timer-win32.cpp@ 729

Last change on this file since 729 was 197, checked in by vboxsync, 18 years ago
A stab at generic timers (untested).
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File size: 14.8 KB

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1	/* $Id: timer-win32.cpp 197 2007-01-20 01:22:45Z vboxsync $ */
2	/** @file
3	* InnoTek Portable Runtime - Timer.
4	*/
5
6	/*
7	* Copyright (C) 2006 InnoTek Systemberatung GmbH
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 as published by the Free Software Foundation,
13	* in version 2 as it comes in the "COPYING" file of the VirtualBox OSE
14	* distribution. VirtualBox OSE is distributed in the hope that it will
15	* be useful, but WITHOUT ANY WARRANTY of any kind.
16	*
17	* If you received this file as part of a commercial VirtualBox
18	* distribution, then only the terms of your commercial VirtualBox
19	* license agreement apply instead of the previous paragraph.
20	*/
21
22
23	/* Which code to use is determined here...
24	*
25	* The default is to use wait on NT timers directly with no APC since this
26	* is supposed to give the shortest kernel code paths.
27	*
28	* The USE_APC variation will do as above except that an APC routine is
29	* handling the callback action.
30	*
31	* The USE_WINMM version will use the NT timer wrappers in WinMM which may
32	* result in some 0.1% better correctness in number of delivered ticks. However,
33	* this codepath have more overhead (it uses APC among other things), and I'm not
34	* quite sure if it's actually any more correct.
35	*
36	* The USE_CATCH_UP will play catch up when the timer lags behind. However this
37	* requires a monotonous time source.
38	*
39	* The default mode which we are using is using relative periods of time and thus
40	* will never suffer from errors in the time source. Neither will it try catch up
41	* missed ticks. This suits our current purposes best I'd say.
42	*/
43	#undef USE_APC
44	#undef USE_WINMM
45	#undef USE_CATCH_UP
46
47
48	/*******************************************************************************
49	* Header Files *
50	*******************************************************************************/
51	#define LOG_GROUP RTLOGGROUP_TIMER
52	#define _WIN32_WINNT 0x0500
53	#include <Windows.h>
54
55	#include <iprt/timer.h>
56	#ifdef USE_CATCH_UP
57	# include <iprt/time.h>
58	#endif
59	#include <iprt/alloc.h>
60	#include <iprt/assert.h>
61	#include <iprt/thread.h>
62	#include <iprt/log.h>
63	#include <iprt/asm.h>
64	#include <iprt/semaphore.h>
65	#include <iprt/err.h>
66
67	#include <errno.h>
68
69	__BEGIN_DECLS
70	/* from sysinternals. */
71	NTSYSAPI LONG NTAPI NtSetTimerResolution(IN ULONG DesiredResolution, IN BOOLEAN SetResolution, OUT PULONG CurrentResolution);
72	NTSYSAPI LONG NTAPI NtQueryTimerResolution(OUT PULONG MinimumResolution, OUT PULONG MaximumResolution, OUT PULONG CurrentResolution);
73	__END_DECLS
74
75
76	/*******************************************************************************
77	* Structures and Typedefs *
78	*******************************************************************************/
79	/**
80	* The internal representation of a timer handle.
81	*/
82	typedef struct RTTIMER
83	{
84	/** Magic.
85	* This is RTTIMER_MAGIC, but changes to something else before the timer
86	* is destroyed to indicate clearly that thread should exit. */
87	volatile uint32_t u32Magic;
88	/** User argument. */
89	void *pvUser;
90	/** Callback. */
91	PFNRTTIMER pfnTimer;
92	/** The interval. */
93	unsigned uMilliesInterval;
94	#ifdef USE_WINMM
95	/** Win32 timer id. */
96	UINT TimerId;
97	#else
98	/** Time handle. */
99	HANDLE hTimer;
100	#ifdef USE_APC
101	/** Handle to wait on. */
102	HANDLE hevWait;
103	#endif
104	/** USE_CATCH_UP: ns time of the next tick.
105	* !USE_CATCH_UP: -uMilliesInterval * 10000 */
106	LARGE_INTEGER llNext;
107	/** The thread handle of the timer thread. */
108	RTTHREAD Thread;
109	/** The error/status of the timer.
110	* Initially -1, set to 0 when the timer have been successfully started, and
111	* to errno on failure in starting the timer. */
112	volatile int iError;
113	#endif
114	} RTTIMER;
115
116	/** Timer handle magic. */
117	#define RTTIMER_MAGIC 0x42424242
118
119
120
121
122	#ifdef USE_WINMM
123	/**
124	* Win32 callback wrapper.
125	*/
126	static void CALLBACK rttimerCallback(UINT uTimerID, UINT uMsg, DWORD_PTR dwUser, DWORD_PTR dw1, DWORD_PTR dw2)
127	{
128	PRTTIMER pTimer = (PRTTIMER)(void *)dwUser;
129	Assert(pTimer->TimerId == uTimerID);
130	pTimer->pfnTimer(pTimer, pTimer->pvUser);
131	NOREF(uMsg); NOREF(dw1); NOREF(dw2); NOREF(uTimerID);
132	}
133	#else /* !USE_WINMM */
134
135	#ifdef USE_APC
136	/**
137	* Async callback.
138	*
139	* @param lpArgToCompletionRoutine Pointer to our timer structure.
140	*/
141	VOID CALLBACK rttimerAPCProc(LPVOID lpArgToCompletionRoutine, DWORD dwTimerLowValue, DWORD dwTimerHighValue)
142	{
143	PRTTIMER pTimer = (PRTTIMER)lpArgToCompletionRoutine;
144
145	/*
146	* Check if we're begin destroyed.
147	*/
148	if (pTimer->u32Magic != RTTIMER_MAGIC)
149	return;
150
151	/*
152	* Callback the handler.
153	*/
154	pTimer->pfnTimer(pTimer, pTimer->pvUser);
155
156	/*
157	* Rearm the timer handler.
158	*/
159	#ifdef USE_CATCH_UP
160	pTimer->llNext.QuadPart += (int64_t)pTimer->uMilliesInterval * 10000;
161	LARGE_INTEGER ll;
162	ll.QuadPart = RTTimeNanoTS() - pTimer->llNext.QuadPart;
163	if (ll.QuadPart < -500000)
164	ll.QuadPart = ll.QuadPart / 100;
165	else
166	ll.QuadPart = -500000 / 100; /* need to catch up, do a minimum wait of 0.5ms. */
167	#else
168	LARGE_INTEGER ll = pTimer->llNext;
169	#endif
170	BOOL frc = SetWaitableTimer(pTimer->hTimer, &ll, 0, rttimerAPCProc, pTimer, FALSE);
171	AssertMsg(frc \|\| pTimer->u32Magic != RTTIMER_MAGIC, ("last error %d\n", GetLastError()));
172	}
173	#endif /* USE_APC */
174
175	/**
176	* Timer thread.
177	*/
178	static DECLCALLBACK(int) rttimerCallback(RTTHREAD Thread, void *pvArg)
179	{
180	PRTTIMER pTimer = (PRTTIMER)(void *)pvArg;
181	Assert(pTimer->u32Magic == RTTIMER_MAGIC);
182
183	/*
184	* Bounce our priority up quite a bit.
185	*/
186	if ( !SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_TIME_CRITICAL)
187	/&& !SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_HIGHEST)/)
188	{
189	int rc = GetLastError();
190	AssertMsgFailed(("Failed to set priority class lasterror %d.\n", rc));
191	pTimer->iError = RTErrConvertFromWin32(rc);
192	return rc;
193	}
194
195	/*
196	* Start the waitable timer.
197	*/
198
199	#ifdef USE_CATCH_UP
200	const int64_t NSInterval = (int64_t)pTimer->uMilliesInterval * 1000000;
201	pTimer->llNext.QuadPart = RTTimeNanoTS() + NSInterval;
202	#else
203	pTimer->llNext.QuadPart = -(int64_t)pTimer->uMilliesInterval * 10000;
204	#endif
205	LARGE_INTEGER ll;
206	ll.QuadPart = -(int64_t)pTimer->uMilliesInterval * 10000;
207	#ifdef USE_APC
208	if (!SetWaitableTimer(pTimer->hTimer, &ll, 0, rttimerAPCProc, pTimer, FALSE))
209	#else
210	if (!SetWaitableTimer(pTimer->hTimer, &ll, 0, NULL, NULL, FALSE))
211	#endif
212	{
213	int rc = GetLastError();
214	AssertMsgFailed(("Failed to set timer, lasterr %d.\n", rc));
215	pTimer->iError = RTErrConvertFromWin32(rc);
216	RTThreadUserSignal(Thread);
217	return rc;
218	}
219
220	/*
221	* Wait for the semaphore to be posted.
222	*/
223	RTThreadUserSignal(Thread);
224	for (;pTimer->u32Magic == RTTIMER_MAGIC;)
225	{
226	#ifdef USE_APC
227	int rc = WaitForSingleObjectEx(pTimer->hevWait, INFINITE, TRUE);
228	if (rc != WAIT_OBJECT_0 && rc != WAIT_IO_COMPLETION)
229	#else
230	int rc = WaitForSingleObjectEx(pTimer->hTimer, INFINITE, FALSE);
231	if (pTimer->u32Magic != RTTIMER_MAGIC)
232	break;
233	if (rc == WAIT_OBJECT_0)
234	{
235	/*
236	* Callback the handler.
237	*/
238	pTimer->pfnTimer(pTimer, pTimer->pvUser);
239
240	/*
241	* Rearm the timer handler.
242	*/
243	#ifdef USE_CATCH_UP
244	pTimer->llNext.QuadPart += NSInterval;
245	LARGE_INTEGER ll;
246	ll.QuadPart = RTTimeNanoTS() - pTimer->llNext.QuadPart;
247	if (ll.QuadPart < -500000)
248	ll.QuadPart = ll.QuadPart / 100;
249	else
250	ll.QuadPart = -500000 / 100; /* need to catch up, do a minimum wait of 0.5ms. */
251	#else
252	LARGE_INTEGER ll = pTimer->llNext;
253	#endif
254	BOOL frc = SetWaitableTimer(pTimer->hTimer, &ll, 0, NULL, NULL, FALSE);
255	AssertMsg(frc \|\| pTimer->u32Magic != RTTIMER_MAGIC, ("last error %d\n", GetLastError()));
256	}
257	else
258	#endif
259	{
260	/*
261	* We failed during wait, so just signal the destructor and exit.
262	*/
263	int rc2 = GetLastError();
264	RTThreadUserSignal(Thread);
265	AssertMsgFailed(("Wait on hTimer failed, rc=%d lasterr=%d\n", rc, rc2));
266	return -1;
267	}
268	}
269
270	/*
271	* Exit.
272	*/
273	RTThreadUserSignal(Thread);
274	return 0;
275	}
276	#endif /* !USE_WINMM */
277
278
279	/**
280	* Create a recurring timer.
281	*
282	* @returns iprt status code.
283	* @param ppTimer Where to store the timer handle.
284	* @param uMilliesInterval Milliseconds between the timer ticks.
285	* This is rounded up to the system granularity.
286	* @param pfnTimer Callback function which shall be scheduled for execution
287	* on every timer tick.
288	* @param pvUser User argument for the callback.
289	*/
290	RTR3DECL(int) RTTimerCreate(PRTTIMER ppTimer, unsigned uMilliesInterval, PFNRTTIMER pfnTimer, void pvUser)
291	{
292	#ifndef USE_WINMM
293	/*
294	* On windows we'll have to set the timer resolution before
295	* we start the timer.
296	*/
297	ULONG Min = ~0;
298	ULONG Max = ~0;
299	ULONG Cur = ~0;
300	NtQueryTimerResolution(&Min, &Max, &Cur);
301	Log(("NtQueryTimerResolution -> Min=%lu Max=%lu Cur=%lu (100ns)\n", Min, Max, Cur));
302	if (Cur > Max && Cur > 10000 /* = 1ms */)
303	{
304	if (NtSetTimerResolution(10000, TRUE, &Cur) >= 0)
305	Log(("Changed timer resolution to 1ms.\n"));
306	else if (NtSetTimerResolution(20000, TRUE, &Cur) >= 0)
307	Log(("Changed timer resolution to 2ms.\n"));
308	else if (NtSetTimerResolution(40000, TRUE, &Cur) >= 0)
309	Log(("Changed timer resolution to 4ms.\n"));
310	else if (Max <= 50000 && NtSetTimerResolution(Max, TRUE, &Cur) >= 0)
311	Log(("Changed timer resolution to %lu *100ns.\n", Max));
312	else
313	{
314	AssertMsgFailed(("Failed to configure timer resolution!\n"));
315	return VERR_INTERNAL_ERROR;
316	}
317	}
318	#endif /* !USE_WINN */
319
320	/*
321	* Create new timer.
322	*/
323	int rc;
324	PRTTIMER pTimer = (PRTTIMER)RTMemAlloc(sizeof(*pTimer));
325	if (pTimer)
326	{
327	pTimer->u32Magic = RTTIMER_MAGIC;
328	pTimer->pvUser = pvUser;
329	pTimer->pfnTimer = pfnTimer;
330	pTimer->uMilliesInterval = uMilliesInterval;
331	#ifdef USE_WINMM
332	/* sync kill doesn't work. */
333	pTimer->TimerId = timeSetEvent(uMilliesInterval, 0, rttimerCallback, (DWORD_PTR)pTimer, TIME_PERIODIC \| TIME_CALLBACK_FUNCTION);
334	if (pTimer->TimerId)
335	{
336	ULONG Min = ~0;
337	ULONG Max = ~0;
338	ULONG Cur = ~0;
339	NtQueryTimerResolution(&Min, &Max, &Cur);
340	Log(("NtQueryTimerResolution -> Min=%lu Max=%lu Cur=%lu (100ns)\n", Min, Max, Cur));
341
342	*ppTimer = pTimer;
343	return VINF_SUCCESS;
344	}
345	rc = VERR_INVALID_PARAMETER;
346
347	#else /* !USE_WINMM */
348
349	/*
350	* Create Win32 event semaphore.
351	*/
352	pTimer->iError = 0;
353	pTimer->hTimer = CreateWaitableTimer(NULL, TRUE, NULL);
354	if (pTimer->hTimer)
355	{
356	#ifdef USE_APC
357	/*
358	* Create wait semaphore.
359	*/
360	pTimer->hevWait = CreateEvent(NULL, FALSE, FALSE, NULL);
361	if (pTimer->hevWait)
362	#endif
363	{
364	/*
365	* Kick off the timer thread.
366	*/
367	rc = RTThreadCreate(&pTimer->Thread, rttimerCallback, pTimer, 0, RTTHREADTYPE_TIMER, RTTHREADFLAGS_WAITABLE, "Timer");
368	if (RT_SUCCESS(rc))
369	{
370	/*
371	* Wait for the timer to successfully create the timer
372	* If we don't get a response in 10 secs, then we assume we're screwed.
373	*/
374	rc = RTThreadUserWait(pTimer->Thread, 10000);
375	if (RT_SUCCESS(rc))
376	{
377	rc = pTimer->iError;
378	if (RT_SUCCESS(rc))
379	{
380	*ppTimer = pTimer;
381	return VINF_SUCCESS;
382	}
383	}
384	ASMAtomicXchgU32(&pTimer->u32Magic, RTTIMER_MAGIC + 1);
385	RTThreadWait(pTimer->Thread, 250, NULL);
386	CancelWaitableTimer(pTimer->hTimer);
387	}
388	#ifdef USE_APC
389	CloseHandle(pTimer->hevWait);
390	#endif
391	}
392	CloseHandle(pTimer->hTimer);
393	}
394	#endif /* !USE_WINMM */
395
396	AssertMsgFailed(("Failed to create timer uMilliesInterval=%d. rc=%d\n", uMilliesInterval, rc));
397	RTMemFree(pTimer);
398	}
399	else
400	rc = VERR_NO_MEMORY;
401	return rc;
402	}
403
404
405
406	/**
407	* Stops and destroys a running timer.
408	*
409	* @returns iprt status code.
410	* @param pTimer Timer to stop and destroy.
411	*/
412	RTR3DECL(int) RTTimerDestroy(PRTTIMER pTimer)
413	{
414	/* NULL is ok. */
415	if (!pTimer)
416	return VINF_SUCCESS;
417
418	/*
419	* Validate handle first.
420	*/
421	int rc;
422	if ( VALID_PTR(pTimer)
423	&& pTimer->u32Magic == RTTIMER_MAGIC)
424	{
425	#ifdef USE_WINMM
426	/*
427	* Kill the timer and exit.
428	*/
429	rc = timeKillEvent(pTimer->TimerId);
430	AssertMsg(rc == TIMERR_NOERROR, ("timeKillEvent -> %d\n", rc));
431	ASMAtomicXchgU32(&pTimer->u32Magic, RTTIMER_MAGIC + 1);
432	RTThreadSleep(1);
433
434	#else /* !USE_WINMM */
435
436	/*
437	* Signal that we want the thread to exit.
438	*/
439	ASMAtomicXchgU32(&pTimer->u32Magic, RTTIMER_MAGIC + 1);
440	#ifdef USE_APC
441	SetEvent(pTimer->hevWait);
442	CloseHandle(pTimer->hevWait);
443	rc = CancelWaitableTimer(pTimer->hTimer);
444	AssertMsg(rc, ("CancelWaitableTimer lasterr=%d\n", GetLastError()));
445	#else
446	LARGE_INTEGER ll = {0};
447	ll.LowPart = 100;
448	rc = SetWaitableTimer(pTimer->hTimer, &ll, 0, NULL, NULL, FALSE);
449	AssertMsg(rc, ("CancelWaitableTimer lasterr=%d\n", GetLastError()));
450	#endif
451
452	/*
453	* Wait for the thread to exit.
454	* And if it don't wanna exit, we'll get kill it.
455	*/
456	rc = RTThreadWait(pTimer->Thread, 1000, NULL);
457	if (RT_FAILURE(rc))
458	TerminateThread((HANDLE)RTThreadGetNative(pTimer->Thread), -1);
459
460	/*
461	* Free resource.
462	*/
463	rc = CloseHandle(pTimer->hTimer);
464	AssertMsg(rc, ("CloseHandle lasterr=%d\n", GetLastError()));
465
466	#endif /* !USE_WINMM */
467	RTMemFree(pTimer);
468	return rc;
469	}
470
471	rc = VERR_INVALID_HANDLE;
472	AssertMsgFailed(("Failed to destroy timer %p. rc=%d\n", pTimer, rc));
473	return rc;
474	}
475

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source: vbox/trunk/src/VBox/Runtime/r3/win32/timer-win32.cpp@ 729

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