AutoLock.cpp@ 84575

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1	/* $Id: AutoLock.cpp 82968 2020-02-04 10:35:17Z vboxsync $ */
2	/** @file
3	* Automatic locks, implementation.
4	*/
5
6	/*
7	* Copyright (C) 2006-2020 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*/
17
18
19	/*********************************************************************************************************************************
20	* Defined Constants And Macros *
21	*********************************************************************************************************************************/
22	#define GLUE_USE_CRITSECTRW
23
24
25	/*********************************************************************************************************************************
26	* Header Files *
27	*********************************************************************************************************************************/
28	#include <iprt/cdefs.h>
29	#include <iprt/critsect.h>
30	#include <iprt/thread.h>
31	#include <iprt/semaphore.h>
32
33	#include <iprt/errcore.h>
34	#include <iprt/assert.h>
35
36	#if defined(RT_LOCK_STRICT)
37	# include <iprt/asm.h> // for ASMReturnAddress
38	#endif
39
40	#include <iprt/string.h>
41	#include <iprt/path.h>
42	#include <iprt/stream.h>
43
44	#include "VBox/com/AutoLock.h"
45	#include <VBox/com/string.h>
46
47	#include <vector>
48	#include <list>
49	#include <map>
50
51
52	namespace util
53	{
54
55	////////////////////////////////////////////////////////////////////////////////
56	//
57	// RuntimeLockClass
58	//
59	////////////////////////////////////////////////////////////////////////////////
60
61	#ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
62	typedef std::map<VBoxLockingClass, RTLOCKVALCLASS> LockValidationClassesMap;
63	LockValidationClassesMap g_mapLockValidationClasses;
64	#endif
65
66	/**
67	* Called from initterm.cpp on process initialization (on the main thread)
68	* to give us a chance to initialize lock validation runtime data.
69	*/
70	void InitAutoLockSystem()
71	{
72	#ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
73	struct
74	{
75	VBoxLockingClass cls;
76	const char *pcszDescription;
77	} aClasses[] =
78	{
79	{ LOCKCLASS_VIRTUALBOXOBJECT, "2-VIRTUALBOXOBJECT" },
80	{ LOCKCLASS_HOSTOBJECT, "3-HOSTOBJECT" },
81	{ LOCKCLASS_LISTOFMACHINES, "4-LISTOFMACHINES" },
82	{ LOCKCLASS_MACHINEOBJECT, "5-MACHINEOBJECT" },
83	{ LOCKCLASS_SNAPSHOTOBJECT, "6-SNAPSHOTOBJECT" },
84	{ LOCKCLASS_MEDIUMQUERY, "7-MEDIUMQUERY" },
85	{ LOCKCLASS_LISTOFMEDIA, "8-LISTOFMEDIA" },
86	{ LOCKCLASS_LISTOFOTHEROBJECTS, "9-LISTOFOTHEROBJECTS" },
87	{ LOCKCLASS_OTHEROBJECT, "10-OTHEROBJECT" },
88	{ LOCKCLASS_PROGRESSLIST, "11-PROGRESSLIST" },
89	{ LOCKCLASS_OBJECTSTATE, "12-OBJECTSTATE" }
90	};
91
92	RTLOCKVALCLASS hClass;
93	int vrc;
94	for (unsigned i = 0; i < RT_ELEMENTS(aClasses); ++i)
95	{
96	vrc = RTLockValidatorClassCreate(&hClass,
97	true, /fAutodidact/
98	RT_SRC_POS,
99	aClasses[i].pcszDescription);
100	AssertRC(vrc);
101
102	// teach the new class that the classes created previously can be held
103	// while the new class is being acquired
104	for (LockValidationClassesMap::iterator it = g_mapLockValidationClasses.begin();
105	it != g_mapLockValidationClasses.end();
106	++it)
107	{
108	RTLOCKVALCLASS &canBeHeld = it->second;
109	vrc = RTLockValidatorClassAddPriorClass(hClass,
110	canBeHeld);
111	AssertRC(vrc);
112	}
113
114	// and store the new class
115	g_mapLockValidationClasses[aClasses[i].cls] = hClass;
116	}
117
118	/* WriteLockHandle critsect1(LOCKCLASS_VIRTUALBOXOBJECT);
119	WriteLockHandle critsect2(LOCKCLASS_VIRTUALBOXLIST);
120
121	AutoWriteLock lock1(critsect1 COMMA_LOCKVAL_SRC_POS);
122	AutoWriteLock lock2(critsect2 COMMA_LOCKVAL_SRC_POS);*/
123	#endif
124	}
125
126	bool AutoLockHoldsLocksInClass(VBoxLockingClass lockClass)
127	{
128	#ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
129	return RTLockValidatorHoldsLocksInClass(NIL_RTTHREAD, g_mapLockValidationClasses[lockClass]);
130	#else
131	RT_NOREF(lockClass);
132	return false;
133	#endif
134	}
135
136	////////////////////////////////////////////////////////////////////////////////
137	//
138	// RWLockHandle
139	//
140	////////////////////////////////////////////////////////////////////////////////
141
142	struct RWLockHandle::Data
143	{
144	Data()
145	{ }
146
147	#ifdef GLUE_USE_CRITSECTRW
148	mutable RTCRITSECTRW CritSect;
149	#else
150	RTSEMRW sem;
151	#endif
152	VBoxLockingClass lockClass;
153
154	#ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
155	com::Utf8Str strDescription;
156	#endif
157	};
158
159	RWLockHandle::RWLockHandle(VBoxLockingClass lockClass)
160	{
161	m = new Data();
162
163	m->lockClass = lockClass;
164	#ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
165	m->strDescription = com::Utf8StrFmt("r/w %RCv", this);
166	#endif
167
168	#ifdef GLUE_USE_CRITSECTRW
169	# ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
170	int vrc = RTCritSectRwInitEx(&m->CritSect, 0 /fFlags/, g_mapLockValidationClasses[lockClass], RTLOCKVAL_SUB_CLASS_ANY, NULL);
171	# else
172	int vrc = RTCritSectRwInitEx(&m->CritSect, 0 /fFlags/, NIL_RTLOCKVALCLASS, RTLOCKVAL_SUB_CLASS_ANY, NULL);
173	# endif
174	#else
175	# ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
176	int vrc = RTSemRWCreateEx(&m->sem, 0 /fFlags/, g_mapLockValidationClasses[lockClass], RTLOCKVAL_SUB_CLASS_ANY, NULL);
177	# else
178	int vrc = RTSemRWCreateEx(&m->sem, 0 /fFlags/, NIL_RTLOCKVALCLASS, RTLOCKVAL_SUB_CLASS_ANY, NULL);
179	# endif
180	#endif
181	AssertRC(vrc);
182	}
183
184	/virtual/ RWLockHandle::~RWLockHandle()
185	{
186	#ifdef GLUE_USE_CRITSECTRW
187	RTCritSectRwDelete(&m->CritSect);
188	#else
189	RTSemRWDestroy(m->sem);
190	#endif
191	delete m;
192	}
193
194	/virtual/ bool RWLockHandle::isWriteLockOnCurrentThread() const
195	{
196	#ifdef GLUE_USE_CRITSECTRW
197	return RTCritSectRwIsWriteOwner(&m->CritSect);
198	#else
199	return RTSemRWIsWriteOwner(m->sem);
200	#endif
201	}
202
203	/virtual/ void RWLockHandle::lockWrite(LOCKVAL_SRC_POS_DECL)
204	{
205	#ifdef GLUE_USE_CRITSECTRW
206	# ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
207	int vrc = RTCritSectRwEnterExclDebug(&m->CritSect, (uintptr_t)ASMReturnAddress(), RT_SRC_POS_ARGS);
208	# else
209	int vrc = RTCritSectRwEnterExcl(&m->CritSect);
210	# endif
211	#else
212	# ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
213	int vrc = RTSemRWRequestWriteDebug(m->sem, RT_INDEFINITE_WAIT, (uintptr_t)ASMReturnAddress(), RT_SRC_POS_ARGS);
214	# else
215	int vrc = RTSemRWRequestWrite(m->sem, RT_INDEFINITE_WAIT);
216	# endif
217	#endif
218	AssertRC(vrc);
219	}
220
221	/virtual/ void RWLockHandle::unlockWrite()
222	{
223	#ifdef GLUE_USE_CRITSECTRW
224	int vrc = RTCritSectRwLeaveExcl(&m->CritSect);
225	#else
226	int vrc = RTSemRWReleaseWrite(m->sem);
227	#endif
228	AssertRC(vrc);
229
230	}
231
232	/virtual/ bool RWLockHandle::isReadLockedOnCurrentThread(bool fWannaHear) const
233	{
234	#ifdef GLUE_USE_CRITSECTRW
235	return RTCritSectRwIsReadOwner(&m->CritSect, fWannaHear);
236	#else
237	return RTSemRWIsReadOwner(m->sem, fWannaHear);
238	#endif
239	}
240
241	/virtual/ void RWLockHandle::lockRead(LOCKVAL_SRC_POS_DECL)
242	{
243	#ifdef GLUE_USE_CRITSECTRW
244	# ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
245	int vrc = RTCritSectRwEnterSharedDebug(&m->CritSect, (uintptr_t)ASMReturnAddress(), RT_SRC_POS_ARGS);
246	# else
247	int vrc = RTCritSectRwEnterShared(&m->CritSect);
248	# endif
249	#else
250	# ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
251	int vrc = RTSemRWRequestReadDebug(m->sem, RT_INDEFINITE_WAIT, (uintptr_t)ASMReturnAddress(), RT_SRC_POS_ARGS);
252	# else
253	int vrc = RTSemRWRequestRead(m->sem, RT_INDEFINITE_WAIT);
254	# endif
255	#endif
256	AssertRC(vrc);
257	}
258
259	/virtual/ void RWLockHandle::unlockRead()
260	{
261	#ifdef GLUE_USE_CRITSECTRW
262	int vrc = RTCritSectRwLeaveShared(&m->CritSect);
263	#else
264	int vrc = RTSemRWReleaseRead(m->sem);
265	#endif
266	AssertRC(vrc);
267	}
268
269	/virtual/ uint32_t RWLockHandle::writeLockLevel() const
270	{
271	/* Note! This does not include read recursions done by the writer! */
272	#ifdef GLUE_USE_CRITSECTRW
273	return RTCritSectRwGetWriteRecursion(&m->CritSect);
274	#else
275	return RTSemRWGetWriteRecursion(m->sem);
276	#endif
277	}
278
279	#ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
280	/virtual/ const char* RWLockHandle::describe() const
281	{
282	return m->strDescription.c_str();
283	}
284	#endif
285
286	////////////////////////////////////////////////////////////////////////////////
287	//
288	// WriteLockHandle
289	//
290	////////////////////////////////////////////////////////////////////////////////
291
292	struct WriteLockHandle::Data
293	{
294	Data()
295	{ }
296
297	mutable RTCRITSECT sem;
298	VBoxLockingClass lockClass;
299
300	#ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
301	com::Utf8Str strDescription;
302	#endif
303	};
304
305	WriteLockHandle::WriteLockHandle(VBoxLockingClass lockClass)
306	{
307	m = new Data;
308
309	m->lockClass = lockClass;
310
311	#ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
312	m->strDescription = com::Utf8StrFmt("crit %RCv", this);
313	int vrc = RTCritSectInitEx(&m->sem, 0/fFlags/, g_mapLockValidationClasses[lockClass], RTLOCKVAL_SUB_CLASS_ANY, NULL);
314	#else
315	int vrc = RTCritSectInitEx(&m->sem, 0/fFlags/, NIL_RTLOCKVALCLASS, RTLOCKVAL_SUB_CLASS_ANY, NULL);
316	#endif
317	AssertRC(vrc);
318	}
319
320	WriteLockHandle::~WriteLockHandle()
321	{
322	RTCritSectDelete(&m->sem);
323	delete m;
324	}
325
326	/virtual/ bool WriteLockHandle::isWriteLockOnCurrentThread() const
327	{
328	return RTCritSectIsOwner(&m->sem);
329	}
330
331	/virtual/ void WriteLockHandle::lockWrite(LOCKVAL_SRC_POS_DECL)
332	{
333	#ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
334	RTCritSectEnterDebug(&m->sem, (uintptr_t)ASMReturnAddress(), RT_SRC_POS_ARGS);
335	#else
336	RTCritSectEnter(&m->sem);
337	#endif
338	}
339
340	/virtual/ bool WriteLockHandle::isReadLockedOnCurrentThread(bool fWannaHear) const
341	{
342	RT_NOREF(fWannaHear);
343	return RTCritSectIsOwner(&m->sem);
344	}
345
346	/virtual/ void WriteLockHandle::unlockWrite()
347	{
348	RTCritSectLeave(&m->sem);
349	}
350
351	/virtual/ void WriteLockHandle::lockRead(LOCKVAL_SRC_POS_DECL)
352	{
353	lockWrite(LOCKVAL_SRC_POS_ARGS);
354	}
355
356	/virtual/ void WriteLockHandle::unlockRead()
357	{
358	unlockWrite();
359	}
360
361	/virtual/ uint32_t WriteLockHandle::writeLockLevel() const
362	{
363	return RTCritSectGetRecursion(&m->sem);
364	}
365
366	#ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
367	/virtual/ const char* WriteLockHandle::describe() const
368	{
369	return m->strDescription.c_str();
370	}
371	#endif
372
373	////////////////////////////////////////////////////////////////////////////////
374	//
375	// AutoLockBase
376	//
377	////////////////////////////////////////////////////////////////////////////////
378
379	typedef std::vector<LockHandle*> HandlesVector;
380
381	struct AutoLockBase::Data
382	{
383	Data(size_t cHandles
384	#ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
385	, const char *pcszFile_,
386	unsigned uLine_,
387	const char *pcszFunction_
388	#endif
389	)
390	: fIsLocked(false),
391	aHandles(cHandles) // size of array
392	#ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
393	, pcszFile(pcszFile_),
394	uLine(uLine_),
395	pcszFunction(pcszFunction_)
396	#endif
397	{
398	for (uint32_t i = 0; i < cHandles; ++i)
399	aHandles[i] = NULL;
400	}
401
402	bool fIsLocked; // if true, then all items in aHandles are locked by this AutoLock and
403	// need to be unlocked in the destructor
404	HandlesVector aHandles; // array (vector) of LockHandle instances; in the case of AutoWriteLock
405	// and AutoReadLock, there will only be one item on the list; with the
406	// AutoMulti* derivatives, there will be multiple
407
408	#ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
409	// information about where the lock occurred (passed down from the AutoLock classes)
410	const char *pcszFile;
411	unsigned uLine;
412	const char *pcszFunction;
413	#endif
414	};
415
416	AutoLockBase::AutoLockBase(uint32_t cHandles
417	COMMA_LOCKVAL_SRC_POS_DECL)
418	{
419	m = new Data(cHandles COMMA_LOCKVAL_SRC_POS_ARGS);
420	}
421
422	AutoLockBase::AutoLockBase(uint32_t cHandles,
423	LockHandle *pHandle
424	COMMA_LOCKVAL_SRC_POS_DECL)
425	{
426	Assert(cHandles == 1); NOREF(cHandles);
427	m = new Data(1 COMMA_LOCKVAL_SRC_POS_ARGS);
428	m->aHandles[0] = pHandle;
429	}
430
431	AutoLockBase::~AutoLockBase()
432	{
433	delete m;
434	}
435
436	/**
437	* Requests ownership of all contained lock handles by calling
438	* the pure virtual callLockImpl() function on each of them,
439	* which must be implemented by the descendant class; in the
440	* implementation, AutoWriteLock will request a write lock
441	* whereas AutoReadLock will request a read lock.
442	*
443	* Does not modify the lock counts in the member variables.
444	*/
445	void AutoLockBase::callLockOnAllHandles()
446	{
447	for (HandlesVector::iterator it = m->aHandles.begin();
448	it != m->aHandles.end();
449	++it)
450	{
451	LockHandle pHandle = it;
452	if (pHandle)
453	// call virtual function implemented in AutoWriteLock or AutoReadLock
454	this->callLockImpl(*pHandle);
455	}
456	}
457
458	/**
459	* Releases ownership of all contained lock handles by calling
460	* the pure virtual callUnlockImpl() function on each of them,
461	* which must be implemented by the descendant class; in the
462	* implementation, AutoWriteLock will release a write lock
463	* whereas AutoReadLock will release a read lock.
464	*
465	* Does not modify the lock counts in the member variables.
466	*/
467	void AutoLockBase::callUnlockOnAllHandles()
468	{
469	// unlock in reverse order!
470	for (HandlesVector::reverse_iterator it = m->aHandles.rbegin();
471	it != m->aHandles.rend();
472	++it)
473	{
474	LockHandle pHandle = it;
475	if (pHandle)
476	// call virtual function implemented in AutoWriteLock or AutoReadLock
477	this->callUnlockImpl(*pHandle);
478	}
479	}
480
481	/**
482	* Destructor implementation that can also be called explicitly, if required.
483	* Restores the exact state before the AutoLock was created; that is, unlocks
484	* all contained semaphores.
485	*/
486	void AutoLockBase::cleanup()
487	{
488	if (m->fIsLocked)
489	callUnlockOnAllHandles();
490	}
491
492	/**
493	* Requests ownership of all contained semaphores. Public method that can
494	* only be called once and that also gets called by the AutoLock constructors.
495	*/
496	void AutoLockBase::acquire()
497	{
498	AssertMsgReturnVoid(!m->fIsLocked, ("m->fIsLocked is true, attempting to lock twice!"));
499	callLockOnAllHandles();
500	m->fIsLocked = true;
501	}
502
503	/**
504	* Releases ownership of all contained semaphores. Public method.
505	*/
506	void AutoLockBase::release()
507	{
508	AssertMsgReturnVoid(m->fIsLocked, ("m->fIsLocked is false, cannot release!"));
509	callUnlockOnAllHandles();
510	m->fIsLocked = false;
511	}
512
513	////////////////////////////////////////////////////////////////////////////////
514	//
515	// AutoReadLock
516	//
517	////////////////////////////////////////////////////////////////////////////////
518
519	/**
520	* Release all read locks acquired by this instance through the #lock()
521	* call and destroys the instance.
522	*
523	* Note that if there there are nested #lock() calls without the
524	* corresponding number of #unlock() calls when the destructor is called, it
525	* will assert. This is because having an unbalanced number of nested locks
526	* is a program logic error which must be fixed.
527	*/
528	/virtual/ AutoReadLock::~AutoReadLock()
529	{
530	LockHandle *pHandle = m->aHandles[0];
531
532	if (pHandle)
533	{
534	if (m->fIsLocked)
535	callUnlockImpl(*pHandle);
536	}
537	}
538
539	/**
540	* Implementation of the pure virtual declared in AutoLockBase.
541	* This gets called by AutoLockBase.acquire() to actually request
542	* the semaphore; in the AutoReadLock implementation, we request
543	* the semaphore in read mode.
544	*/
545	/virtual/ void AutoReadLock::callLockImpl(LockHandle &l)
546	{
547	#ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
548	l.lockRead(m->pcszFile, m->uLine, m->pcszFunction);
549	#else
550	l.lockRead();
551	#endif
552	}
553
554	/**
555	* Implementation of the pure virtual declared in AutoLockBase.
556	* This gets called by AutoLockBase.release() to actually release
557	* the semaphore; in the AutoReadLock implementation, we release
558	* the semaphore in read mode.
559	*/
560	/virtual/ void AutoReadLock::callUnlockImpl(LockHandle &l)
561	{
562	l.unlockRead();
563	}
564
565	////////////////////////////////////////////////////////////////////////////////
566	//
567	// AutoWriteLockBase
568	//
569	////////////////////////////////////////////////////////////////////////////////
570
571	/**
572	* Implementation of the pure virtual declared in AutoLockBase.
573	* This gets called by AutoLockBase.acquire() to actually request
574	* the semaphore; in the AutoWriteLock implementation, we request
575	* the semaphore in write mode.
576	*/
577	/virtual/ void AutoWriteLockBase::callLockImpl(LockHandle &l)
578	{
579	#ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
580	l.lockWrite(m->pcszFile, m->uLine, m->pcszFunction);
581	#else
582	l.lockWrite();
583	#endif
584	}
585
586	/**
587	* Implementation of the pure virtual declared in AutoLockBase.
588	* This gets called by AutoLockBase.release() to actually release
589	* the semaphore; in the AutoWriteLock implementation, we release
590	* the semaphore in write mode.
591	*/
592	/virtual/ void AutoWriteLockBase::callUnlockImpl(LockHandle &l)
593	{
594	l.unlockWrite();
595	}
596
597	////////////////////////////////////////////////////////////////////////////////
598	//
599	// AutoWriteLock
600	//
601	////////////////////////////////////////////////////////////////////////////////
602
603	AutoWriteLock::AutoWriteLock(uint32_t cHandles,
604	LockHandle** pHandles
605	COMMA_LOCKVAL_SRC_POS_DECL)
606	: AutoWriteLockBase(cHandles
607	COMMA_LOCKVAL_SRC_POS_ARGS)
608	{
609	Assert(cHandles);
610	Assert(pHandles);
611
612	for (uint32_t i = 0; i < cHandles; ++i)
613	m->aHandles[i] = pHandles[i];
614
615	acquire();
616	}
617
618
619
620	/**
621	* Attaches another handle to this auto lock instance.
622	*
623	* The previous object's lock is completely released before the new one is
624	* acquired. The lock level of the new handle will be the same. This
625	* also means that if the lock was not acquired at all before #attach(), it
626	* will not be acquired on the new handle too.
627	*
628	* @param aHandle New handle to attach.
629	*/
630	void AutoWriteLock::attach(LockHandle *aHandle)
631	{
632	LockHandle *pHandle = m->aHandles[0];
633
634	/* detect simple self-reattachment */
635	if (pHandle != aHandle)
636	{
637	bool fWasLocked = m->fIsLocked;
638
639	cleanup();
640
641	m->aHandles[0] = aHandle;
642	m->fIsLocked = fWasLocked;
643
644	if (aHandle)
645	if (fWasLocked)
646	callLockImpl(*aHandle);
647	}
648	}
649
650	/**
651	* Returns @c true if the current thread holds a write lock on the managed
652	* read/write semaphore. Returns @c false if the managed semaphore is @c
653	* NULL.
654	*
655	* @note Intended for debugging only.
656	*/
657	bool AutoWriteLock::isWriteLockOnCurrentThread() const
658	{
659	return m->aHandles[0] ? m->aHandles[0]->isWriteLockOnCurrentThread() : false;
660	}
661
662	/**
663	* Returns the current write lock level of the managed semaphore. The lock
664	* level determines the number of nested #lock() calls on the given
665	* semaphore handle. Returns @c 0 if the managed semaphore is @c
666	* NULL.
667	*
668	* Note that this call is valid only when the current thread owns a write
669	* lock on the given semaphore handle and will assert otherwise.
670	*
671	* @note Intended for debugging only.
672	*/
673	uint32_t AutoWriteLock::writeLockLevel() const
674	{
675	return m->aHandles[0] ? m->aHandles[0]->writeLockLevel() : 0;
676	}
677
678	/**
679	* Returns @c true if the current thread holds a write lock on the managed
680	* read/write semaphore. Returns @c false if the managed semaphore is @c
681	* NULL.
682	*
683	* @note Intended for debugging only (esp. considering fWannaHear).
684	*/
685	bool AutoWriteLock::isReadLockedOnCurrentThread(bool fWannaHear) const
686	{
687	return m->aHandles[0] ? m->aHandles[0]->isReadLockedOnCurrentThread(fWannaHear) : false;
688	}
689
690	////////////////////////////////////////////////////////////////////////////////
691	//
692	// AutoMultiWriteLock*
693	//
694	////////////////////////////////////////////////////////////////////////////////
695
696	AutoMultiWriteLock2::AutoMultiWriteLock2(Lockable *pl1,
697	Lockable *pl2
698	COMMA_LOCKVAL_SRC_POS_DECL)
699	: AutoWriteLockBase(2
700	COMMA_LOCKVAL_SRC_POS_ARGS)
701	{
702	if (pl1)
703	m->aHandles[0] = pl1->lockHandle();
704	if (pl2)
705	m->aHandles[1] = pl2->lockHandle();
706	acquire();
707	}
708
709	AutoMultiWriteLock2::AutoMultiWriteLock2(LockHandle *pl1,
710	LockHandle *pl2
711	COMMA_LOCKVAL_SRC_POS_DECL)
712	: AutoWriteLockBase(2
713	COMMA_LOCKVAL_SRC_POS_ARGS)
714	{
715	m->aHandles[0] = pl1;
716	m->aHandles[1] = pl2;
717	acquire();
718	}
719
720	AutoMultiWriteLock3::AutoMultiWriteLock3(Lockable *pl1,
721	Lockable *pl2,
722	Lockable *pl3
723	COMMA_LOCKVAL_SRC_POS_DECL)
724	: AutoWriteLockBase(3
725	COMMA_LOCKVAL_SRC_POS_ARGS)
726	{
727	if (pl1)
728	m->aHandles[0] = pl1->lockHandle();
729	if (pl2)
730	m->aHandles[1] = pl2->lockHandle();
731	if (pl3)
732	m->aHandles[2] = pl3->lockHandle();
733	acquire();
734	}
735
736	AutoMultiWriteLock3::AutoMultiWriteLock3(LockHandle *pl1,
737	LockHandle *pl2,
738	LockHandle *pl3
739	COMMA_LOCKVAL_SRC_POS_DECL)
740	: AutoWriteLockBase(3
741	COMMA_LOCKVAL_SRC_POS_ARGS)
742	{
743	m->aHandles[0] = pl1;
744	m->aHandles[1] = pl2;
745	m->aHandles[2] = pl3;
746	acquire();
747	}
748
749	AutoMultiWriteLock4::AutoMultiWriteLock4(Lockable *pl1,
750	Lockable *pl2,
751	Lockable *pl3,
752	Lockable *pl4
753	COMMA_LOCKVAL_SRC_POS_DECL)
754	: AutoWriteLockBase(4
755	COMMA_LOCKVAL_SRC_POS_ARGS)
756	{
757	if (pl1)
758	m->aHandles[0] = pl1->lockHandle();
759	if (pl2)
760	m->aHandles[1] = pl2->lockHandle();
761	if (pl3)
762	m->aHandles[2] = pl3->lockHandle();
763	if (pl4)
764	m->aHandles[3] = pl4->lockHandle();
765	acquire();
766	}
767
768	AutoMultiWriteLock4::AutoMultiWriteLock4(LockHandle *pl1,
769	LockHandle *pl2,
770	LockHandle *pl3,
771	LockHandle *pl4
772	COMMA_LOCKVAL_SRC_POS_DECL)
773	: AutoWriteLockBase(4
774	COMMA_LOCKVAL_SRC_POS_ARGS)
775	{
776	m->aHandles[0] = pl1;
777	m->aHandles[1] = pl2;
778	m->aHandles[2] = pl3;
779	m->aHandles[3] = pl4;
780	acquire();
781	}
782
783	} /* namespace util */
784	/* vi: set tabstop=4 shiftwidth=4 expandtab: */

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source: vbox/trunk/src/VBox/Main/glue/AutoLock.cpp@ 84575

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