AutoLock.cpp@ 93948

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1	/* $Id: AutoLock.cpp 93115 2022-01-01 11:31:46Z vboxsync $ */
2	/** @file
3	* Automatic locks, implementation.
4	*/
5
6	/*
7	* Copyright (C) 2006-2022 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	{ LOCKCLASS_TRANSLATOR, "13-TRANSLATOR" }
91	};
92
93	RTLOCKVALCLASS hClass;
94	int vrc;
95	for (unsigned i = 0; i < RT_ELEMENTS(aClasses); ++i)
96	{
97	vrc = RTLockValidatorClassCreate(&hClass,
98	true, /fAutodidact/
99	RT_SRC_POS,
100	aClasses[i].pcszDescription);
101	AssertRC(vrc);
102
103	// teach the new class that the classes created previously can be held
104	// while the new class is being acquired
105	for (LockValidationClassesMap::iterator it = g_mapLockValidationClasses.begin();
106	it != g_mapLockValidationClasses.end();
107	++it)
108	{
109	RTLOCKVALCLASS &canBeHeld = it->second;
110	vrc = RTLockValidatorClassAddPriorClass(hClass,
111	canBeHeld);
112	AssertRC(vrc);
113	}
114
115	// and store the new class
116	g_mapLockValidationClasses[aClasses[i].cls] = hClass;
117	}
118
119	/* WriteLockHandle critsect1(LOCKCLASS_VIRTUALBOXOBJECT);
120	WriteLockHandle critsect2(LOCKCLASS_VIRTUALBOXLIST);
121
122	AutoWriteLock lock1(critsect1 COMMA_LOCKVAL_SRC_POS);
123	AutoWriteLock lock2(critsect2 COMMA_LOCKVAL_SRC_POS);*/
124	#endif
125	}
126
127	bool AutoLockHoldsLocksInClass(VBoxLockingClass lockClass)
128	{
129	#ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
130	return RTLockValidatorHoldsLocksInClass(NIL_RTTHREAD, g_mapLockValidationClasses[lockClass]);
131	#else
132	RT_NOREF(lockClass);
133	return false;
134	#endif
135	}
136
137	////////////////////////////////////////////////////////////////////////////////
138	//
139	// RWLockHandle
140	//
141	////////////////////////////////////////////////////////////////////////////////
142
143	struct RWLockHandle::Data
144	{
145	Data()
146	{ }
147
148	#ifdef GLUE_USE_CRITSECTRW
149	mutable RTCRITSECTRW CritSect;
150	#else
151	RTSEMRW sem;
152	#endif
153	VBoxLockingClass lockClass;
154
155	#ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
156	com::Utf8Str strDescription;
157	#endif
158	};
159
160	RWLockHandle::RWLockHandle(VBoxLockingClass lockClass)
161	{
162	m = new Data();
163
164	m->lockClass = lockClass;
165	#ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
166	m->strDescription = com::Utf8StrFmt("r/w %RCv", this);
167	#endif
168
169	#ifdef GLUE_USE_CRITSECTRW
170	# ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
171	int vrc = RTCritSectRwInitEx(&m->CritSect, 0 /fFlags/, g_mapLockValidationClasses[lockClass], RTLOCKVAL_SUB_CLASS_ANY, NULL);
172	# else
173	int vrc = RTCritSectRwInitEx(&m->CritSect, 0 /fFlags/, NIL_RTLOCKVALCLASS, RTLOCKVAL_SUB_CLASS_ANY, NULL);
174	# endif
175	#else
176	# ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
177	int vrc = RTSemRWCreateEx(&m->sem, 0 /fFlags/, g_mapLockValidationClasses[lockClass], RTLOCKVAL_SUB_CLASS_ANY, NULL);
178	# else
179	int vrc = RTSemRWCreateEx(&m->sem, 0 /fFlags/, NIL_RTLOCKVALCLASS, RTLOCKVAL_SUB_CLASS_ANY, NULL);
180	# endif
181	#endif
182	AssertRC(vrc);
183	}
184
185	/virtual/ RWLockHandle::~RWLockHandle()
186	{
187	#ifdef GLUE_USE_CRITSECTRW
188	RTCritSectRwDelete(&m->CritSect);
189	#else
190	RTSemRWDestroy(m->sem);
191	#endif
192	delete m;
193	}
194
195	/virtual/ bool RWLockHandle::isWriteLockOnCurrentThread() const
196	{
197	#ifdef GLUE_USE_CRITSECTRW
198	return RTCritSectRwIsWriteOwner(&m->CritSect);
199	#else
200	return RTSemRWIsWriteOwner(m->sem);
201	#endif
202	}
203
204	/virtual/ void RWLockHandle::lockWrite(LOCKVAL_SRC_POS_DECL)
205	{
206	#ifdef GLUE_USE_CRITSECTRW
207	# ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
208	int vrc = RTCritSectRwEnterExclDebug(&m->CritSect, (uintptr_t)ASMReturnAddress(), RT_SRC_POS_ARGS);
209	# else
210	int vrc = RTCritSectRwEnterExcl(&m->CritSect);
211	# endif
212	#else
213	# ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
214	int vrc = RTSemRWRequestWriteDebug(m->sem, RT_INDEFINITE_WAIT, (uintptr_t)ASMReturnAddress(), RT_SRC_POS_ARGS);
215	# else
216	int vrc = RTSemRWRequestWrite(m->sem, RT_INDEFINITE_WAIT);
217	# endif
218	#endif
219	AssertRC(vrc);
220	}
221
222	/virtual/ void RWLockHandle::unlockWrite()
223	{
224	#ifdef GLUE_USE_CRITSECTRW
225	int vrc = RTCritSectRwLeaveExcl(&m->CritSect);
226	#else
227	int vrc = RTSemRWReleaseWrite(m->sem);
228	#endif
229	AssertRC(vrc);
230
231	}
232
233	/virtual/ bool RWLockHandle::isReadLockedOnCurrentThread(bool fWannaHear) const
234	{
235	#ifdef GLUE_USE_CRITSECTRW
236	return RTCritSectRwIsReadOwner(&m->CritSect, fWannaHear);
237	#else
238	return RTSemRWIsReadOwner(m->sem, fWannaHear);
239	#endif
240	}
241
242	/virtual/ void RWLockHandle::lockRead(LOCKVAL_SRC_POS_DECL)
243	{
244	#ifdef GLUE_USE_CRITSECTRW
245	# ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
246	int vrc = RTCritSectRwEnterSharedDebug(&m->CritSect, (uintptr_t)ASMReturnAddress(), RT_SRC_POS_ARGS);
247	# else
248	int vrc = RTCritSectRwEnterShared(&m->CritSect);
249	# endif
250	#else
251	# ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
252	int vrc = RTSemRWRequestReadDebug(m->sem, RT_INDEFINITE_WAIT, (uintptr_t)ASMReturnAddress(), RT_SRC_POS_ARGS);
253	# else
254	int vrc = RTSemRWRequestRead(m->sem, RT_INDEFINITE_WAIT);
255	# endif
256	#endif
257	AssertRC(vrc);
258	}
259
260	/virtual/ void RWLockHandle::unlockRead()
261	{
262	#ifdef GLUE_USE_CRITSECTRW
263	int vrc = RTCritSectRwLeaveShared(&m->CritSect);
264	#else
265	int vrc = RTSemRWReleaseRead(m->sem);
266	#endif
267	AssertRC(vrc);
268	}
269
270	/virtual/ uint32_t RWLockHandle::writeLockLevel() const
271	{
272	/* Note! This does not include read recursions done by the writer! */
273	#ifdef GLUE_USE_CRITSECTRW
274	return RTCritSectRwGetWriteRecursion(&m->CritSect);
275	#else
276	return RTSemRWGetWriteRecursion(m->sem);
277	#endif
278	}
279
280	#ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
281	/virtual/ const char* RWLockHandle::describe() const
282	{
283	return m->strDescription.c_str();
284	}
285	#endif
286
287	////////////////////////////////////////////////////////////////////////////////
288	//
289	// WriteLockHandle
290	//
291	////////////////////////////////////////////////////////////////////////////////
292
293	struct WriteLockHandle::Data
294	{
295	Data()
296	{ }
297
298	mutable RTCRITSECT sem;
299	VBoxLockingClass lockClass;
300
301	#ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
302	com::Utf8Str strDescription;
303	#endif
304	};
305
306	WriteLockHandle::WriteLockHandle(VBoxLockingClass lockClass)
307	{
308	m = new Data;
309
310	m->lockClass = lockClass;
311
312	#ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
313	m->strDescription = com::Utf8StrFmt("crit %RCv", this);
314	int vrc = RTCritSectInitEx(&m->sem, 0/fFlags/, g_mapLockValidationClasses[lockClass], RTLOCKVAL_SUB_CLASS_ANY, NULL);
315	#else
316	int vrc = RTCritSectInitEx(&m->sem, 0/fFlags/, NIL_RTLOCKVALCLASS, RTLOCKVAL_SUB_CLASS_ANY, NULL);
317	#endif
318	AssertRC(vrc);
319	}
320
321	WriteLockHandle::~WriteLockHandle()
322	{
323	RTCritSectDelete(&m->sem);
324	delete m;
325	}
326
327	/virtual/ bool WriteLockHandle::isWriteLockOnCurrentThread() const
328	{
329	return RTCritSectIsOwner(&m->sem);
330	}
331
332	/virtual/ void WriteLockHandle::lockWrite(LOCKVAL_SRC_POS_DECL)
333	{
334	#ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
335	RTCritSectEnterDebug(&m->sem, (uintptr_t)ASMReturnAddress(), RT_SRC_POS_ARGS);
336	#else
337	RTCritSectEnter(&m->sem);
338	#endif
339	}
340
341	/virtual/ bool WriteLockHandle::isReadLockedOnCurrentThread(bool fWannaHear) const
342	{
343	RT_NOREF(fWannaHear);
344	return RTCritSectIsOwner(&m->sem);
345	}
346
347	/virtual/ void WriteLockHandle::unlockWrite()
348	{
349	RTCritSectLeave(&m->sem);
350	}
351
352	/virtual/ void WriteLockHandle::lockRead(LOCKVAL_SRC_POS_DECL)
353	{
354	lockWrite(LOCKVAL_SRC_POS_ARGS);
355	}
356
357	/virtual/ void WriteLockHandle::unlockRead()
358	{
359	unlockWrite();
360	}
361
362	/virtual/ uint32_t WriteLockHandle::writeLockLevel() const
363	{
364	return RTCritSectGetRecursion(&m->sem);
365	}
366
367	#ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
368	/virtual/ const char* WriteLockHandle::describe() const
369	{
370	return m->strDescription.c_str();
371	}
372	#endif
373
374	////////////////////////////////////////////////////////////////////////////////
375	//
376	// AutoLockBase
377	//
378	////////////////////////////////////////////////////////////////////////////////
379
380	typedef std::vector<LockHandle*> HandlesVector;
381
382	struct AutoLockBase::Data
383	{
384	Data(size_t cHandles
385	#ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
386	, const char *pcszFile_,
387	unsigned uLine_,
388	const char *pcszFunction_
389	#endif
390	)
391	: fIsLocked(false),
392	aHandles(cHandles) // size of array
393	#ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
394	, pcszFile(pcszFile_),
395	uLine(uLine_),
396	pcszFunction(pcszFunction_)
397	#endif
398	{
399	for (uint32_t i = 0; i < cHandles; ++i)
400	aHandles[i] = NULL;
401	}
402
403	bool fIsLocked; // if true, then all items in aHandles are locked by this AutoLock and
404	// need to be unlocked in the destructor
405	HandlesVector aHandles; // array (vector) of LockHandle instances; in the case of AutoWriteLock
406	// and AutoReadLock, there will only be one item on the list; with the
407	// AutoMulti* derivatives, there will be multiple
408
409	#ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
410	// information about where the lock occurred (passed down from the AutoLock classes)
411	const char *pcszFile;
412	unsigned uLine;
413	const char *pcszFunction;
414	#endif
415	};
416
417	AutoLockBase::AutoLockBase(uint32_t cHandles
418	COMMA_LOCKVAL_SRC_POS_DECL)
419	{
420	m = new Data(cHandles COMMA_LOCKVAL_SRC_POS_ARGS);
421	}
422
423	AutoLockBase::AutoLockBase(uint32_t cHandles,
424	LockHandle *pHandle
425	COMMA_LOCKVAL_SRC_POS_DECL)
426	{
427	Assert(cHandles == 1); NOREF(cHandles);
428	m = new Data(1 COMMA_LOCKVAL_SRC_POS_ARGS);
429	m->aHandles[0] = pHandle;
430	}
431
432	AutoLockBase::~AutoLockBase()
433	{
434	delete m;
435	}
436
437	/**
438	* Requests ownership of all contained lock handles by calling
439	* the pure virtual callLockImpl() function on each of them,
440	* which must be implemented by the descendant class; in the
441	* implementation, AutoWriteLock will request a write lock
442	* whereas AutoReadLock will request a read lock.
443	*
444	* Does not modify the lock counts in the member variables.
445	*/
446	void AutoLockBase::callLockOnAllHandles()
447	{
448	for (HandlesVector::iterator it = m->aHandles.begin();
449	it != m->aHandles.end();
450	++it)
451	{
452	LockHandle pHandle = it;
453	if (pHandle)
454	// call virtual function implemented in AutoWriteLock or AutoReadLock
455	this->callLockImpl(*pHandle);
456	}
457	}
458
459	/**
460	* Releases ownership of all contained lock handles by calling
461	* the pure virtual callUnlockImpl() function on each of them,
462	* which must be implemented by the descendant class; in the
463	* implementation, AutoWriteLock will release a write lock
464	* whereas AutoReadLock will release a read lock.
465	*
466	* Does not modify the lock counts in the member variables.
467	*/
468	void AutoLockBase::callUnlockOnAllHandles()
469	{
470	// unlock in reverse order!
471	for (HandlesVector::reverse_iterator it = m->aHandles.rbegin();
472	it != m->aHandles.rend();
473	++it)
474	{
475	LockHandle pHandle = it;
476	if (pHandle)
477	// call virtual function implemented in AutoWriteLock or AutoReadLock
478	this->callUnlockImpl(*pHandle);
479	}
480	}
481
482	/**
483	* Destructor implementation that can also be called explicitly, if required.
484	* Restores the exact state before the AutoLock was created; that is, unlocks
485	* all contained semaphores.
486	*/
487	void AutoLockBase::cleanup()
488	{
489	if (m->fIsLocked)
490	callUnlockOnAllHandles();
491	}
492
493	/**
494	* Requests ownership of all contained semaphores. Public method that can
495	* only be called once and that also gets called by the AutoLock constructors.
496	*/
497	void AutoLockBase::acquire()
498	{
499	AssertMsgReturnVoid(!m->fIsLocked, ("m->fIsLocked is true, attempting to lock twice!"));
500	callLockOnAllHandles();
501	m->fIsLocked = true;
502	}
503
504	/**
505	* Releases ownership of all contained semaphores. Public method.
506	*/
507	void AutoLockBase::release()
508	{
509	AssertMsgReturnVoid(m->fIsLocked, ("m->fIsLocked is false, cannot release!"));
510	callUnlockOnAllHandles();
511	m->fIsLocked = false;
512	}
513
514	////////////////////////////////////////////////////////////////////////////////
515	//
516	// AutoReadLock
517	//
518	////////////////////////////////////////////////////////////////////////////////
519
520	/**
521	* Release all read locks acquired by this instance through the #lock()
522	* call and destroys the instance.
523	*
524	* Note that if there there are nested #lock() calls without the
525	* corresponding number of #unlock() calls when the destructor is called, it
526	* will assert. This is because having an unbalanced number of nested locks
527	* is a program logic error which must be fixed.
528	*/
529	/virtual/ AutoReadLock::~AutoReadLock()
530	{
531	LockHandle *pHandle = m->aHandles[0];
532
533	if (pHandle)
534	{
535	if (m->fIsLocked)
536	callUnlockImpl(*pHandle);
537	}
538	}
539
540	/**
541	* Implementation of the pure virtual declared in AutoLockBase.
542	* This gets called by AutoLockBase.acquire() to actually request
543	* the semaphore; in the AutoReadLock implementation, we request
544	* the semaphore in read mode.
545	*/
546	/virtual/ void AutoReadLock::callLockImpl(LockHandle &l)
547	{
548	#ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
549	l.lockRead(m->pcszFile, m->uLine, m->pcszFunction);
550	#else
551	l.lockRead();
552	#endif
553	}
554
555	/**
556	* Implementation of the pure virtual declared in AutoLockBase.
557	* This gets called by AutoLockBase.release() to actually release
558	* the semaphore; in the AutoReadLock implementation, we release
559	* the semaphore in read mode.
560	*/
561	/virtual/ void AutoReadLock::callUnlockImpl(LockHandle &l)
562	{
563	l.unlockRead();
564	}
565
566	////////////////////////////////////////////////////////////////////////////////
567	//
568	// AutoWriteLockBase
569	//
570	////////////////////////////////////////////////////////////////////////////////
571
572	/**
573	* Implementation of the pure virtual declared in AutoLockBase.
574	* This gets called by AutoLockBase.acquire() to actually request
575	* the semaphore; in the AutoWriteLock implementation, we request
576	* the semaphore in write mode.
577	*/
578	/virtual/ void AutoWriteLockBase::callLockImpl(LockHandle &l)
579	{
580	#ifdef VBOX_WITH_MAIN_LOCK_VALIDATION
581	l.lockWrite(m->pcszFile, m->uLine, m->pcszFunction);
582	#else
583	l.lockWrite();
584	#endif
585	}
586
587	/**
588	* Implementation of the pure virtual declared in AutoLockBase.
589	* This gets called by AutoLockBase.release() to actually release
590	* the semaphore; in the AutoWriteLock implementation, we release
591	* the semaphore in write mode.
592	*/
593	/virtual/ void AutoWriteLockBase::callUnlockImpl(LockHandle &l)
594	{
595	l.unlockWrite();
596	}
597
598	////////////////////////////////////////////////////////////////////////////////
599	//
600	// AutoWriteLock
601	//
602	////////////////////////////////////////////////////////////////////////////////
603
604	AutoWriteLock::AutoWriteLock(uint32_t cHandles,
605	LockHandle** pHandles
606	COMMA_LOCKVAL_SRC_POS_DECL)
607	: AutoWriteLockBase(cHandles
608	COMMA_LOCKVAL_SRC_POS_ARGS)
609	{
610	Assert(cHandles);
611	Assert(pHandles);
612
613	for (uint32_t i = 0; i < cHandles; ++i)
614	m->aHandles[i] = pHandles[i];
615
616	acquire();
617	}
618
619
620
621	/**
622	* Attaches another handle to this auto lock instance.
623	*
624	* The previous object's lock is completely released before the new one is
625	* acquired. The lock level of the new handle will be the same. This
626	* also means that if the lock was not acquired at all before #attach(), it
627	* will not be acquired on the new handle too.
628	*
629	* @param aHandle New handle to attach.
630	*/
631	void AutoWriteLock::attach(LockHandle *aHandle)
632	{
633	LockHandle *pHandle = m->aHandles[0];
634
635	/* detect simple self-reattachment */
636	if (pHandle != aHandle)
637	{
638	bool fWasLocked = m->fIsLocked;
639
640	cleanup();
641
642	m->aHandles[0] = aHandle;
643	m->fIsLocked = fWasLocked;
644
645	if (aHandle)
646	if (fWasLocked)
647	callLockImpl(*aHandle);
648	}
649	}
650
651	/**
652	* Returns @c true if the current thread holds a write lock on the managed
653	* read/write semaphore. Returns @c false if the managed semaphore is @c
654	* NULL.
655	*
656	* @note Intended for debugging only.
657	*/
658	bool AutoWriteLock::isWriteLockOnCurrentThread() const
659	{
660	return m->aHandles[0] ? m->aHandles[0]->isWriteLockOnCurrentThread() : false;
661	}
662
663	/**
664	* Returns the current write lock level of the managed semaphore. The lock
665	* level determines the number of nested #lock() calls on the given
666	* semaphore handle. Returns @c 0 if the managed semaphore is @c
667	* NULL.
668	*
669	* Note that this call is valid only when the current thread owns a write
670	* lock on the given semaphore handle and will assert otherwise.
671	*
672	* @note Intended for debugging only.
673	*/
674	uint32_t AutoWriteLock::writeLockLevel() const
675	{
676	return m->aHandles[0] ? m->aHandles[0]->writeLockLevel() : 0;
677	}
678
679	/**
680	* Returns @c true if the current thread holds a write lock on the managed
681	* read/write semaphore. Returns @c false if the managed semaphore is @c
682	* NULL.
683	*
684	* @note Intended for debugging only (esp. considering fWannaHear).
685	*/
686	bool AutoWriteLock::isReadLockedOnCurrentThread(bool fWannaHear) const
687	{
688	return m->aHandles[0] ? m->aHandles[0]->isReadLockedOnCurrentThread(fWannaHear) : false;
689	}
690
691	////////////////////////////////////////////////////////////////////////////////
692	//
693	// AutoMultiWriteLock*
694	//
695	////////////////////////////////////////////////////////////////////////////////
696
697	AutoMultiWriteLock2::AutoMultiWriteLock2(Lockable *pl1,
698	Lockable *pl2
699	COMMA_LOCKVAL_SRC_POS_DECL)
700	: AutoWriteLockBase(2
701	COMMA_LOCKVAL_SRC_POS_ARGS)
702	{
703	if (pl1)
704	m->aHandles[0] = pl1->lockHandle();
705	if (pl2)
706	m->aHandles[1] = pl2->lockHandle();
707	acquire();
708	}
709
710	AutoMultiWriteLock2::AutoMultiWriteLock2(LockHandle *pl1,
711	LockHandle *pl2
712	COMMA_LOCKVAL_SRC_POS_DECL)
713	: AutoWriteLockBase(2
714	COMMA_LOCKVAL_SRC_POS_ARGS)
715	{
716	m->aHandles[0] = pl1;
717	m->aHandles[1] = pl2;
718	acquire();
719	}
720
721	AutoMultiWriteLock3::AutoMultiWriteLock3(Lockable *pl1,
722	Lockable *pl2,
723	Lockable *pl3
724	COMMA_LOCKVAL_SRC_POS_DECL)
725	: AutoWriteLockBase(3
726	COMMA_LOCKVAL_SRC_POS_ARGS)
727	{
728	if (pl1)
729	m->aHandles[0] = pl1->lockHandle();
730	if (pl2)
731	m->aHandles[1] = pl2->lockHandle();
732	if (pl3)
733	m->aHandles[2] = pl3->lockHandle();
734	acquire();
735	}
736
737	AutoMultiWriteLock3::AutoMultiWriteLock3(LockHandle *pl1,
738	LockHandle *pl2,
739	LockHandle *pl3
740	COMMA_LOCKVAL_SRC_POS_DECL)
741	: AutoWriteLockBase(3
742	COMMA_LOCKVAL_SRC_POS_ARGS)
743	{
744	m->aHandles[0] = pl1;
745	m->aHandles[1] = pl2;
746	m->aHandles[2] = pl3;
747	acquire();
748	}
749
750	AutoMultiWriteLock4::AutoMultiWriteLock4(Lockable *pl1,
751	Lockable *pl2,
752	Lockable *pl3,
753	Lockable *pl4
754	COMMA_LOCKVAL_SRC_POS_DECL)
755	: AutoWriteLockBase(4
756	COMMA_LOCKVAL_SRC_POS_ARGS)
757	{
758	if (pl1)
759	m->aHandles[0] = pl1->lockHandle();
760	if (pl2)
761	m->aHandles[1] = pl2->lockHandle();
762	if (pl3)
763	m->aHandles[2] = pl3->lockHandle();
764	if (pl4)
765	m->aHandles[3] = pl4->lockHandle();
766	acquire();
767	}
768
769	AutoMultiWriteLock4::AutoMultiWriteLock4(LockHandle *pl1,
770	LockHandle *pl2,
771	LockHandle *pl3,
772	LockHandle *pl4
773	COMMA_LOCKVAL_SRC_POS_DECL)
774	: AutoWriteLockBase(4
775	COMMA_LOCKVAL_SRC_POS_ARGS)
776	{
777	m->aHandles[0] = pl1;
778	m->aHandles[1] = pl2;
779	m->aHandles[2] = pl3;
780	m->aHandles[3] = pl4;
781	acquire();
782	}
783
784	} /* namespace util */
785	/* vi: set tabstop=4 shiftwidth=4 expandtab: */

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source: vbox/trunk/src/VBox/Main/glue/AutoLock.cpp@ 93948

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