VirtualBox

source: vbox/trunk/src/VBox/Runtime/generic/timer-generic.cpp@ 4968

Last change on this file since 4968 was 4750, checked in by vboxsync, 17 years ago

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1/** $Id: timer-generic.cpp 4750 2007-09-13 07:05:03Z vboxsync $ */
2/** @file
3 * innotek Portable Runtime - Timers, Generic.
4 */
5
6/*
7 * Copyright (C) 2006-2007 innotek 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
18
19/*******************************************************************************
20* Header Files *
21*******************************************************************************/
22#include <iprt/timer.h>
23#include <iprt/thread.h>
24#include <iprt/err.h>
25#include <iprt/assert.h>
26#include <iprt/alloc.h>
27#include <iprt/asm.h>
28#include <iprt/semaphore.h>
29#include <iprt/time.h>
30#include <iprt/log.h>
31#include "internal/magics.h"
32
33
34
35/*******************************************************************************
36* Structures and Typedefs *
37*******************************************************************************/
38/**
39 * The internal representation of a timer handle.
40 */
41typedef struct RTTIMER
42{
43 /** Magic.
44 * This is RTTIMER_MAGIC, but changes to something else before the timer
45 * is destroyed to indicate clearly that thread should exit. */
46 uint32_t volatile u32Magic;
47 /** Flag indicating the the timer is suspended. */
48 uint8_t volatile fSuspended;
49 /** Flag indicating that the timer has been destroyed. */
50 uint8_t volatile fDestroyed;
51 /** Callback. */
52 PFNRTTIMER pfnTimer;
53 /** User argument. */
54 void *pvUser;
55 /** The timer thread. */
56 RTTHREAD Thread;
57 /** Event semaphore on which the thread is blocked. */
58 RTSEMEVENT Event;
59 /** The timer interval. 0 if one-shot. */
60 uint64_t u64NanoInterval;
61 /** The start of the current run.
62 * This is used to calculate when the timer ought to fire the next time. */
63 uint64_t volatile u64StartTS;
64 /** The start of the current run.
65 * This is used to calculate when the timer ought to fire the next time. */
66 uint64_t volatile u64NextTS;
67 /** The current tick number (since u64StartTS). */
68 uint64_t volatile iTick;
69} RTTIMER;
70
71
72/*******************************************************************************
73* Internal Functions *
74*******************************************************************************/
75static DECLCALLBACK(int) rtTimerThread(RTTHREAD Thread, void *pvUser);
76
77
78RTDECL(int) RTTimerCreateEx(PRTTIMER *ppTimer, uint64_t u64NanoInterval, unsigned fFlags, PFNRTTIMER pfnTimer, void *pvUser)
79{
80 *ppTimer = NULL;
81
82 /*
83 * Allocate and initialize the timer handle.
84 */
85 PRTTIMER pTimer = (PRTTIMER)RTMemAlloc(sizeof(*pTimer));
86 if (!pTimer)
87 return VERR_NO_MEMORY;
88
89 pTimer->u32Magic = RTTIMER_MAGIC;
90 pTimer->fSuspended = true;
91 pTimer->fDestroyed = false;
92 pTimer->pfnTimer = pfnTimer;
93 pTimer->pvUser = pvUser;
94 pTimer->Thread = NIL_RTTHREAD;
95 pTimer->Event = NIL_RTSEMEVENT;
96 pTimer->u64NanoInterval = u64NanoInterval;
97 pTimer->u64StartTS = 0;
98
99 int rc = RTSemEventCreate(&pTimer->Event);
100 if (RT_SUCCESS(rc))
101 {
102 rc = RTThreadCreate(&pTimer->Thread, rtTimerThread, pTimer, 0, RTTHREADTYPE_TIMER, RTTHREADFLAGS_WAITABLE, "TIMER");
103 if (RT_SUCCESS(rc))
104 {
105 *ppTimer = pTimer;
106 return VINF_SUCCESS;
107 }
108
109 pTimer->u32Magic = 0;
110 RTSemEventDestroy(pTimer->Event);
111 pTimer->Event = NIL_RTSEMEVENT;
112 }
113 RTMemFree(pTimer);
114
115 return rc;
116}
117
118
119/**
120 * Validates the timer handle.
121 *
122 * @returns true if valid, false if invalid.
123 * @param pTimer The handle.
124 */
125DECLINLINE(bool) rtTimerIsValid(PRTTIMER pTimer)
126{
127 AssertReturn(VALID_PTR(pTimer), false);
128 AssertReturn(pTimer->u32Magic == RTTIMER_MAGIC, false);
129 AssertReturn(!pTimer->fDestroyed, false);
130 return true;
131}
132
133
134RTDECL(int) RTTimerDestroy(PRTTIMER pTimer)
135{
136 /* It's ok to pass NULL pointer. */
137 if (pTimer == /*NIL_RTTIMER*/ NULL)
138 return VINF_SUCCESS;
139 if (!rtTimerIsValid(pTimer))
140 return VERR_INVALID_HANDLE;
141
142 /*
143 * If the timer is active, we just flag it to self destruct on the next tick.
144 * If it's suspended we can safely set the destroy flag and signal it.
145 */
146 RTTHREAD Thread = pTimer->Thread;
147 if (!pTimer->fSuspended)
148 {
149 ASMAtomicXchgU8(&pTimer->fSuspended, true);
150 ASMAtomicXchgU8(&pTimer->fDestroyed, true);
151 }
152 else
153 {
154 ASMAtomicXchgU8(&pTimer->fDestroyed, true);
155 int rc = RTSemEventSignal(pTimer->Event);
156 if (rc == VERR_ALREADY_POSTED)
157 rc = VINF_SUCCESS;
158 AssertRC(rc);
159 }
160
161 RTThreadWait(Thread, 250, NULL);
162 return VINF_SUCCESS;
163}
164
165
166RTDECL(int) RTTimerStart(PRTTIMER pTimer, uint64_t u64First)
167{
168 if (!rtTimerIsValid(pTimer))
169 return VERR_INVALID_HANDLE;
170 if (!pTimer->fSuspended)
171 return VERR_TIMER_ACTIVE;
172
173 /*
174 * Calc when it should start fireing and give the thread a kick so it get going.
175 */
176 u64First += RTTimeNanoTS();
177 ASMAtomicXchgU64(&pTimer->iTick, 0);
178 ASMAtomicXchgU64(&pTimer->u64StartTS, u64First);
179 ASMAtomicXchgU64(&pTimer->u64NextTS, u64First);
180 ASMAtomicXchgU8(&pTimer->fSuspended, false);
181 int rc = RTSemEventSignal(pTimer->Event);
182 if (rc == VERR_ALREADY_POSTED)
183 rc = VINF_SUCCESS;
184 AssertRC(rc);
185 return rc;
186}
187
188
189RTDECL(int) RTTimerStop(PRTTIMER pTimer)
190{
191 if (!rtTimerIsValid(pTimer))
192 return VERR_INVALID_HANDLE;
193 if (pTimer->fSuspended)
194 return VERR_TIMER_SUSPENDED;
195
196 /*
197 * Mark it as suspended and kick the thread.
198 */
199 ASMAtomicXchgU8(&pTimer->fSuspended, true);
200 int rc = RTSemEventSignal(pTimer->Event);
201 if (rc == VERR_ALREADY_POSTED)
202 rc = VINF_SUCCESS;
203 AssertRC(rc);
204 return rc;
205}
206
207
208static DECLCALLBACK(int) rtTimerThread(RTTHREAD Thread, void *pvUser)
209{
210 PRTTIMER pTimer = (PRTTIMER)pvUser;
211
212 /*
213 * The loop.
214 */
215 while (!pTimer->fDestroyed)
216 {
217 if (pTimer->fSuspended)
218 {
219 int rc = RTSemEventWait(pTimer->Event, RT_INDEFINITE_WAIT);
220 if (RT_FAILURE(rc) && rc != VERR_INTERRUPTED)
221 {
222 AssertRC(rc);
223 RTThreadSleep(1000); /* Don't cause trouble! */
224 }
225 }
226 else
227 {
228 const uint64_t u64NanoTS = RTTimeNanoTS();
229 if (u64NanoTS >= pTimer->u64NextTS)
230 {
231 pTimer->iTick++;
232 pTimer->pfnTimer(pTimer, pTimer->pvUser);
233
234 /* status changed? */
235 if (pTimer->fSuspended || pTimer->fDestroyed)
236 continue;
237
238 /* one shot? */
239 if (!pTimer->u64NanoInterval)
240 {
241 ASMAtomicXchgU8(&pTimer->fSuspended, true);
242 continue;
243 }
244
245 /* calc the next time we should fire. */
246 pTimer->u64NextTS = pTimer->u64StartTS + pTimer->iTick * pTimer->u64NanoInterval;
247 if (pTimer->u64NextTS < u64NanoTS)
248#ifdef IN_RING3 /* In ring-3 we'll catch up lost ticks immediately. */
249 pTimer->u64NextTS = u64NanoTS + 1;
250#else
251 pTimer->u64NextTS = u64NanoTS + RTTimerGetSystemGranularity() / 2;
252#endif
253 }
254
255 /* block. */
256 uint64_t cNanoSeconds = pTimer->u64NextTS - u64NanoTS;
257#ifdef IN_RING3 /* In ring-3 we'll catch up lost ticks immediately. */
258 if (cNanoSeconds > 10)
259#endif
260 {
261 int rc = RTSemEventWait(pTimer->Event, cNanoSeconds < 1000000 ? 1 : cNanoSeconds / 1000000);
262 if (RT_FAILURE(rc) && rc != VERR_INTERRUPTED && rc != VERR_TIMEOUT)
263 {
264 AssertRC(rc);
265 RTThreadSleep(1000); /* Don't cause trouble! */
266 }
267 }
268 }
269 }
270
271 /*
272 * Release the timer resources.
273 */
274 ASMAtomicIncU32(&pTimer->u32Magic); /* make the handle invalid. */
275 int rc = RTSemEventDestroy(pTimer->Event); AssertRC(rc);
276 pTimer->Event = NIL_RTSEMEVENT;
277 pTimer->Thread = NIL_RTTHREAD;
278 RTMemFree(pTimer);
279
280 return VINF_SUCCESS;
281}
282
283
284
285
286RTDECL(uint32_t) RTTimerGetSystemGranularity(void)
287{
288 return 10000000; /* 10ms */
289}
290
291
292RTDECL(int) RTTimerRequestSystemGranularity(uint32_t u32Request, uint32_t *pu32Granted)
293{
294 return VERR_NOT_SUPPORTED;
295}
296
297
298RTDECL(int) RTTimerReleaseSystemGranularity(uint32_t u32Granted)
299{
300 return VERR_NOT_SUPPORTED;
301}
302
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