	start += sizeof(START) - 1;
629	char *end = strstr(start, END);
630	Assert(end && (end > start));
631	if (end && (end > start))
632	{
633	size_t len = end - start;
634	memmove(fn, start, len);
635	fn[len] = 0;
636	return true;
637	}
638	}
639
640	#undef END
641	#undef START
642
643	return false;
644	}
645
646	////////////////////////////////////////////////////////////////////////////////
647	//
648	// VirtualBoxSupportErrorInfoImplBase
649	//
650	////////////////////////////////////////////////////////////////////////////////
651
652	RTTLS VirtualBoxSupportErrorInfoImplBase::MultiResult::sCounter = NIL_RTTLS;
653
654	void VirtualBoxSupportErrorInfoImplBase::MultiResult::init()
655	{
656	if (sCounter == NIL_RTTLS)
657	{
658	sCounter = RTTlsAlloc();
659	AssertReturnVoid (sCounter != NIL_RTTLS);
660	}
661
662	uintptr_t counter = (uintptr_t) RTTlsGet (sCounter);
663	++ counter;
664	RTTlsSet (sCounter, (void *) counter);
665	}
666
667	VirtualBoxSupportErrorInfoImplBase::MultiResult::~MultiResult()
668	{
669	uintptr_t counter = (uintptr_t) RTTlsGet (sCounter);
670	AssertReturnVoid (counter != 0);
671	-- counter;
672	RTTlsSet (sCounter, (void *) counter);
673	}
674
675	/**
676	* Sets error info for the current thread. This is an internal function that
677	* gets eventually called by all public variants. If @a aWarning is
678	* @c true, then the highest (31) bit in the @a aResultCode value which
679	* indicates the error severity is reset to zero to make sure the receiver will
680	* recognize that the created error info object represents a warning rather
681	* than an error.
682	*/
683	/* static */
684	HRESULT VirtualBoxSupportErrorInfoImplBase::setErrorInternal(HRESULT aResultCode,
685	const GUID &aIID,
686	const wchar_t *aComponent,
687	const Bstr &aText,
688	bool aWarning,
689	bool aLogIt)
690	{
691	/* whether multi-error mode is turned on */
692	bool preserve = ((uintptr_t)RTTlsGet(MultiResult::sCounter)) > 0;
693
694	Bstr bstrComponent((CBSTR)aComponent);
695
696	if (aLogIt)
697	LogRel(("ERROR [COM]: aRC=%Rhrc (%#08x) aIID={%RTuuid} aComponent={%ls} aText={%ls} "
698	"aWarning=%RTbool, preserve=%RTbool\n",
699	aResultCode, aResultCode, &aIID, bstrComponent.raw(), aText.raw(), aWarning,
700	preserve));
701
702	/* these are mandatory, others -- not */
703	AssertReturn((!aWarning && FAILED(aResultCode)) \|\|
704	(aWarning && aResultCode != S_OK),
705	E_FAIL);
706	AssertReturn(!aText.isEmpty(), E_FAIL);
707
708	/* reset the error severity bit if it's a warning */
709	if (aWarning)
710	aResultCode &= ~0x80000000;
711
712	HRESULT rc = S_OK;
713
714	do
715	{
716	ComObjPtr<VirtualBoxErrorInfo> info;
717	rc = info.createObject();
718	if (FAILED(rc)) break;
719
720	#if !defined (VBOX_WITH_XPCOM)
721
722	ComPtr<IVirtualBoxErrorInfo> curInfo;
723	if (preserve)
724	{
725	/* get the current error info if any */
726	ComPtr<IErrorInfo> err;
727	rc = ::GetErrorInfo (0, err.asOutParam());
728	if (FAILED(rc)) break;
729	rc = err.queryInterfaceTo(curInfo.asOutParam());
730	if (FAILED(rc))
731	{
732	/* create a IVirtualBoxErrorInfo wrapper for the native
733	* IErrorInfo object */
734	ComObjPtr<VirtualBoxErrorInfo> wrapper;
735	rc = wrapper.createObject();
736	if (SUCCEEDED(rc))
737	{
738	rc = wrapper->init (err);
739	if (SUCCEEDED(rc))
740	curInfo = wrapper;
741	}
742	}
743	}
744	/* On failure, curInfo will stay null */
745	Assert(SUCCEEDED(rc) \|\| curInfo.isNull());
746
747	/* set the current error info and preserve the previous one if any */
748	rc = info->init(aResultCode, aIID, bstrComponent, aText, curInfo);
749	if (FAILED(rc)) break;
750
751	ComPtr<IErrorInfo> err;
752	rc = info.queryInterfaceTo(err.asOutParam());
753	if (SUCCEEDED(rc))
754	rc = ::SetErrorInfo (0, err);
755
756	#else // !defined (VBOX_WITH_XPCOM)
757
758	nsCOMPtr <nsIExceptionService> es;
759	es = do_GetService (NS_EXCEPTIONSERVICE_CONTRACTID, &rc);
760	if (NS_SUCCEEDED(rc))
761	{
762	nsCOMPtr <nsIExceptionManager> em;
763	rc = es->GetCurrentExceptionManager (getter_AddRefs (em));
764	if (FAILED(rc)) break;
765
766	ComPtr<IVirtualBoxErrorInfo> curInfo;
767	if (preserve)
768	{
769	/* get the current error info if any */
770	ComPtr<nsIException> ex;
771	rc = em->GetCurrentException (ex.asOutParam());
772	if (FAILED(rc)) break;
773	rc = ex.queryInterfaceTo(curInfo.asOutParam());
774	if (FAILED(rc))
775	{
776	/* create a IVirtualBoxErrorInfo wrapper for the native
777	* nsIException object */
778	ComObjPtr<VirtualBoxErrorInfo> wrapper;
779	rc = wrapper.createObject();
780	if (SUCCEEDED(rc))
781	{
782	rc = wrapper->init (ex);
783	if (SUCCEEDED(rc))
784	curInfo = wrapper;
785	}
786	}
787	}
788	/* On failure, curInfo will stay null */
789	Assert(SUCCEEDED(rc) \|\| curInfo.isNull());
790
791	/* set the current error info and preserve the previous one if any */
792	rc = info->init(aResultCode, aIID, bstrComponent, aText, curInfo);
793	if (FAILED(rc)) break;
794
795	ComPtr<nsIException> ex;
796	rc = info.queryInterfaceTo(ex.asOutParam());
797	if (SUCCEEDED(rc))
798	rc = em->SetCurrentException (ex);
799	}
800	else if (rc == NS_ERROR_UNEXPECTED)
801	{
802	/*
803	* It is possible that setError() is being called by the object
804	* after the XPCOM shutdown sequence has been initiated
805	* (for example, when XPCOM releases all instances it internally
806	* references, which can cause object's FinalConstruct() and then
807	* uninit()). In this case, do_GetService() above will return
808	* NS_ERROR_UNEXPECTED and it doesn't actually make sense to
809	* set the exception (nobody will be able to read it).
810	*/
811	LogWarningFunc (("Will not set an exception because "
812	"nsIExceptionService is not available "
813	"(NS_ERROR_UNEXPECTED). "
814	"XPCOM is being shutdown?\n"));
815	rc = NS_OK;
816	}
817
818	#endif // !defined (VBOX_WITH_XPCOM)
819	}
820	while (0);
821
822	AssertComRC (rc);
823
824	return SUCCEEDED(rc) ? aResultCode : rc;
825	}
826
827
828	/**
829	* Uninitializes all dependent children registered on this object with
830	* #addDependentChild().
831	*
832	* Must be called from within the AutoUninitSpan (i.e.
833	* typically from this object's uninit() method) to uninitialize children
834	* before this object goes out of service and becomes unusable.
835	*
836	* Note that this method will call uninit() methods of child objects. If
837	* these methods need to call the parent object during uninitialization,
838	* #uninitDependentChildren() must be called before the relevant part of the
839	* parent is uninitialized: usually at the begnning of the parent
840	* uninitialization sequence.
841	*
842	* Keep in mind that the uninitialized child objects may be no longer available
843	* (i.e. may be deleted) after this method returns.
844	*
845	* @note Locks #childrenLock() for writing.
846	*
847	* @note May lock something else through the called children.
848	*/
849	void VirtualBoxBaseWithChildrenNEXT::uninitDependentChildren()
850	{
851	AutoCaller autoCaller(this);
852
853	/* sanity */
854	AssertReturnVoid (autoCaller.state() == InUninit \|\|
855	autoCaller.state() == InInit);
856
857	AutoWriteLock chLock(childrenLock() COMMA_LOCKVAL_SRC_POS);
858
859	size_t count = mDependentChildren.size();
860
861	while (count != 0)
862	{
863	/* strongly reference the weak child from the map to make sure it won't
864	* be deleted while we've released the lock */
865	DependentChildren::iterator it = mDependentChildren.begin();
866	ComPtr<IUnknown> unk = it->first;
867	Assert(!unk.isNull());
868
869	VirtualBoxBase *child = it->second;
870
871	/* release the lock to let children stuck in removeDependentChild() go
872	* on (otherwise we'll deadlock in uninit() */
873	chLock.leave();
874
875	/* Note that if child->uninit() happens to be called on another
876	* thread right before us and is not yet finished, the second
877	* uninit() call will wait until the first one has done so
878	* (thanks to AutoUninitSpan). */
879	Assert(child);
880	if (child)
881	child->uninit();
882
883	chLock.enter();
884
885	/* uninit() is guaranteed to be done here so the child must be already
886	* deleted from the list by removeDependentChild() called from there.
887	* Do some checks to avoid endless loops when the user is forgetful */
888	-- count;
889	Assert(count == mDependentChildren.size());
890	if (count != mDependentChildren.size())
891	mDependentChildren.erase (it);
892
893	Assert(count == mDependentChildren.size());
894	}
895	}
896
897	/**
898	* Returns a pointer to the dependent child (registered using
899	* #addDependentChild()) corresponding to the given interface pointer or NULL if
900	* the given pointer is unrelated.
901	*
902	* The relation is checked by using the given interface pointer as a key in the
903	* map of dependent children.
904	*
905	* Note that ComPtr<IUnknown> is used as an argument instead of IUnknown * in
906	* order to guarantee IUnknown identity and disambiguation by doing
907	* QueryInterface (IUnknown) rather than a regular C cast.
908	*
909	* @param aUnk Pointer to map to the dependent child object.
910	* @return Pointer to the dependent VirtualBoxBase child object.
911	*
912	* @note Locks #childrenLock() for reading.
913	*/
914	VirtualBoxBase* VirtualBoxBaseWithChildrenNEXT::getDependentChild(const ComPtr<IUnknown> &aUnk)
915	{
916	AssertReturn(!aUnk.isNull(), NULL);
917
918	AutoCaller autoCaller(this);
919
920	/* return NULL if uninitDependentChildren() is in action */
921	if (autoCaller.state() == InUninit)
922	return NULL;
923
924	AutoReadLock alock(childrenLock() COMMA_LOCKVAL_SRC_POS);
925
926	DependentChildren::const_iterator it = mDependentChildren.find (aUnk);
927	if (it == mDependentChildren.end())
928	return NULL;
929
930	return (*it).second;
931	}
932
933	/** Helper for addDependentChild(). */
934	void VirtualBoxBaseWithChildrenNEXT::doAddDependentChild(IUnknown *aUnk,
935	VirtualBoxBase *aChild)
936	{
937	AssertReturnVoid (aUnk != NULL);
938	AssertReturnVoid (aChild != NULL);
939
940	AutoCaller autoCaller(this);
941
942	/* sanity */
943	AssertReturnVoid (autoCaller.state() == InInit \|\|
944	autoCaller.state() == Ready \|\|
945	autoCaller.state() == Limited);
946
947	AutoWriteLock alock(childrenLock() COMMA_LOCKVAL_SRC_POS);
948
949	std::pair <DependentChildren::iterator, bool> result =
950	mDependentChildren.insert (DependentChildren::value_type (aUnk, aChild));
951	AssertMsg (result.second, ("Failed to insert child %p to the map\n", aUnk));
952	}
953
954	/** Helper for removeDependentChild(). */
955	void VirtualBoxBaseWithChildrenNEXT::doRemoveDependentChild (IUnknown *aUnk)
956	{
957	AssertReturnVoid (aUnk);
958
959	AutoCaller autoCaller(this);
960
961	/* sanity */
962	AssertReturnVoid (autoCaller.state() == InUninit \|\|
963	autoCaller.state() == InInit \|\|
964	autoCaller.state() == Ready \|\|
965	autoCaller.state() == Limited);
966
967	AutoWriteLock alock(childrenLock() COMMA_LOCKVAL_SRC_POS);
968
969	DependentChildren::size_type result = mDependentChildren.erase (aUnk);
970	AssertMsg (result == 1, ("Failed to remove child %p from the map\n", aUnk));
971	NOREF (result);
972	}
973
974	/* vi: set tabstop=4 shiftwidth=4 expandtab: */

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source: vbox/trunk/src/VBox/Main/VirtualBoxBase.cpp@ 30396

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