PDMAllCritSect.cpp@ 37583

Last change on this file since 37583 was 37583, checked in by vboxsync, 14 years ago
removed left over code
Property svn:eol-style set to `native` Property svn:keywords set to `Id`
File size: 25.5 KB

Line
1	/* $Id: PDMAllCritSect.cpp 37583 2011-06-22 09:50:27Z vboxsync $ */
2	/** @file
3	* PDM - Critical Sections, All Contexts.
4	*/
5
6	/*
7	* Copyright (C) 2006-2007 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	* Header Files *
21	*******************************************************************************/
22	#define LOG_GROUP LOG_GROUP_PDM//_CRITSECT
23	#include "PDMInternal.h"
24	#include <VBox/vmm/pdmcritsect.h>
25	#include <VBox/vmm/mm.h>
26	#include <VBox/vmm/vmm.h>
27	#include <VBox/vmm/vm.h>
28	#include <VBox/err.h>
29	#include <VBox/vmm/hwaccm.h>
30
31	#include <VBox/log.h>
32	#include <iprt/asm.h>
33	#include <iprt/asm-amd64-x86.h>
34	#include <iprt/assert.h>
35	#ifdef IN_RING3
36	# include <iprt/lockvalidator.h>
37	# include <iprt/semaphore.h>
38	#endif
39	#if defined(IN_RING3) \|\| defined(IN_RING0)
40	# include <iprt/thread.h>
41	#endif
42
43
44	/*******************************************************************************
45	* Defined Constants And Macros *
46	*******************************************************************************/
47	/** The number loops to spin for in ring-3. */
48	#define PDMCRITSECT_SPIN_COUNT_R3 20
49	/** The number loops to spin for in ring-0. */
50	#define PDMCRITSECT_SPIN_COUNT_R0 256
51	/** The number loops to spin for in the raw-mode context. */
52	#define PDMCRITSECT_SPIN_COUNT_RC 256
53
54
55	/* Undefine the automatic VBOX_STRICT API mappings. */
56	#undef PDMCritSectEnter
57	#undef PDMCritSectTryEnter
58
59
60	/**
61	* Gets the ring-3 native thread handle of the calling thread.
62	*
63	* @returns native thread handle (ring-3).
64	* @param pCritSect The critical section. This is used in R0 and RC.
65	*/
66	DECL_FORCE_INLINE(RTNATIVETHREAD) pdmCritSectGetNativeSelf(PCPDMCRITSECT pCritSect)
67	{
68	#ifdef IN_RING3
69	NOREF(pCritSect);
70	RTNATIVETHREAD hNativeSelf = RTThreadNativeSelf();
71	#else
72	AssertMsgReturn(pCritSect->s.Core.u32Magic == RTCRITSECT_MAGIC, ("%RX32\n", pCritSect->s.Core.u32Magic),
73	NIL_RTNATIVETHREAD);
74	PVM pVM = pCritSect->s.CTX_SUFF(pVM); AssertPtr(pVM);
75	PVMCPU pVCpu = VMMGetCpu(pVM); AssertPtr(pVCpu);
76	RTNATIVETHREAD hNativeSelf = pVCpu->hNativeThread; Assert(hNativeSelf != NIL_RTNATIVETHREAD);
77	#endif
78	return hNativeSelf;
79	}
80
81
82	/**
83	* Tail code called when we've won the battle for the lock.
84	*
85	* @returns VINF_SUCCESS.
86	*
87	* @param pCritSect The critical section.
88	* @param hNativeSelf The native handle of this thread.
89	*/
90	DECL_FORCE_INLINE(int) pdmCritSectEnterFirst(PPDMCRITSECT pCritSect, RTNATIVETHREAD hNativeSelf, PCRTLOCKVALSRCPOS pSrcPos)
91	{
92	AssertMsg(pCritSect->s.Core.NativeThreadOwner == NIL_RTNATIVETHREAD, ("NativeThreadOwner=%p\n", pCritSect->s.Core.NativeThreadOwner));
93	Assert(!(pCritSect->s.Core.fFlags & PDMCRITSECT_FLAGS_PENDING_UNLOCK));
94
95	ASMAtomicWriteS32(&pCritSect->s.Core.cNestings, 1);
96	Assert(pCritSect->s.Core.cNestings == 1);
97	ASMAtomicWriteHandle(&pCritSect->s.Core.NativeThreadOwner, hNativeSelf);
98
99	# ifdef PDMCRITSECT_STRICT
100	RTLockValidatorRecExclSetOwner(pCritSect->s.Core.pValidatorRec, NIL_RTTHREAD, pSrcPos, true);
101	# endif
102
103	STAM_PROFILE_ADV_START(&pCritSect->s.StatLocked, l);
104	return VINF_SUCCESS;
105	}
106
107
108	#if defined(IN_RING3) \|\| defined(IN_RING0)
109	/**
110	* Deals with the contended case in ring-3 and ring-0.
111	*
112	* @returns VINF_SUCCESS or VERR_SEM_DESTROYED.
113	* @param pCritSect The critsect.
114	* @param hNativeSelf The native thread handle.
115	*/
116	static int pdmR3R0CritSectEnterContended(PPDMCRITSECT pCritSect, RTNATIVETHREAD hNativeSelf, PCRTLOCKVALSRCPOS pSrcPos)
117	{
118	/*
119	* Start waiting.
120	*/
121	if (ASMAtomicIncS32(&pCritSect->s.Core.cLockers) == 0)
122	return pdmCritSectEnterFirst(pCritSect, hNativeSelf, pSrcPos);
123	# ifdef IN_RING3
124	STAM_COUNTER_INC(&pCritSect->s.StatContentionR3);
125	# else
126	STAM_COUNTER_INC(&pCritSect->s.StatContentionRZLock);
127	# endif
128
129	/*
130	* The wait loop.
131	*/
132	PSUPDRVSESSION pSession = pCritSect->s.CTX_SUFF(pVM)->pSession;
133	SUPSEMEVENT hEvent = (SUPSEMEVENT)pCritSect->s.Core.EventSem;
134	# ifdef IN_RING3
135	# ifdef PDMCRITSECT_STRICT
136	RTTHREAD hThreadSelf = RTThreadSelfAutoAdopt();
137	int rc2 = RTLockValidatorRecExclCheckOrder(pCritSect->s.Core.pValidatorRec, hThreadSelf, pSrcPos, RT_INDEFINITE_WAIT);
138	if (RT_FAILURE(rc2))
139	return rc2;
140	# else
141	RTTHREAD hThreadSelf = RTThreadSelf();
142	# endif
143	# endif
144	for (;;)
145	{
146	# ifdef PDMCRITSECT_STRICT
147	int rc9 = RTLockValidatorRecExclCheckBlocking(pCritSect->s.Core.pValidatorRec, hThreadSelf, pSrcPos,
148	!(pCritSect->s.Core.fFlags & RTCRITSECT_FLAGS_NO_NESTING),
149	RT_INDEFINITE_WAIT, RTTHREADSTATE_CRITSECT, true);
150	if (RT_FAILURE(rc9))
151	return rc9;
152	# elif defined(IN_RING3)
153	RTThreadBlocking(hThreadSelf, RTTHREADSTATE_CRITSECT, true);
154	# endif
155	int rc = SUPSemEventWaitNoResume(pSession, hEvent, RT_INDEFINITE_WAIT);
156	# ifdef IN_RING3
157	RTThreadUnblocked(hThreadSelf, RTTHREADSTATE_CRITSECT);
158	# endif
159
160	if (RT_UNLIKELY(pCritSect->s.Core.u32Magic != RTCRITSECT_MAGIC))
161	return VERR_SEM_DESTROYED;
162	if (rc == VINF_SUCCESS)
163	return pdmCritSectEnterFirst(pCritSect, hNativeSelf, pSrcPos);
164	AssertMsg(rc == VERR_INTERRUPTED, ("rc=%Rrc\n", rc));
165	}
166	/* won't get here */
167	}
168	#endif /* IN_RING3 \|\| IN_RING0 */
169
170
171	/**
172	* Common worker for the debug and normal APIs.
173	*
174	* @returns VINF_SUCCESS if entered successfully.
175	* @returns rcBusy when encountering a busy critical section in GC/R0.
176	* @returns VERR_SEM_DESTROYED if the critical section is dead.
177	*
178	* @param pCritSect The PDM critical section to enter.
179	* @param rcBusy The status code to return when we're in GC or R0
180	* and the section is busy.
181	*/
182	DECL_FORCE_INLINE(int) pdmCritSectEnter(PPDMCRITSECT pCritSect, int rcBusy, PCRTLOCKVALSRCPOS pSrcPos)
183	{
184	Assert(pCritSect->s.Core.cNestings < 8); /* useful to catch incorrect locking */
185	Assert(pCritSect->s.Core.cNestings >= 0);
186
187	/*
188	* If the critical section has already been destroyed, then inform the caller.
189	*/
190	AssertMsgReturn(pCritSect->s.Core.u32Magic == RTCRITSECT_MAGIC,
191	("%p %RX32\n", pCritSect, pCritSect->s.Core.u32Magic),
192	VERR_SEM_DESTROYED);
193
194	/*
195	* See if we're lucky.
196	*/
197	/* NOP ... */
198	if (pCritSect->s.Core.fFlags & RTCRITSECT_FLAGS_NOP)
199	return VINF_SUCCESS;
200
201	RTNATIVETHREAD hNativeSelf = pdmCritSectGetNativeSelf(pCritSect);
202	/* ... not owned ... */
203	if (ASMAtomicCmpXchgS32(&pCritSect->s.Core.cLockers, 0, -1))
204	return pdmCritSectEnterFirst(pCritSect, hNativeSelf, pSrcPos);
205
206	/* ... or nested. */
207	if (pCritSect->s.Core.NativeThreadOwner == hNativeSelf)
208	{
209	ASMAtomicIncS32(&pCritSect->s.Core.cLockers);
210	ASMAtomicIncS32(&pCritSect->s.Core.cNestings);
211	Assert(pCritSect->s.Core.cNestings > 1);
212	return VINF_SUCCESS;
213	}
214
215	/*
216	* Spin for a bit without incrementing the counter.
217	*/
218	/** @todo Move this to cfgm variables since it doesn't make sense to spin on UNI
219	* cpu systems. */
220	int32_t cSpinsLeft = CTX_SUFF(PDMCRITSECT_SPIN_COUNT_);
221	while (cSpinsLeft-- > 0)
222	{
223	if (ASMAtomicCmpXchgS32(&pCritSect->s.Core.cLockers, 0, -1))
224	return pdmCritSectEnterFirst(pCritSect, hNativeSelf, pSrcPos);
225	ASMNopPause();
226	/** @todo Should use monitor/mwait on e.g. &cLockers here, possibly with a
227	cli'ed pendingpreemption check up front using sti w/ instruction fusing
228	for avoiding races. Hmm ... This is assuming the other party is actually
229	executing code on another CPU ... which we could keep track of if we
230	wanted. */
231	}
232
233	#ifdef IN_RING3
234	/*
235	* Take the slow path.
236	*/
237	return pdmR3R0CritSectEnterContended(pCritSect, hNativeSelf, pSrcPos);
238
239	#else
240	# ifdef IN_RING0
241	/** @todo If preemption is disabled it means we're in VT-x/AMD-V context
242	* and would be better off switching out of that while waiting for
243	* the lock. Several of the locks jumps back to ring-3 just to
244	* get the lock, the ring-3 code will then call the kernel to do
245	* the lock wait and when the call return it will call ring-0
246	* again and resume via in setjmp style. Not very efficient. */
247	# if 0
248	if (ASMIntAreEnabled()) /** @todo this can be handled as well by changing
249	* callers not prepared for longjmp/blocking to
250	* use PDMCritSectTryEnter. */
251	{
252	/*
253	* Leave HWACCM context while waiting if necessary.
254	*/
255	int rc;
256	if (RTThreadPreemptIsEnabled(NIL_RTTHREAD))
257	{
258	STAM_REL_COUNTER_ADD(&pCritSect->s.StatContentionRZLock, 1000000);
259	rc = pdmR3R0CritSectEnterContended(pCritSect, hNativeSelf, pSrcPos);
260	}
261	else
262	{
263	STAM_REL_COUNTER_ADD(&pCritSect->s.StatContentionRZLock, 1000000000);
264	PVM pVM = pCritSect->s.CTX_SUFF(pVM);
265	PVMCPU pVCpu = VMMGetCpu(pVM);
266	HWACCMR0Leave(pVM, pVCpu);
267	RTThreadPreemptRestore(NIL_RTTHREAD, ????);
268
269	rc = pdmR3R0CritSectEnterContended(pCritSect, hNativeSelf, pSrcPos);
270
271	RTThreadPreemptDisable(NIL_RTTHREAD, ????);
272	HWACCMR0Enter(pVM, pVCpu);
273	}
274	return rc;
275	}
276	# else
277	/*
278	* We preemption hasn't been disabled, we can block here in ring-0.
279	*/
280	if ( RTThreadPreemptIsEnabled(NIL_RTTHREAD)
281	&& ASMIntAreEnabled())
282	return pdmR3R0CritSectEnterContended(pCritSect, hNativeSelf, pSrcPos);
283	# endif
284	#endif /* IN_RING0 */
285
286	STAM_REL_COUNTER_INC(&pCritSect->s.StatContentionRZLock);
287
288	/*
289	* Call ring-3 to acquire the critical section?
290	*/
291	if (rcBusy == VINF_SUCCESS)
292	{
293	PVM pVM = pCritSect->s.CTX_SUFF(pVM); AssertPtr(pVM);
294	PVMCPU pVCpu = VMMGetCpu(pVM); AssertPtr(pVCpu);
295	return VMMRZCallRing3(pVM, pVCpu, VMMCALLRING3_PDM_CRIT_SECT_ENTER, MMHyperCCToR3(pVM, pCritSect));
296	}
297
298	/*
299	* Return busy.
300	*/
301	LogFlow(("PDMCritSectEnter: locked => R3 (%Rrc)\n", rcBusy));
302	return rcBusy;
303	#endif /* !IN_RING3 */
304	}
305
306
307	/**
308	* Enters a PDM critical section.
309	*
310	* @returns VINF_SUCCESS if entered successfully.
311	* @returns rcBusy when encountering a busy critical section in GC/R0.
312	* @returns VERR_SEM_DESTROYED if the critical section is dead.
313	*
314	* @param pCritSect The PDM critical section to enter.
315	* @param rcBusy The status code to return when we're in GC or R0
316	* and the section is busy. Pass VINF_SUCCESS to
317	* acquired the critical section thru a ring-3
318	* call if necessary.
319	*/
320	VMMDECL(int) PDMCritSectEnter(PPDMCRITSECT pCritSect, int rcBusy)
321	{
322	int rc;
323	#ifndef IN_RING3
324	if (rcBusy == VINF_SUCCESS)
325	{
326	# ifndef PDMCRITSECT_STRICT
327	rc = pdmCritSectEnter(pCritSect, VERR_SEM_BUSY, NULL);
328	# else
329	RTLOCKVALSRCPOS SrcPos = RTLOCKVALSRCPOS_INIT_NORMAL_API();
330	rc = pdmCritSectEnter(pCritSect, VERR_SEM_BUSY, &SrcPos);
331	# endif
332	}
333	else
334	#endif /* !IN_RING3 */
335	{
336	#ifndef PDMCRITSECT_STRICT
337	rc = pdmCritSectEnter(pCritSect, rcBusy, NULL);
338	#else
339	RTLOCKVALSRCPOS SrcPos = RTLOCKVALSRCPOS_INIT_NORMAL_API();
340	rc = pdmCritSectEnter(pCritSect, rcBusy, &SrcPos);
341	#endif
342	}
343	return rc;
344	}
345
346
347	/**
348	* Enters a PDM critical section, with location information for debugging.
349	*
350	* @returns VINF_SUCCESS if entered successfully.
351	* @returns rcBusy when encountering a busy critical section in GC/R0.
352	* @returns VERR_SEM_DESTROYED if the critical section is dead.
353	*
354	* @param pCritSect The PDM critical section to enter.
355	* @param rcBusy The status code to return when we're in GC or R0
356	* and the section is busy. Pass VINF_SUCCESS to
357	* acquired the critical section thru a ring-3
358	* call if necessary.
359	* @param uId Some kind of locking location ID. Typically a
360	* return address up the stack. Optional (0).
361	* @param pszFile The file where the lock is being acquired from.
362	* Optional.
363	* @param iLine The line number in that file. Optional (0).
364	* @param pszFunction The function where the lock is being acquired
365	* from. Optional.
366	*/
367	VMMDECL(int) PDMCritSectEnterDebug(PPDMCRITSECT pCritSect, int rcBusy, RTHCUINTPTR uId, RT_SRC_POS_DECL)
368	{
369	#ifdef PDMCRITSECT_STRICT
370	RTLOCKVALSRCPOS SrcPos = RTLOCKVALSRCPOS_INIT_DEBUG_API();
371	return pdmCritSectEnter(pCritSect, rcBusy, &SrcPos);
372	#else
373	return pdmCritSectEnter(pCritSect, rcBusy, NULL);
374	#endif
375	}
376
377
378	/**
379	* Common worker for the debug and normal APIs.
380	*
381	* @retval VINF_SUCCESS on success.
382	* @retval VERR_SEM_BUSY if the critsect was owned.
383	* @retval VERR_SEM_NESTED if nested enter on a no nesting section. (Asserted.)
384	* @retval VERR_SEM_DESTROYED if RTCritSectDelete was called while waiting.
385	*
386	* @param pCritSect The critical section.
387	*/
388	static int pdmCritSectTryEnter(PPDMCRITSECT pCritSect, PCRTLOCKVALSRCPOS pSrcPos)
389	{
390	/*
391	* If the critical section has already been destroyed, then inform the caller.
392	*/
393	AssertMsgReturn(pCritSect->s.Core.u32Magic == RTCRITSECT_MAGIC,
394	("%p %RX32\n", pCritSect, pCritSect->s.Core.u32Magic),
395	VERR_SEM_DESTROYED);
396
397	/*
398	* See if we're lucky.
399	*/
400	/* NOP ... */
401	if (pCritSect->s.Core.fFlags & RTCRITSECT_FLAGS_NOP)
402	return VINF_SUCCESS;
403
404	RTNATIVETHREAD hNativeSelf = pdmCritSectGetNativeSelf(pCritSect);
405	/* ... not owned ... */
406	if (ASMAtomicCmpXchgS32(&pCritSect->s.Core.cLockers, 0, -1))
407	return pdmCritSectEnterFirst(pCritSect, hNativeSelf, pSrcPos);
408
409	/* ... or nested. */
410	if (pCritSect->s.Core.NativeThreadOwner == hNativeSelf)
411	{
412	ASMAtomicIncS32(&pCritSect->s.Core.cLockers);
413	ASMAtomicIncS32(&pCritSect->s.Core.cNestings);
414	Assert(pCritSect->s.Core.cNestings > 1);
415	return VINF_SUCCESS;
416	}
417
418	/* no spinning */
419
420	/*
421	* Return busy.
422	*/
423	#ifdef IN_RING3
424	STAM_REL_COUNTER_INC(&pCritSect->s.StatContentionR3);
425	#else
426	STAM_REL_COUNTER_INC(&pCritSect->s.StatContentionRZLock);
427	#endif
428	LogFlow(("PDMCritSectTryEnter: locked\n"));
429	return VERR_SEM_BUSY;
430	}
431
432
433	/**
434	* Try enter a critical section.
435	*
436	* @retval VINF_SUCCESS on success.
437	* @retval VERR_SEM_BUSY if the critsect was owned.
438	* @retval VERR_SEM_NESTED if nested enter on a no nesting section. (Asserted.)
439	* @retval VERR_SEM_DESTROYED if RTCritSectDelete was called while waiting.
440	*
441	* @param pCritSect The critical section.
442	*/
443	VMMDECL(int) PDMCritSectTryEnter(PPDMCRITSECT pCritSect)
444	{
445	#ifndef PDMCRITSECT_STRICT
446	return pdmCritSectTryEnter(pCritSect, NULL);
447	#else
448	RTLOCKVALSRCPOS SrcPos = RTLOCKVALSRCPOS_INIT_NORMAL_API();
449	return pdmCritSectTryEnter(pCritSect, &SrcPos);
450	#endif
451	}
452
453
454	/**
455	* Try enter a critical section, with location information for debugging.
456	*
457	* @retval VINF_SUCCESS on success.
458	* @retval VERR_SEM_BUSY if the critsect was owned.
459	* @retval VERR_SEM_NESTED if nested enter on a no nesting section. (Asserted.)
460	* @retval VERR_SEM_DESTROYED if RTCritSectDelete was called while waiting.
461	*
462	* @param pCritSect The critical section.
463	* @param uId Some kind of locking location ID. Typically a
464	* return address up the stack. Optional (0).
465	* @param pszFile The file where the lock is being acquired from.
466	* Optional.
467	* @param iLine The line number in that file. Optional (0).
468	* @param pszFunction The function where the lock is being acquired
469	* from. Optional.
470	*/
471	VMMDECL(int) PDMCritSectTryEnterDebug(PPDMCRITSECT pCritSect, RTHCUINTPTR uId, RT_SRC_POS_DECL)
472	{
473	#ifdef PDMCRITSECT_STRICT
474	RTLOCKVALSRCPOS SrcPos = RTLOCKVALSRCPOS_INIT_DEBUG_API();
475	return pdmCritSectTryEnter(pCritSect, &SrcPos);
476	#else
477	return pdmCritSectTryEnter(pCritSect, NULL);
478	#endif
479	}
480
481
482	#ifdef IN_RING3
483	/**
484	* Enters a PDM critical section.
485	*
486	* @returns VINF_SUCCESS if entered successfully.
487	* @returns rcBusy when encountering a busy critical section in GC/R0.
488	* @returns VERR_SEM_DESTROYED if the critical section is dead.
489	*
490	* @param pCritSect The PDM critical section to enter.
491	* @param fCallRing3 Whether this is a VMMRZCallRing3()request.
492	*/
493	VMMR3DECL(int) PDMR3CritSectEnterEx(PPDMCRITSECT pCritSect, bool fCallRing3)
494	{
495	int rc = PDMCritSectEnter(pCritSect, VERR_INTERNAL_ERROR);
496	if ( rc == VINF_SUCCESS
497	&& fCallRing3
498	&& pCritSect->s.Core.pValidatorRec
499	&& pCritSect->s.Core.pValidatorRec->hThread != NIL_RTTHREAD)
500	RTLockValidatorRecExclReleaseOwnerUnchecked(pCritSect->s.Core.pValidatorRec);
501	return rc;
502	}
503	#endif /* IN_RING3 */
504
505
506	/**
507	* Leaves a critical section entered with PDMCritSectEnter().
508	*
509	* @param pCritSect The PDM critical section to leave.
510	*/
511	VMMDECL(void) PDMCritSectLeave(PPDMCRITSECT pCritSect)
512	{
513	AssertMsg(pCritSect->s.Core.u32Magic == RTCRITSECT_MAGIC, ("%p %RX32\n", pCritSect, pCritSect->s.Core.u32Magic));
514	Assert(pCritSect->s.Core.u32Magic == RTCRITSECT_MAGIC);
515
516	/* Check for NOP sections before asserting ownership. */
517	if (pCritSect->s.Core.fFlags & RTCRITSECT_FLAGS_NOP)
518	return;
519
520	Assert(pCritSect->s.Core.NativeThreadOwner == pdmCritSectGetNativeSelf(pCritSect));
521	Assert(pCritSect->s.Core.cNestings >= 1);
522
523	/*
524	* Nested leave.
525	*/
526	if (pCritSect->s.Core.cNestings > 1)
527	{
528	ASMAtomicDecS32(&pCritSect->s.Core.cNestings);
529	Assert(pCritSect->s.Core.cNestings >= 1);
530	ASMAtomicDecS32(&pCritSect->s.Core.cLockers);
531	Assert(pCritSect->s.Core.cLockers >= 0);
532	return;
533	}
534
535	#ifdef IN_RING0
536	# if 0 /** @todo Make SUPSemEventSignal interrupt safe (handle table++) and enable this for: defined(RT_OS_LINUX) \|\| defined(RT_OS_OS2) */
537	if (1) /* SUPSemEventSignal is safe */
538	# else
539	if (ASMIntAreEnabled())
540	# endif
541	#endif
542	#if defined(IN_RING3) \|\| defined(IN_RING0)
543	{
544	/*
545	* Leave for real.
546	*/
547	/* update members. */
548	# ifdef IN_RING3
549	RTSEMEVENT hEventToSignal = pCritSect->s.EventToSignal;
550	pCritSect->s.EventToSignal = NIL_RTSEMEVENT;
551	# if defined(PDMCRITSECT_STRICT)
552	if (pCritSect->s.Core.pValidatorRec->hThread != NIL_RTTHREAD)
553	RTLockValidatorRecExclReleaseOwnerUnchecked(pCritSect->s.Core.pValidatorRec);
554	# endif
555	Assert(!pCritSect->s.Core.pValidatorRec \|\| pCritSect->s.Core.pValidatorRec->hThread == NIL_RTTHREAD);
556	# endif
557	ASMAtomicAndU32(&pCritSect->s.Core.fFlags, ~PDMCRITSECT_FLAGS_PENDING_UNLOCK);
558	ASMAtomicWriteHandle(&pCritSect->s.Core.NativeThreadOwner, NIL_RTNATIVETHREAD);
559	ASMAtomicDecS32(&pCritSect->s.Core.cNestings);
560	Assert(pCritSect->s.Core.cNestings == 0);
561
562	/* stop and decrement lockers. */
563	STAM_PROFILE_ADV_STOP(&pCritSect->s.StatLocked, l);
564	ASMCompilerBarrier();
565	if (ASMAtomicDecS32(&pCritSect->s.Core.cLockers) >= 0)
566	{
567	/* Someone is waiting, wake up one of them. */
568	SUPSEMEVENT hEvent = (SUPSEMEVENT)pCritSect->s.Core.EventSem;
569	PSUPDRVSESSION pSession = pCritSect->s.CTX_SUFF(pVM)->pSession;
570	int rc = SUPSemEventSignal(pSession, hEvent);
571	AssertRC(rc);
572	}
573
574	# ifdef IN_RING3
575	/* Signal exit event. */
576	if (hEventToSignal != NIL_RTSEMEVENT)
577	{
578	LogBird(("Signalling %#x\n", hEventToSignal));
579	int rc = RTSemEventSignal(hEventToSignal);
580	AssertRC(rc);
581	}
582	# endif
583
584	# if defined(DEBUG_bird) && defined(IN_RING0)
585	VMMTrashVolatileXMMRegs();
586	# endif
587	}
588	#endif /* IN_RING3 \|\| IN_RING0 */
589	#ifdef IN_RING0
590	else
591	#endif
592	#if defined(IN_RING0) \|\| defined(IN_RC)
593	{
594	/*
595	* Try leave it.
596	*/
597	if (pCritSect->s.Core.cLockers == 0)
598	{
599	ASMAtomicWriteS32(&pCritSect->s.Core.cNestings, 0);
600	RTNATIVETHREAD hNativeThread = pCritSect->s.Core.NativeThreadOwner;
601	ASMAtomicAndU32(&pCritSect->s.Core.fFlags, ~PDMCRITSECT_FLAGS_PENDING_UNLOCK);
602	STAM_PROFILE_ADV_STOP(&pCritSect->s.StatLocked, l);
603
604	ASMAtomicWriteHandle(&pCritSect->s.Core.NativeThreadOwner, NIL_RTNATIVETHREAD);
605	if (ASMAtomicCmpXchgS32(&pCritSect->s.Core.cLockers, -1, 0))
606	return;
607
608	/* darn, someone raced in on us. */
609	ASMAtomicWriteHandle(&pCritSect->s.Core.NativeThreadOwner, hNativeThread);
610	STAM_PROFILE_ADV_START(&pCritSect->s.StatLocked, l);
611	Assert(pCritSect->s.Core.cNestings == 0);
612	ASMAtomicWriteS32(&pCritSect->s.Core.cNestings, 1);
613	}
614	ASMAtomicOrU32(&pCritSect->s.Core.fFlags, PDMCRITSECT_FLAGS_PENDING_UNLOCK);
615
616	/*
617	* Queue the request.
618	*/
619	PVM pVM = pCritSect->s.CTX_SUFF(pVM); AssertPtr(pVM);
620	PVMCPU pVCpu = VMMGetCpu(pVM); AssertPtr(pVCpu);
621	uint32_t i = pVCpu->pdm.s.cQueuedCritSectLeaves++;
622	LogFlow(("PDMCritSectLeave: [%d]=%p => R3\n", i, pCritSect));
623	AssertFatal(i < RT_ELEMENTS(pVCpu->pdm.s.apQueuedCritSectsLeaves));
624	pVCpu->pdm.s.apQueuedCritSectsLeaves[i] = MMHyperCCToR3(pVM, pCritSect);
625	VMCPU_FF_SET(pVCpu, VMCPU_FF_PDM_CRITSECT);
626	VMCPU_FF_SET(pVCpu, VMCPU_FF_TO_R3);
627	STAM_REL_COUNTER_INC(&pVM->pdm.s.StatQueuedCritSectLeaves);
628	STAM_REL_COUNTER_INC(&pCritSect->s.StatContentionRZUnlock);
629	}
630	#endif /* IN_RING0 \|\| IN_RC */
631	}
632
633
634	#if defined(IN_RING3) \|\| defined(IN_RING0)
635	/**
636	* Process the critical sections queued for ring-3 'leave'.
637	*
638	* @param pVCpu The VMCPU handle.
639	*/
640	VMMDECL(void) PDMCritSectFF(PVMCPU pVCpu)
641	{
642	Assert(pVCpu->pdm.s.cQueuedCritSectLeaves > 0);
643
644	const RTUINT c = pVCpu->pdm.s.cQueuedCritSectLeaves;
645	for (RTUINT i = 0; i < c; i++)
646	{
647	# ifdef IN_RING3
648	PPDMCRITSECT pCritSect = pVCpu->pdm.s.apQueuedCritSectsLeaves[i];
649	# else
650	PPDMCRITSECT pCritSect = (PPDMCRITSECT)MMHyperR3ToCC(pVCpu->CTX_SUFF(pVM), pVCpu->pdm.s.apQueuedCritSectsLeaves[i]);
651	# endif
652
653	PDMCritSectLeave(pCritSect);
654	LogFlow(("PDMR3CritSectFF: %p\n", pCritSect));
655	}
656
657	pVCpu->pdm.s.cQueuedCritSectLeaves = 0;
658	VMCPU_FF_CLEAR(pVCpu, VMCPU_FF_PDM_CRITSECT);
659	}
660	#endif /* IN_RING3 \|\| IN_RING0 */
661
662
663	/**
664	* Checks the caller is the owner of the critical section.
665	*
666	* @returns true if owner.
667	* @returns false if not owner.
668	* @param pCritSect The critical section.
669	*/
670	VMMDECL(bool) PDMCritSectIsOwner(PCPDMCRITSECT pCritSect)
671	{
672	#ifdef IN_RING3
673	return RTCritSectIsOwner(&pCritSect->s.Core);
674	#else
675	PVM pVM = pCritSect->s.CTX_SUFF(pVM); AssertPtr(pVM);
676	PVMCPU pVCpu = VMMGetCpu(pVM); AssertPtr(pVCpu);
677	if (pCritSect->s.Core.NativeThreadOwner != pVCpu->hNativeThread)
678	return false;
679	return (pCritSect->s.Core.fFlags & PDMCRITSECT_FLAGS_PENDING_UNLOCK) == 0
680	\|\| pCritSect->s.Core.cNestings > 1;
681	#endif
682	}
683
684
685	/**
686	* Checks the specified VCPU is the owner of the critical section.
687	*
688	* @returns true if owner.
689	* @returns false if not owner.
690	* @param pCritSect The critical section.
691	* @param pVCpu The virtual CPU handle.
692	*/
693	VMMDECL(bool) PDMCritSectIsOwnerEx(PCPDMCRITSECT pCritSect, PVMCPU pVCpu)
694	{
695	#ifdef IN_RING3
696	NOREF(pVCpu);
697	return RTCritSectIsOwner(&pCritSect->s.Core);
698	#else
699	Assert(&pVCpu->CTX_SUFF(pVM)->aCpus[pVCpu->idCpu] == pVCpu);
700	if (pCritSect->s.Core.NativeThreadOwner != pVCpu->hNativeThread)
701	return false;
702	return (pCritSect->s.Core.fFlags & PDMCRITSECT_FLAGS_PENDING_UNLOCK) == 0
703	\|\| pCritSect->s.Core.cNestings > 1;
704	#endif
705	}
706
707
708	/**
709	* Checks if anyone is waiting on the critical section we own.
710	*
711	* @returns true if someone is waiting.
712	* @returns false if no one is waiting.
713	* @param pCritSect The critical section.
714	*/
715	VMMDECL(bool) PDMCritSectHasWaiters(PCPDMCRITSECT pCritSect)
716	{
717	AssertReturn(pCritSect->s.Core.u32Magic == RTCRITSECT_MAGIC, false);
718	Assert(pCritSect->s.Core.NativeThreadOwner == pdmCritSectGetNativeSelf(pCritSect));
719	return pCritSect->s.Core.cLockers >= pCritSect->s.Core.cNestings;
720	}
721
722
723	/**
724	* Checks if a critical section is initialized or not.
725	*
726	* @returns true if initialized.
727	* @returns false if not initialized.
728	* @param pCritSect The critical section.
729	*/
730	VMMDECL(bool) PDMCritSectIsInitialized(PCPDMCRITSECT pCritSect)
731	{
732	return RTCritSectIsInitialized(&pCritSect->s.Core);
733	}
734
735
736	/**
737	* Gets the recursion depth.
738	*
739	* @returns The recursion depth.
740	* @param pCritSect The critical section.
741	*/
742	VMMDECL(uint32_t) PDMCritSectGetRecursion(PCPDMCRITSECT pCritSect)
743	{
744	return RTCritSectGetRecursion(&pCritSect->s.Core);
745	}

Note: See TracBrowser for help on using the repository browser.

source: vbox/trunk/src/VBox/VMM/VMMAll/PDMAllCritSect.cpp@ 37583

Download in other formats: