| 1 | /** @file
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| 2 | * IPRT - Timer.
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| 3 | */
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| 4 |
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| 5 | /*
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| 6 | * Copyright (C) 2006-2007 Sun Microsystems, Inc.
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| 7 | *
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| 8 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 9 | * available from http://www.virtualbox.org. This file is free software;
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| 10 | * you can redistribute it and/or modify it under the terms of the GNU
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| 11 | * General Public License (GPL) as published by the Free Software
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| 12 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 13 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 14 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 15 | *
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| 16 | * The contents of this file may alternatively be used under the terms
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| 17 | * of the Common Development and Distribution License Version 1.0
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| 18 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 19 | * VirtualBox OSE distribution, in which case the provisions of the
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| 20 | * CDDL are applicable instead of those of the GPL.
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| 21 | *
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| 22 | * You may elect to license modified versions of this file under the
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| 23 | * terms and conditions of either the GPL or the CDDL or both.
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| 24 | *
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| 25 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
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| 26 | * Clara, CA 95054 USA or visit http://www.sun.com if you need
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| 27 | * additional information or have any questions.
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| 28 | */
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| 29 |
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| 30 | #ifndef ___iprt_timer_h
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| 31 | #define ___iprt_timer_h
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| 32 |
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| 33 |
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| 34 | #include <iprt/cdefs.h>
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| 35 | #include <iprt/types.h>
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| 36 |
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| 37 |
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| 38 | __BEGIN_DECLS
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| 39 |
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| 40 | /** @defgroup grp_rt_timer RTTimer - Timer
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| 41 | *
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| 42 | * The IPRT timer API provides a simple abstraction of recurring and one-shot callback timers.
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| 43 | *
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| 44 | * Because of the great variation in the native APIs and the quality of
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| 45 | * the service delivered by those native APIs, the timers are operated
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| 46 | * on at best effort basis.
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| 47 | *
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| 48 | * All the ring-3 implementations are naturally at the mercy of the scheduler,
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| 49 | * which means that the callback rate might vary quite a bit and we might skip
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| 50 | * ticks. Many systems have a restriction that a process can only have one
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| 51 | * timer. IPRT currently makes no efforts at multiplexing timers in those kind
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| 52 | * of situations and will simply fail if you try to create more than one timer.
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| 53 | *
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| 54 | * Things are generally better in ring-0. The implementations will use interrupt
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| 55 | * time callbacks wherever available, and if not, resort to a high priority
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| 56 | * kernel thread.
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| 57 | *
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| 58 | * @ingroup grp_rt
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| 59 | * @{
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| 60 | */
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| 61 |
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| 62 |
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| 63 | /** Timer handle. */
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| 64 | typedef struct RTTIMER *PRTTIMER;
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| 65 |
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| 66 | /**
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| 67 | * Timer callback function.
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| 68 | *
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| 69 | * The context this call is made in varies with different platforms and
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| 70 | * kernel / user mode IPRT.
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| 71 | *
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| 72 | * In kernel mode a timer callback should not waste time, it shouldn't
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| 73 | * waste stack and it should be prepared that some APIs might not work
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| 74 | * correctly because of weird OS restrictions in this context that we
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| 75 | * haven't discovered and avoided yet. Please fix those APIs so they
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| 76 | * at least avoid panics and weird behaviour.
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| 77 | *
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| 78 | * @param pTimer Timer handle.
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| 79 | * @param pvUser User argument.
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| 80 | * @param iTick The current timer tick. This is always 1 on the first
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| 81 | * callback after the timer was started. For omni timers
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| 82 | * this will be 1 when a cpu comes back online.
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| 83 | */
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| 84 | typedef DECLCALLBACK(void) FNRTTIMER(PRTTIMER pTimer, void *pvUser, uint64_t iTick);
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| 85 | /** Pointer to FNRTTIMER() function. */
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| 86 | typedef FNRTTIMER *PFNRTTIMER;
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| 87 |
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| 88 |
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| 89 | /**
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| 90 | * Create a recurring timer.
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| 91 | *
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| 92 | * @returns iprt status code.
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| 93 | * @param ppTimer Where to store the timer handle.
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| 94 | * @param uMilliesInterval Milliseconds between the timer ticks.
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| 95 | * This is rounded up to the system granularity.
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| 96 | * @param pfnTimer Callback function which shall be scheduled for execution
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| 97 | * on every timer tick.
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| 98 | * @param pvUser User argument for the callback.
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| 99 | * @see RTTimerDestroy, RTTimerStop
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| 100 | */
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| 101 | RTDECL(int) RTTimerCreate(PRTTIMER *ppTimer, unsigned uMilliesInterval, PFNRTTIMER pfnTimer, void *pvUser);
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| 102 |
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| 103 | /**
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| 104 | * Create a suspended timer.
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| 105 | *
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| 106 | * @returns iprt status code.
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| 107 | * @retval VERR_NOT_SUPPORTED if an unsupported flag was specfied.
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| 108 | *
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| 109 | * @param ppTimer Where to store the timer handle.
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| 110 | * @param u64NanoInterval The interval between timer ticks specified in nanoseconds if it's
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| 111 | * a recurring timer. This is rounded to the fit the system timer granularity.
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| 112 | * For one shot timers, pass 0.
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| 113 | * @param fFlags Timer flags.
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| 114 | * @param pfnTimer Callback function which shall be scheduled for execution
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| 115 | * on every timer tick.
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| 116 | * @param pvUser User argument for the callback.
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| 117 | * @see RTTimerStart, RTTimerStop, RTTimerDestroy, RTTimerGetSystemGranularity
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| 118 | */
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| 119 | RTDECL(int) RTTimerCreateEx(PRTTIMER *ppTimer, uint64_t u64NanoInterval, unsigned fFlags, PFNRTTIMER pfnTimer, void *pvUser);
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| 120 |
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| 121 | /** @name RTTimerCreateEx flags
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| 122 | * @{ */
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| 123 | /** Any CPU is fine. (Must be 0.) */
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| 124 | #define RTTIMER_FLAGS_CPU_ANY 0
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| 125 | /** One specific CPU */
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| 126 | #define RTTIMER_FLAGS_CPU_SPECIFIC RT_BIT(8)
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| 127 | /** Omni timer, run on all online CPUs.
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| 128 | * @remarks The timer callback isn't necessarily running at the time same time on each CPU. */
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| 129 | #define RTTIMER_FLAGS_CPU_ALL ( RTTIMER_FLAGS_CPU_MASK | RTTIMER_FLAGS_CPU_SPECIFIC )
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| 130 | /** CPU mask. */
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| 131 | #define RTTIMER_FLAGS_CPU_MASK 0xff
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| 132 | /** Convert a CPU number (0-based) to RTTimerCreateEx flags.
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| 133 | * This will automatically OR in the RTTIMER_FLAG_CPU_SPECIFIC flag. */
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| 134 | #define RTTIMER_FLAGS_CPU(iCpu) ( (iCpu) | RTTIMER_FLAG_CPU_SPECIFIC )
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| 135 | /** Macro that validates the flags. */
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| 136 | #define RTTIMER_FLAGS_ARE_VALID(fFlags) ( !((fFlags) & ((fFlags) & RTTIMER_FLAGS_CPU_SPECIFIC ? 0x1ff : 0x100)) )
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| 137 | /** @} */
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| 138 |
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| 139 | /**
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| 140 | * Stops and destroys a running timer.
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| 141 | *
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| 142 | * @returns iprt status code.
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| 143 | * @param pTimer Timer to stop and destroy. NULL is ok.
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| 144 | */
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| 145 | RTDECL(int) RTTimerDestroy(PRTTIMER pTimer);
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| 146 |
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| 147 | /**
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| 148 | * Stops an active timer.
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| 149 | *
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| 150 | * @returns IPRT status code.
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| 151 | * @retval VERR_INVALID_HANDLE if pTimer isn't valid.
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| 152 | * @retval VERR_TIMER_ACTIVE if the timer isn't suspended.
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| 153 | *
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| 154 | * @param pTimer The timer to activate.
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| 155 | * @param u64First The RTTimeSystemNanoTS() for when the timer should start
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| 156 | * firing (relative). If 0 is specified, the timer will fire ASAP.
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| 157 | * @see RTTimerStop
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| 158 | */
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| 159 | RTDECL(int) RTTimerStart(PRTTIMER pTimer, uint64_t u64First);
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| 160 |
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| 161 | /**
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| 162 | * Stops an active timer.
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| 163 | *
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| 164 | * @returns IPRT status code.
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| 165 | * @retval VERR_INVALID_HANDLE if pTimer isn't valid.
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| 166 | * @retval VERR_TIMER_SUSPENDED if the timer isn't active.
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| 167 | * @retval VERR_NOT_SUPPORTED if the IPRT implementation doesn't support stopping a timer.
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| 168 | *
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| 169 | * @param pTimer The timer to suspend.
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| 170 | * @see RTTimerStart
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| 171 | */
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| 172 | RTDECL(int) RTTimerStop(PRTTIMER pTimer);
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| 173 |
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| 174 |
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| 175 | /**
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| 176 | * Gets the (current) timer granularity of the system.
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| 177 | *
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| 178 | * @returns The timer granularity of the system in nanoseconds.
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| 179 | * @see RTTimerRequestSystemGranularity
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| 180 | */
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| 181 | RTDECL(uint32_t) RTTimerGetSystemGranularity(void);
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| 182 |
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| 183 | /**
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| 184 | * Requests a specific system timer granularity.
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| 185 | *
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| 186 | * Successfull calls to this API must be coupled with the exact same number of
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| 187 | * calls to RTTimerReleaseSystemGranularity() in order to undo any changes made.
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| 188 | *
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| 189 | *
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| 190 | * @returns IPRT status code.
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| 191 | * @retval VERR_NOT_SUPPORTED if the requested value isn't supported by the host platform
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| 192 | * or if the host platform doesn't support modifying the system timer granularity.
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| 193 | * @retval VERR_PERMISSION_DENIED if the caller doesn't have the necessary privilege to
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| 194 | * modify the system timer granularity.
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| 195 | *
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| 196 | * @param u32Request The requested system timer granularity in nanoseconds.
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| 197 | * @param pu32Granted Where to store the granted system granularity. This is the value
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| 198 | * that should be passed to RTTimerReleaseSystemGranularity(). It
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| 199 | * is what RTTimerGetSystemGranularity() would return immediately
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| 200 | * after the change was made.
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| 201 | *
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| 202 | * The value differ from the request in two ways; rounding and
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| 203 | * scale. Meaning if your request is for 10.000.000 you might
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| 204 | * be granted 10.000.055 or 1.000.000.
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| 205 | * @see RTTimerReleaseSystemGranularity, RTTimerGetSystemGranularity
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| 206 | */
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| 207 | RTDECL(int) RTTimerRequestSystemGranularity(uint32_t u32Request, uint32_t *pu32Granted);
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| 208 |
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| 209 | /**
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| 210 | * Releases a system timer granularity grant acquired by RTTimerRequestSystemGranularity().
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| 211 | *
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| 212 | * @returns IPRT status code.
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| 213 | * @retval VERR_NOT_SUPPORTED if the host platform doesn't have any way of modifying
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| 214 | * the system timer granularity.
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| 215 | * @retval VERR_WRONG_ORDER if nobody call RTTimerRequestSystemGranularity() with the
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| 216 | * given grant value.
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| 217 | * @param u32Granted The granted system granularity.
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| 218 | * @see RTTimerRequestSystemGranularity
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| 219 | */
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| 220 | RTDECL(int) RTTimerReleaseSystemGranularity(uint32_t u32Granted);
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| 221 |
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| 222 | /** @} */
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| 223 |
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| 224 | __END_DECLS
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| 225 |
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| 226 | #endif
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