VirtualBoxBase.cpp@ 26254

Last change on this file since 26254 was 26186, checked in by vboxsync, 15 years ago
Main: coding style fixes
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1	/* $Id: VirtualBoxBase.cpp 26186 2010-02-03 13:07:12Z 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 "AutoCaller.h"
38	#include "VirtualBoxErrorInfoImpl.h"
39	#include "Logging.h"
40
41	#include "objectslist.h"
42
43	////////////////////////////////////////////////////////////////////////////////
44	//
45	// VirtualBoxBase
46	//
47	////////////////////////////////////////////////////////////////////////////////
48
49	VirtualBoxBase::VirtualBoxBase()
50	: mStateLock(LOCKCLASS_OBJECTSTATE)
51	{
52	mState = NotReady;
53	mStateChangeThread = NIL_RTTHREAD;
54	mCallers = 0;
55	mZeroCallersSem = NIL_RTSEMEVENT;
56	mInitUninitSem = NIL_RTSEMEVENTMULTI;
57	mInitUninitWaiters = 0;
58	mObjectLock = NULL;
59	}
60
61	VirtualBoxBase::~VirtualBoxBase()
62	{
63	if (mObjectLock)
64	delete mObjectLock;
65	Assert(mInitUninitWaiters == 0);
66	Assert(mInitUninitSem == NIL_RTSEMEVENTMULTI);
67	if (mZeroCallersSem != NIL_RTSEMEVENT)
68	RTSemEventDestroy (mZeroCallersSem);
69	mCallers = 0;
70	mStateChangeThread = NIL_RTTHREAD;
71	mState = NotReady;
72	}
73
74	/**
75	* This virtual method returns an RWLockHandle that can be used to
76	* protect instance data. This RWLockHandle is generally referred to
77	* as the "object lock"; its locking class (for lock order validation)
78	* must be returned by another virtual method, getLockingClass(), which
79	* by default returns LOCKCLASS_OTHEROBJECT but is overridden by several
80	* subclasses such as VirtualBox, Host, Machine and others.
81	*
82	* On the first call this method lazily creates the RWLockHandle.
83	*
84	* @return
85	*/
86	/* virtual */
87	RWLockHandle *VirtualBoxBase::lockHandle() const
88	{
89	/* lazy initialization */
90	if (RT_UNLIKELY(!mObjectLock))
91	{
92	AssertCompile (sizeof (RWLockHandle ) == sizeof (void ));
93
94	// getLockingClass() is overridden by many subclasses to return
95	// one of the locking classes listed at the top of AutoLock.h
96	RWLockHandle *objLock = new RWLockHandle(getLockingClass());
97	if (!ASMAtomicCmpXchgPtr ((void * volatile *) &mObjectLock, objLock, NULL))
98	{
99	delete objLock;
100	objLock = (RWLockHandle ) ASMAtomicReadPtr ((void volatile *) &mObjectLock);
101	}
102	return objLock;
103	}
104	return mObjectLock;
105	}
106
107	/**
108	* Increments the number of calls to this object by one.
109	*
110	* After this method succeeds, it is guaranted that the object will remain
111	* in the Ready (or in the Limited) state at least until #releaseCaller() is
112	* called.
113	*
114	* This method is intended to mark the beginning of sections of code within
115	* methods of COM objects that depend on the readiness (Ready) state. The
116	* Ready state is a primary "ready to serve" state. Usually all code that
117	* works with component's data depends on it. On practice, this means that
118	* almost every public method, setter or getter of the object should add
119	* itself as an object's caller at the very beginning, to protect from an
120	* unexpected uninitialization that may happen on a different thread.
121	*
122	* Besides the Ready state denoting that the object is fully functional,
123	* there is a special Limited state. The Limited state means that the object
124	* is still functional, but its functionality is limited to some degree, so
125	* not all operations are possible. The @a aLimited argument to this method
126	* determines whether the caller represents this limited functionality or
127	* not.
128	*
129	* This method succeeeds (and increments the number of callers) only if the
130	* current object's state is Ready. Otherwise, it will return E_ACCESSDENIED
131	* to indicate that the object is not operational. There are two exceptions
132	* from this rule:
133	* <ol>
134	* <li>If the @a aLimited argument is \|true\|, then this method will also
135	* succeeed if the object's state is Limited (or Ready, of course).
136	* </li>
137	* <li>If this method is called from the same thread that placed
138	* the object to InInit or InUninit state (i.e. either from within the
139	* AutoInitSpan or AutoUninitSpan scope), it will succeed as well (but
140	* will not increase the number of callers).
141	* </li>
142	* </ol>
143	*
144	* Normally, calling addCaller() never blocks. However, if this method is
145	* called by a thread created from within the AutoInitSpan scope and this
146	* scope is still active (i.e. the object state is InInit), it will block
147	* until the AutoInitSpan destructor signals that it has finished
148	* initialization.
149	*
150	* Also, addCaller() will block if the object is probing uninitialization on
151	* another thread with AutoMayUninitSpan (i.e. the object state is MayUninit).
152	* And again, the block will last until the AutoMayUninitSpan destructor signals
153	* that it has finished probing and the object is either ready again or will
154	* uninitialize shortly (so that addCaller() will fail).
155	*
156	* When this method returns a failure, the caller must not use the object
157	* and should return the failed result code to its own caller.
158	*
159	* @param aState Where to store the current object's state (can be
160	* used in overriden methods to determine the cause of
161	* the failure).
162	* @param aLimited \|true\| to add a limited caller.
163	*
164	* @return S_OK on success or E_ACCESSDENIED on failure.
165	*
166	* @note It is preferrable to use the #addLimitedCaller() rather than
167	* calling this method with @a aLimited = \|true\|, for better
168	* self-descriptiveness.
169	*
170	* @sa #addLimitedCaller()
171	* @sa #releaseCaller()
172	*/
173	HRESULT VirtualBoxBase::addCaller(State aState / = NULL */,
174	bool aLimited /* = false */)
175	{
176	AutoWriteLock stateLock(mStateLock COMMA_LOCKVAL_SRC_POS);
177
178	HRESULT rc = E_ACCESSDENIED;
179
180	if (mState == Ready \|\| (aLimited && mState == Limited))
181	{
182	/* if Ready or allows Limited, increase the number of callers */
183	++ mCallers;
184	rc = S_OK;
185	}
186	else
187	if (mState == InInit \|\| mState == MayUninit \|\| mState == InUninit)
188	{
189	if (mStateChangeThread == RTThreadSelf())
190	{
191	/* Called from the same thread that is doing AutoInitSpan or
192	* AutoUninitSpan or AutoMayUninitSpan, just succeed */
193	rc = S_OK;
194	}
195	else if (mState == InInit \|\| mState == MayUninit)
196	{
197	/* One of the two:
198	*
199	* 1) addCaller() is called by a "child" thread while the "parent"
200	* thread is still doing AutoInitSpan/AutoReinitSpan, so wait for
201	* the state to become either Ready/Limited or InitFailed (in
202	* case of init failure).
203	*
204	* 2) addCaller() is called while another thread is in
205	* AutoMayUninitSpan, so wait for the state to become either
206	* Ready or WillUninit.
207	*
208	* Note that in either case we increase the number of callers anyway
209	* -- to prevent AutoUninitSpan from early completion if we are
210	* still not scheduled to pick up the posted semaphore when uninit()
211	* is called.
212	*/
213	++ mCallers;
214
215	/* lazy semaphore creation */
216	if (mInitUninitSem == NIL_RTSEMEVENTMULTI)
217	{
218	RTSemEventMultiCreate (&mInitUninitSem);
219	Assert(mInitUninitWaiters == 0);
220	}
221
222	++ mInitUninitWaiters;
223
224	LogFlowThisFunc((mState == InInit ?
225	"Waiting for AutoInitSpan/AutoReinitSpan to "
226	"finish...\n" :
227	"Waiting for AutoMayUninitSpan to finish...\n"));
228
229	stateLock.leave();
230	RTSemEventMultiWait (mInitUninitSem, RT_INDEFINITE_WAIT);
231	stateLock.enter();
232
233	if (-- mInitUninitWaiters == 0)
234	{
235	/* destroy the semaphore since no more necessary */
236	RTSemEventMultiDestroy (mInitUninitSem);
237	mInitUninitSem = NIL_RTSEMEVENTMULTI;
238	}
239
240	if (mState == Ready \|\| (aLimited && mState == Limited))
241	rc = S_OK;
242	else
243	{
244	Assert(mCallers != 0);
245	-- mCallers;
246	if (mCallers == 0 && mState == InUninit)
247	{
248	/* inform AutoUninitSpan ctor there are no more callers */
249	RTSemEventSignal (mZeroCallersSem);
250	}
251	}
252	}
253	}
254
255	if (aState)
256	*aState = mState;
257
258	return rc;
259	}
260
261	/**
262	* Decreases the number of calls to this object by one.
263	*
264	* Must be called after every #addCaller() or #addLimitedCaller() when
265	* protecting the object from uninitialization is no more necessary.
266	*/
267	void VirtualBoxBase::releaseCaller()
268	{
269	AutoWriteLock stateLock(mStateLock COMMA_LOCKVAL_SRC_POS);
270
271	if (mState == Ready \|\| mState == Limited)
272	{
273	/* if Ready or Limited, decrease the number of callers */
274	AssertMsgReturn(mCallers != 0, ("mCallers is ZERO!"), (void) 0);
275	--mCallers;
276
277	return;
278	}
279
280	if (mState == InInit \|\| mState == MayUninit \|\| mState == InUninit)
281	{
282	if (mStateChangeThread == RTThreadSelf())
283	{
284	/* Called from the same thread that is doing AutoInitSpan,
285	* AutoMayUninitSpan or AutoUninitSpan: just succeed */
286	return;
287	}
288
289	if (mState == MayUninit \|\| mState == InUninit)
290	{
291	/* the caller is being released after AutoUninitSpan or
292	* AutoMayUninitSpan has begun */
293	AssertMsgReturn(mCallers != 0, ("mCallers is ZERO!"), (void) 0);
294	--mCallers;
295
296	if (mCallers == 0)
297	/* inform the AutoUninitSpan ctor there are no more callers /
298	RTSemEventSignal(mZeroCallersSem);
299
300	return;
301	}
302	}
303
304	AssertMsgFailed (("mState = %d!", mState));
305	}
306
307	////////////////////////////////////////////////////////////////////////////////
308	//
309	// AutoInitSpan methods
310	//
311	////////////////////////////////////////////////////////////////////////////////
312
313	/**
314	* Creates a smart initialization span object that places the object to
315	* InInit state.
316	*
317	* Please see the AutoInitSpan class description for more info.
318	*
319	* @param aObj \|this\| pointer of the managed VirtualBoxBase object whose
320	* init() method is being called.
321	* @param aResult Default initialization result.
322	*/
323	AutoInitSpan::AutoInitSpan(VirtualBoxBase *aObj,
324	Result aResult /* = Failed */)
325	: mObj(aObj),
326	mResult(aResult),
327	mOk(false)
328	{
329	Assert(aObj);
330
331	AutoWriteLock stateLock(mObj->mStateLock COMMA_LOCKVAL_SRC_POS);
332
333	mOk = mObj->mState == VirtualBoxBase::NotReady;
334	AssertReturnVoid (mOk);
335
336	mObj->setState(VirtualBoxBase::InInit);
337	}
338
339	/**
340	* Places the managed VirtualBoxBase object to Ready/Limited state if the
341	* initialization succeeded or partly succeeded, or places it to InitFailed
342	* state and calls the object's uninit() method.
343	*
344	* Please see the AutoInitSpan class description for more info.
345	*/
346	AutoInitSpan::~AutoInitSpan()
347	{
348	/* if the state was other than NotReady, do nothing */
349	if (!mOk)
350	return;
351
352	AutoWriteLock stateLock(mObj->mStateLock COMMA_LOCKVAL_SRC_POS);
353
354	Assert(mObj->mState == VirtualBoxBase::InInit);
355
356	if (mObj->mCallers > 0)
357	{
358	Assert(mObj->mInitUninitWaiters > 0);
359
360	/* We have some pending addCaller() calls on other threads (created
361	* during InInit), signal that InInit is finished and they may go on. */
362	RTSemEventMultiSignal(mObj->mInitUninitSem);
363	}
364
365	if (mResult == Succeeded)
366	{
367	mObj->setState(VirtualBoxBase::Ready);
368	}
369	else
370	if (mResult == Limited)
371	{
372	mObj->setState(VirtualBoxBase::Limited);
373	}
374	else
375	{
376	mObj->setState(VirtualBoxBase::InitFailed);
377	/* leave the lock to prevent nesting when uninit() is called */
378	stateLock.leave();
379	/* call uninit() to let the object uninit itself after failed init() */
380	mObj->uninit();
381	/* Note: the object may no longer exist here (for example, it can call
382	* the destructor in uninit()) */
383	}
384	}
385
386	// AutoReinitSpan methods
387	////////////////////////////////////////////////////////////////////////////////
388
389	/**
390	* Creates a smart re-initialization span object and places the object to
391	* InInit state.
392	*
393	* Please see the AutoInitSpan class description for more info.
394	*
395	* @param aObj \|this\| pointer of the managed VirtualBoxBase object whose
396	* re-initialization method is being called.
397	*/
398	AutoReinitSpan::AutoReinitSpan(VirtualBoxBase *aObj)
399	: mObj(aObj),
400	mSucceeded(false),
401	mOk(false)
402	{
403	Assert(aObj);
404
405	AutoWriteLock stateLock(mObj->mStateLock COMMA_LOCKVAL_SRC_POS);
406
407	mOk = mObj->mState == VirtualBoxBase::Limited;
408	AssertReturnVoid (mOk);
409
410	mObj->setState(VirtualBoxBase::InInit);
411	}
412
413	/**
414	* Places the managed VirtualBoxBase object to Ready state if the
415	* re-initialization succeeded (i.e. #setSucceeded() has been called) or back to
416	* Limited state otherwise.
417	*
418	* Please see the AutoInitSpan class description for more info.
419	*/
420	AutoReinitSpan::~AutoReinitSpan()
421	{
422	/* if the state was other than Limited, do nothing */
423	if (!mOk)
424	return;
425
426	AutoWriteLock stateLock(mObj->mStateLock COMMA_LOCKVAL_SRC_POS);
427
428	Assert(mObj->mState == VirtualBoxBase::InInit);
429
430	if (mObj->mCallers > 0 && mObj->mInitUninitWaiters > 0)
431	{
432	/* We have some pending addCaller() calls on other threads (created
433	* during InInit), signal that InInit is finished and they may go on. */
434	RTSemEventMultiSignal(mObj->mInitUninitSem);
435	}
436
437	if (mSucceeded)
438	{
439	mObj->setState(VirtualBoxBase::Ready);
440	}
441	else
442	{
443	mObj->setState(VirtualBoxBase::Limited);
444	}
445	}
446
447	// AutoUninitSpan methods
448	////////////////////////////////////////////////////////////////////////////////
449
450	/**
451	* Creates a smart uninitialization span object and places this object to
452	* InUninit state.
453	*
454	* Please see the AutoInitSpan class description for more info.
455	*
456	* @note This method blocks the current thread execution until the number of
457	* callers of the managed VirtualBoxBase object drops to zero!
458	*
459	* @param aObj \|this\| pointer of the VirtualBoxBase object whose uninit()
460	* method is being called.
461	*/
462	AutoUninitSpan::AutoUninitSpan(VirtualBoxBase *aObj)
463	: mObj(aObj),
464	mInitFailed(false),
465	mUninitDone(false)
466	{
467	Assert(aObj);
468
469	AutoWriteLock stateLock(mObj->mStateLock COMMA_LOCKVAL_SRC_POS);
470
471	Assert(mObj->mState != VirtualBoxBase::InInit);
472
473	/* Set mUninitDone to \|true\| if this object is already uninitialized
474	* (NotReady) or if another AutoUninitSpan is currently active on some
475	* other thread (InUninit). */
476	mUninitDone = mObj->mState == VirtualBoxBase::NotReady
477	\|\| mObj->mState == VirtualBoxBase::InUninit;
478
479	if (mObj->mState == VirtualBoxBase::InitFailed)
480	{
481	/* we've been called by init() on failure */
482	mInitFailed = true;
483	}
484	else
485	{
486	if (mUninitDone)
487	{
488	/* do nothing if already uninitialized */
489	if (mObj->mState == VirtualBoxBase::NotReady)
490	return;
491
492	/* otherwise, wait until another thread finishes uninitialization.
493	* This is necessary to make sure that when this method returns, the
494	* object is NotReady and therefore can be deleted (for example).
495	* In particular, this is used by
496	* VirtualBoxBaseWithTypedChildrenNEXT::uninitDependentChildren(). */
497
498	/* lazy semaphore creation */
499	if (mObj->mInitUninitSem == NIL_RTSEMEVENTMULTI)
500	{
501	RTSemEventMultiCreate(&mObj->mInitUninitSem);
502	Assert(mObj->mInitUninitWaiters == 0);
503	}
504	++mObj->mInitUninitWaiters;
505
506	LogFlowFunc(("{%p}: Waiting for AutoUninitSpan to finish...\n",
507	mObj));
508
509	stateLock.leave();
510	RTSemEventMultiWait(mObj->mInitUninitSem, RT_INDEFINITE_WAIT);
511	stateLock.enter();
512
513	if (--mObj->mInitUninitWaiters == 0)
514	{
515	/* destroy the semaphore since no more necessary */
516	RTSemEventMultiDestroy(mObj->mInitUninitSem);
517	mObj->mInitUninitSem = NIL_RTSEMEVENTMULTI;
518	}
519
520	return;
521	}
522	}
523
524	/* go to InUninit to prevent from adding new callers */
525	mObj->setState(VirtualBoxBase::InUninit);
526
527	/* wait for already existing callers to drop to zero */
528	if (mObj->mCallers > 0)
529	{
530	/* lazy creation */
531	Assert(mObj->mZeroCallersSem == NIL_RTSEMEVENT);
532	RTSemEventCreate(&mObj->mZeroCallersSem);
533
534	/* wait until remaining callers release the object */
535	LogFlowFunc(("{%p}: Waiting for callers (%d) to drop to zero...\n",
536	mObj, mObj->mCallers));
537
538	stateLock.leave();
539	RTSemEventWait(mObj->mZeroCallersSem, RT_INDEFINITE_WAIT);
540	}
541	}
542
543	/**
544	* Places the managed VirtualBoxBase object to the NotReady state.
545	*/
546	AutoUninitSpan::~AutoUninitSpan()
547	{
548	/* do nothing if already uninitialized */
549	if (mUninitDone)
550	return;
551
552	AutoWriteLock stateLock(mObj->mStateLock COMMA_LOCKVAL_SRC_POS);
553
554	Assert(mObj->mState == VirtualBoxBase::InUninit);
555
556	mObj->setState(VirtualBoxBase::NotReady);
557	}
558
559	// AutoMayUninitSpan methods
560	////////////////////////////////////////////////////////////////////////////////
561
562	/**
563	* Creates a smart initialization span object that places the object to
564	* MayUninit state.
565	*
566	* Please see the AutoMayUninitSpan class description for more info.
567	*
568	* @param aObj \|this\| pointer of the managed VirtualBoxBase object whose
569	* uninit() method to be probably called.
570	*/
571	AutoMayUninitSpan::AutoMayUninitSpan(VirtualBoxBase *aObj)
572	: mObj(aObj),
573	mRC(E_FAIL),
574	mAlreadyInProgress(false),
575	mAcceptUninit (false)
576	{
577	Assert(aObj);
578
579	AutoWriteLock stateLock(mObj->mStateLock COMMA_LOCKVAL_SRC_POS);
580
581	AssertReturnVoid( mObj->mState != VirtualBoxBase::InInit
582	&& mObj->mState != VirtualBoxBase::InUninit);
583
584	switch (mObj->mState)
585	{
586	case VirtualBoxBase::Ready:
587	break;
588	case VirtualBoxBase::MayUninit:
589	/* Nothing to be done if already in MayUninit. */
590	mAlreadyInProgress = true;
591	mRC = S_OK;
592	return;
593	default:
594	/* Abuse mObj->addCaller() to get the extended error info possibly
595	* set by reimplementations of addCaller() and return it to the
596	* caller. Note that this abuse is supposed to be safe because we
597	* should've filtered out all states where addCaller() would do
598	* something else but set error info. */
599	mRC = mObj->addCaller();
600	Assert(FAILED(mRC));
601	return;
602	}
603
604	/* go to MayUninit to cause new callers to wait until we finish */
605	mObj->setState(VirtualBoxBase::MayUninit);
606	mRC = S_OK;
607
608	/* wait for already existing callers to drop to zero */
609	if (mObj->mCallers > 0)
610	{
611	/* lazy creation */
612	Assert(mObj->mZeroCallersSem == NIL_RTSEMEVENT);
613	RTSemEventCreate(&mObj->mZeroCallersSem);
614
615	/* wait until remaining callers release the object */
616	LogFlowFunc(("{%p}: Waiting for callers (%d) to drop to zero...\n",
617	mObj, mObj->mCallers));
618
619	stateLock.leave();
620	RTSemEventWait(mObj->mZeroCallersSem, RT_INDEFINITE_WAIT);
621	}
622	}
623
624	/**
625	* Places the managed VirtualBoxBase object back to Ready state if
626	* #acceptUninit() was not called, or places it to WillUninit state and calls
627	* the object's uninit() method.
628	*
629	* Please see the AutoMayUninitSpan class description for more info.
630	*/
631	AutoMayUninitSpan::~AutoMayUninitSpan()
632	{
633	/* if we did nothing in the constructor, do nothing here */
634	if (mAlreadyInProgress \|\| FAILED(mRC))
635	return;
636
637	AutoWriteLock stateLock(mObj->mStateLock COMMA_LOCKVAL_SRC_POS);
638
639	Assert(mObj->mState == VirtualBoxBase::MayUninit);
640
641	if (mObj->mCallers > 0)
642	{
643	Assert(mObj->mInitUninitWaiters > 0);
644
645	/* We have some pending addCaller() calls on other threads made after
646	* going to during MayUnit, signal that MayUnit is finished and they may
647	* go on. */
648	RTSemEventMultiSignal(mObj->mInitUninitSem);
649	}
650
651	if (!mAcceptUninit)
652	{
653	mObj->setState(VirtualBoxBase::Ready);
654	}
655	else
656	{
657	mObj->setState(VirtualBoxBase::WillUninit);
658	/* leave the lock to prevent nesting when uninit() is called */
659	stateLock.leave();
660	/* call uninit() to let the object uninit itself */
661	mObj->uninit();
662	/* Note: the object may no longer exist here (for example, it can call
663	* the destructor in uninit()) */
664	}
665	}
666
667	////////////////////////////////////////////////////////////////////////////////
668	//
669	// VirtualBoxBase
670	//
671	////////////////////////////////////////////////////////////////////////////////
672
673	/**
674	* Translates the given text string according to the currently installed
675	* translation table and current context. The current context is determined
676	* by the context parameter. Additionally, a comment to the source text
677	* string text can be given. This comment (which is NULL by default)
678	* is helpful in situations where it is necessary to distinguish between
679	* two or more semantically different roles of the same source text in the
680	* same context.
681	*
682	* @param context the context of the translation (can be NULL
683	* to indicate the global context)
684	* @param sourceText the string to translate
685	* @param comment the comment to the string (NULL means no comment)
686	*
687	* @return
688	* the translated version of the source string in UTF-8 encoding,
689	* or the source string itself if the translation is not found
690	* in the given context.
691	*/
692	// static
693	const char VirtualBoxBase::translate (const char /* context /, const char sourceText,
694	const char * /* comment */)
695	{
696	#if 0
697	Log(("VirtualBoxBase::translate:\n"
698	" context={%s}\n"
699	" sourceT={%s}\n"
700	" comment={%s}\n",
701	context, sourceText, comment));
702	#endif
703
704	/// @todo (dmik) incorporate Qt translation file parsing and lookup
705	return sourceText;
706	}
707
708	////////////////////////////////////////////////////////////////////////////////
709	//
710	// VirtualBoxSupportTranslationBase
711	//
712	////////////////////////////////////////////////////////////////////////////////
713
714	/**
715	* Modifies the given argument so that it will contain only a class name
716	* (null-terminated). The argument must point to a <b>non-constant</b>
717	* string containing a valid value, as it is generated by the
718	* __PRETTY_FUNCTION__ built-in macro of the GCC compiler, or by the
719	* __FUNCTION__ macro of any other compiler.
720	*
721	* The function assumes that the macro is used within the member of the
722	* class derived from the VirtualBoxSupportTranslation<> template.
723	*
724	* @param prettyFunctionName string to modify
725	* @return
726	* true on success and false otherwise
727	*/
728	bool VirtualBoxSupportTranslationBase::cutClassNameFrom__PRETTY_FUNCTION__ (char *fn)
729	{
730	Assert(fn);
731	if (!fn)
732	return false;
733
734	#if defined (__GNUC__)
735
736	// the format is like:
737	// VirtualBoxSupportTranslation<C>::VirtualBoxSupportTranslation() [with C = VirtualBox]
738
739	#define START " = "
740	#define END "]"
741
742	#elif defined (_MSC_VER)
743
744	// the format is like:
745	// VirtualBoxSupportTranslation<class VirtualBox>::__ctor
746
747	#define START "<class "
748	#define END ">::"
749
750	#endif
751
752	char *start = strstr(fn, START);
753	Assert(start);
754	if (start)
755	{
756	start += sizeof(START) - 1;
757	char *end = strstr(start, END);
758	Assert(end && (end > start));
759	if (end && (end > start))
760	{
761	size_t len = end - start;
762	memmove(fn, start, len);
763	fn[len] = 0;
764	return true;
765	}
766	}
767
768	#undef END
769	#undef START
770
771	return false;
772	}
773
774	////////////////////////////////////////////////////////////////////////////////
775	//
776	// VirtualBoxSupportErrorInfoImplBase
777	//
778	////////////////////////////////////////////////////////////////////////////////
779
780	RTTLS VirtualBoxSupportErrorInfoImplBase::MultiResult::sCounter = NIL_RTTLS;
781
782	void VirtualBoxSupportErrorInfoImplBase::MultiResult::init()
783	{
784	if (sCounter == NIL_RTTLS)
785	{
786	sCounter = RTTlsAlloc();
787	AssertReturnVoid (sCounter != NIL_RTTLS);
788	}
789
790	uintptr_t counter = (uintptr_t) RTTlsGet (sCounter);
791	++ counter;
792	RTTlsSet (sCounter, (void *) counter);
793	}
794
795	VirtualBoxSupportErrorInfoImplBase::MultiResult::~MultiResult()
796	{
797	uintptr_t counter = (uintptr_t) RTTlsGet (sCounter);
798	AssertReturnVoid (counter != 0);
799	-- counter;
800	RTTlsSet (sCounter, (void *) counter);
801	}
802
803	/**
804	* Sets error info for the current thread. This is an internal function that
805	* gets eventually called by all public variants. If @a aWarning is
806	* @c true, then the highest (31) bit in the @a aResultCode value which
807	* indicates the error severity is reset to zero to make sure the receiver will
808	* recognize that the created error info object represents a warning rather
809	* than an error.
810	*/
811	/* static */
812	HRESULT VirtualBoxSupportErrorInfoImplBase::setErrorInternal (
813	HRESULT aResultCode, const GUID &aIID,
814	const Bstr &aComponent, const Bstr &aText,
815	bool aWarning, bool aLogIt)
816	{
817	/* whether multi-error mode is turned on */
818	bool preserve = ((uintptr_t) RTTlsGet (MultiResult::sCounter)) > 0;
819
820	if (aLogIt)
821	LogRel (("ERROR [COM]: aRC=%Rhrc (%#08x) aIID={%RTuuid} aComponent={%ls} aText={%ls} "
822	"aWarning=%RTbool, preserve=%RTbool\n",
823	aResultCode, aResultCode, &aIID, aComponent.raw(), aText.raw(), aWarning,
824	preserve));
825
826	/* these are mandatory, others -- not */
827	AssertReturn((!aWarning && FAILED(aResultCode)) \|\|
828	(aWarning && aResultCode != S_OK),
829	E_FAIL);
830	AssertReturn(!aText.isEmpty(), E_FAIL);
831
832	/* reset the error severity bit if it's a warning */
833	if (aWarning)
834	aResultCode &= ~0x80000000;
835
836	HRESULT rc = S_OK;
837
838	do
839	{
840	ComObjPtr<VirtualBoxErrorInfo> info;
841	rc = info.createObject();
842	if (FAILED(rc)) break;
843
844	#if !defined (VBOX_WITH_XPCOM)
845
846	ComPtr<IVirtualBoxErrorInfo> curInfo;
847	if (preserve)
848	{
849	/* get the current error info if any */
850	ComPtr<IErrorInfo> err;
851	rc = ::GetErrorInfo (0, err.asOutParam());
852	if (FAILED(rc)) break;
853	rc = err.queryInterfaceTo(curInfo.asOutParam());
854	if (FAILED(rc))
855	{
856	/* create a IVirtualBoxErrorInfo wrapper for the native
857	* IErrorInfo object */
858	ComObjPtr<VirtualBoxErrorInfo> wrapper;
859	rc = wrapper.createObject();
860	if (SUCCEEDED(rc))
861	{
862	rc = wrapper->init (err);
863	if (SUCCEEDED(rc))
864	curInfo = wrapper;
865	}
866	}
867	}
868	/* On failure, curInfo will stay null */
869	Assert(SUCCEEDED(rc) \|\| curInfo.isNull());
870
871	/* set the current error info and preserve the previous one if any */
872	rc = info->init (aResultCode, aIID, aComponent, aText, curInfo);
873	if (FAILED(rc)) break;
874
875	ComPtr<IErrorInfo> err;
876	rc = info.queryInterfaceTo(err.asOutParam());
877	if (SUCCEEDED(rc))
878	rc = ::SetErrorInfo (0, err);
879
880	#else // !defined (VBOX_WITH_XPCOM)
881
882	nsCOMPtr <nsIExceptionService> es;
883	es = do_GetService (NS_EXCEPTIONSERVICE_CONTRACTID, &rc);
884	if (NS_SUCCEEDED(rc))
885	{
886	nsCOMPtr <nsIExceptionManager> em;
887	rc = es->GetCurrentExceptionManager (getter_AddRefs (em));
888	if (FAILED(rc)) break;
889
890	ComPtr<IVirtualBoxErrorInfo> curInfo;
891	if (preserve)
892	{
893	/* get the current error info if any */
894	ComPtr<nsIException> ex;
895	rc = em->GetCurrentException (ex.asOutParam());
896	if (FAILED(rc)) break;
897	rc = ex.queryInterfaceTo(curInfo.asOutParam());
898	if (FAILED(rc))
899	{
900	/* create a IVirtualBoxErrorInfo wrapper for the native
901	* nsIException object */
902	ComObjPtr<VirtualBoxErrorInfo> wrapper;
903	rc = wrapper.createObject();
904	if (SUCCEEDED(rc))
905	{
906	rc = wrapper->init (ex);
907	if (SUCCEEDED(rc))
908	curInfo = wrapper;
909	}
910	}
911	}
912	/* On failure, curInfo will stay null */
913	Assert(SUCCEEDED(rc) \|\| curInfo.isNull());
914
915	/* set the current error info and preserve the previous one if any */
916	rc = info->init (aResultCode, aIID, aComponent, aText, curInfo);
917	if (FAILED(rc)) break;
918
919	ComPtr<nsIException> ex;
920	rc = info.queryInterfaceTo(ex.asOutParam());
921	if (SUCCEEDED(rc))
922	rc = em->SetCurrentException (ex);
923	}
924	else if (rc == NS_ERROR_UNEXPECTED)
925	{
926	/*
927	* It is possible that setError() is being called by the object
928	* after the XPCOM shutdown sequence has been initiated
929	* (for example, when XPCOM releases all instances it internally
930	* references, which can cause object's FinalConstruct() and then
931	* uninit()). In this case, do_GetService() above will return
932	* NS_ERROR_UNEXPECTED and it doesn't actually make sense to
933	* set the exception (nobody will be able to read it).
934	*/
935	LogWarningFunc (("Will not set an exception because "
936	"nsIExceptionService is not available "
937	"(NS_ERROR_UNEXPECTED). "
938	"XPCOM is being shutdown?\n"));
939	rc = NS_OK;
940	}
941
942	#endif // !defined (VBOX_WITH_XPCOM)
943	}
944	while (0);
945
946	AssertComRC (rc);
947
948	return SUCCEEDED(rc) ? aResultCode : rc;
949	}
950
951
952	/**
953	* Uninitializes all dependent children registered on this object with
954	* #addDependentChild().
955	*
956	* Must be called from within the AutoUninitSpan (i.e.
957	* typically from this object's uninit() method) to uninitialize children
958	* before this object goes out of service and becomes unusable.
959	*
960	* Note that this method will call uninit() methods of child objects. If
961	* these methods need to call the parent object during uninitialization,
962	* #uninitDependentChildren() must be called before the relevant part of the
963	* parent is uninitialized: usually at the begnning of the parent
964	* uninitialization sequence.
965	*
966	* Keep in mind that the uninitialized child objects may be no longer available
967	* (i.e. may be deleted) after this method returns.
968	*
969	* @note Locks #childrenLock() for writing.
970	*
971	* @note May lock something else through the called children.
972	*/
973	void VirtualBoxBaseWithChildrenNEXT::uninitDependentChildren()
974	{
975	AutoCaller autoCaller(this);
976
977	/* sanity */
978	AssertReturnVoid (autoCaller.state() == InUninit \|\|
979	autoCaller.state() == InInit);
980
981	AutoWriteLock chLock(childrenLock() COMMA_LOCKVAL_SRC_POS);
982
983	size_t count = mDependentChildren.size();
984
985	while (count != 0)
986	{
987	/* strongly reference the weak child from the map to make sure it won't
988	* be deleted while we've released the lock */
989	DependentChildren::iterator it = mDependentChildren.begin();
990	ComPtr<IUnknown> unk = it->first;
991	Assert(!unk.isNull());
992
993	VirtualBoxBase *child = it->second;
994
995	/* release the lock to let children stuck in removeDependentChild() go
996	* on (otherwise we'll deadlock in uninit() */
997	chLock.leave();
998
999	/* Note that if child->uninit() happens to be called on another
1000	* thread right before us and is not yet finished, the second
1001	* uninit() call will wait until the first one has done so
1002	* (thanks to AutoUninitSpan). */
1003	Assert(child);
1004	if (child)
1005	child->uninit();
1006
1007	chLock.enter();
1008
1009	/* uninit() is guaranteed to be done here so the child must be already
1010	* deleted from the list by removeDependentChild() called from there.
1011	* Do some checks to avoid endless loops when the user is forgetful */
1012	-- count;
1013	Assert(count == mDependentChildren.size());
1014	if (count != mDependentChildren.size())
1015	mDependentChildren.erase (it);
1016
1017	Assert(count == mDependentChildren.size());
1018	}
1019	}
1020
1021	/**
1022	* Returns a pointer to the dependent child (registered using
1023	* #addDependentChild()) corresponding to the given interface pointer or NULL if
1024	* the given pointer is unrelated.
1025	*
1026	* The relation is checked by using the given interface pointer as a key in the
1027	* map of dependent children.
1028	*
1029	* Note that ComPtr<IUnknown> is used as an argument instead of IUnknown * in
1030	* order to guarantee IUnknown identity and disambiguation by doing
1031	* QueryInterface (IUnknown) rather than a regular C cast.
1032	*
1033	* @param aUnk Pointer to map to the dependent child object.
1034	* @return Pointer to the dependent VirtualBoxBase child object.
1035	*
1036	* @note Locks #childrenLock() for reading.
1037	*/
1038	VirtualBoxBase* VirtualBoxBaseWithChildrenNEXT::getDependentChild(const ComPtr<IUnknown> &aUnk)
1039	{
1040	AssertReturn(!aUnk.isNull(), NULL);
1041
1042	AutoCaller autoCaller(this);
1043
1044	/* return NULL if uninitDependentChildren() is in action */
1045	if (autoCaller.state() == InUninit)
1046	return NULL;
1047
1048	AutoReadLock alock(childrenLock() COMMA_LOCKVAL_SRC_POS);
1049
1050	DependentChildren::const_iterator it = mDependentChildren.find (aUnk);
1051	if (it == mDependentChildren.end())
1052	return NULL;
1053
1054	return (*it).second;
1055	}
1056
1057	/** Helper for addDependentChild(). */
1058	void VirtualBoxBaseWithChildrenNEXT::doAddDependentChild(IUnknown *aUnk,
1059	VirtualBoxBase *aChild)
1060	{
1061	AssertReturnVoid (aUnk != NULL);
1062	AssertReturnVoid (aChild != NULL);
1063
1064	AutoCaller autoCaller(this);
1065
1066	/* sanity */
1067	AssertReturnVoid (autoCaller.state() == InInit \|\|
1068	autoCaller.state() == Ready \|\|
1069	autoCaller.state() == Limited);
1070
1071	AutoWriteLock alock(childrenLock() COMMA_LOCKVAL_SRC_POS);
1072
1073	std::pair <DependentChildren::iterator, bool> result =
1074	mDependentChildren.insert (DependentChildren::value_type (aUnk, aChild));
1075	AssertMsg (result.second, ("Failed to insert child %p to the map\n", aUnk));
1076	}
1077
1078	/** Helper for removeDependentChild(). */
1079	void VirtualBoxBaseWithChildrenNEXT::doRemoveDependentChild (IUnknown *aUnk)
1080	{
1081	AssertReturnVoid (aUnk);
1082
1083	AutoCaller autoCaller(this);
1084
1085	/* sanity */
1086	AssertReturnVoid (autoCaller.state() == InUninit \|\|
1087	autoCaller.state() == InInit \|\|
1088	autoCaller.state() == Ready \|\|
1089	autoCaller.state() == Limited);
1090
1091	AutoWriteLock alock(childrenLock() COMMA_LOCKVAL_SRC_POS);
1092
1093	DependentChildren::size_type result = mDependentChildren.erase (aUnk);
1094	AssertMsg (result == 1, ("Failed to remove child %p from the map\n", aUnk));
1095	NOREF (result);
1096	}
1097
1098	/* vi: set tabstop=4 shiftwidth=4 expandtab: */

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source: vbox/trunk/src/VBox/Main/VirtualBoxBase.cpp@ 26254

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