timer-posix.cpp@ 39093

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1	/* $Id: timer-posix.cpp 39093 2011-10-24 14:01:50Z vboxsync $ */
2	/** @file
3	* IPRT - Timer, POSIX.
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	* 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	* Defined Constants And Macros *
29	*******************************************************************************/
30	/** Enables the use of POSIX RT timers. */
31	#ifndef RT_OS_SOLARIS /* Solaris 10 doesn't have SIGEV_THREAD */
32	# define IPRT_WITH_POSIX_TIMERS
33	#endif /* !RT_OS_SOLARIS */
34
35	/** @def RT_TIMER_SIGNAL
36	* The signal number that the timers use.
37	* We currently use SIGALRM for both setitimer and posix real time timers
38	* out of simplicity, but we might want change this later for the posix ones. */
39	#ifdef IPRT_WITH_POSIX_TIMERS
40	# define RT_TIMER_SIGNAL SIGALRM
41	#else
42	# define RT_TIMER_SIGNAL SIGALRM
43	#endif
44
45
46	/*******************************************************************************
47	* Header Files *
48	*******************************************************************************/
49	#define LOG_GROUP RTLOGGROUP_TIMER
50	#include <iprt/timer.h>
51	#include <iprt/alloc.h>
52	#include <iprt/assert.h>
53	#include <iprt/thread.h>
54	#include <iprt/log.h>
55	#include <iprt/asm.h>
56	#include <iprt/semaphore.h>
57	#include <iprt/string.h>
58	#include <iprt/once.h>
59	#include <iprt/err.h>
60	#include <iprt/critsect.h>
61	#include "internal/magics.h"
62
63	#include <unistd.h>
64	#include <sys/fcntl.h>
65	#include <sys/ioctl.h>
66	#ifdef RT_OS_LINUX
67	# include <linux/rtc.h>
68	#endif
69	#include <sys/time.h>
70	#include <signal.h>
71	#include <errno.h>
72	#include <pthread.h>
73
74
75	/*******************************************************************************
76	* Global Variables *
77	*******************************************************************************/
78	#ifdef IPRT_WITH_POSIX_TIMERS
79	/** Init the critsect on first call. */
80	static RTONCE g_TimerOnce = RTONCE_INITIALIZER;
81	/** Global critsect that serializes timer creation and destruction.
82	* This is lazily created on the first RTTimerCreateEx call and will not be
83	* freed up (I'm afraid). */
84	static RTCRITSECT g_TimerCritSect;
85	/**
86	* Global counter of RTTimer instances. The signal thread is
87	* started when it changes from 0 to 1. The signal thread
88	* terminates when it becomes 0 again.
89	*/
90	static uint32_t volatile g_cTimerInstances;
91	/** The signal handling thread. */
92	static RTTHREAD g_TimerThread;
93	#endif /* IPRT_WITH_POSIX_TIMERS */
94
95
96	/*******************************************************************************
97	* Structures and Typedefs *
98	*******************************************************************************/
99	/**
100	* The internal representation of a timer handle.
101	*/
102	typedef struct RTTIMER
103	{
104	/** Magic.
105	* This is RTTIMER_MAGIC, but changes to something else before the timer
106	* is destroyed to indicate clearly that thread should exit. */
107	uint32_t volatile u32Magic;
108	/** Flag indicating the timer is suspended. */
109	uint8_t volatile fSuspended;
110	/** Flag indicating that the timer has been destroyed. */
111	uint8_t volatile fDestroyed;
112	#ifndef IPRT_WITH_POSIX_TIMERS /** @todo We have to take the signals on a dedicated timer thread as
113	* we (might) have code assuming that signals doesn't screw around
114	* on existing threads. (It would be sufficient to have one thread
115	* per signal of course since the signal will be masked while it's
116	* running, however, it may just cause more complications than its
117	* worth - sigwait/sigwaitinfo work atomically anyway...)
118	* Also, must block the signal in the thread main procedure too. */
119	/** The timer thread. */
120	RTTHREAD Thread;
121	/** Event semaphore on which the thread is blocked. */
122	RTSEMEVENT Event;
123	#endif /* !IPRT_WITH_POSIX_TIMERS */
124	/** User argument. */
125	void *pvUser;
126	/** Callback. */
127	PFNRTTIMER pfnTimer;
128	/** The timer interval. 0 if one-shot. */
129	uint64_t u64NanoInterval;
130	#ifndef IPRT_WITH_POSIX_TIMERS
131	/** The first shot interval. 0 if ASAP. */
132	uint64_t volatile u64NanoFirst;
133	#endif /* !IPRT_WITH_POSIX_TIMERS */
134	/** The current timer tick. */
135	uint64_t volatile iTick;
136	#ifndef IPRT_WITH_POSIX_TIMERS
137	/** The error/status of the timer.
138	* Initially -1, set to 0 when the timer have been successfully started, and
139	* to errno on failure in starting the timer. */
140	int volatile iError;
141	#else /* IPRT_WITH_POSIX_TIMERS */
142	timer_t NativeTimer;
143	#endif /* IPRT_WITH_POSIX_TIMERS */
144
145	} RTTIMER;
146
147
148
149	#ifdef IPRT_WITH_POSIX_TIMERS
150
151	/**
152	* RTOnce callback that initializes the critical section.
153	*
154	* @returns RTCritSectInit return code.
155	* @param pvUser1 NULL, ignored.
156	* @param pvUser2 NULL, ignored.
157	*
158	*/
159	static DECLCALLBACK(int) rtTimerOnce(void pvUser1, void pvUser2)
160	{
161	NOREF(pvUser1);
162	NOREF(pvUser2);
163	return RTCritSectInit(&g_TimerCritSect);
164	}
165	#endif
166
167
168	/**
169	* Signal handler which ignore everything it gets.
170	*
171	* @param iSignal The signal number.
172	*/
173	static void rttimerSignalIgnore(int iSignal)
174	{
175	//AssertBreakpoint();
176	NOREF(iSignal);
177	}
178
179
180	/**
181	* RT_TIMER_SIGNAL wait thread.
182	*/
183	static DECLCALLBACK(int) rttimerThread(RTTHREAD hThreadSelf, void *pvArg)
184	{
185	NOREF(hThreadSelf); NOREF(pvArg);
186	#ifndef IPRT_WITH_POSIX_TIMERS
187	PRTTIMER pTimer = (PRTTIMER)pvArg;
188	RTTIMER Timer = *pTimer;
189	Assert(pTimer->u32Magic == RTTIMER_MAGIC);
190	#endif /* !IPRT_WITH_POSIX_TIMERS */
191
192	/*
193	* Install signal handler.
194	*/
195	struct sigaction SigAct;
196	memset(&SigAct, 0, sizeof(SigAct));
197	SigAct.sa_flags = SA_RESTART;
198	sigemptyset(&SigAct.sa_mask);
199	SigAct.sa_handler = rttimerSignalIgnore;
200	if (sigaction(RT_TIMER_SIGNAL, &SigAct, NULL))
201	{
202	SigAct.sa_flags &= ~SA_RESTART;
203	if (sigaction(RT_TIMER_SIGNAL, &SigAct, NULL))
204	AssertMsgFailed(("sigaction failed, errno=%d\n", errno));
205	}
206
207	/*
208	* Mask most signals except those which might be used by the pthread implementation (linux).
209	*/
210	sigset_t SigSet;
211	sigfillset(&SigSet);
212	sigdelset(&SigSet, SIGTERM);
213	sigdelset(&SigSet, SIGHUP);
214	sigdelset(&SigSet, SIGINT);
215	sigdelset(&SigSet, SIGABRT);
216	sigdelset(&SigSet, SIGKILL);
217	#ifdef SIGRTMIN
218	for (int iSig = SIGRTMIN; iSig < SIGRTMAX; iSig++)
219	sigdelset(&SigSet, iSig);
220	#endif
221	if (sigprocmask(SIG_SETMASK, &SigSet, NULL))
222	{
223	#ifdef IPRT_WITH_POSIX_TIMERS
224	int rc = RTErrConvertFromErrno(errno);
225	#else
226	int rc = pTimer->iError = RTErrConvertFromErrno(errno);
227	#endif
228	AssertMsgFailed(("sigprocmask -> errno=%d\n", errno));
229	return rc;
230	}
231
232	/*
233	* The work loop.
234	*/
235	RTThreadUserSignal(hThreadSelf);
236
237	#ifndef IPRT_WITH_POSIX_TIMERS
238	while ( !pTimer->fDestroyed
239	&& pTimer->u32Magic == RTTIMER_MAGIC)
240	{
241	/*
242	* Wait for a start or destroy event.
243	*/
244	if (pTimer->fSuspended)
245	{
246	int rc = RTSemEventWait(pTimer->Event, RT_INDEFINITE_WAIT);
247	if (RT_FAILURE(rc) && rc != VERR_INTERRUPTED)
248	{
249	AssertRC(rc);
250	if (pTimer->fDestroyed)
251	continue;
252	RTThreadSleep(1000); /* Don't cause trouble! */
253	}
254	if ( pTimer->fSuspended
255	\|\| pTimer->fDestroyed)
256	continue;
257	}
258
259	/*
260	* Start the timer.
261	*
262	* For some SunOS (/SysV?) threading compatibility Linux will only
263	* deliver the RT_TIMER_SIGNAL to the thread calling setitimer(). Therefore
264	* we have to call it here.
265	*
266	* It turns out this might not always be the case, see RT_TIMER_SIGNAL killing
267	* processes on RH 2.4.21.
268	*/
269	struct itimerval TimerVal;
270	if (pTimer->u64NanoFirst)
271	{
272	uint64_t u64 = RT_MAX(1000, pTimer->u64NanoFirst);
273	TimerVal.it_value.tv_sec = u64 / 1000000000;
274	TimerVal.it_value.tv_usec = (u64 % 1000000000) / 1000;
275	}
276	else
277	{
278	TimerVal.it_value.tv_sec = 0;
279	TimerVal.it_value.tv_usec = 10;
280	}
281	if (pTimer->u64NanoInterval)
282	{
283	uint64_t u64 = RT_MAX(1000, pTimer->u64NanoInterval);
284	TimerVal.it_interval.tv_sec = u64 / 1000000000;
285	TimerVal.it_interval.tv_usec = (u64 % 1000000000) / 1000;
286	}
287	else
288	{
289	TimerVal.it_interval.tv_sec = 0;
290	TimerVal.it_interval.tv_usec = 0;
291	}
292
293	if (setitimer(ITIMER_REAL, &TimerVal, NULL))
294	{
295	ASMAtomicXchgU8(&pTimer->fSuspended, true);
296	pTimer->iError = RTErrConvertFromErrno(errno);
297	RTThreadUserSignal(hThreadSelf);
298	continue; /* back to suspended mode. */
299	}
300	pTimer->iError = 0;
301	RTThreadUserSignal(hThreadSelf);
302
303	/*
304	* Timer Service Loop.
305	*/
306	sigemptyset(&SigSet);
307	sigaddset(&SigSet, RT_TIMER_SIGNAL);
308	do
309	{
310	siginfo_t SigInfo;
311	RT_ZERO(SigInfo);
312	#ifdef RT_OS_DARWIN
313	if (RT_LIKELY(sigwait(&SigSet, &SigInfo.si_signo) >= 0))
314	{
315	#else
316	if (RT_LIKELY(sigwaitinfo(&SigSet, &SigInfo) >= 0))
317	{
318	if (RT_LIKELY(SigInfo.si_signo == RT_TIMER_SIGNAL))
319	#endif
320	{
321	if (RT_UNLIKELY( pTimer->fSuspended
322	\|\| pTimer->fDestroyed
323	\|\| pTimer->u32Magic != RTTIMER_MAGIC))
324	break;
325
326	pTimer->pfnTimer(pTimer, pTimer->pvUser, ++pTimer->iTick);
327
328	/* auto suspend one-shot timers. */
329	if (RT_UNLIKELY(!pTimer->u64NanoInterval))
330	{
331	ASMAtomicWriteU8(&pTimer->fSuspended, true);
332	break;
333	}
334	}
335	}
336	else if (errno != EINTR)
337	AssertMsgFailed(("sigwaitinfo -> errno=%d\n", errno));
338	} while (RT_LIKELY( !pTimer->fSuspended
339	&& !pTimer->fDestroyed
340	&& pTimer->u32Magic == RTTIMER_MAGIC));
341
342	/*
343	* Disable the timer.
344	*/
345	struct itimerval TimerVal2 = {{0,0}, {0,0}};
346	if (setitimer(ITIMER_REAL, &TimerVal2, NULL))
347	AssertMsgFailed(("setitimer(ITIMER_REAL,&{0}, NULL) failed, errno=%d\n", errno));
348
349	/*
350	* ACK any pending suspend request.
351	*/
352	if (!pTimer->fDestroyed)
353	{
354	pTimer->iError = 0;
355	RTThreadUserSignal(hThreadSelf);
356	}
357	}
358
359	/*
360	* Exit.
361	*/
362	pTimer->iError = 0;
363	RTThreadUserSignal(hThreadSelf);
364
365	#else /* IPRT_WITH_POSIX_TIMERS */
366
367	sigemptyset(&SigSet);
368	sigaddset(&SigSet, RT_TIMER_SIGNAL);
369	while (g_cTimerInstances)
370	{
371	siginfo_t SigInfo;
372	RT_ZERO(SigInfo);
373	if (RT_LIKELY(sigwaitinfo(&SigSet, &SigInfo) >= 0))
374	{
375	LogFlow(("rttimerThread: signo=%d pTimer=%p\n", SigInfo.si_signo, SigInfo.si_value.sival_ptr));
376	if (RT_LIKELY( SigInfo.si_signo == RT_TIMER_SIGNAL
377	&& SigInfo.si_code == SI_TIMER)) /* The SI_TIMER check is essential because of the pthread_kill. */
378	{
379	PRTTIMER pTimer = (PRTTIMER)SigInfo.si_value.sival_ptr;
380	AssertPtr(pTimer);
381	if (RT_UNLIKELY( !VALID_PTR(pTimer)
382	\|\| ASMAtomicUoReadU8(&pTimer->fSuspended)
383	\|\| ASMAtomicUoReadU8(&pTimer->fDestroyed)
384	\|\| pTimer->u32Magic != RTTIMER_MAGIC))
385	continue;
386
387	pTimer->pfnTimer(pTimer, pTimer->pvUser, ++pTimer->iTick);
388
389	/* auto suspend one-shot timers. */
390	if (RT_UNLIKELY(!pTimer->u64NanoInterval))
391	ASMAtomicWriteU8(&pTimer->fSuspended, true);
392	}
393	}
394	}
395	#endif /* IPRT_WITH_POSIX_TIMERS */
396
397	return VINF_SUCCESS;
398	}
399
400
401	RTDECL(int) RTTimerCreateEx(PRTTIMER ppTimer, uint64_t u64NanoInterval, uint32_t fFlags, PFNRTTIMER pfnTimer, void pvUser)
402	{
403	/*
404	* We don't support the fancy MP features.
405	*/
406	if (fFlags & RTTIMER_FLAGS_CPU_SPECIFIC)
407	return VERR_NOT_SUPPORTED;
408
409	#ifndef IPRT_WITH_POSIX_TIMERS
410	/*
411	* Check if timer is busy.
412	*/
413	struct itimerval TimerVal;
414	if (getitimer(ITIMER_REAL, &TimerVal))
415	{
416	AssertMsgFailed(("getitimer() -> errno=%d\n", errno));
417	return VERR_NOT_IMPLEMENTED;
418	}
419	if ( TimerVal.it_value.tv_usec
420	\|\| TimerVal.it_value.tv_sec
421	\|\| TimerVal.it_interval.tv_usec
422	\|\| TimerVal.it_interval.tv_sec)
423	{
424	AssertMsgFailed(("A timer is running. System limit is one timer per process!\n"));
425	return VERR_TIMER_BUSY;
426	}
427	#endif /* !IPRT_WITH_POSIX_TIMERS */
428
429	/*
430	* Block RT_TIMER_SIGNAL from calling thread.
431	*/
432	sigset_t SigSet;
433	sigemptyset(&SigSet);
434	sigaddset(&SigSet, RT_TIMER_SIGNAL);
435	sigprocmask(SIG_BLOCK, &SigSet, NULL);
436
437	#ifndef IPRT_WITH_POSIX_TIMERS /** @todo combine more of the setitimer/timer_create code. setitimer could also use the global thread. */
438	/** @todo Move this RTC hack else where... */
439	static bool fDoneRTC;
440	if (!fDoneRTC)
441	{
442	fDoneRTC = true;
443	/* check resolution. */
444	TimerVal.it_interval.tv_sec = 0;
445	TimerVal.it_interval.tv_usec = 1000;
446	TimerVal.it_value = TimerVal.it_interval;
447	if ( setitimer(ITIMER_REAL, &TimerVal, NULL)
448	\|\| getitimer(ITIMER_REAL, &TimerVal)
449	\|\| TimerVal.it_interval.tv_usec > 1000)
450	{
451	/*
452	* Try open /dev/rtc to set the irq rate to 1024 and
453	* turn periodic
454	*/
455	Log(("RTTimerCreate: interval={%ld,%ld} trying to adjust /dev/rtc!\n", TimerVal.it_interval.tv_sec, TimerVal.it_interval.tv_usec));
456	# ifdef RT_OS_LINUX
457	int fh = open("/dev/rtc", O_RDONLY);
458	if (fh >= 0)
459	{
460	if ( ioctl(fh, RTC_IRQP_SET, 1024) < 0
461	\|\| ioctl(fh, RTC_PIE_ON, 0) < 0)
462	Log(("RTTimerCreate: couldn't configure rtc! errno=%d\n", errno));
463	ioctl(fh, F_SETFL, O_ASYNC);
464	ioctl(fh, F_SETOWN, getpid());
465	/* not so sure if closing it is a good idea... */
466	//close(fh);
467	}
468	else
469	Log(("RTTimerCreate: couldn't configure rtc! open failed with errno=%d\n", errno));
470	# endif
471	}
472	/* disable it */
473	TimerVal.it_interval.tv_sec = 0;
474	TimerVal.it_interval.tv_usec = 0;
475	TimerVal.it_value = TimerVal.it_interval;
476	setitimer(ITIMER_REAL, &TimerVal, NULL);
477	}
478
479	/*
480	* Create a new timer.
481	*/
482	int rc;
483	PRTTIMER pTimer = (PRTTIMER)RTMemAlloc(sizeof(*pTimer));
484	if (pTimer)
485	{
486	pTimer->u32Magic = RTTIMER_MAGIC;
487	pTimer->fSuspended = true;
488	pTimer->fDestroyed = false;
489	pTimer->Thread = NIL_RTTHREAD;
490	pTimer->Event = NIL_RTSEMEVENT;
491	pTimer->pfnTimer = pfnTimer;
492	pTimer->pvUser = pvUser;
493	pTimer->u64NanoInterval = u64NanoInterval;
494	pTimer->u64NanoFirst = 0;
495	pTimer->iTick = 0;
496	pTimer->iError = 0;
497	rc = RTSemEventCreate(&pTimer->Event);
498	AssertRC(rc);
499	if (RT_SUCCESS(rc))
500	{
501	rc = RTThreadCreate(&pTimer->Thread, rttimerThread, pTimer, 0, RTTHREADTYPE_TIMER, RTTHREADFLAGS_WAITABLE, "Timer");
502	AssertRC(rc);
503	if (RT_SUCCESS(rc))
504	{
505	/*
506	* Wait for the timer thread to initialize it self.
507	* This might take a little while...
508	*/
509	rc = RTThreadUserWait(pTimer->Thread, 45*1000);
510	AssertRC(rc);
511	if (RT_SUCCESS(rc))
512	{
513	rc = RTThreadUserReset(pTimer->Thread); AssertRC(rc);
514	rc = pTimer->iError;
515	AssertRC(rc);
516	if (RT_SUCCESS(rc))
517	{
518	RTThreadYield(); /* <-- Horrible hack to make tstTimer work. (linux 2.6.12) */
519	*ppTimer = pTimer;
520	return VINF_SUCCESS;
521	}
522	}
523
524	/* bail out */
525	ASMAtomicXchgU8(&pTimer->fDestroyed, true);
526	ASMAtomicXchgU32(&pTimer->u32Magic, ~RTTIMER_MAGIC);
527	RTThreadWait(pTimer->Thread, 45*1000, NULL);
528	}
529	RTSemEventDestroy(pTimer->Event);
530	pTimer->Event = NIL_RTSEMEVENT;
531	}
532	RTMemFree(pTimer);
533	}
534	else
535	rc = VERR_NO_MEMORY;
536
537	#else /* IPRT_WITH_POSIX_TIMERS */
538
539	/*
540	* Do the global init first.
541	*/
542	int rc = RTOnce(&g_TimerOnce, rtTimerOnce, NULL, NULL);
543	if (RT_FAILURE(rc))
544	return rc;
545
546	/*
547	* Create a new timer structure.
548	*/
549	LogFlow(("RTTimerCreateEx: u64NanoInterval=%llu fFlags=%lu\n", u64NanoInterval, fFlags));
550	PRTTIMER pTimer = (PRTTIMER)RTMemAlloc(sizeof(*pTimer));
551	if (pTimer)
552	{
553	/* Initialize timer structure. */
554	pTimer->u32Magic = RTTIMER_MAGIC;
555	pTimer->fSuspended = true;
556	pTimer->fDestroyed = false;
557	pTimer->pfnTimer = pfnTimer;
558	pTimer->pvUser = pvUser;
559	pTimer->u64NanoInterval = u64NanoInterval;
560	pTimer->iTick = 0;
561
562	/*
563	* Create a timer that deliver RT_TIMER_SIGNAL upon timer expiration.
564	*/
565	struct sigevent SigEvt;
566	SigEvt.sigev_notify = SIGEV_SIGNAL;
567	SigEvt.sigev_signo = RT_TIMER_SIGNAL;
568	SigEvt.sigev_value.sival_ptr = pTimer; /* sigev_value gets copied to siginfo. */
569	int err = timer_create(CLOCK_REALTIME, &SigEvt, &pTimer->NativeTimer);
570	if (!err)
571	{
572	/*
573	* Increment the timer count, do this behind the critsect to avoid races.
574	*/
575	RTCritSectEnter(&g_TimerCritSect);
576
577	if (ASMAtomicIncU32(&g_cTimerInstances) != 1)
578	{
579	Assert(g_cTimerInstances > 1);
580	RTCritSectLeave(&g_TimerCritSect);
581
582	LogFlow(("RTTimerCreateEx: rc=%Rrc pTimer=%p (thread already running)\n", rc, pTimer));
583	*ppTimer = pTimer;
584	return VINF_SUCCESS;
585	}
586
587	/*
588	* Create the signal handling thread. It will wait for the signal
589	* and execute the timer functions.
590	*/
591	rc = RTThreadCreate(&g_TimerThread, rttimerThread, NULL, 0, RTTHREADTYPE_TIMER, RTTHREADFLAGS_WAITABLE, "Timer");
592	if (RT_SUCCESS(rc))
593	{
594	rc = RTThreadUserWait(g_TimerThread, 451000); / this better not fail... */
595	if (RT_SUCCESS(rc))
596	{
597	RTCritSectLeave(&g_TimerCritSect);
598
599	LogFlow(("RTTimerCreateEx: rc=%Rrc pTimer=%p (thread already running)\n", rc, pTimer));
600	*ppTimer = pTimer;
601	return VINF_SUCCESS;
602	}
603	/* darn, what do we do here? */
604	}
605
606	/* bail out */
607	ASMAtomicDecU32(&g_cTimerInstances);
608	Assert(!g_cTimerInstances);
609
610	RTCritSectLeave(&g_TimerCritSect);
611
612	timer_delete(pTimer->NativeTimer);
613	}
614	else
615	{
616	rc = RTErrConvertFromErrno(err);
617	Log(("RTTimerCreateEx: err=%d (%Rrc)\n", err, rc));
618	}
619
620	RTMemFree(pTimer);
621	}
622	else
623	rc = VERR_NO_MEMORY;
624
625	#endif /* IPRT_WITH_POSIX_TIMERS */
626	return rc;
627	}
628
629
630	RTR3DECL(int) RTTimerDestroy(PRTTIMER pTimer)
631	{
632	LogFlow(("RTTimerDestroy: pTimer=%p\n", pTimer));
633
634	/*
635	* Validate input.
636	*/
637	/* NULL is ok. */
638	if (!pTimer)
639	return VINF_SUCCESS;
640	int rc = VINF_SUCCESS;
641	AssertPtrReturn(pTimer, VERR_INVALID_POINTER);
642	AssertReturn(pTimer->u32Magic == RTTIMER_MAGIC, VERR_INVALID_MAGIC);
643	#ifdef IPRT_WITH_POSIX_TIMERS
644	AssertReturn(g_TimerThread != RTThreadSelf(), VERR_INTERNAL_ERROR);
645	#else
646	AssertReturn(pTimer->Thread != RTThreadSelf(), VERR_INTERNAL_ERROR);
647	#endif
648
649	/*
650	* Mark the semaphore as destroyed.
651	*/
652	ASMAtomicWriteU8(&pTimer->fDestroyed, true);
653	ASMAtomicWriteU32(&pTimer->u32Magic, ~RTTIMER_MAGIC);
654
655	#ifdef IPRT_WITH_POSIX_TIMERS
656	/*
657	* Suspend the timer if it's running.
658	*/
659	if (pTimer->fSuspended)
660	{
661	struct itimerspec TimerSpec;
662	TimerSpec.it_value.tv_sec = 0;
663	TimerSpec.it_value.tv_nsec = 0;
664	int err = timer_settime(pTimer->NativeTimer, 0, &TimerSpec, NULL); NOREF(err);
665	AssertMsg(!err, ("%d\n", err));
666	}
667	#endif
668
669	/*
670	* Poke the thread and wait for it to finish.
671	* This is only done for the last timer when using posix timers.
672	*/
673	#ifdef IPRT_WITH_POSIX_TIMERS
674	RTTHREAD Thread = NIL_RTTHREAD;
675	RTCritSectEnter(&g_TimerCritSect);
676	if (ASMAtomicDecU32(&g_cTimerInstances) == 0)
677	{
678	Thread = g_TimerThread;
679	g_TimerThread = NIL_RTTHREAD;
680	}
681	RTCritSectLeave(&g_TimerCritSect);
682	#else /* IPRT_WITH_POSIX_TIMERS */
683	RTTHREAD Thread = pTimer->Thread;
684	rc = RTSemEventSignal(pTimer->Event);
685	AssertRC(rc);
686	#endif /* IPRT_WITH_POSIX_TIMERS */
687	if (Thread != NIL_RTTHREAD)
688	{
689	/* Signal it so it gets out of the sigwait if it's stuck there... */
690	pthread_kill((pthread_t)RTThreadGetNative(Thread), RT_TIMER_SIGNAL);
691
692	/*
693	* Wait for the thread to complete.
694	*/
695	rc = RTThreadWait(Thread, 30 * 1000, NULL);
696	AssertRC(rc);
697	}
698
699
700	/*
701	* Free up the resources associated with the timer.
702	*/
703	#ifdef IPRT_WITH_POSIX_TIMERS
704	timer_delete(pTimer->NativeTimer);
705	#else
706	RTSemEventDestroy(pTimer->Event);
707	pTimer->Event = NIL_RTSEMEVENT;
708	#endif /* !IPRT_WITH_POSIX_TIMERS */
709	if (RT_SUCCESS(rc))
710	RTMemFree(pTimer);
711	return rc;
712	}
713
714
715	RTDECL(int) RTTimerStart(PRTTIMER pTimer, uint64_t u64First)
716	{
717	/*
718	* Validate input.
719	*/
720	AssertPtrReturn(pTimer, VERR_INVALID_POINTER);
721	AssertReturn(pTimer->u32Magic == RTTIMER_MAGIC, VERR_INVALID_MAGIC);
722	#ifndef IPRT_WITH_POSIX_TIMERS
723	AssertReturn(pTimer->Thread != RTThreadSelf(), VERR_INTERNAL_ERROR);
724	#endif
725
726	/*
727	* Already running?
728	*/
729	if (!ASMAtomicXchgU8(&pTimer->fSuspended, false))
730	return VERR_TIMER_ACTIVE;
731	LogFlow(("RTTimerStart: pTimer=%p u64First=%llu u64NanoInterval=%llu\n", pTimer, u64First, pTimer->u64NanoInterval));
732
733	#ifndef IPRT_WITH_POSIX_TIMERS
734	/*
735	* Tell the thread to start servicing the timer.
736	* Wait for it to ACK the request to avoid reset races.
737	*/
738	RTThreadUserReset(pTimer->Thread);
739	ASMAtomicUoWriteU64(&pTimer->u64NanoFirst, u64First);
740	ASMAtomicUoWriteU64(&pTimer->iTick, 0);
741	ASMAtomicWriteU8(&pTimer->fSuspended, false);
742	int rc = RTSemEventSignal(pTimer->Event);
743	if (RT_SUCCESS(rc))
744	{
745	rc = RTThreadUserWait(pTimer->Thread, 45*1000);
746	AssertRC(rc);
747	RTThreadUserReset(pTimer->Thread);
748	}
749	else
750	AssertRC(rc);
751
752	#else /* IPRT_WITH_POSIX_TIMERS */
753	/*
754	* Start the timer.
755	*/
756	struct itimerspec TimerSpec;
757	TimerSpec.it_value.tv_sec = u64First / 1000000000; /* nanosec => sec */
758	TimerSpec.it_value.tv_nsec = u64First ? u64First % 1000000000 : 10; /* 0 means disable, replace it with 10. */
759	TimerSpec.it_interval.tv_sec = pTimer->u64NanoInterval / 1000000000;
760	TimerSpec.it_interval.tv_nsec = pTimer->u64NanoInterval % 1000000000;
761	int err = timer_settime(pTimer->NativeTimer, 0, &TimerSpec, NULL);
762	int rc = RTErrConvertFromErrno(err);
763	#endif /* IPRT_WITH_POSIX_TIMERS */
764
765	if (RT_FAILURE(rc))
766	ASMAtomicXchgU8(&pTimer->fSuspended, false);
767	return rc;
768	}
769
770
771	RTDECL(int) RTTimerStop(PRTTIMER pTimer)
772	{
773	/*
774	* Validate input.
775	*/
776	AssertPtrReturn(pTimer, VERR_INVALID_POINTER);
777	AssertReturn(pTimer->u32Magic == RTTIMER_MAGIC, VERR_INVALID_MAGIC);
778
779	/*
780	* Already running?
781	*/
782	if (ASMAtomicXchgU8(&pTimer->fSuspended, true))
783	return VERR_TIMER_SUSPENDED;
784	LogFlow(("RTTimerStop: pTimer=%p\n", pTimer));
785
786	#ifndef IPRT_WITH_POSIX_TIMERS
787	/*
788	* Tell the thread to stop servicing the timer.
789	*/
790	RTThreadUserReset(pTimer->Thread);
791	ASMAtomicXchgU8(&pTimer->fSuspended, true);
792	int rc = VINF_SUCCESS;
793	if (RTThreadSelf() != pTimer->Thread)
794	{
795	pthread_kill((pthread_t)RTThreadGetNative(pTimer->Thread), RT_TIMER_SIGNAL);
796	rc = RTThreadUserWait(pTimer->Thread, 45*1000);
797	AssertRC(rc);
798	RTThreadUserReset(pTimer->Thread);
799	}
800
801	#else /* IPRT_WITH_POSIX_TIMERS */
802	/*
803	* Stop the timer.
804	*/
805	struct itimerspec TimerSpec;
806	TimerSpec.it_value.tv_sec = 0;
807	TimerSpec.it_value.tv_nsec = 0;
808	int err = timer_settime(pTimer->NativeTimer, 0, &TimerSpec, NULL);
809	int rc = RTErrConvertFromErrno(err);
810	#endif /* IPRT_WITH_POSIX_TIMERS */
811
812	return rc;
813	}
814
815
816	RTDECL(int) RTTimerChangeInterval(PRTTIMER pTimer, uint64_t u64NanoInterval)
817	{
818	AssertPtrReturn(pTimer, VERR_INVALID_POINTER);
819	AssertReturn(pTimer->u32Magic == RTTIMER_MAGIC, VERR_INVALID_MAGIC);
820	NOREF(u64NanoInterval);
821	return VERR_NOT_SUPPORTED;
822	}
823

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source: vbox/trunk/src/VBox/Runtime/r3/posix/timer-posix.cpp@ 39093

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