| 1 | /* $Id: timer-generic.cpp 98103 2023-01-17 14:15:46Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - Timers, Generic.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2023 Oracle and/or its affiliates.
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| 8 | *
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| 9 | * This file is part of VirtualBox base platform packages, as
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| 10 | * available from https://www.virtualbox.org.
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| 11 | *
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| 12 | * This program is free software; you can redistribute it and/or
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| 13 | * modify it under the terms of the GNU General Public License
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| 14 | * as published by the Free Software Foundation, in version 3 of the
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| 15 | * License.
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| 16 | *
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| 17 | * This program is distributed in the hope that it will be useful, but
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| 18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 20 | * General Public License for more details.
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| 21 | *
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| 22 | * You should have received a copy of the GNU General Public License
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| 23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 24 | *
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| 25 | * The contents of this file may alternatively be used under the terms
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| 26 | * of the Common Development and Distribution License Version 1.0
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| 27 | * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
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| 28 | * in the VirtualBox distribution, in which case the provisions of the
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| 29 | * CDDL are applicable instead of those of the GPL.
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| 30 | *
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| 31 | * You may elect to license modified versions of this file under the
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| 32 | * terms and conditions of either the GPL or the CDDL or both.
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| 33 | *
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| 34 | * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
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| 35 | */
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| 36 |
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| 37 |
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| 38 | /*********************************************************************************************************************************
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| 39 | * Header Files *
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| 40 | *********************************************************************************************************************************/
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| 41 | #include <iprt/timer.h>
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| 42 | #include "internal/iprt.h"
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| 43 |
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| 44 | #include <iprt/thread.h>
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| 45 | #include <iprt/err.h>
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| 46 | #include <iprt/assert.h>
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| 47 | #include <iprt/alloc.h>
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| 48 | #include <iprt/asm.h>
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| 49 | #include <iprt/semaphore.h>
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| 50 | #include <iprt/time.h>
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| 51 | #include <iprt/log.h>
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| 52 | #include "internal/magics.h"
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| 53 |
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| 54 |
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| 55 |
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| 56 | /*********************************************************************************************************************************
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| 57 | * Structures and Typedefs *
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| 58 | *********************************************************************************************************************************/
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| 59 | /**
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| 60 | * The internal representation of a timer handle.
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| 61 | */
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| 62 | typedef struct RTTIMER
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| 63 | {
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| 64 | /** Magic.
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| 65 | * This is RTTIMER_MAGIC, but changes to something else before the timer
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| 66 | * is destroyed to indicate clearly that thread should exit. */
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| 67 | uint32_t volatile u32Magic;
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| 68 | /** Flag indicating the timer is suspended. */
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| 69 | uint8_t volatile fSuspended;
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| 70 | /** Flag indicating that the timer has been destroyed. */
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| 71 | uint8_t volatile fDestroyed;
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| 72 | /** Callback. */
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| 73 | PFNRTTIMER pfnTimer;
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| 74 | /** User argument. */
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| 75 | void *pvUser;
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| 76 | /** The timer thread. */
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| 77 | RTTHREAD Thread;
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| 78 | /** Event semaphore on which the thread is blocked. */
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| 79 | RTSEMEVENT Event;
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| 80 | /** The timer interval. 0 if one-shot. */
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| 81 | uint64_t u64NanoInterval;
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| 82 | /** The start of the current run (ns).
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| 83 | * This is used to calculate when the timer ought to fire the next time. */
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| 84 | uint64_t volatile u64StartTS;
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| 85 | /** The start of the current run (ns).
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| 86 | * This is used to calculate when the timer ought to fire the next time. */
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| 87 | uint64_t volatile u64NextTS;
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| 88 | /** The current tick number (since u64StartTS). */
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| 89 | uint64_t volatile iTick;
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| 90 | } RTTIMER;
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| 91 |
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| 92 |
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| 93 | /*********************************************************************************************************************************
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| 94 | * Internal Functions *
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| 95 | *********************************************************************************************************************************/
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| 96 | static DECLCALLBACK(int) rtTimerThread(RTTHREAD Thread, void *pvUser);
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| 97 |
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| 98 |
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| 99 | RTDECL(int) RTTimerCreateEx(PRTTIMER *ppTimer, uint64_t u64NanoInterval, uint32_t fFlags, PFNRTTIMER pfnTimer, void *pvUser)
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| 100 | {
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| 101 | *ppTimer = NULL;
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| 102 |
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| 103 | /*
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| 104 | * We don't support the fancy MP features.
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| 105 | */
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| 106 | if (fFlags & RTTIMER_FLAGS_CPU_SPECIFIC)
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| 107 | return VERR_NOT_SUPPORTED;
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| 108 |
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| 109 | /*
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| 110 | * Allocate and initialize the timer handle.
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| 111 | */
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| 112 | PRTTIMER pTimer = (PRTTIMER)RTMemAlloc(sizeof(*pTimer));
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| 113 | if (!pTimer)
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| 114 | return VERR_NO_MEMORY;
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| 115 |
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| 116 | pTimer->u32Magic = RTTIMER_MAGIC;
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| 117 | pTimer->fSuspended = true;
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| 118 | pTimer->fDestroyed = false;
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| 119 | pTimer->pfnTimer = pfnTimer;
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| 120 | pTimer->pvUser = pvUser;
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| 121 | pTimer->Thread = NIL_RTTHREAD;
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| 122 | pTimer->Event = NIL_RTSEMEVENT;
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| 123 | pTimer->u64NanoInterval = u64NanoInterval;
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| 124 | pTimer->u64StartTS = 0;
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| 125 |
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| 126 | int rc = RTSemEventCreate(&pTimer->Event);
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| 127 | if (RT_SUCCESS(rc))
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| 128 | {
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| 129 | rc = RTThreadCreate(&pTimer->Thread, rtTimerThread, pTimer, 0, RTTHREADTYPE_TIMER, RTTHREADFLAGS_WAITABLE, "Timer");
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| 130 | if (RT_SUCCESS(rc))
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| 131 | {
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| 132 | *ppTimer = pTimer;
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| 133 | return VINF_SUCCESS;
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| 134 | }
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| 135 |
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| 136 | pTimer->u32Magic = 0;
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| 137 | RTSemEventDestroy(pTimer->Event);
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| 138 | pTimer->Event = NIL_RTSEMEVENT;
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| 139 | }
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| 140 | RTMemFree(pTimer);
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| 141 |
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| 142 | return rc;
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| 143 | }
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| 144 | RT_EXPORT_SYMBOL(RTTimerCreateEx);
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| 145 |
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| 146 |
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| 147 | /**
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| 148 | * Validates the timer handle.
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| 149 | *
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| 150 | * @returns true if valid, false if invalid.
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| 151 | * @param pTimer The handle.
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| 152 | */
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| 153 | DECLINLINE(bool) rtTimerIsValid(PRTTIMER pTimer)
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| 154 | {
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| 155 | AssertPtrReturn(pTimer, false);
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| 156 | AssertReturn(pTimer->u32Magic == RTTIMER_MAGIC, false);
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| 157 | AssertReturn(!pTimer->fDestroyed, false);
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| 158 | return true;
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| 159 | }
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| 160 |
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| 161 |
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| 162 | RTDECL(int) RTTimerDestroy(PRTTIMER pTimer)
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| 163 | {
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| 164 | /* It's ok to pass NULL pointer. */
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| 165 | if (pTimer == /*NIL_RTTIMER*/ NULL)
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| 166 | return VINF_SUCCESS;
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| 167 | if (!rtTimerIsValid(pTimer))
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| 168 | return VERR_INVALID_HANDLE;
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| 169 |
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| 170 | /*
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| 171 | * If the timer is active, we stop and destruct it in one go, to avoid
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| 172 | * unnecessary waiting for the next tick. If it's suspended we can safely
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| 173 | * set the destroy flag and signal it.
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| 174 | */
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| 175 | RTTHREAD Thread = pTimer->Thread;
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| 176 | if (!pTimer->fSuspended)
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| 177 | ASMAtomicXchgU8(&pTimer->fSuspended, true);
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| 178 | ASMAtomicXchgU8(&pTimer->fDestroyed, true);
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| 179 | int rc = RTSemEventSignal(pTimer->Event);
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| 180 | if (rc == VERR_ALREADY_POSTED)
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| 181 | rc = VINF_SUCCESS;
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| 182 | AssertRC(rc);
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| 183 |
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| 184 | RTThreadWait(Thread, 250, NULL);
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| 185 | return VINF_SUCCESS;
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| 186 | }
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| 187 | RT_EXPORT_SYMBOL(RTTimerDestroy);
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| 188 |
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| 189 |
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| 190 | RTDECL(int) RTTimerStart(PRTTIMER pTimer, uint64_t u64First)
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| 191 | {
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| 192 | if (!rtTimerIsValid(pTimer))
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| 193 | return VERR_INVALID_HANDLE;
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| 194 | if (!pTimer->fSuspended)
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| 195 | return VERR_TIMER_ACTIVE;
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| 196 |
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| 197 | /*
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| 198 | * Calc when it should start firing and give the thread a kick so it get going.
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| 199 | */
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| 200 | u64First += RTTimeNanoTS();
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| 201 | ASMAtomicXchgU64(&pTimer->iTick, 0);
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| 202 | ASMAtomicXchgU64(&pTimer->u64StartTS, u64First);
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| 203 | ASMAtomicXchgU64(&pTimer->u64NextTS, u64First);
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| 204 | ASMAtomicXchgU8(&pTimer->fSuspended, false);
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| 205 | int rc = RTSemEventSignal(pTimer->Event);
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| 206 | if (rc == VERR_ALREADY_POSTED)
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| 207 | rc = VINF_SUCCESS;
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| 208 | AssertRC(rc);
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| 209 | return rc;
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| 210 | }
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| 211 | RT_EXPORT_SYMBOL(RTTimerStart);
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| 212 |
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| 213 |
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| 214 | RTDECL(int) RTTimerStop(PRTTIMER pTimer)
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| 215 | {
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| 216 | if (!rtTimerIsValid(pTimer))
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| 217 | return VERR_INVALID_HANDLE;
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| 218 | if (pTimer->fSuspended)
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| 219 | return VERR_TIMER_SUSPENDED;
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| 220 |
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| 221 | /*
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| 222 | * Mark it as suspended and kick the thread.
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| 223 | */
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| 224 | ASMAtomicXchgU8(&pTimer->fSuspended, true);
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| 225 | int rc = RTSemEventSignal(pTimer->Event);
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| 226 | if (rc == VERR_ALREADY_POSTED)
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| 227 | rc = VINF_SUCCESS;
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| 228 | AssertRC(rc);
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| 229 | return rc;
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| 230 | }
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| 231 | RT_EXPORT_SYMBOL(RTTimerStop);
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| 232 |
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| 233 |
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| 234 | RTDECL(int) RTTimerChangeInterval(PRTTIMER pTimer, uint64_t u64NanoInterval)
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| 235 | {
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| 236 | if (!rtTimerIsValid(pTimer))
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| 237 | return VERR_INVALID_HANDLE;
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| 238 | NOREF(u64NanoInterval);
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| 239 | return VERR_NOT_SUPPORTED;
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| 240 | }
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| 241 | RT_EXPORT_SYMBOL(RTTimerChangeInterval);
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| 242 |
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| 243 |
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| 244 | static DECLCALLBACK(int) rtTimerThread(RTTHREAD hThreadSelf, void *pvUser)
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| 245 | {
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| 246 | PRTTIMER pTimer = (PRTTIMER)pvUser;
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| 247 | NOREF(hThreadSelf);
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| 248 |
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| 249 | /*
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| 250 | * The loop.
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| 251 | */
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| 252 | while (!pTimer->fDestroyed)
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| 253 | {
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| 254 | if (pTimer->fSuspended)
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| 255 | {
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| 256 | int rc = RTSemEventWait(pTimer->Event, RT_INDEFINITE_WAIT);
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| 257 | if (RT_FAILURE(rc) && rc != VERR_INTERRUPTED)
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| 258 | {
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| 259 | AssertRC(rc);
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| 260 | RTThreadSleep(1000); /* Don't cause trouble! */
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| 261 | }
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| 262 | }
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| 263 | else
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| 264 | {
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| 265 | const uint64_t u64NanoTS = RTTimeNanoTS();
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| 266 | if (u64NanoTS >= pTimer->u64NextTS)
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| 267 | {
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| 268 | pTimer->iTick++;
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| 269 |
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| 270 | /* one shot? */
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| 271 | if (!pTimer->u64NanoInterval)
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| 272 | ASMAtomicXchgU8(&pTimer->fSuspended, true);
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| 273 | pTimer->pfnTimer(pTimer, pTimer->pvUser, pTimer->iTick);
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| 274 |
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| 275 | /* status changed? */
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| 276 | if (pTimer->fSuspended || pTimer->fDestroyed)
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| 277 | continue;
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| 278 |
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| 279 | /* calc the next time we should fire. */
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| 280 | pTimer->u64NextTS = pTimer->u64StartTS + pTimer->iTick * pTimer->u64NanoInterval;
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| 281 | if (pTimer->u64NextTS < u64NanoTS)
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| 282 | #ifdef IN_RING3 /* In ring-3 we'll catch up lost ticks immediately. */
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| 283 | pTimer->u64NextTS = u64NanoTS + 1;
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| 284 | #else
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| 285 | pTimer->u64NextTS = u64NanoTS + RTTimerGetSystemGranularity() / 2;
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| 286 | #endif
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| 287 | }
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| 288 |
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| 289 | /* block. */
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| 290 | uint64_t cNanoSeconds = pTimer->u64NextTS - u64NanoTS;
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| 291 | #ifdef IN_RING3 /* In ring-3 we'll catch up lost ticks immediately. */
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| 292 | if (cNanoSeconds > 10)
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| 293 | #endif
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| 294 | {
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| 295 | int rc = RTSemEventWait(pTimer->Event, cNanoSeconds < 1000000 ? 1 : cNanoSeconds / 1000000);
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| 296 | if (RT_FAILURE(rc) && rc != VERR_INTERRUPTED && rc != VERR_TIMEOUT)
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| 297 | {
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| 298 | AssertRC(rc);
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| 299 | RTThreadSleep(1000); /* Don't cause trouble! */
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| 300 | }
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| 301 | }
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| 302 | }
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| 303 | }
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| 304 |
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| 305 | /*
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| 306 | * Release the timer resources.
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| 307 | */
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| 308 | ASMAtomicIncU32(&pTimer->u32Magic); /* make the handle invalid. */
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| 309 | int rc = RTSemEventDestroy(pTimer->Event); AssertRC(rc);
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| 310 | pTimer->Event = NIL_RTSEMEVENT;
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| 311 | pTimer->Thread = NIL_RTTHREAD;
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| 312 | RTMemFree(pTimer);
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| 313 |
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| 314 | return VINF_SUCCESS;
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| 315 | }
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| 316 |
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| 317 |
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| 318 |
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| 319 |
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| 320 | RTDECL(uint32_t) RTTimerGetSystemGranularity(void)
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| 321 | {
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| 322 | return 10000000; /* 10ms */
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| 323 | }
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| 324 | RT_EXPORT_SYMBOL(RTTimerGetSystemGranularity);
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| 325 |
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| 326 |
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| 327 | RTDECL(int) RTTimerRequestSystemGranularity(uint32_t u32Request, uint32_t *pu32Granted)
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| 328 | {
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| 329 | NOREF(u32Request); NOREF(pu32Granted);
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| 330 | return VERR_NOT_SUPPORTED;
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| 331 | }
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| 332 | RT_EXPORT_SYMBOL(RTTimerRequestSystemGranularity);
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| 333 |
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| 334 |
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| 335 | RTDECL(int) RTTimerReleaseSystemGranularity(uint32_t u32Granted)
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| 336 | {
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| 337 | NOREF(u32Granted);
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| 338 | return VERR_NOT_SUPPORTED;
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| 339 | }
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| 340 | RT_EXPORT_SYMBOL(RTTimerReleaseSystemGranularity);
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| 341 |
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| 342 |
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| 343 | RTDECL(bool) RTTimerCanDoHighResolution(void)
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| 344 | {
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| 345 | return false;
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| 346 | }
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| 347 | RT_EXPORT_SYMBOL(RTTimerCanDoHighResolution);
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