VirtualBoxBase.cpp@ 40685

Last change on this file since 40685 was 40257, checked in by vboxsync, 13 years ago
Main/Medium: rework locking scheme to solve lock order violations and long GUI start up time caused by too much locking Main/all: Remove the enter and leave methods from write locks, they cause hard to find locking problems. Better solve them explicitly.
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File size: 33.4 KB

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1	/* $Id: VirtualBoxBase.cpp 40257 2012-02-27 09:25:12Z vboxsync $ */
2
3	/** @file
4	*
5	* VirtualBox COM base classes implementation
6	*/
7
8	/*
9	* Copyright (C) 2006-2012 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 "VBox/com/ErrorInfo.h"
38	#include "VBox/com/MultiResult.h"
39
40	////////////////////////////////////////////////////////////////////////////////
41	//
42	// VirtualBoxBase
43	//
44	////////////////////////////////////////////////////////////////////////////////
45
46	VirtualBoxBase::VirtualBoxBase()
47	: mStateLock(LOCKCLASS_OBJECTSTATE)
48	{
49	mState = NotReady;
50	mStateChangeThread = NIL_RTTHREAD;
51	mCallers = 0;
52	mZeroCallersSem = NIL_RTSEMEVENT;
53	mInitUninitSem = NIL_RTSEMEVENTMULTI;
54	mInitUninitWaiters = 0;
55	mObjectLock = NULL;
56	}
57
58	VirtualBoxBase::~VirtualBoxBase()
59	{
60	if (mObjectLock)
61	delete mObjectLock;
62	Assert(mInitUninitWaiters == 0);
63	Assert(mInitUninitSem == NIL_RTSEMEVENTMULTI);
64	if (mZeroCallersSem != NIL_RTSEMEVENT)
65	RTSemEventDestroy (mZeroCallersSem);
66	mCallers = 0;
67	mStateChangeThread = NIL_RTTHREAD;
68	mState = NotReady;
69	}
70
71	/**
72	* This virtual method returns an RWLockHandle that can be used to
73	* protect instance data. This RWLockHandle is generally referred to
74	* as the "object lock"; its locking class (for lock order validation)
75	* must be returned by another virtual method, getLockingClass(), which
76	* by default returns LOCKCLASS_OTHEROBJECT but is overridden by several
77	* subclasses such as VirtualBox, Host, Machine and others.
78	*
79	* On the first call this method lazily creates the RWLockHandle.
80	*
81	* @return
82	*/
83	/* virtual */
84	RWLockHandle *VirtualBoxBase::lockHandle() const
85	{
86	/* lazy initialization */
87	if (RT_UNLIKELY(!mObjectLock))
88	{
89	AssertCompile (sizeof (RWLockHandle ) == sizeof (void ));
90
91	// getLockingClass() is overridden by many subclasses to return
92	// one of the locking classes listed at the top of AutoLock.h
93	RWLockHandle *objLock = new RWLockHandle(getLockingClass());
94	if (!ASMAtomicCmpXchgPtr(&mObjectLock, objLock, NULL))
95	{
96	delete objLock;
97	objLock = ASMAtomicReadPtrT(&mObjectLock, RWLockHandle *);
98	}
99	return objLock;
100	}
101	return mObjectLock;
102	}
103
104	/**
105	* Increments the number of calls to this object by one.
106	*
107	* After this method succeeds, it is guaranteed that the object will remain
108	* in the Ready (or in the Limited) state at least until #releaseCaller() is
109	* called.
110	*
111	* This method is intended to mark the beginning of sections of code within
112	* methods of COM objects that depend on the readiness (Ready) state. The
113	* Ready state is a primary "ready to serve" state. Usually all code that
114	* works with component's data depends on it. On practice, this means that
115	* almost every public method, setter or getter of the object should add
116	* itself as an object's caller at the very beginning, to protect from an
117	* unexpected uninitialization that may happen on a different thread.
118	*
119	* Besides the Ready state denoting that the object is fully functional,
120	* there is a special Limited state. The Limited state means that the object
121	* is still functional, but its functionality is limited to some degree, so
122	* not all operations are possible. The @a aLimited argument to this method
123	* determines whether the caller represents this limited functionality or
124	* not.
125	*
126	* This method succeeds (and increments the number of callers) only if the
127	* current object's state is Ready. Otherwise, it will return E_ACCESSDENIED
128	* to indicate that the object is not operational. There are two exceptions
129	* from this rule:
130	* <ol>
131	* <li>If the @a aLimited argument is \|true\|, then this method will also
132	* succeed if the object's state is Limited (or Ready, of course).
133	* </li>
134	* <li>If this method is called from the same thread that placed
135	* the object to InInit or InUninit state (i.e. either from within the
136	* AutoInitSpan or AutoUninitSpan scope), it will succeed as well (but
137	* will not increase the number of callers).
138	* </li>
139	* </ol>
140	*
141	* Normally, calling addCaller() never blocks. However, if this method is
142	* called by a thread created from within the AutoInitSpan scope and this
143	* scope is still active (i.e. the object state is InInit), it will block
144	* until the AutoInitSpan destructor signals that it has finished
145	* initialization.
146	*
147	* When this method returns a failure, the caller must not use the object
148	* and should return the failed result code to its own caller.
149	*
150	* @param aState Where to store the current object's state (can be
151	* used in overridden methods to determine the cause of
152	* the failure).
153	* @param aLimited \|true\| to add a limited caller.
154	*
155	* @return S_OK on success or E_ACCESSDENIED on failure.
156	*
157	* @note It is preferable to use the #addLimitedCaller() rather than
158	* calling this method with @a aLimited = \|true\|, for better
159	* self-descriptiveness.
160	*
161	* @sa #addLimitedCaller()
162	* @sa #releaseCaller()
163	*/
164	HRESULT VirtualBoxBase::addCaller(State aState / = NULL */,
165	bool aLimited /* = false */)
166	{
167	AutoWriteLock stateLock(mStateLock COMMA_LOCKVAL_SRC_POS);
168
169	HRESULT rc = E_ACCESSDENIED;
170
171	if (mState == Ready \|\| (aLimited && mState == Limited))
172	{
173	/* if Ready or allows Limited, increase the number of callers */
174	++ mCallers;
175	rc = S_OK;
176	}
177	else
178	if (mState == InInit \|\| mState == InUninit)
179	{
180	if (mStateChangeThread == RTThreadSelf())
181	{
182	/* Called from the same thread that is doing AutoInitSpan or
183	* AutoUninitSpan, just succeed */
184	rc = S_OK;
185	}
186	else if (mState == InInit)
187	{
188	/* addCaller() is called by a "child" thread while the "parent"
189	* thread is still doing AutoInitSpan/AutoReinitSpan, so wait for
190	* the state to become either Ready/Limited or InitFailed (in
191	* case of init failure).
192	*
193	* Note that we increase the number of callers anyway -- to
194	* prevent AutoUninitSpan from early completion if we are
195	* still not scheduled to pick up the posted semaphore when
196	* uninit() is called.
197	*/
198	++ mCallers;
199
200	/* lazy semaphore creation */
201	if (mInitUninitSem == NIL_RTSEMEVENTMULTI)
202	{
203	RTSemEventMultiCreate (&mInitUninitSem);
204	Assert(mInitUninitWaiters == 0);
205	}
206
207	++ mInitUninitWaiters;
208
209	LogFlowThisFunc(("Waiting for AutoInitSpan/AutoReinitSpan to finish...\n"));
210
211	stateLock.release();
212	RTSemEventMultiWait (mInitUninitSem, RT_INDEFINITE_WAIT);
213	stateLock.acquire();
214
215	if (-- mInitUninitWaiters == 0)
216	{
217	/* destroy the semaphore since no more necessary */
218	RTSemEventMultiDestroy (mInitUninitSem);
219	mInitUninitSem = NIL_RTSEMEVENTMULTI;
220	}
221
222	if (mState == Ready \|\| (aLimited && mState == Limited))
223	rc = S_OK;
224	else
225	{
226	Assert(mCallers != 0);
227	-- mCallers;
228	if (mCallers == 0 && mState == InUninit)
229	{
230	/* inform AutoUninitSpan ctor there are no more callers */
231	RTSemEventSignal(mZeroCallersSem);
232	}
233	}
234	}
235	}
236
237	if (aState)
238	*aState = mState;
239
240	if (FAILED(rc))
241	{
242	if (mState == VirtualBoxBase::Limited)
243	rc = setError(rc, "The object functionality is limited");
244	else
245	rc = setError(rc, "The object is not ready");
246	}
247
248	return rc;
249	}
250
251	/**
252	* Decreases the number of calls to this object by one.
253	*
254	* Must be called after every #addCaller() or #addLimitedCaller() when
255	* protecting the object from uninitialization is no more necessary.
256	*/
257	void VirtualBoxBase::releaseCaller()
258	{
259	AutoWriteLock stateLock(mStateLock COMMA_LOCKVAL_SRC_POS);
260
261	if (mState == Ready \|\| mState == Limited)
262	{
263	/* if Ready or Limited, decrease the number of callers */
264	AssertMsgReturn(mCallers != 0, ("mCallers is ZERO!"), (void) 0);
265	--mCallers;
266
267	return;
268	}
269
270	if (mState == InInit \|\| mState == InUninit)
271	{
272	if (mStateChangeThread == RTThreadSelf())
273	{
274	/* Called from the same thread that is doing AutoInitSpan or
275	* AutoUninitSpan: just succeed */
276	return;
277	}
278
279	if (mState == InUninit)
280	{
281	/* the caller is being released after AutoUninitSpan has begun */
282	AssertMsgReturn(mCallers != 0, ("mCallers is ZERO!"), (void) 0);
283	--mCallers;
284
285	if (mCallers == 0)
286	/* inform the AutoUninitSpan ctor there are no more callers /
287	RTSemEventSignal(mZeroCallersSem);
288
289	return;
290	}
291	}
292
293	AssertMsgFailed (("mState = %d!", mState));
294	}
295
296	/**
297	* Sets error info for the current thread. This is an internal function that
298	* gets eventually called by all public variants. If @a aWarning is
299	* @c true, then the highest (31) bit in the @a aResultCode value which
300	* indicates the error severity is reset to zero to make sure the receiver will
301	* recognize that the created error info object represents a warning rather
302	* than an error.
303	*/
304	/* static */
305	HRESULT VirtualBoxBase::setErrorInternal(HRESULT aResultCode,
306	const GUID &aIID,
307	const char *pcszComponent,
308	Utf8Str aText,
309	bool aWarning,
310	bool aLogIt)
311	{
312	/* whether multi-error mode is turned on */
313	bool preserve = MultiResult::isMultiEnabled();
314
315	if (aLogIt)
316	LogRel(("%s [COM]: aRC=%Rhrc (%#08x) aIID={%RTuuid} aComponent={%s} aText={%s}, preserve=%RTbool\n",
317	aWarning ? "WARNING" : "ERROR",
318	aResultCode,
319	aResultCode,
320	&aIID,
321	pcszComponent,
322	aText.c_str(),
323	aWarning,
324	preserve));
325
326	/* these are mandatory, others -- not */
327	AssertReturn((!aWarning && FAILED(aResultCode)) \|\|
328	(aWarning && aResultCode != S_OK),
329	E_FAIL);
330
331	/* reset the error severity bit if it's a warning */
332	if (aWarning)
333	aResultCode &= ~0x80000000;
334
335	HRESULT rc = S_OK;
336
337	if (aText.isEmpty())
338	{
339	/* Some default info */
340	switch (aResultCode)
341	{
342	case E_INVALIDARG: aText = "A parameter has an invalid value"; break;
343	case E_POINTER: aText = "A parameter is an invalid pointer"; break;
344	case E_UNEXPECTED: aText = "The result of the operation is unexpected"; break;
345	case E_ACCESSDENIED: aText = "The access to an object is not allowed"; break;
346	case E_OUTOFMEMORY: aText = "The allocation of new memory failed"; break;
347	case E_NOTIMPL: aText = "The requested operation is not implemented"; break;
348	case E_NOINTERFACE: aText = "The requested interface is not implemented"; break;
349	case E_FAIL: aText = "A general error occurred"; break;
350	case E_ABORT: aText = "The operation was canceled"; break;
351	case VBOX_E_OBJECT_NOT_FOUND: aText = "Object corresponding to the supplied arguments does not exist"; break;
352	case VBOX_E_INVALID_VM_STATE: aText = "Current virtual machine state prevents the operation"; break;
353	case VBOX_E_VM_ERROR: aText = "Virtual machine error occurred attempting the operation"; break;
354	case VBOX_E_FILE_ERROR: aText = "File not accessible or erroneous file contents"; break;
355	case VBOX_E_IPRT_ERROR: aText = "Runtime subsystem error"; break;
356	case VBOX_E_PDM_ERROR: aText = "Pluggable Device Manager error"; break;
357	case VBOX_E_INVALID_OBJECT_STATE: aText = "Current object state prohibits operation"; break;
358	case VBOX_E_HOST_ERROR: aText = "Host operating system related error"; break;
359	case VBOX_E_NOT_SUPPORTED: aText = "Requested operation is not supported"; break;
360	case VBOX_E_XML_ERROR: aText = "Invalid XML found"; break;
361	case VBOX_E_INVALID_SESSION_STATE: aText = "Current session state prohibits operation"; break;
362	case VBOX_E_OBJECT_IN_USE: aText = "Object being in use prohibits operation"; break;
363	default: aText = "Unknown error"; break;
364	}
365	}
366
367	do
368	{
369	ComObjPtr<VirtualBoxErrorInfo> info;
370	rc = info.createObject();
371	if (FAILED(rc)) break;
372
373	#if !defined (VBOX_WITH_XPCOM)
374
375	ComPtr<IVirtualBoxErrorInfo> curInfo;
376	if (preserve)
377	{
378	/* get the current error info if any */
379	ComPtr<IErrorInfo> err;
380	rc = ::GetErrorInfo (0, err.asOutParam());
381	if (FAILED(rc)) break;
382	rc = err.queryInterfaceTo(curInfo.asOutParam());
383	if (FAILED(rc))
384	{
385	/* create a IVirtualBoxErrorInfo wrapper for the native
386	* IErrorInfo object */
387	ComObjPtr<VirtualBoxErrorInfo> wrapper;
388	rc = wrapper.createObject();
389	if (SUCCEEDED(rc))
390	{
391	rc = wrapper->init (err);
392	if (SUCCEEDED(rc))
393	curInfo = wrapper;
394	}
395	}
396	}
397	/* On failure, curInfo will stay null */
398	Assert(SUCCEEDED(rc) \|\| curInfo.isNull());
399
400	/* set the current error info and preserve the previous one if any */
401	rc = info->init(aResultCode, aIID, pcszComponent, aText, curInfo);
402	if (FAILED(rc)) break;
403
404	ComPtr<IErrorInfo> err;
405	rc = info.queryInterfaceTo(err.asOutParam());
406	if (SUCCEEDED(rc))
407	rc = ::SetErrorInfo (0, err);
408
409	#else // !defined (VBOX_WITH_XPCOM)
410
411	nsCOMPtr <nsIExceptionService> es;
412	es = do_GetService (NS_EXCEPTIONSERVICE_CONTRACTID, &rc);
413	if (NS_SUCCEEDED(rc))
414	{
415	nsCOMPtr <nsIExceptionManager> em;
416	rc = es->GetCurrentExceptionManager (getter_AddRefs (em));
417	if (FAILED(rc)) break;
418
419	ComPtr<IVirtualBoxErrorInfo> curInfo;
420	if (preserve)
421	{
422	/* get the current error info if any */
423	ComPtr<nsIException> ex;
424	rc = em->GetCurrentException (ex.asOutParam());
425	if (FAILED(rc)) break;
426	rc = ex.queryInterfaceTo(curInfo.asOutParam());
427	if (FAILED(rc))
428	{
429	/* create a IVirtualBoxErrorInfo wrapper for the native
430	* nsIException object */
431	ComObjPtr<VirtualBoxErrorInfo> wrapper;
432	rc = wrapper.createObject();
433	if (SUCCEEDED(rc))
434	{
435	rc = wrapper->init (ex);
436	if (SUCCEEDED(rc))
437	curInfo = wrapper;
438	}
439	}
440	}
441	/* On failure, curInfo will stay null */
442	Assert(SUCCEEDED(rc) \|\| curInfo.isNull());
443
444	/* set the current error info and preserve the previous one if any */
445	rc = info->init(aResultCode, aIID, pcszComponent, Bstr(aText), curInfo);
446	if (FAILED(rc)) break;
447
448	ComPtr<nsIException> ex;
449	rc = info.queryInterfaceTo(ex.asOutParam());
450	if (SUCCEEDED(rc))
451	rc = em->SetCurrentException (ex);
452	}
453	else if (rc == NS_ERROR_UNEXPECTED)
454	{
455	/*
456	* It is possible that setError() is being called by the object
457	* after the XPCOM shutdown sequence has been initiated
458	* (for example, when XPCOM releases all instances it internally
459	* references, which can cause object's FinalConstruct() and then
460	* uninit()). In this case, do_GetService() above will return
461	* NS_ERROR_UNEXPECTED and it doesn't actually make sense to
462	* set the exception (nobody will be able to read it).
463	*/
464	LogWarningFunc(("Will not set an exception because nsIExceptionService is not available "
465	"(NS_ERROR_UNEXPECTED). XPCOM is being shutdown?\n"));
466	rc = NS_OK;
467	}
468
469	#endif // !defined (VBOX_WITH_XPCOM)
470	}
471	while (0);
472
473	AssertComRC (rc);
474
475	return SUCCEEDED(rc) ? aResultCode : rc;
476	}
477
478	/**
479	* Shortcut instance method to calling the static setErrorInternal with the
480	* class interface ID and component name inserted correctly. This uses the
481	* virtual getClassIID() and getComponentName() methods which are automatically
482	* defined by the VIRTUALBOXBASE_ADD_ERRORINFO_SUPPORT macro.
483	* @param aResultCode
484	* @param pcsz
485	* @return
486	*/
487	HRESULT VirtualBoxBase::setError(HRESULT aResultCode)
488	{
489	return setErrorInternal(aResultCode,
490	this->getClassIID(),
491	this->getComponentName(),
492	"",
493	false /* aWarning */,
494	true /* aLogIt */);
495	}
496
497	/**
498	* Shortcut instance method to calling the static setErrorInternal with the
499	* class interface ID and component name inserted correctly. This uses the
500	* virtual getClassIID() and getComponentName() methods which are automatically
501	* defined by the VIRTUALBOXBASE_ADD_ERRORINFO_SUPPORT macro.
502	* @param aResultCode
503	* @return
504	*/
505	HRESULT VirtualBoxBase::setError(HRESULT aResultCode, const char *pcsz, ...)
506	{
507	va_list args;
508	va_start(args, pcsz);
509	HRESULT rc = setErrorInternal(aResultCode,
510	this->getClassIID(),
511	this->getComponentName(),
512	Utf8Str(pcsz, args),
513	false /* aWarning */,
514	true /* aLogIt */);
515	va_end(args);
516	return rc;
517	}
518
519	/**
520	* Shortcut instance method to calling the static setErrorInternal with the
521	* class interface ID and component name inserted correctly. This uses the
522	* virtual getClassIID() and getComponentName() methods which are automatically
523	* defined by the VIRTUALBOXBASE_ADD_ERRORINFO_SUPPORT macro.
524	* @param ei
525	* @return
526	*/
527	HRESULT VirtualBoxBase::setError(const com::ErrorInfo &ei)
528	{
529	/* whether multi-error mode is turned on */
530	bool preserve = MultiResult::isMultiEnabled();
531
532	HRESULT rc = S_OK;
533
534	do
535	{
536	ComObjPtr<VirtualBoxErrorInfo> info;
537	rc = info.createObject();
538	if (FAILED(rc)) break;
539
540	#if !defined (VBOX_WITH_XPCOM)
541
542	ComPtr<IVirtualBoxErrorInfo> curInfo;
543	if (preserve)
544	{
545	/* get the current error info if any */
546	ComPtr<IErrorInfo> err;
547	rc = ::GetErrorInfo (0, err.asOutParam());
548	if (FAILED(rc)) break;
549	rc = err.queryInterfaceTo(curInfo.asOutParam());
550	if (FAILED(rc))
551	{
552	/* create a IVirtualBoxErrorInfo wrapper for the native
553	* IErrorInfo object */
554	ComObjPtr<VirtualBoxErrorInfo> wrapper;
555	rc = wrapper.createObject();
556	if (SUCCEEDED(rc))
557	{
558	rc = wrapper->init (err);
559	if (SUCCEEDED(rc))
560	curInfo = wrapper;
561	}
562	}
563	}
564	/* On failure, curInfo will stay null */
565	Assert(SUCCEEDED(rc) \|\| curInfo.isNull());
566
567	/* set the current error info and preserve the previous one if any */
568	rc = info->init(ei, curInfo);
569	if (FAILED(rc)) break;
570
571	ComPtr<IErrorInfo> err;
572	rc = info.queryInterfaceTo(err.asOutParam());
573	if (SUCCEEDED(rc))
574	rc = ::SetErrorInfo (0, err);
575
576	#else // !defined (VBOX_WITH_XPCOM)
577
578	nsCOMPtr <nsIExceptionService> es;
579	es = do_GetService (NS_EXCEPTIONSERVICE_CONTRACTID, &rc);
580	if (NS_SUCCEEDED(rc))
581	{
582	nsCOMPtr <nsIExceptionManager> em;
583	rc = es->GetCurrentExceptionManager (getter_AddRefs (em));
584	if (FAILED(rc)) break;
585
586	ComPtr<IVirtualBoxErrorInfo> curInfo;
587	if (preserve)
588	{
589	/* get the current error info if any */
590	ComPtr<nsIException> ex;
591	rc = em->GetCurrentException (ex.asOutParam());
592	if (FAILED(rc)) break;
593	rc = ex.queryInterfaceTo(curInfo.asOutParam());
594	if (FAILED(rc))
595	{
596	/* create a IVirtualBoxErrorInfo wrapper for the native
597	* nsIException object */
598	ComObjPtr<VirtualBoxErrorInfo> wrapper;
599	rc = wrapper.createObject();
600	if (SUCCEEDED(rc))
601	{
602	rc = wrapper->init (ex);
603	if (SUCCEEDED(rc))
604	curInfo = wrapper;
605	}
606	}
607	}
608	/* On failure, curInfo will stay null */
609	Assert(SUCCEEDED(rc) \|\| curInfo.isNull());
610
611	/* set the current error info and preserve the previous one if any */
612	rc = info->init(ei, curInfo);
613	if (FAILED(rc)) break;
614
615	ComPtr<nsIException> ex;
616	rc = info.queryInterfaceTo(ex.asOutParam());
617	if (SUCCEEDED(rc))
618	rc = em->SetCurrentException (ex);
619	}
620	else if (rc == NS_ERROR_UNEXPECTED)
621	{
622	/*
623	* It is possible that setError() is being called by the object
624	* after the XPCOM shutdown sequence has been initiated
625	* (for example, when XPCOM releases all instances it internally
626	* references, which can cause object's FinalConstruct() and then
627	* uninit()). In this case, do_GetService() above will return
628	* NS_ERROR_UNEXPECTED and it doesn't actually make sense to
629	* set the exception (nobody will be able to read it).
630	*/
631	LogWarningFunc(("Will not set an exception because nsIExceptionService is not available "
632	"(NS_ERROR_UNEXPECTED). XPCOM is being shutdown?\n"));
633	rc = NS_OK;
634	}
635
636	#endif // !defined (VBOX_WITH_XPCOM)
637	}
638	while (0);
639
640	AssertComRC (rc);
641
642	return SUCCEEDED(rc) ? ei.getResultCode() : rc;
643	}
644
645	/**
646	* Like setError(), but sets the "warning" bit in the call to setErrorInternal().
647	* @param aResultCode
648	* @param pcsz
649	* @return
650	*/
651	HRESULT VirtualBoxBase::setWarning(HRESULT aResultCode, const char *pcsz, ...)
652	{
653	va_list args;
654	va_start(args, pcsz);
655	HRESULT rc = setErrorInternal(aResultCode,
656	this->getClassIID(),
657	this->getComponentName(),
658	Utf8Str(pcsz, args),
659	true /* aWarning */,
660	true /* aLogIt */);
661	va_end(args);
662	return rc;
663	}
664
665	/**
666	* Like setError(), but disables the "log" flag in the call to setErrorInternal().
667	* @param aResultCode
668	* @param pcsz
669	* @return
670	*/
671	HRESULT VirtualBoxBase::setErrorNoLog(HRESULT aResultCode, const char *pcsz, ...)
672	{
673	va_list args;
674	va_start(args, pcsz);
675	HRESULT rc = setErrorInternal(aResultCode,
676	this->getClassIID(),
677	this->getComponentName(),
678	Utf8Str(pcsz, args),
679	false /* aWarning */,
680	false /* aLogIt */);
681	va_end(args);
682	return rc;
683	}
684
685	/**
686	* Clear the current error information.
687	*/
688	/static/
689	void VirtualBoxBase::clearError(void)
690	{
691	#if !defined(VBOX_WITH_XPCOM)
692	::SetErrorInfo (0, NULL);
693	#else
694	HRESULT rc = S_OK;
695	nsCOMPtr <nsIExceptionService> es;
696	es = do_GetService(NS_EXCEPTIONSERVICE_CONTRACTID, &rc);
697	if (NS_SUCCEEDED(rc))
698	{
699	nsCOMPtr <nsIExceptionManager> em;
700	rc = es->GetCurrentExceptionManager (getter_AddRefs (em));
701	if (SUCCEEDED(rc))
702	em->SetCurrentException(NULL);
703	}
704	#endif
705	}
706
707
708	////////////////////////////////////////////////////////////////////////////////
709	//
710	// AutoInitSpan methods
711	//
712	////////////////////////////////////////////////////////////////////////////////
713
714	/**
715	* Creates a smart initialization span object that places the object to
716	* InInit state.
717	*
718	* Please see the AutoInitSpan class description for more info.
719	*
720	* @param aObj \|this\| pointer of the managed VirtualBoxBase object whose
721	* init() method is being called.
722	* @param aResult Default initialization result.
723	*/
724	AutoInitSpan::AutoInitSpan(VirtualBoxBase *aObj,
725	Result aResult /* = Failed */)
726	: mObj(aObj),
727	mResult(aResult),
728	mOk(false)
729	{
730	Assert(aObj);
731
732	AutoWriteLock stateLock(mObj->mStateLock COMMA_LOCKVAL_SRC_POS);
733
734	mOk = mObj->mState == VirtualBoxBase::NotReady;
735	AssertReturnVoid (mOk);
736
737	mObj->setState(VirtualBoxBase::InInit);
738	}
739
740	/**
741	* Places the managed VirtualBoxBase object to Ready/Limited state if the
742	* initialization succeeded or partly succeeded, or places it to InitFailed
743	* state and calls the object's uninit() method.
744	*
745	* Please see the AutoInitSpan class description for more info.
746	*/
747	AutoInitSpan::~AutoInitSpan()
748	{
749	/* if the state was other than NotReady, do nothing */
750	if (!mOk)
751	return;
752
753	AutoWriteLock stateLock(mObj->mStateLock COMMA_LOCKVAL_SRC_POS);
754
755	Assert(mObj->mState == VirtualBoxBase::InInit);
756
757	if (mObj->mCallers > 0)
758	{
759	Assert(mObj->mInitUninitWaiters > 0);
760
761	/* We have some pending addCaller() calls on other threads (created
762	* during InInit), signal that InInit is finished and they may go on. */
763	RTSemEventMultiSignal(mObj->mInitUninitSem);
764	}
765
766	if (mResult == Succeeded)
767	{
768	mObj->setState(VirtualBoxBase::Ready);
769	}
770	else
771	if (mResult == Limited)
772	{
773	mObj->setState(VirtualBoxBase::Limited);
774	}
775	else
776	{
777	mObj->setState(VirtualBoxBase::InitFailed);
778	/* release the lock to prevent nesting when uninit() is called */
779	stateLock.acquire();
780	/* call uninit() to let the object uninit itself after failed init() */
781	mObj->uninit();
782	/* Note: the object may no longer exist here (for example, it can call
783	* the destructor in uninit()) */
784	}
785	}
786
787	// AutoReinitSpan methods
788	////////////////////////////////////////////////////////////////////////////////
789
790	/**
791	* Creates a smart re-initialization span object and places the object to
792	* InInit state.
793	*
794	* Please see the AutoInitSpan class description for more info.
795	*
796	* @param aObj \|this\| pointer of the managed VirtualBoxBase object whose
797	* re-initialization method is being called.
798	*/
799	AutoReinitSpan::AutoReinitSpan(VirtualBoxBase *aObj)
800	: mObj(aObj),
801	mSucceeded(false),
802	mOk(false)
803	{
804	Assert(aObj);
805
806	AutoWriteLock stateLock(mObj->mStateLock COMMA_LOCKVAL_SRC_POS);
807
808	mOk = mObj->mState == VirtualBoxBase::Limited;
809	AssertReturnVoid (mOk);
810
811	mObj->setState(VirtualBoxBase::InInit);
812	}
813
814	/**
815	* Places the managed VirtualBoxBase object to Ready state if the
816	* re-initialization succeeded (i.e. #setSucceeded() has been called) or back to
817	* Limited state otherwise.
818	*
819	* Please see the AutoInitSpan class description for more info.
820	*/
821	AutoReinitSpan::~AutoReinitSpan()
822	{
823	/* if the state was other than Limited, do nothing */
824	if (!mOk)
825	return;
826
827	AutoWriteLock stateLock(mObj->mStateLock COMMA_LOCKVAL_SRC_POS);
828
829	Assert(mObj->mState == VirtualBoxBase::InInit);
830
831	if (mObj->mCallers > 0 && mObj->mInitUninitWaiters > 0)
832	{
833	/* We have some pending addCaller() calls on other threads (created
834	* during InInit), signal that InInit is finished and they may go on. */
835	RTSemEventMultiSignal(mObj->mInitUninitSem);
836	}
837
838	if (mSucceeded)
839	{
840	mObj->setState(VirtualBoxBase::Ready);
841	}
842	else
843	{
844	mObj->setState(VirtualBoxBase::Limited);
845	}
846	}
847
848	// AutoUninitSpan methods
849	////////////////////////////////////////////////////////////////////////////////
850
851	/**
852	* Creates a smart uninitialization span object and places this object to
853	* InUninit state.
854	*
855	* Please see the AutoInitSpan class description for more info.
856	*
857	* @note This method blocks the current thread execution until the number of
858	* callers of the managed VirtualBoxBase object drops to zero!
859	*
860	* @param aObj \|this\| pointer of the VirtualBoxBase object whose uninit()
861	* method is being called.
862	*/
863	AutoUninitSpan::AutoUninitSpan(VirtualBoxBase *aObj)
864	: mObj(aObj),
865	mInitFailed(false),
866	mUninitDone(false)
867	{
868	Assert(aObj);
869
870	AutoWriteLock stateLock(mObj->mStateLock COMMA_LOCKVAL_SRC_POS);
871
872	Assert(mObj->mState != VirtualBoxBase::InInit);
873
874	/* Set mUninitDone to \|true\| if this object is already uninitialized
875	* (NotReady) or if another AutoUninitSpan is currently active on some
876	* other thread (InUninit). */
877	mUninitDone = mObj->mState == VirtualBoxBase::NotReady
878	\|\| mObj->mState == VirtualBoxBase::InUninit;
879
880	if (mObj->mState == VirtualBoxBase::InitFailed)
881	{
882	/* we've been called by init() on failure */
883	mInitFailed = true;
884	}
885	else
886	{
887	if (mUninitDone)
888	{
889	/* do nothing if already uninitialized */
890	if (mObj->mState == VirtualBoxBase::NotReady)
891	return;
892
893	/* otherwise, wait until another thread finishes uninitialization.
894	* This is necessary to make sure that when this method returns, the
895	* object is NotReady and therefore can be deleted (for example). */
896
897	/* lazy semaphore creation */
898	if (mObj->mInitUninitSem == NIL_RTSEMEVENTMULTI)
899	{
900	RTSemEventMultiCreate(&mObj->mInitUninitSem);
901	Assert(mObj->mInitUninitWaiters == 0);
902	}
903	++mObj->mInitUninitWaiters;
904
905	LogFlowFunc(("{%p}: Waiting for AutoUninitSpan to finish...\n",
906	mObj));
907
908	stateLock.release();
909	RTSemEventMultiWait(mObj->mInitUninitSem, RT_INDEFINITE_WAIT);
910	stateLock.acquire();
911
912	if (--mObj->mInitUninitWaiters == 0)
913	{
914	/* destroy the semaphore since no more necessary */
915	RTSemEventMultiDestroy(mObj->mInitUninitSem);
916	mObj->mInitUninitSem = NIL_RTSEMEVENTMULTI;
917	}
918
919	return;
920	}
921	}
922
923	/* go to InUninit to prevent from adding new callers */
924	mObj->setState(VirtualBoxBase::InUninit);
925
926	/* wait for already existing callers to drop to zero */
927	if (mObj->mCallers > 0)
928	{
929	/* lazy creation */
930	Assert(mObj->mZeroCallersSem == NIL_RTSEMEVENT);
931	RTSemEventCreate(&mObj->mZeroCallersSem);
932
933	/* wait until remaining callers release the object */
934	LogFlowFunc(("{%p}: Waiting for callers (%d) to drop to zero...\n",
935	mObj, mObj->mCallers));
936
937	stateLock.release();
938	RTSemEventWait(mObj->mZeroCallersSem, RT_INDEFINITE_WAIT);
939	}
940	}
941
942	/**
943	* Places the managed VirtualBoxBase object to the NotReady state.
944	*/
945	AutoUninitSpan::~AutoUninitSpan()
946	{
947	/* do nothing if already uninitialized */
948	if (mUninitDone)
949	return;
950
951	AutoWriteLock stateLock(mObj->mStateLock COMMA_LOCKVAL_SRC_POS);
952
953	Assert(mObj->mState == VirtualBoxBase::InUninit);
954
955	mObj->setState(VirtualBoxBase::NotReady);
956	}
957
958	////////////////////////////////////////////////////////////////////////////////
959	//
960	// MultiResult methods
961	//
962	////////////////////////////////////////////////////////////////////////////////
963
964	RTTLS MultiResult::sCounter = NIL_RTTLS;
965
966	/static/
967	void MultiResult::incCounter()
968	{
969	if (sCounter == NIL_RTTLS)
970	{
971	sCounter = RTTlsAlloc();
972	AssertReturnVoid(sCounter != NIL_RTTLS);
973	}
974
975	uintptr_t counter = (uintptr_t)RTTlsGet(sCounter);
976	++counter;
977	RTTlsSet(sCounter, (void*)counter);
978	}
979
980	/static/
981	void MultiResult::decCounter()
982	{
983	uintptr_t counter = (uintptr_t)RTTlsGet(sCounter);
984	AssertReturnVoid(counter != 0);
985	--counter;
986	RTTlsSet(sCounter, (void*)counter);
987	}
988
989	/static/
990	bool MultiResult::isMultiEnabled()
991	{
992	if (sCounter == NIL_RTTLS)
993	return false;
994
995	return ((uintptr_t)RTTlsGet(MultiResult::sCounter)) > 0;
996	}
997

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source: vbox/trunk/src/VBox/Main/src-all/VirtualBoxBase.cpp@ 40685

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