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Diffstat (limited to '')
| -rw-r--r-- | src/VBox/Runtime/generic/timer-generic.cpp | 337 |
1 files changed, 337 insertions, 0 deletions
diff --git a/src/VBox/Runtime/generic/timer-generic.cpp b/src/VBox/Runtime/generic/timer-generic.cpp new file mode 100644 index 00000000..3b3ce0df --- /dev/null +++ b/src/VBox/Runtime/generic/timer-generic.cpp @@ -0,0 +1,337 @@ +/* $Id: timer-generic.cpp $ */ +/** @file + * IPRT - Timers, Generic. + */ + +/* + * Copyright (C) 2006-2019 Oracle Corporation + * + * This file is part of VirtualBox Open Source Edition (OSE), as + * available from http://www.virtualbox.org. This file is free software; + * you can redistribute it and/or modify it under the terms of the GNU + * General Public License (GPL) as published by the Free Software + * Foundation, in version 2 as it comes in the "COPYING" file of the + * VirtualBox OSE distribution. VirtualBox OSE is distributed in the + * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. + * + * The contents of this file may alternatively be used under the terms + * of the Common Development and Distribution License Version 1.0 + * (CDDL) only, as it comes in the "COPYING.CDDL" file of the + * VirtualBox OSE distribution, in which case the provisions of the + * CDDL are applicable instead of those of the GPL. + * + * You may elect to license modified versions of this file under the + * terms and conditions of either the GPL or the CDDL or both. + */ + + +/********************************************************************************************************************************* +* Header Files * +*********************************************************************************************************************************/ +#include <iprt/timer.h> +#include "internal/iprt.h" + +#include <iprt/thread.h> +#include <iprt/err.h> +#include <iprt/assert.h> +#include <iprt/alloc.h> +#include <iprt/asm.h> +#include <iprt/semaphore.h> +#include <iprt/time.h> +#include <iprt/log.h> +#include "internal/magics.h" + + + +/********************************************************************************************************************************* +* Structures and Typedefs * +*********************************************************************************************************************************/ +/** + * The internal representation of a timer handle. + */ +typedef struct RTTIMER +{ + /** Magic. + * This is RTTIMER_MAGIC, but changes to something else before the timer + * is destroyed to indicate clearly that thread should exit. */ + uint32_t volatile u32Magic; + /** Flag indicating the timer is suspended. */ + uint8_t volatile fSuspended; + /** Flag indicating that the timer has been destroyed. */ + uint8_t volatile fDestroyed; + /** Callback. */ + PFNRTTIMER pfnTimer; + /** User argument. */ + void *pvUser; + /** The timer thread. */ + RTTHREAD Thread; + /** Event semaphore on which the thread is blocked. */ + RTSEMEVENT Event; + /** The timer interval. 0 if one-shot. */ + uint64_t u64NanoInterval; + /** The start of the current run (ns). + * This is used to calculate when the timer ought to fire the next time. */ + uint64_t volatile u64StartTS; + /** The start of the current run (ns). + * This is used to calculate when the timer ought to fire the next time. */ + uint64_t volatile u64NextTS; + /** The current tick number (since u64StartTS). */ + uint64_t volatile iTick; +} RTTIMER; + + +/********************************************************************************************************************************* +* Internal Functions * +*********************************************************************************************************************************/ +static DECLCALLBACK(int) rtTimerThread(RTTHREAD Thread, void *pvUser); + + +RTDECL(int) RTTimerCreateEx(PRTTIMER *ppTimer, uint64_t u64NanoInterval, uint32_t fFlags, PFNRTTIMER pfnTimer, void *pvUser) +{ + *ppTimer = NULL; + + /* + * We don't support the fancy MP features. + */ + if (fFlags & RTTIMER_FLAGS_CPU_SPECIFIC) + return VERR_NOT_SUPPORTED; + + /* + * Allocate and initialize the timer handle. + */ + PRTTIMER pTimer = (PRTTIMER)RTMemAlloc(sizeof(*pTimer)); + if (!pTimer) + return VERR_NO_MEMORY; + + pTimer->u32Magic = RTTIMER_MAGIC; + pTimer->fSuspended = true; + pTimer->fDestroyed = false; + pTimer->pfnTimer = pfnTimer; + pTimer->pvUser = pvUser; + pTimer->Thread = NIL_RTTHREAD; + pTimer->Event = NIL_RTSEMEVENT; + pTimer->u64NanoInterval = u64NanoInterval; + pTimer->u64StartTS = 0; + + int rc = RTSemEventCreate(&pTimer->Event); + if (RT_SUCCESS(rc)) + { + rc = RTThreadCreate(&pTimer->Thread, rtTimerThread, pTimer, 0, RTTHREADTYPE_TIMER, RTTHREADFLAGS_WAITABLE, "Timer"); + if (RT_SUCCESS(rc)) + { + *ppTimer = pTimer; + return VINF_SUCCESS; + } + + pTimer->u32Magic = 0; + RTSemEventDestroy(pTimer->Event); + pTimer->Event = NIL_RTSEMEVENT; + } + RTMemFree(pTimer); + + return rc; +} +RT_EXPORT_SYMBOL(RTTimerCreateEx); + + +/** + * Validates the timer handle. + * + * @returns true if valid, false if invalid. + * @param pTimer The handle. + */ +DECLINLINE(bool) rtTimerIsValid(PRTTIMER pTimer) +{ + AssertReturn(VALID_PTR(pTimer), false); + AssertReturn(pTimer->u32Magic == RTTIMER_MAGIC, false); + AssertReturn(!pTimer->fDestroyed, false); + return true; +} + + +RTDECL(int) RTTimerDestroy(PRTTIMER pTimer) +{ + /* It's ok to pass NULL pointer. */ + if (pTimer == /*NIL_RTTIMER*/ NULL) + return VINF_SUCCESS; + if (!rtTimerIsValid(pTimer)) + return VERR_INVALID_HANDLE; + + /* + * If the timer is active, we stop and destruct it in one go, to avoid + * unnecessary waiting for the next tick. If it's suspended we can safely + * set the destroy flag and signal it. + */ + RTTHREAD Thread = pTimer->Thread; + if (!pTimer->fSuspended) + ASMAtomicXchgU8(&pTimer->fSuspended, true); + ASMAtomicXchgU8(&pTimer->fDestroyed, true); + int rc = RTSemEventSignal(pTimer->Event); + if (rc == VERR_ALREADY_POSTED) + rc = VINF_SUCCESS; + AssertRC(rc); + + RTThreadWait(Thread, 250, NULL); + return VINF_SUCCESS; +} +RT_EXPORT_SYMBOL(RTTimerDestroy); + + +RTDECL(int) RTTimerStart(PRTTIMER pTimer, uint64_t u64First) +{ + if (!rtTimerIsValid(pTimer)) + return VERR_INVALID_HANDLE; + if (!pTimer->fSuspended) + return VERR_TIMER_ACTIVE; + + /* + * Calc when it should start firing and give the thread a kick so it get going. + */ + u64First += RTTimeNanoTS(); + ASMAtomicXchgU64(&pTimer->iTick, 0); + ASMAtomicXchgU64(&pTimer->u64StartTS, u64First); + ASMAtomicXchgU64(&pTimer->u64NextTS, u64First); + ASMAtomicXchgU8(&pTimer->fSuspended, false); + int rc = RTSemEventSignal(pTimer->Event); + if (rc == VERR_ALREADY_POSTED) + rc = VINF_SUCCESS; + AssertRC(rc); + return rc; +} +RT_EXPORT_SYMBOL(RTTimerStart); + + +RTDECL(int) RTTimerStop(PRTTIMER pTimer) +{ + if (!rtTimerIsValid(pTimer)) + return VERR_INVALID_HANDLE; + if (pTimer->fSuspended) + return VERR_TIMER_SUSPENDED; + + /* + * Mark it as suspended and kick the thread. + */ + ASMAtomicXchgU8(&pTimer->fSuspended, true); + int rc = RTSemEventSignal(pTimer->Event); + if (rc == VERR_ALREADY_POSTED) + rc = VINF_SUCCESS; + AssertRC(rc); + return rc; +} +RT_EXPORT_SYMBOL(RTTimerStop); + + +RTDECL(int) RTTimerChangeInterval(PRTTIMER pTimer, uint64_t u64NanoInterval) +{ + if (!rtTimerIsValid(pTimer)) + return VERR_INVALID_HANDLE; + NOREF(u64NanoInterval); + return VERR_NOT_SUPPORTED; +} +RT_EXPORT_SYMBOL(RTTimerChangeInterval); + + +static DECLCALLBACK(int) rtTimerThread(RTTHREAD hThreadSelf, void *pvUser) +{ + PRTTIMER pTimer = (PRTTIMER)pvUser; + NOREF(hThreadSelf); + + /* + * The loop. + */ + while (!pTimer->fDestroyed) + { + if (pTimer->fSuspended) + { + int rc = RTSemEventWait(pTimer->Event, RT_INDEFINITE_WAIT); + if (RT_FAILURE(rc) && rc != VERR_INTERRUPTED) + { + AssertRC(rc); + RTThreadSleep(1000); /* Don't cause trouble! */ + } + } + else + { + const uint64_t u64NanoTS = RTTimeNanoTS(); + if (u64NanoTS >= pTimer->u64NextTS) + { + pTimer->iTick++; + + /* one shot? */ + if (!pTimer->u64NanoInterval) + ASMAtomicXchgU8(&pTimer->fSuspended, true); + pTimer->pfnTimer(pTimer, pTimer->pvUser, pTimer->iTick); + + /* status changed? */ + if (pTimer->fSuspended || pTimer->fDestroyed) + continue; + + /* calc the next time we should fire. */ + pTimer->u64NextTS = pTimer->u64StartTS + pTimer->iTick * pTimer->u64NanoInterval; + if (pTimer->u64NextTS < u64NanoTS) +#ifdef IN_RING3 /* In ring-3 we'll catch up lost ticks immediately. */ + pTimer->u64NextTS = u64NanoTS + 1; +#else + pTimer->u64NextTS = u64NanoTS + RTTimerGetSystemGranularity() / 2; +#endif + } + + /* block. */ + uint64_t cNanoSeconds = pTimer->u64NextTS - u64NanoTS; +#ifdef IN_RING3 /* In ring-3 we'll catch up lost ticks immediately. */ + if (cNanoSeconds > 10) +#endif + { + int rc = RTSemEventWait(pTimer->Event, cNanoSeconds < 1000000 ? 1 : cNanoSeconds / 1000000); + if (RT_FAILURE(rc) && rc != VERR_INTERRUPTED && rc != VERR_TIMEOUT) + { + AssertRC(rc); + RTThreadSleep(1000); /* Don't cause trouble! */ + } + } + } + } + + /* + * Release the timer resources. + */ + ASMAtomicIncU32(&pTimer->u32Magic); /* make the handle invalid. */ + int rc = RTSemEventDestroy(pTimer->Event); AssertRC(rc); + pTimer->Event = NIL_RTSEMEVENT; + pTimer->Thread = NIL_RTTHREAD; + RTMemFree(pTimer); + + return VINF_SUCCESS; +} + + + + +RTDECL(uint32_t) RTTimerGetSystemGranularity(void) +{ + return 10000000; /* 10ms */ +} +RT_EXPORT_SYMBOL(RTTimerGetSystemGranularity); + + +RTDECL(int) RTTimerRequestSystemGranularity(uint32_t u32Request, uint32_t *pu32Granted) +{ + NOREF(u32Request); NOREF(pu32Granted); + return VERR_NOT_SUPPORTED; +} +RT_EXPORT_SYMBOL(RTTimerRequestSystemGranularity); + + +RTDECL(int) RTTimerReleaseSystemGranularity(uint32_t u32Granted) +{ + NOREF(u32Granted); + return VERR_NOT_SUPPORTED; +} +RT_EXPORT_SYMBOL(RTTimerReleaseSystemGranularity); + + +RTDECL(bool) RTTimerCanDoHighResolution(void) +{ + return false; +} +RT_EXPORT_SYMBOL(RTTimerCanDoHighResolution); |