AutoLock.cpp@ 105006

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1	/* $Id: AutoLock.cpp 98103 2023-01-17 14:15:46Z vboxsync $ */
2	/** @file
3	* Automatic locks, implementation.
4	*/
5
6	/*
7	* Copyright (C) 2006-2023 Oracle and/or its affiliates.
8	*
9	* This file is part of VirtualBox base platform packages, as
10	* available from https://www.virtualbox.org.
11	*
12	* This program is free software; you can redistribute it and/or
13	* modify it under the terms of the GNU General Public License
14	* as published by the Free Software Foundation, in version 3 of the
15	* License.
16	*
17	* This program is distributed in the hope that it will be useful, but
18	* WITHOUT ANY WARRANTY; without even the implied warranty of
19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20	* General Public License for more details.
21	*
22	* You should have received a copy of the GNU General Public License
23	* along with this program; if not, see <https://www.gnu.org/licenses>.
24	*
25	* SPDX-License-Identifier: GPL-3.0-only
26	*/
27
28
29	/*********************************************************************************************************************************
30	* Defined Constants And Macros *
31	*********************************************************************************************************************************/
32	#define GLUE_USE_CRITSECTRW
33
34
35	/*********************************************************************************************************************************
36	* Header Files *
37	*********************************************************************************************************************************/
38	#include <iprt/cdefs.h>
39	#include <iprt/critsect.h>
40	#include <iprt/thread.h>
41	#include <iprt/semaphore.h>
42
43	#include <iprt/errcore.h>
44	#include <iprt/assert.h>
45
46	#if defined(RT_LOCK_STRICT)
47	# include <iprt/asm.h> // for ASMReturnAddress
48	#endif
49
50	#include <iprt/string.h>
51	#include <iprt/path.h>
52	#include <iprt/stream.h>
53
54	#include "VBox/com/AutoLock.h"
55	#include <VBox/com/string.h>
56
57	#include <vector>
58	#include <list>
59	#include <map>
60
61
62	namespace util
63	{
64
65	////////////////////////////////////////////////////////////////////////////////
66	//
67	// RuntimeLockClass
68	//
69	////////////////////////////////////////////////////////////////////////////////
70
71	#ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
72	typedef std::map<VBoxLockingClass, RTLOCKVALCLASS> LockValidationClassesMap;
73	LockValidationClassesMap g_mapLockValidationClasses;
74	#endif
75
76	/**
77	* Called from initterm.cpp on process initialization (on the main thread)
78	* to give us a chance to initialize lock validation runtime data.
79	*/
80	void InitAutoLockSystem()
81	{
82	#ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
83	struct
84	{
85	VBoxLockingClass cls;
86	const char *pcszDescription;
87	} aClasses[] =
88	{
89	{ LOCKCLASS_VIRTUALBOXOBJECT, "2-VIRTUALBOXOBJECT" },
90	{ LOCKCLASS_HOSTOBJECT, "3-HOSTOBJECT" },
91	{ LOCKCLASS_LISTOFMACHINES, "4-LISTOFMACHINES" },
92	{ LOCKCLASS_MACHINEOBJECT, "5-MACHINEOBJECT" },
93	{ LOCKCLASS_SNAPSHOTOBJECT, "6-SNAPSHOTOBJECT" },
94	{ LOCKCLASS_MEDIUMQUERY, "7-MEDIUMQUERY" },
95	{ LOCKCLASS_LISTOFMEDIA, "8-LISTOFMEDIA" },
96	{ LOCKCLASS_LISTOFOTHEROBJECTS, "9-LISTOFOTHEROBJECTS" },
97	{ LOCKCLASS_OTHEROBJECT, "10-OTHEROBJECT" },
98	{ LOCKCLASS_PROGRESSLIST, "11-PROGRESSLIST" },
99	{ LOCKCLASS_OBJECTSTATE, "12-OBJECTSTATE" },
100	{ LOCKCLASS_TRANSLATOR, "13-TRANSLATOR" }
101	};
102
103	RTLOCKVALCLASS hClass;
104	int vrc;
105	for (unsigned i = 0; i < RT_ELEMENTS(aClasses); ++i)
106	{
107	vrc = RTLockValidatorClassCreate(&hClass,
108	true, /fAutodidact/
109	RT_SRC_POS,
110	aClasses[i].pcszDescription);
111	AssertRC(vrc);
112
113	// teach the new class that the classes created previously can be held
114	// while the new class is being acquired
115	for (LockValidationClassesMap::iterator it = g_mapLockValidationClasses.begin();
116	it != g_mapLockValidationClasses.end();
117	++it)
118	{
119	RTLOCKVALCLASS &canBeHeld = it->second;
120	vrc = RTLockValidatorClassAddPriorClass(hClass,
121	canBeHeld);
122	AssertRC(vrc);
123	}
124
125	// and store the new class
126	g_mapLockValidationClasses[aClasses[i].cls] = hClass;
127	}
128
129	/* WriteLockHandle critsect1(LOCKCLASS_VIRTUALBOXOBJECT);
130	WriteLockHandle critsect2(LOCKCLASS_VIRTUALBOXLIST);
131
132	AutoWriteLock lock1(critsect1 COMMA_LOCKVAL_SRC_POS);
133	AutoWriteLock lock2(critsect2 COMMA_LOCKVAL_SRC_POS);*/
134	#endif
135	}
136
137	bool AutoLockHoldsLocksInClass(VBoxLockingClass lockClass)
138	{
139	#ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
140	return RTLockValidatorHoldsLocksInClass(NIL_RTTHREAD, g_mapLockValidationClasses[lockClass]);
141	#else
142	RT_NOREF(lockClass);
143	return false;
144	#endif
145	}
146
147	////////////////////////////////////////////////////////////////////////////////
148	//
149	// RWLockHandle
150	//
151	////////////////////////////////////////////////////////////////////////////////
152
153	struct RWLockHandle::Data
154	{
155	Data()
156	{ }
157
158	#ifdef GLUE_USE_CRITSECTRW
159	mutable RTCRITSECTRW CritSect;
160	#else
161	RTSEMRW sem;
162	#endif
163	VBoxLockingClass lockClass;
164
165	#ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
166	com::Utf8Str strDescription;
167	#endif
168	};
169
170	RWLockHandle::RWLockHandle(VBoxLockingClass lockClass)
171	{
172	m = new Data();
173
174	m->lockClass = lockClass;
175	#ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
176	m->strDescription.printf("r/w %RCv", this);
177	#endif
178
179	#ifdef GLUE_USE_CRITSECTRW
180	# ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
181	int vrc = RTCritSectRwInitEx(&m->CritSect, 0 /fFlags/, g_mapLockValidationClasses[lockClass], RTLOCKVAL_SUB_CLASS_ANY, NULL);
182	# else
183	int vrc = RTCritSectRwInitEx(&m->CritSect, 0 /fFlags/, NIL_RTLOCKVALCLASS, RTLOCKVAL_SUB_CLASS_ANY, NULL);
184	# endif
185	#else
186	# ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
187	int vrc = RTSemRWCreateEx(&m->sem, 0 /fFlags/, g_mapLockValidationClasses[lockClass], RTLOCKVAL_SUB_CLASS_ANY, NULL);
188	# else
189	int vrc = RTSemRWCreateEx(&m->sem, 0 /fFlags/, NIL_RTLOCKVALCLASS, RTLOCKVAL_SUB_CLASS_ANY, NULL);
190	# endif
191	#endif
192	AssertRC(vrc);
193	}
194
195	/virtual/ RWLockHandle::~RWLockHandle()
196	{
197	#ifdef GLUE_USE_CRITSECTRW
198	RTCritSectRwDelete(&m->CritSect);
199	#else
200	RTSemRWDestroy(m->sem);
201	#endif
202	delete m;
203	}
204
205	/virtual/ bool RWLockHandle::isWriteLockOnCurrentThread() const
206	{
207	#ifdef GLUE_USE_CRITSECTRW
208	return RTCritSectRwIsWriteOwner(&m->CritSect);
209	#else
210	return RTSemRWIsWriteOwner(m->sem);
211	#endif
212	}
213
214	/virtual/ void RWLockHandle::lockWrite(LOCKVAL_SRC_POS_DECL)
215	{
216	#ifdef GLUE_USE_CRITSECTRW
217	# ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
218	int vrc = RTCritSectRwEnterExclDebug(&m->CritSect, (uintptr_t)ASMReturnAddress(), RT_SRC_POS_ARGS);
219	# else
220	int vrc = RTCritSectRwEnterExcl(&m->CritSect);
221	# endif
222	#else
223	# ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
224	int vrc = RTSemRWRequestWriteDebug(m->sem, RT_INDEFINITE_WAIT, (uintptr_t)ASMReturnAddress(), RT_SRC_POS_ARGS);
225	# else
226	int vrc = RTSemRWRequestWrite(m->sem, RT_INDEFINITE_WAIT);
227	# endif
228	#endif
229	AssertRC(vrc);
230	}
231
232	/virtual/ void RWLockHandle::unlockWrite()
233	{
234	#ifdef GLUE_USE_CRITSECTRW
235	int vrc = RTCritSectRwLeaveExcl(&m->CritSect);
236	#else
237	int vrc = RTSemRWReleaseWrite(m->sem);
238	#endif
239	AssertRC(vrc);
240
241	}
242
243	/virtual/ bool RWLockHandle::isReadLockedOnCurrentThread(bool fWannaHear) const
244	{
245	#ifdef GLUE_USE_CRITSECTRW
246	return RTCritSectRwIsReadOwner(&m->CritSect, fWannaHear);
247	#else
248	return RTSemRWIsReadOwner(m->sem, fWannaHear);
249	#endif
250	}
251
252	/virtual/ void RWLockHandle::lockRead(LOCKVAL_SRC_POS_DECL)
253	{
254	#ifdef GLUE_USE_CRITSECTRW
255	# ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
256	int vrc = RTCritSectRwEnterSharedDebug(&m->CritSect, (uintptr_t)ASMReturnAddress(), RT_SRC_POS_ARGS);
257	# else
258	int vrc = RTCritSectRwEnterShared(&m->CritSect);
259	# endif
260	#else
261	# ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
262	int vrc = RTSemRWRequestReadDebug(m->sem, RT_INDEFINITE_WAIT, (uintptr_t)ASMReturnAddress(), RT_SRC_POS_ARGS);
263	# else
264	int vrc = RTSemRWRequestRead(m->sem, RT_INDEFINITE_WAIT);
265	# endif
266	#endif
267	AssertRC(vrc);
268	}
269
270	/virtual/ void RWLockHandle::unlockRead()
271	{
272	#ifdef GLUE_USE_CRITSECTRW
273	int vrc = RTCritSectRwLeaveShared(&m->CritSect);
274	#else
275	int vrc = RTSemRWReleaseRead(m->sem);
276	#endif
277	AssertRC(vrc);
278	}
279
280	/virtual/ uint32_t RWLockHandle::writeLockLevel() const
281	{
282	/* Note! This does not include read recursions done by the writer! */
283	#ifdef GLUE_USE_CRITSECTRW
284	return RTCritSectRwGetWriteRecursion(&m->CritSect);
285	#else
286	return RTSemRWGetWriteRecursion(m->sem);
287	#endif
288	}
289
290	#ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
291	/virtual/ const char* RWLockHandle::describe() const
292	{
293	return m->strDescription.c_str();
294	}
295	#endif
296
297	////////////////////////////////////////////////////////////////////////////////
298	//
299	// WriteLockHandle
300	//
301	////////////////////////////////////////////////////////////////////////////////
302
303	struct WriteLockHandle::Data
304	{
305	Data()
306	{ }
307
308	mutable RTCRITSECT sem;
309	VBoxLockingClass lockClass;
310
311	#ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
312	com::Utf8Str strDescription;
313	#endif
314	};
315
316	WriteLockHandle::WriteLockHandle(VBoxLockingClass lockClass)
317	{
318	m = new Data;
319
320	m->lockClass = lockClass;
321
322	#ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
323	m->strDescription = com::Utf8StrFmt("crit %RCv", this);
324	int vrc = RTCritSectInitEx(&m->sem, 0/fFlags/, g_mapLockValidationClasses[lockClass], RTLOCKVAL_SUB_CLASS_ANY, NULL);
325	#else
326	int vrc = RTCritSectInitEx(&m->sem, 0/fFlags/, NIL_RTLOCKVALCLASS, RTLOCKVAL_SUB_CLASS_ANY, NULL);
327	#endif
328	AssertRC(vrc);
329	}
330
331	WriteLockHandle::~WriteLockHandle()
332	{
333	RTCritSectDelete(&m->sem);
334	delete m;
335	}
336
337	/virtual/ bool WriteLockHandle::isWriteLockOnCurrentThread() const
338	{
339	return RTCritSectIsOwner(&m->sem);
340	}
341
342	/virtual/ void WriteLockHandle::lockWrite(LOCKVAL_SRC_POS_DECL)
343	{
344	#ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
345	RTCritSectEnterDebug(&m->sem, (uintptr_t)ASMReturnAddress(), RT_SRC_POS_ARGS);
346	#else
347	RTCritSectEnter(&m->sem);
348	#endif
349	}
350
351	/virtual/ bool WriteLockHandle::isReadLockedOnCurrentThread(bool fWannaHear) const
352	{
353	RT_NOREF(fWannaHear);
354	return RTCritSectIsOwner(&m->sem);
355	}
356
357	/virtual/ void WriteLockHandle::unlockWrite()
358	{
359	RTCritSectLeave(&m->sem);
360	}
361
362	/virtual/ void WriteLockHandle::lockRead(LOCKVAL_SRC_POS_DECL)
363	{
364	lockWrite(LOCKVAL_SRC_POS_ARGS);
365	}
366
367	/virtual/ void WriteLockHandle::unlockRead()
368	{
369	unlockWrite();
370	}
371
372	/virtual/ uint32_t WriteLockHandle::writeLockLevel() const
373	{
374	return RTCritSectGetRecursion(&m->sem);
375	}
376
377	#ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
378	/virtual/ const char* WriteLockHandle::describe() const
379	{
380	return m->strDescription.c_str();
381	}
382	#endif
383
384	////////////////////////////////////////////////////////////////////////////////
385	//
386	// AutoLockBase
387	//
388	////////////////////////////////////////////////////////////////////////////////
389
390	typedef std::vector<LockHandle*> HandlesVector;
391
392	struct AutoLockBase::Data
393	{
394	Data(size_t cHandles
395	#ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
396	, const char *pcszFile_,
397	unsigned uLine_,
398	const char *pcszFunction_
399	#endif
400	)
401	: fIsLocked(false),
402	aHandles(cHandles) // size of array
403	#ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
404	, pcszFile(pcszFile_),
405	uLine(uLine_),
406	pcszFunction(pcszFunction_)
407	#endif
408	{
409	for (uint32_t i = 0; i < cHandles; ++i)
410	aHandles[i] = NULL;
411	}
412
413	bool fIsLocked; // if true, then all items in aHandles are locked by this AutoLock and
414	// need to be unlocked in the destructor
415	HandlesVector aHandles; // array (vector) of LockHandle instances; in the case of AutoWriteLock
416	// and AutoReadLock, there will only be one item on the list; with the
417	// AutoMulti* derivatives, there will be multiple
418
419	#ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
420	// information about where the lock occurred (passed down from the AutoLock classes)
421	const char *pcszFile;
422	unsigned uLine;
423	const char *pcszFunction;
424	#endif
425	};
426
427	AutoLockBase::AutoLockBase(uint32_t cHandles
428	COMMA_LOCKVAL_SRC_POS_DECL)
429	{
430	m = new Data(cHandles COMMA_LOCKVAL_SRC_POS_ARGS);
431	}
432
433	AutoLockBase::AutoLockBase(uint32_t cHandles,
434	LockHandle *pHandle
435	COMMA_LOCKVAL_SRC_POS_DECL)
436	{
437	Assert(cHandles == 1); NOREF(cHandles);
438	m = new Data(1 COMMA_LOCKVAL_SRC_POS_ARGS);
439	m->aHandles[0] = pHandle;
440	}
441
442	AutoLockBase::~AutoLockBase()
443	{
444	delete m;
445	}
446
447	/**
448	* Requests ownership of all contained lock handles by calling
449	* the pure virtual callLockImpl() function on each of them,
450	* which must be implemented by the descendant class; in the
451	* implementation, AutoWriteLock will request a write lock
452	* whereas AutoReadLock will request a read lock.
453	*
454	* Does not modify the lock counts in the member variables.
455	*/
456	void AutoLockBase::callLockOnAllHandles()
457	{
458	for (HandlesVector::iterator it = m->aHandles.begin();
459	it != m->aHandles.end();
460	++it)
461	{
462	LockHandle pHandle = it;
463	if (pHandle)
464	// call virtual function implemented in AutoWriteLock or AutoReadLock
465	this->callLockImpl(*pHandle);
466	}
467	}
468
469	/**
470	* Releases ownership of all contained lock handles by calling
471	* the pure virtual callUnlockImpl() function on each of them,
472	* which must be implemented by the descendant class; in the
473	* implementation, AutoWriteLock will release a write lock
474	* whereas AutoReadLock will release a read lock.
475	*
476	* Does not modify the lock counts in the member variables.
477	*/
478	void AutoLockBase::callUnlockOnAllHandles()
479	{
480	// unlock in reverse order!
481	for (HandlesVector::reverse_iterator it = m->aHandles.rbegin();
482	it != m->aHandles.rend();
483	++it)
484	{
485	LockHandle pHandle = it;
486	if (pHandle)
487	// call virtual function implemented in AutoWriteLock or AutoReadLock
488	this->callUnlockImpl(*pHandle);
489	}
490	}
491
492	/**
493	* Destructor implementation that can also be called explicitly, if required.
494	* Restores the exact state before the AutoLock was created; that is, unlocks
495	* all contained semaphores.
496	*/
497	void AutoLockBase::cleanup()
498	{
499	if (m->fIsLocked)
500	callUnlockOnAllHandles();
501	}
502
503	/**
504	* Requests ownership of all contained semaphores. Public method that can
505	* only be called once and that also gets called by the AutoLock constructors.
506	*/
507	void AutoLockBase::acquire()
508	{
509	AssertMsgReturnVoid(!m->fIsLocked, ("m->fIsLocked is true, attempting to lock twice!"));
510	callLockOnAllHandles();
511	m->fIsLocked = true;
512	}
513
514	/**
515	* Releases ownership of all contained semaphores. Public method.
516	*/
517	void AutoLockBase::release()
518	{
519	AssertMsgReturnVoid(m->fIsLocked, ("m->fIsLocked is false, cannot release!"));
520	callUnlockOnAllHandles();
521	m->fIsLocked = false;
522	}
523
524	////////////////////////////////////////////////////////////////////////////////
525	//
526	// AutoReadLock
527	//
528	////////////////////////////////////////////////////////////////////////////////
529
530	/**
531	* Release all read locks acquired by this instance through the #lock()
532	* call and destroys the instance.
533	*
534	* Note that if there there are nested #lock() calls without the
535	* corresponding number of #unlock() calls when the destructor is called, it
536	* will assert. This is because having an unbalanced number of nested locks
537	* is a program logic error which must be fixed.
538	*/
539	/virtual/ AutoReadLock::~AutoReadLock()
540	{
541	LockHandle *pHandle = m->aHandles[0];
542
543	if (pHandle)
544	{
545	if (m->fIsLocked)
546	callUnlockImpl(*pHandle);
547	}
548	}
549
550	/**
551	* Implementation of the pure virtual declared in AutoLockBase.
552	* This gets called by AutoLockBase.acquire() to actually request
553	* the semaphore; in the AutoReadLock implementation, we request
554	* the semaphore in read mode.
555	*/
556	/virtual/ void AutoReadLock::callLockImpl(LockHandle &l)
557	{
558	#ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
559	l.lockRead(m->pcszFile, m->uLine, m->pcszFunction);
560	#else
561	l.lockRead();
562	#endif
563	}
564
565	/**
566	* Implementation of the pure virtual declared in AutoLockBase.
567	* This gets called by AutoLockBase.release() to actually release
568	* the semaphore; in the AutoReadLock implementation, we release
569	* the semaphore in read mode.
570	*/
571	/virtual/ void AutoReadLock::callUnlockImpl(LockHandle &l)
572	{
573	l.unlockRead();
574	}
575
576	////////////////////////////////////////////////////////////////////////////////
577	//
578	// AutoWriteLockBase
579	//
580	////////////////////////////////////////////////////////////////////////////////
581
582	/**
583	* Implementation of the pure virtual declared in AutoLockBase.
584	* This gets called by AutoLockBase.acquire() to actually request
585	* the semaphore; in the AutoWriteLock implementation, we request
586	* the semaphore in write mode.
587	*/
588	/virtual/ void AutoWriteLockBase::callLockImpl(LockHandle &l)
589	{
590	#ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
591	l.lockWrite(m->pcszFile, m->uLine, m->pcszFunction);
592	#else
593	l.lockWrite();
594	#endif
595	}
596
597	/**
598	* Implementation of the pure virtual declared in AutoLockBase.
599	* This gets called by AutoLockBase.release() to actually release
600	* the semaphore; in the AutoWriteLock implementation, we release
601	* the semaphore in write mode.
602	*/
603	/virtual/ void AutoWriteLockBase::callUnlockImpl(LockHandle &l)
604	{
605	l.unlockWrite();
606	}
607
608	////////////////////////////////////////////////////////////////////////////////
609	//
610	// AutoWriteLock
611	//
612	////////////////////////////////////////////////////////////////////////////////
613
614	AutoWriteLock::AutoWriteLock(uint32_t cHandles,
615	LockHandle** pHandles
616	COMMA_LOCKVAL_SRC_POS_DECL)
617	: AutoWriteLockBase(cHandles
618	COMMA_LOCKVAL_SRC_POS_ARGS)
619	{
620	Assert(cHandles);
621	Assert(pHandles);
622
623	for (uint32_t i = 0; i < cHandles; ++i)
624	m->aHandles[i] = pHandles[i];
625
626	acquire();
627	}
628
629
630
631	/**
632	* Attaches another handle to this auto lock instance.
633	*
634	* The previous object's lock is completely released before the new one is
635	* acquired. The lock level of the new handle will be the same. This
636	* also means that if the lock was not acquired at all before #attach(), it
637	* will not be acquired on the new handle too.
638	*
639	* @param aHandle New handle to attach.
640	*/
641	void AutoWriteLock::attach(LockHandle *aHandle)
642	{
643	LockHandle *pHandle = m->aHandles[0];
644
645	/* detect simple self-reattachment */
646	if (pHandle != aHandle)
647	{
648	bool fWasLocked = m->fIsLocked;
649
650	cleanup();
651
652	m->aHandles[0] = aHandle;
653	m->fIsLocked = fWasLocked;
654
655	if (aHandle)
656	if (fWasLocked)
657	callLockImpl(*aHandle);
658	}
659	}
660
661	/**
662	* Returns @c true if the current thread holds a write lock on the managed
663	* read/write semaphore. Returns @c false if the managed semaphore is @c
664	* NULL.
665	*
666	* @note Intended for debugging only.
667	*/
668	bool AutoWriteLock::isWriteLockOnCurrentThread() const
669	{
670	return m->aHandles[0] ? m->aHandles[0]->isWriteLockOnCurrentThread() : false;
671	}
672
673	/**
674	* Returns the current write lock level of the managed semaphore. The lock
675	* level determines the number of nested #lock() calls on the given
676	* semaphore handle. Returns @c 0 if the managed semaphore is @c
677	* NULL.
678	*
679	* Note that this call is valid only when the current thread owns a write
680	* lock on the given semaphore handle and will assert otherwise.
681	*
682	* @note Intended for debugging only.
683	*/
684	uint32_t AutoWriteLock::writeLockLevel() const
685	{
686	return m->aHandles[0] ? m->aHandles[0]->writeLockLevel() : 0;
687	}
688
689	/**
690	* Returns @c true if the current thread holds a write lock on the managed
691	* read/write semaphore. Returns @c false if the managed semaphore is @c
692	* NULL.
693	*
694	* @note Intended for debugging only (esp. considering fWannaHear).
695	*/
696	bool AutoWriteLock::isReadLockedOnCurrentThread(bool fWannaHear) const
697	{
698	return m->aHandles[0] ? m->aHandles[0]->isReadLockedOnCurrentThread(fWannaHear) : false;
699	}
700
701	////////////////////////////////////////////////////////////////////////////////
702	//
703	// AutoMultiWriteLock*
704	//
705	////////////////////////////////////////////////////////////////////////////////
706
707	AutoMultiWriteLock2::AutoMultiWriteLock2(Lockable *pl1,
708	Lockable *pl2
709	COMMA_LOCKVAL_SRC_POS_DECL)
710	: AutoWriteLockBase(2
711	COMMA_LOCKVAL_SRC_POS_ARGS)
712	{
713	if (pl1)
714	m->aHandles[0] = pl1->lockHandle();
715	if (pl2)
716	m->aHandles[1] = pl2->lockHandle();
717	acquire();
718	}
719
720	AutoMultiWriteLock2::AutoMultiWriteLock2(LockHandle *pl1,
721	LockHandle *pl2
722	COMMA_LOCKVAL_SRC_POS_DECL)
723	: AutoWriteLockBase(2
724	COMMA_LOCKVAL_SRC_POS_ARGS)
725	{
726	m->aHandles[0] = pl1;
727	m->aHandles[1] = pl2;
728	acquire();
729	}
730
731	AutoMultiWriteLock3::AutoMultiWriteLock3(Lockable *pl1,
732	Lockable *pl2,
733	Lockable *pl3
734	COMMA_LOCKVAL_SRC_POS_DECL)
735	: AutoWriteLockBase(3
736	COMMA_LOCKVAL_SRC_POS_ARGS)
737	{
738	if (pl1)
739	m->aHandles[0] = pl1->lockHandle();
740	if (pl2)
741	m->aHandles[1] = pl2->lockHandle();
742	if (pl3)
743	m->aHandles[2] = pl3->lockHandle();
744	acquire();
745	}
746
747	AutoMultiWriteLock3::AutoMultiWriteLock3(LockHandle *pl1,
748	LockHandle *pl2,
749	LockHandle *pl3
750	COMMA_LOCKVAL_SRC_POS_DECL)
751	: AutoWriteLockBase(3
752	COMMA_LOCKVAL_SRC_POS_ARGS)
753	{
754	m->aHandles[0] = pl1;
755	m->aHandles[1] = pl2;
756	m->aHandles[2] = pl3;
757	acquire();
758	}
759
760	AutoMultiWriteLock4::AutoMultiWriteLock4(Lockable *pl1,
761	Lockable *pl2,
762	Lockable *pl3,
763	Lockable *pl4
764	COMMA_LOCKVAL_SRC_POS_DECL)
765	: AutoWriteLockBase(4
766	COMMA_LOCKVAL_SRC_POS_ARGS)
767	{
768	if (pl1)
769	m->aHandles[0] = pl1->lockHandle();
770	if (pl2)
771	m->aHandles[1] = pl2->lockHandle();
772	if (pl3)
773	m->aHandles[2] = pl3->lockHandle();
774	if (pl4)
775	m->aHandles[3] = pl4->lockHandle();
776	acquire();
777	}
778
779	AutoMultiWriteLock4::AutoMultiWriteLock4(LockHandle *pl1,
780	LockHandle *pl2,
781	LockHandle *pl3,
782	LockHandle *pl4
783	COMMA_LOCKVAL_SRC_POS_DECL)
784	: AutoWriteLockBase(4
785	COMMA_LOCKVAL_SRC_POS_ARGS)
786	{
787	m->aHandles[0] = pl1;
788	m->aHandles[1] = pl2;
789	m->aHandles[2] = pl3;
790	m->aHandles[3] = pl4;
791	acquire();
792	}
793
794	} /* namespace util */
795	/* vi: set tabstop=4 shiftwidth=4 expandtab: */

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source: vbox/trunk/src/VBox/Main/glue/AutoLock.cpp@ 105006

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