semevent-r0drv-darwin.cpp@ 63509

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1	/* $Id: semevent-r0drv-darwin.cpp 63509 2016-08-15 22:54:50Z vboxsync $ */
2	/** @file
3	* IPRT - Single Release Event Semaphores, Ring-0 Driver, Darwin.
4	*/
5
6	/*
7	* Copyright (C) 2006-2016 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	* The contents of this file may alternatively be used under the terms
18	* of the Common Development and Distribution License Version 1.0
19	* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20	* VirtualBox OSE distribution, in which case the provisions of the
21	* CDDL are applicable instead of those of the GPL.
22	*
23	* You may elect to license modified versions of this file under the
24	* terms and conditions of either the GPL or the CDDL or both.
25	*/
26
27
28	/*********************************************************************************************************************************
29	* Header Files *
30	*********************************************************************************************************************************/
31	#define RTSEMEVENT_WITHOUT_REMAPPING
32	#include "the-darwin-kernel.h"
33	#include "internal/iprt.h"
34	#include <iprt/semaphore.h>
35
36	#include <iprt/assert.h>
37	#include <iprt/asm.h>
38	#if defined(RT_ARCH_AMD64) \|\| defined(RT_ARCH_X86)
39	# include <iprt/asm-amd64-x86.h>
40	#endif
41	#include <iprt/err.h>
42	#include <iprt/list.h>
43	#include <iprt/lockvalidator.h>
44	#include <iprt/mem.h>
45	#include <iprt/mp.h>
46	#include <iprt/thread.h>
47	#include <iprt/time.h>
48
49	#include "internal/magics.h"
50
51
52	/*********************************************************************************************************************************
53	* Structures and Typedefs *
54	*********************************************************************************************************************************/
55	/**
56	* Waiter entry. Lives on the stack.
57	*/
58	typedef struct RTSEMEVENTDARWINENTRY
59	{
60	/** The list node. */
61	RTLISTNODE Node;
62	/** Flag set when waking up the thread by signal or destroy. */
63	bool volatile fWokenUp;
64	} RTSEMEVENTDARWINENTRY;
65	/** Pointer to waiter entry. */
66	typedef RTSEMEVENTDARWINENTRY *PRTSEMEVENTDARWINENTRY;
67
68
69	/**
70	* Darwin event semaphore.
71	*/
72	typedef struct RTSEMEVENTINTERNAL
73	{
74	/** Magic value (RTSEMEVENT_MAGIC). */
75	uint32_t volatile u32Magic;
76	/** Reference counter. */
77	uint32_t volatile cRefs;
78	/** Set if there are blocked threads. */
79	bool volatile fHaveBlockedThreads;
80	/** Set if the event object is signaled. */
81	bool volatile fSignaled;
82	/** List of waiting and woken up threads. */
83	RTLISTANCHOR WaitList;
84	/** The spinlock protecting us. */
85	lck_spin_t *pSpinlock;
86	} RTSEMEVENTINTERNAL, *PRTSEMEVENTINTERNAL;
87
88
89
90	RTDECL(int) RTSemEventCreate(PRTSEMEVENT phEventSem)
91	{
92	return RTSemEventCreateEx(phEventSem, 0 /fFlags/, NIL_RTLOCKVALCLASS, NULL);
93	}
94
95
96	RTDECL(int) RTSemEventCreateEx(PRTSEMEVENT phEventSem, uint32_t fFlags, RTLOCKVALCLASS hClass, const char *pszNameFmt, ...)
97	{
98	RT_NOREF(hClass, pszNameFmt);
99	AssertCompile(sizeof(RTSEMEVENTINTERNAL) > sizeof(void *));
100	AssertReturn(!(fFlags & ~(RTSEMEVENT_FLAGS_NO_LOCK_VAL \| RTSEMEVENT_FLAGS_BOOTSTRAP_HACK)), VERR_INVALID_PARAMETER);
101	Assert(!(fFlags & RTSEMEVENT_FLAGS_BOOTSTRAP_HACK) \|\| (fFlags & RTSEMEVENT_FLAGS_NO_LOCK_VAL));
102	AssertPtrReturn(phEventSem, VERR_INVALID_POINTER);
103	RT_ASSERT_PREEMPTIBLE();
104	IPRT_DARWIN_SAVE_EFL_AC();
105
106	PRTSEMEVENTINTERNAL pThis = (PRTSEMEVENTINTERNAL)RTMemAlloc(sizeof(*pThis));
107	if (pThis)
108	{
109	pThis->u32Magic = RTSEMEVENT_MAGIC;
110	pThis->cRefs = 1;
111	pThis->fHaveBlockedThreads = false;
112	pThis->fSignaled = false;
113	RTListInit(&pThis->WaitList);
114	Assert(g_pDarwinLockGroup);
115	pThis->pSpinlock = lck_spin_alloc_init(g_pDarwinLockGroup, LCK_ATTR_NULL);
116	if (pThis->pSpinlock)
117	{
118	*phEventSem = pThis;
119	IPRT_DARWIN_RESTORE_EFL_AC();
120	return VINF_SUCCESS;
121	}
122
123	pThis->u32Magic = 0;
124	RTMemFree(pThis);
125	}
126	IPRT_DARWIN_RESTORE_EFL_AC();
127	return VERR_NO_MEMORY;
128	}
129
130
131	/**
132	* Retain a reference to the semaphore.
133	*
134	* @param pThis The semaphore.
135	*/
136	DECLINLINE(void) rtR0SemEventDarwinRetain(PRTSEMEVENTINTERNAL pThis)
137	{
138	uint32_t cRefs = ASMAtomicIncU32(&pThis->cRefs);
139	Assert(cRefs && cRefs < 100000);
140	}
141
142
143	/**
144	* Release a reference, destroy the thing if necessary.
145	*
146	* @param pThis The semaphore.
147	*/
148	DECLINLINE(void) rtR0SemEventDarwinRelease(PRTSEMEVENTINTERNAL pThis)
149	{
150	if (RT_UNLIKELY(ASMAtomicDecU32(&pThis->cRefs) == 0))
151	{
152	Assert(pThis->u32Magic != RTSEMEVENT_MAGIC);
153	IPRT_DARWIN_SAVE_EFL_AC();
154
155	lck_spin_destroy(pThis->pSpinlock, g_pDarwinLockGroup);
156	RTMemFree(pThis);
157
158	IPRT_DARWIN_RESTORE_EFL_AC();
159	}
160	}
161
162	RTDECL(int) RTSemEventDestroy(RTSEMEVENT hEventSem)
163	{
164	PRTSEMEVENTINTERNAL pThis = hEventSem;
165	if (pThis == NIL_RTSEMEVENT)
166	return VINF_SUCCESS;
167	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
168	AssertMsgReturn(pThis->u32Magic == RTSEMEVENT_MAGIC, ("pThis=%p u32Magic=%#x\n", pThis, pThis->u32Magic), VERR_INVALID_HANDLE);
169	RT_ASSERT_INTS_ON();
170	IPRT_DARWIN_SAVE_EFL_AC();
171
172	lck_spin_lock(pThis->pSpinlock);
173
174	ASMAtomicWriteU32(&pThis->u32Magic, ~RTSEMEVENT_MAGIC); /* make the handle invalid */
175	ASMAtomicWriteBool(&pThis->fSignaled, false);
176
177	/* abort waiting threads. */
178	PRTSEMEVENTDARWINENTRY pWaiter;
179	RTListForEach(&pThis->WaitList, pWaiter, RTSEMEVENTDARWINENTRY, Node)
180	{
181	pWaiter->fWokenUp = true;
182	thread_wakeup_prim((event_t)pWaiter, FALSE /* all threads */, THREAD_RESTART);
183	}
184
185	lck_spin_unlock(pThis->pSpinlock);
186	rtR0SemEventDarwinRelease(pThis);
187
188	IPRT_DARWIN_RESTORE_EFL_AC();
189	return VINF_SUCCESS;
190	}
191
192
193	RTDECL(int) RTSemEventSignal(RTSEMEVENT hEventSem)
194	{
195	PRTSEMEVENTINTERNAL pThis = (PRTSEMEVENTINTERNAL)hEventSem;
196	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
197	AssertMsgReturn(pThis->u32Magic == RTSEMEVENT_MAGIC,
198	("pThis=%p u32Magic=%#x\n", pThis, pThis->u32Magic),
199	VERR_INVALID_HANDLE);
200	RT_ASSERT_PREEMPT_CPUID_VAR();
201	RT_ASSERT_INTS_ON();
202	IPRT_DARWIN_SAVE_EFL_AC();
203
204	rtR0SemEventDarwinRetain(pThis);
205
206	/** @todo should probably disable interrupts here... update
207	* semspinmutex-r0drv-generic.c when done. */
208	lck_spin_lock(pThis->pSpinlock);
209
210	/*
211	* Wake up one thread.
212	*/
213	ASMAtomicWriteBool(&pThis->fSignaled, true);
214
215	PRTSEMEVENTDARWINENTRY pWaiter;
216	RTListForEach(&pThis->WaitList, pWaiter, RTSEMEVENTDARWINENTRY, Node)
217	{
218	if (!pWaiter->fWokenUp)
219	{
220	pWaiter->fWokenUp = true;
221	thread_wakeup_prim((event_t)pWaiter, FALSE /* all threads */, THREAD_AWAKENED);
222	ASMAtomicWriteBool(&pThis->fSignaled, false);
223	break;
224	}
225	}
226
227	lck_spin_unlock(pThis->pSpinlock);
228	rtR0SemEventDarwinRelease(pThis);
229
230	RT_ASSERT_PREEMPT_CPUID();
231	IPRT_DARWIN_RESTORE_EFL_AC();
232	return VINF_SUCCESS;
233	}
234
235
236	/**
237	* Worker for RTSemEventWaitEx and RTSemEventWaitExDebug.
238	*
239	* @returns VBox status code.
240	* @param pThis The event semaphore.
241	* @param fFlags See RTSemEventWaitEx.
242	* @param uTimeout See RTSemEventWaitEx.
243	* @param pSrcPos The source code position of the wait.
244	*/
245	static int rtR0SemEventDarwinWait(PRTSEMEVENTINTERNAL pThis, uint32_t fFlags, uint64_t uTimeout,
246	PCRTLOCKVALSRCPOS pSrcPos)
247	{
248	RT_NOREF(pSrcPos);
249
250	/*
251	* Validate the input.
252	*/
253	AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
254	AssertMsgReturn(pThis->u32Magic == RTSEMEVENT_MAGIC, ("%p u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_PARAMETER);
255	AssertReturn(RTSEMWAIT_FLAGS_ARE_VALID(fFlags), VERR_INVALID_PARAMETER);
256	IPRT_DARWIN_SAVE_EFL_AC();
257
258	rtR0SemEventDarwinRetain(pThis);
259	lck_spin_lock(pThis->pSpinlock);
260
261	/*
262	* In the signaled state?
263	*/
264	int rc;
265	if (ASMAtomicCmpXchgBool(&pThis->fSignaled, false, true))
266	rc = VINF_SUCCESS;
267	else
268	{
269	/*
270	* We have to wait. So, we'll need to convert the timeout and figure
271	* out if it's indefinite or not.
272	*/
273	uint64_t uNsAbsTimeout = 1;
274	if (!(fFlags & RTSEMWAIT_FLAGS_INDEFINITE))
275	{
276	if (fFlags & RTSEMWAIT_FLAGS_MILLISECS)
277	uTimeout = uTimeout < UINT64_MAX / UINT32_C(1000000) * UINT32_C(1000000)
278	? uTimeout * UINT32_C(1000000)
279	: UINT64_MAX;
280	if (uTimeout == UINT64_MAX)
281	fFlags \|= RTSEMWAIT_FLAGS_INDEFINITE;
282	else
283	{
284	uint64_t u64Now;
285	if (fFlags & RTSEMWAIT_FLAGS_RELATIVE)
286	{
287	if (uTimeout != 0)
288	{
289	u64Now = RTTimeSystemNanoTS();
290	uNsAbsTimeout = u64Now + uTimeout;
291	if (uNsAbsTimeout < u64Now) /* overflow */
292	fFlags \|= RTSEMWAIT_FLAGS_INDEFINITE;
293	}
294	}
295	else
296	{
297	uNsAbsTimeout = uTimeout;
298	u64Now = RTTimeSystemNanoTS();
299	uTimeout = u64Now < uTimeout ? uTimeout - u64Now : 0;
300	}
301	}
302	}
303
304	if ( !(fFlags & RTSEMWAIT_FLAGS_INDEFINITE)
305	&& uTimeout == 0)
306	{
307	/*
308	* Poll call, we already checked the condition above so no need to
309	* wait for anything.
310	*/
311	rc = VERR_TIMEOUT;
312	}
313	else
314	{
315	RTSEMEVENTDARWINENTRY Waiter;
316	Waiter.fWokenUp = false;
317	RTListAppend(&pThis->WaitList, &Waiter.Node);
318
319	for (;;)
320	{
321	/*
322	* Do the actual waiting.
323	*/
324	ASMAtomicWriteBool(&pThis->fHaveBlockedThreads, true);
325	wait_interrupt_t fInterruptible = fFlags & RTSEMWAIT_FLAGS_INTERRUPTIBLE ? THREAD_ABORTSAFE : THREAD_UNINT;
326	wait_result_t rcWait;
327	if (fFlags & RTSEMWAIT_FLAGS_INDEFINITE)
328	rcWait = lck_spin_sleep(pThis->pSpinlock, LCK_SLEEP_DEFAULT, (event_t)&Waiter, fInterruptible);
329	else
330	{
331	uint64_t u64AbsTime;
332	nanoseconds_to_absolutetime(uNsAbsTimeout, &u64AbsTime);
333	rcWait = lck_spin_sleep_deadline(pThis->pSpinlock, LCK_SLEEP_DEFAULT,
334	(event_t)&Waiter, fInterruptible, u64AbsTime);
335	}
336
337	/*
338	* Deal with the wait result.
339	*/
340	if (RT_LIKELY(pThis->u32Magic == RTSEMEVENT_MAGIC))
341	{
342	switch (rcWait)
343	{
344	case THREAD_AWAKENED:
345	if (RT_LIKELY(Waiter.fWokenUp))
346	rc = VINF_SUCCESS;
347	else if (fFlags & RTSEMWAIT_FLAGS_INTERRUPTIBLE)
348	rc = VERR_INTERRUPTED;
349	else
350	continue; /* Seen this happen after fork/exec/something. */
351	break;
352
353	case THREAD_TIMED_OUT:
354	Assert(!(fFlags & RTSEMWAIT_FLAGS_INDEFINITE));
355	rc = !Waiter.fWokenUp ? VERR_TIMEOUT : VINF_SUCCESS;
356	break;
357
358	case THREAD_INTERRUPTED:
359	Assert(fInterruptible != THREAD_UNINT);
360	rc = !Waiter.fWokenUp ? VERR_INTERRUPTED : VINF_SUCCESS;
361	break;
362
363	case THREAD_RESTART:
364	AssertMsg(pThis->u32Magic == ~RTSEMEVENT_MAGIC, ("%#x\n", pThis->u32Magic));
365	rc = VERR_SEM_DESTROYED;
366	break;
367
368	default:
369	AssertMsgFailed(("rcWait=%d\n", rcWait));
370	rc = VERR_INTERNAL_ERROR_3;
371	break;
372	}
373	}
374	else
375	rc = VERR_SEM_DESTROYED;
376	break;
377	}
378
379	RTListNodeRemove(&Waiter.Node);
380	}
381	}
382
383	lck_spin_unlock(pThis->pSpinlock);
384	rtR0SemEventDarwinRelease(pThis);
385	IPRT_DARWIN_RESTORE_EFL_AC();
386	return rc;
387	}
388
389
390	RTDECL(int) RTSemEventWaitEx(RTSEMEVENT hEventSem, uint32_t fFlags, uint64_t uTimeout)
391	{
392	#ifndef RTSEMEVENT_STRICT
393	return rtR0SemEventDarwinWait(hEventSem, fFlags, uTimeout, NULL);
394	#else
395	RTLOCKVALSRCPOS SrcPos = RTLOCKVALSRCPOS_INIT_NORMAL_API();
396	return rtR0SemEventDarwinWait(hEventSem, fFlags, uTimeout, &SrcPos);
397	#endif
398	}
399
400
401	RTDECL(int) RTSemEventWaitExDebug(RTSEMEVENT hEventSem, uint32_t fFlags, uint64_t uTimeout,
402	RTHCUINTPTR uId, RT_SRC_POS_DECL)
403	{
404	RTLOCKVALSRCPOS SrcPos = RTLOCKVALSRCPOS_INIT_DEBUG_API();
405	return rtR0SemEventDarwinWait(hEventSem, fFlags, uTimeout, &SrcPos);
406	}
407
408
409	RTDECL(uint32_t) RTSemEventGetResolution(void)
410	{
411	uint64_t cNs;
412	absolutetime_to_nanoseconds(1, &cNs);
413	return (uint32_t)cNs ? (uint32_t)cNs : 0;
414	}
415

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source: vbox/trunk/src/VBox/Runtime/r0drv/darwin/semevent-r0drv-darwin.cpp@ 63509

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