| 1 | /** @file
|
|---|
| 2 | * IPRT - Timer.
|
|---|
| 3 | */
|
|---|
| 4 |
|
|---|
| 5 | /*
|
|---|
| 6 | * Copyright (C) 2006-2022 Oracle and/or its affiliates.
|
|---|
| 7 | *
|
|---|
| 8 | * This file is part of VirtualBox base platform packages, as
|
|---|
| 9 | * available from https://www.virtualbox.org.
|
|---|
| 10 | *
|
|---|
| 11 | * This program is free software; you can redistribute it and/or
|
|---|
| 12 | * modify it under the terms of the GNU General Public License
|
|---|
| 13 | * as published by the Free Software Foundation, in version 3 of the
|
|---|
| 14 | * License.
|
|---|
| 15 | *
|
|---|
| 16 | * This program is distributed in the hope that it will be useful, but
|
|---|
| 17 | * WITHOUT ANY WARRANTY; without even the implied warranty of
|
|---|
| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|---|
| 19 | * General Public License for more details.
|
|---|
| 20 | *
|
|---|
| 21 | * You should have received a copy of the GNU General Public License
|
|---|
| 22 | * along with this program; if not, see <https://www.gnu.org/licenses>.
|
|---|
| 23 | *
|
|---|
| 24 | * The contents of this file may alternatively be used under the terms
|
|---|
| 25 | * of the Common Development and Distribution License Version 1.0
|
|---|
| 26 | * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
|
|---|
| 27 | * in the VirtualBox distribution, in which case the provisions of the
|
|---|
| 28 | * CDDL are applicable instead of those of the GPL.
|
|---|
| 29 | *
|
|---|
| 30 | * You may elect to license modified versions of this file under the
|
|---|
| 31 | * terms and conditions of either the GPL or the CDDL or both.
|
|---|
| 32 | *
|
|---|
| 33 | * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
|
|---|
| 34 | */
|
|---|
| 35 |
|
|---|
| 36 | #ifndef IPRT_INCLUDED_timer_h
|
|---|
| 37 | #define IPRT_INCLUDED_timer_h
|
|---|
| 38 | #ifndef RT_WITHOUT_PRAGMA_ONCE
|
|---|
| 39 | # pragma once
|
|---|
| 40 | #endif
|
|---|
| 41 |
|
|---|
| 42 |
|
|---|
| 43 | #include <iprt/cdefs.h>
|
|---|
| 44 | #include <iprt/types.h>
|
|---|
| 45 |
|
|---|
| 46 |
|
|---|
| 47 | RT_C_DECLS_BEGIN
|
|---|
| 48 |
|
|---|
| 49 | /** @defgroup grp_rt_timer RTTimer - Timer
|
|---|
| 50 | *
|
|---|
| 51 | * The IPRT timer API provides a simple abstraction of recurring and one-shot callback timers.
|
|---|
| 52 | *
|
|---|
| 53 | * Because of the great variation in the native APIs and the quality of
|
|---|
| 54 | * the service delivered by those native APIs, the timers are operated
|
|---|
| 55 | * on at best effort basis.
|
|---|
| 56 | *
|
|---|
| 57 | * All the ring-3 implementations are naturally at the mercy of the scheduler,
|
|---|
| 58 | * which means that the callback rate might vary quite a bit and we might skip
|
|---|
| 59 | * ticks. Many systems have a restriction that a process can only have one
|
|---|
| 60 | * timer. IPRT currently makes no efforts at multiplexing timers in those kind
|
|---|
| 61 | * of situations and will simply fail if you try to create more than one timer.
|
|---|
| 62 | *
|
|---|
| 63 | * Things are generally better in ring-0. The implementations will use interrupt
|
|---|
| 64 | * time callbacks wherever available, and if not, resort to a high priority
|
|---|
| 65 | * kernel thread.
|
|---|
| 66 | *
|
|---|
| 67 | * @ingroup grp_rt
|
|---|
| 68 | * @{
|
|---|
| 69 | */
|
|---|
| 70 |
|
|---|
| 71 |
|
|---|
| 72 | /** Timer handle. */
|
|---|
| 73 | typedef struct RTTIMER *PRTTIMER;
|
|---|
| 74 |
|
|---|
| 75 | /**
|
|---|
| 76 | * Timer callback function.
|
|---|
| 77 | *
|
|---|
| 78 | * The context this call is made in varies with different platforms and
|
|---|
| 79 | * kernel / user mode IPRT.
|
|---|
| 80 | *
|
|---|
| 81 | * In kernel mode a timer callback should not waste time, it shouldn't
|
|---|
| 82 | * waste stack and it should be prepared that some APIs might not work
|
|---|
| 83 | * correctly because of weird OS restrictions in this context that we
|
|---|
| 84 | * haven't discovered and avoided yet. Please fix those APIs so they
|
|---|
| 85 | * at least avoid panics and weird behaviour.
|
|---|
| 86 | *
|
|---|
| 87 | * @param pTimer Timer handle.
|
|---|
| 88 | * @param pvUser User argument.
|
|---|
| 89 | * @param iTick The current timer tick. This is always 1 on the first
|
|---|
| 90 | * callback after the timer was started. For omni timers
|
|---|
| 91 | * this will be 1 when a cpu comes back online.
|
|---|
| 92 | */
|
|---|
| 93 | typedef DECLCALLBACKTYPE(void, FNRTTIMER,(PRTTIMER pTimer, void *pvUser, uint64_t iTick));
|
|---|
| 94 | /** Pointer to FNRTTIMER() function. */
|
|---|
| 95 | typedef FNRTTIMER *PFNRTTIMER;
|
|---|
| 96 |
|
|---|
| 97 |
|
|---|
| 98 | /**
|
|---|
| 99 | * Create a recurring timer.
|
|---|
| 100 | *
|
|---|
| 101 | * @returns iprt status code.
|
|---|
| 102 | * @param ppTimer Where to store the timer handle.
|
|---|
| 103 | * @param uMilliesInterval Milliseconds between the timer ticks.
|
|---|
| 104 | * This is rounded up to the system granularity.
|
|---|
| 105 | * @param pfnTimer Callback function which shall be scheduled for execution
|
|---|
| 106 | * on every timer tick.
|
|---|
| 107 | * @param pvUser User argument for the callback.
|
|---|
| 108 | * @see RTTimerCreateEx, RTTimerStart, RTTimerStop, RTTimerChangeInterval,
|
|---|
| 109 | * RTTimerDestroy, RTTimerGetSystemGranularity
|
|---|
| 110 | */
|
|---|
| 111 | RTDECL(int) RTTimerCreate(PRTTIMER *ppTimer, unsigned uMilliesInterval, PFNRTTIMER pfnTimer, void *pvUser);
|
|---|
| 112 |
|
|---|
| 113 | /**
|
|---|
| 114 | * Create a suspended timer.
|
|---|
| 115 | *
|
|---|
| 116 | * @returns iprt status code.
|
|---|
| 117 | * @retval VERR_NOT_SUPPORTED if an unsupported flag was specfied.
|
|---|
| 118 | * @retval VERR_CPU_NOT_FOUND if the specified CPU
|
|---|
| 119 | *
|
|---|
| 120 | * @param ppTimer Where to store the timer handle.
|
|---|
| 121 | * @param u64NanoInterval The interval between timer ticks specified in nanoseconds if it's
|
|---|
| 122 | * a recurring timer. This is rounded to the fit the system timer granularity.
|
|---|
| 123 | * For one shot timers, pass 0.
|
|---|
| 124 | * @param fFlags Timer flags.
|
|---|
| 125 | * @param pfnTimer Callback function which shall be scheduled for execution
|
|---|
| 126 | * on every timer tick.
|
|---|
| 127 | * @param pvUser User argument for the callback.
|
|---|
| 128 | * @see RTTimerStart, RTTimerStop, RTTimerChangeInterval, RTTimerDestroy,
|
|---|
| 129 | * RTTimerGetSystemGranularity, RTTimerCanDoHighResolution
|
|---|
| 130 | */
|
|---|
| 131 | RTDECL(int) RTTimerCreateEx(PRTTIMER *ppTimer, uint64_t u64NanoInterval, uint32_t fFlags, PFNRTTIMER pfnTimer, void *pvUser);
|
|---|
| 132 |
|
|---|
| 133 | /** @name RTTimerCreateEx flags
|
|---|
| 134 | * @{ */
|
|---|
| 135 | /** Any CPU is fine. (Must be 0.) */
|
|---|
| 136 | #define RTTIMER_FLAGS_CPU_ANY UINT32_C(0)
|
|---|
| 137 | /** One specific CPU */
|
|---|
| 138 | #define RTTIMER_FLAGS_CPU_SPECIFIC RT_BIT(16)
|
|---|
| 139 | /** Omni timer, run on all online CPUs.
|
|---|
| 140 | * @remarks The timer callback isn't necessarily running at the time same time on each CPU. */
|
|---|
| 141 | #define RTTIMER_FLAGS_CPU_ALL ( RTTIMER_FLAGS_CPU_MASK | RTTIMER_FLAGS_CPU_SPECIFIC )
|
|---|
| 142 | /** CPU mask. */
|
|---|
| 143 | #define RTTIMER_FLAGS_CPU_MASK UINT32_C(0xffff)
|
|---|
| 144 | /** Desire a high resolution timer that works with RTTimerChangeInterval and
|
|---|
| 145 | * isn't subject to RTTimerGetSystemGranularity rounding.
|
|---|
| 146 | * @remarks This is quietly ignored if the feature isn't supported. */
|
|---|
| 147 | #define RTTIMER_FLAGS_HIGH_RES RT_BIT(17)
|
|---|
| 148 | /** Convert a CPU set index (0-based) to RTTimerCreateEx flags.
|
|---|
| 149 | * This will automatically OR in the RTTIMER_FLAGS_CPU_SPECIFIC flag. */
|
|---|
| 150 | #define RTTIMER_FLAGS_CPU(iCpu) ( (iCpu) | RTTIMER_FLAGS_CPU_SPECIFIC )
|
|---|
| 151 | /** Macro that validates the flags. */
|
|---|
| 152 | #define RTTIMER_FLAGS_ARE_VALID(fFlags) \
|
|---|
| 153 | ( !((fFlags) & ((fFlags) & RTTIMER_FLAGS_CPU_SPECIFIC ? ~UINT32_C(0x3ffff) : ~UINT32_C(0x30000))) )
|
|---|
| 154 | /** @} */
|
|---|
| 155 |
|
|---|
| 156 | /**
|
|---|
| 157 | * Stops and destroys a running timer.
|
|---|
| 158 | *
|
|---|
| 159 | * @returns iprt status code.
|
|---|
| 160 | * @retval VERR_INVALID_CONTEXT if executing at the wrong IRQL (windows), PIL
|
|---|
| 161 | * (solaris), or similar. Portable code does not destroy timers with
|
|---|
| 162 | * preemption (or interrupts) disabled.
|
|---|
| 163 | * @param pTimer Timer to stop and destroy. NULL is ok.
|
|---|
| 164 | */
|
|---|
| 165 | RTDECL(int) RTTimerDestroy(PRTTIMER pTimer);
|
|---|
| 166 |
|
|---|
| 167 | /**
|
|---|
| 168 | * Starts a suspended timer.
|
|---|
| 169 | *
|
|---|
| 170 | * @returns IPRT status code.
|
|---|
| 171 | * @retval VERR_INVALID_HANDLE if pTimer isn't valid.
|
|---|
| 172 | * @retval VERR_TIMER_ACTIVE if the timer isn't suspended.
|
|---|
| 173 | * @retval VERR_CPU_OFFLINE if the CPU the timer was created to run on is not
|
|---|
| 174 | * online (this include the case where it's not present in the
|
|---|
| 175 | * system).
|
|---|
| 176 | *
|
|---|
| 177 | * @param pTimer The timer to activate.
|
|---|
| 178 | * @param u64First The RTTimeSystemNanoTS() for when the timer should start
|
|---|
| 179 | * firing (relative). If 0 is specified, the timer will
|
|---|
| 180 | * fire ASAP.
|
|---|
| 181 | * @remarks When RTTimerCanDoHighResolution returns true, this API is
|
|---|
| 182 | * callable with preemption disabled in ring-0.
|
|---|
| 183 | * @see RTTimerStop
|
|---|
| 184 | */
|
|---|
| 185 | RTDECL(int) RTTimerStart(PRTTIMER pTimer, uint64_t u64First);
|
|---|
| 186 |
|
|---|
| 187 | /**
|
|---|
| 188 | * Stops an active timer.
|
|---|
| 189 | *
|
|---|
| 190 | * @todo May return while the timer callback function is being services on
|
|---|
| 191 | * some platforms (ring-0 Windows, ring-0 linux). This needs to be
|
|---|
| 192 | * addressed at some point...
|
|---|
| 193 | *
|
|---|
| 194 | * @returns IPRT status code.
|
|---|
| 195 | * @retval VERR_INVALID_HANDLE if pTimer isn't valid.
|
|---|
| 196 | * @retval VERR_TIMER_SUSPENDED if the timer isn't active.
|
|---|
| 197 | * @retval VERR_NOT_SUPPORTED if the IPRT implementation doesn't support
|
|---|
| 198 | * stopping a timer.
|
|---|
| 199 | *
|
|---|
| 200 | * @param pTimer The timer to suspend.
|
|---|
| 201 | * @remarks Can be called from the timer callback function to stop it.
|
|---|
| 202 | * @see RTTimerStart
|
|---|
| 203 | */
|
|---|
| 204 | RTDECL(int) RTTimerStop(PRTTIMER pTimer);
|
|---|
| 205 |
|
|---|
| 206 | /**
|
|---|
| 207 | * Changes the interval of a periodic timer.
|
|---|
| 208 | *
|
|---|
| 209 | * If the timer is active, it is implementation dependent whether the change
|
|---|
| 210 | * takes place immediately or after the next tick. To get defined behavior,
|
|---|
| 211 | * stop the timer before calling this API.
|
|---|
| 212 | *
|
|---|
| 213 | * @returns IPRT status code.
|
|---|
| 214 | * @retval VERR_INVALID_HANDLE if pTimer isn't valid.
|
|---|
| 215 | * @retval VERR_NOT_SUPPORTED if not supported.
|
|---|
| 216 | * @retval VERR_INVALID_STATE if not a periodic timer.
|
|---|
| 217 | *
|
|---|
| 218 | * @param pTimer The timer to activate.
|
|---|
| 219 | * @param u64NanoInterval The interval between timer ticks specified in
|
|---|
| 220 | * nanoseconds. This is rounded to the fit the
|
|---|
| 221 | * system timer granularity.
|
|---|
| 222 | * @remarks Callable from the timer callback. Callable with preemption
|
|---|
| 223 | * disabled in ring-0.
|
|---|
| 224 | */
|
|---|
| 225 | RTDECL(int) RTTimerChangeInterval(PRTTIMER pTimer, uint64_t u64NanoInterval);
|
|---|
| 226 |
|
|---|
| 227 | /**
|
|---|
| 228 | * Gets the (current) timer granularity of the system.
|
|---|
| 229 | *
|
|---|
| 230 | * @returns The timer granularity of the system in nanoseconds.
|
|---|
| 231 | * @see RTTimerRequestSystemGranularity
|
|---|
| 232 | */
|
|---|
| 233 | RTDECL(uint32_t) RTTimerGetSystemGranularity(void);
|
|---|
| 234 |
|
|---|
| 235 | /**
|
|---|
| 236 | * Requests a specific system timer granularity.
|
|---|
| 237 | *
|
|---|
| 238 | * Successfull calls to this API must be coupled with the exact same number of
|
|---|
| 239 | * calls to RTTimerReleaseSystemGranularity() in order to undo any changes made.
|
|---|
| 240 | *
|
|---|
| 241 | *
|
|---|
| 242 | * @returns IPRT status code.
|
|---|
| 243 | * @retval VERR_NOT_SUPPORTED if the requested value isn't supported by the host platform
|
|---|
| 244 | * or if the host platform doesn't support modifying the system timer granularity.
|
|---|
| 245 | * @retval VERR_PERMISSION_DENIED if the caller doesn't have the necessary privilege to
|
|---|
| 246 | * modify the system timer granularity.
|
|---|
| 247 | *
|
|---|
| 248 | * @param u32Request The requested system timer granularity in nanoseconds.
|
|---|
| 249 | * @param pu32Granted Where to store the granted system granularity. This is the value
|
|---|
| 250 | * that should be passed to RTTimerReleaseSystemGranularity(). It
|
|---|
| 251 | * is what RTTimerGetSystemGranularity() would return immediately
|
|---|
| 252 | * after the change was made.
|
|---|
| 253 | *
|
|---|
| 254 | * The value differ from the request in two ways; rounding and
|
|---|
| 255 | * scale. Meaning if your request is for 10.000.000 you might
|
|---|
| 256 | * be granted 10.000.055 or 1.000.000.
|
|---|
| 257 | * @see RTTimerReleaseSystemGranularity, RTTimerGetSystemGranularity
|
|---|
| 258 | */
|
|---|
| 259 | RTDECL(int) RTTimerRequestSystemGranularity(uint32_t u32Request, uint32_t *pu32Granted);
|
|---|
| 260 |
|
|---|
| 261 | /**
|
|---|
| 262 | * Releases a system timer granularity grant acquired by RTTimerRequestSystemGranularity().
|
|---|
| 263 | *
|
|---|
| 264 | * @returns IPRT status code.
|
|---|
| 265 | * @retval VERR_NOT_SUPPORTED if the host platform doesn't have any way of modifying
|
|---|
| 266 | * the system timer granularity.
|
|---|
| 267 | * @retval VERR_WRONG_ORDER if nobody call RTTimerRequestSystemGranularity() with the
|
|---|
| 268 | * given grant value.
|
|---|
| 269 | * @param u32Granted The granted system granularity.
|
|---|
| 270 | * @see RTTimerRequestSystemGranularity
|
|---|
| 271 | */
|
|---|
| 272 | RTDECL(int) RTTimerReleaseSystemGranularity(uint32_t u32Granted);
|
|---|
| 273 |
|
|---|
| 274 | /**
|
|---|
| 275 | * Checks if the system support high resolution timers.
|
|---|
| 276 | *
|
|---|
| 277 | * The kind of support we are checking for is the kind of dynamically
|
|---|
| 278 | * reprogrammable timers employed by recent Solaris and Linux kernels. It also
|
|---|
| 279 | * implies that we can specify microsecond (or even better maybe) intervals
|
|---|
| 280 | * without getting into trouble.
|
|---|
| 281 | *
|
|---|
| 282 | * @returns true if supported, false it not.
|
|---|
| 283 | *
|
|---|
| 284 | * @remarks Returning true also means RTTimerChangeInterval must be implemented
|
|---|
| 285 | * and RTTimerStart be callable with preemption disabled.
|
|---|
| 286 | */
|
|---|
| 287 | RTDECL(bool) RTTimerCanDoHighResolution(void);
|
|---|
| 288 |
|
|---|
| 289 |
|
|---|
| 290 | /**
|
|---|
| 291 | * Timer callback function for low res timers.
|
|---|
| 292 | *
|
|---|
| 293 | * This is identical to FNRTTIMER except for the first parameter, so
|
|---|
| 294 | * see FNRTTIMER for details.
|
|---|
| 295 | *
|
|---|
| 296 | * @param hTimerLR The low resolution timer handle.
|
|---|
| 297 | * @param pvUser User argument.
|
|---|
| 298 | * @param iTick The current timer tick. This is always 1 on the first
|
|---|
| 299 | * callback after the timer was started. Will jump if we've
|
|---|
| 300 | * skipped ticks when lagging behind.
|
|---|
| 301 | */
|
|---|
| 302 | typedef DECLCALLBACKTYPE(void, FNRTTIMERLR,(RTTIMERLR hTimerLR, void *pvUser, uint64_t iTick));
|
|---|
| 303 | /** Pointer to FNRTTIMER() function. */
|
|---|
| 304 | typedef FNRTTIMERLR *PFNRTTIMERLR;
|
|---|
| 305 |
|
|---|
| 306 |
|
|---|
| 307 | /**
|
|---|
| 308 | * Create a recurring low resolution timer.
|
|---|
| 309 | *
|
|---|
| 310 | * @returns iprt status code.
|
|---|
| 311 | * @param phTimerLR Where to store the timer handle.
|
|---|
| 312 | * @param uMilliesInterval Milliseconds between the timer ticks, at least 100 ms.
|
|---|
| 313 | * If higher resolution is required use the other API.
|
|---|
| 314 | * @param pfnTimer Callback function which shall be scheduled for execution
|
|---|
| 315 | * on every timer tick.
|
|---|
| 316 | * @param pvUser User argument for the callback.
|
|---|
| 317 | * @see RTTimerLRCreateEx, RTTimerLRDestroy, RTTimerLRStop
|
|---|
| 318 | */
|
|---|
| 319 | RTDECL(int) RTTimerLRCreate(PRTTIMERLR phTimerLR, uint32_t uMilliesInterval, PFNRTTIMERLR pfnTimer, void *pvUser);
|
|---|
| 320 |
|
|---|
| 321 | /**
|
|---|
| 322 | * Create a suspended low resolution timer.
|
|---|
| 323 | *
|
|---|
| 324 | * @returns iprt status code.
|
|---|
| 325 | * @retval VERR_NOT_SUPPORTED if an unsupported flag was specfied.
|
|---|
| 326 | *
|
|---|
| 327 | * @param phTimerLR Where to store the timer handle.
|
|---|
| 328 | * @param u64NanoInterval The interval between timer ticks specified in nanoseconds if it's
|
|---|
| 329 | * a recurring timer, the minimum for is 100000000 ns.
|
|---|
| 330 | * For one shot timers, pass 0.
|
|---|
| 331 | * @param fFlags Timer flags. Same as RTTimerCreateEx.
|
|---|
| 332 | * @param pfnTimer Callback function which shall be scheduled for execution
|
|---|
| 333 | * on every timer tick.
|
|---|
| 334 | * @param pvUser User argument for the callback.
|
|---|
| 335 | * @see RTTimerLRStart, RTTimerLRStop, RTTimerLRDestroy
|
|---|
| 336 | */
|
|---|
| 337 | RTDECL(int) RTTimerLRCreateEx(PRTTIMERLR phTimerLR, uint64_t u64NanoInterval, uint32_t fFlags, PFNRTTIMERLR pfnTimer, void *pvUser);
|
|---|
| 338 |
|
|---|
| 339 | /**
|
|---|
| 340 | * Stops and destroys a running low resolution timer.
|
|---|
| 341 | *
|
|---|
| 342 | * @returns iprt status code.
|
|---|
| 343 | * @param hTimerLR The low resolution timer to stop and destroy.
|
|---|
| 344 | * NIL_RTTIMERLR is accepted.
|
|---|
| 345 | */
|
|---|
| 346 | RTDECL(int) RTTimerLRDestroy(RTTIMERLR hTimerLR);
|
|---|
| 347 |
|
|---|
| 348 | /**
|
|---|
| 349 | * Starts a low resolution timer.
|
|---|
| 350 | *
|
|---|
| 351 | * @returns IPRT status code.
|
|---|
| 352 | * @retval VERR_INVALID_HANDLE if pTimer isn't valid.
|
|---|
| 353 | * @retval VERR_TIMER_ACTIVE if the timer isn't suspended.
|
|---|
| 354 | *
|
|---|
| 355 | * @param hTimerLR The low resolution timer to activate.
|
|---|
| 356 | * @param u64First The RTTimeSystemNanoTS() for when the timer should start
|
|---|
| 357 | * firing (relative), the minimum is 100000000 ns.
|
|---|
| 358 | * If 0 is specified, the timer will fire ASAP.
|
|---|
| 359 | *
|
|---|
| 360 | * @see RTTimerLRStop
|
|---|
| 361 | */
|
|---|
| 362 | RTDECL(int) RTTimerLRStart(RTTIMERLR hTimerLR, uint64_t u64First);
|
|---|
| 363 |
|
|---|
| 364 | /**
|
|---|
| 365 | * Stops an active low resolution timer.
|
|---|
| 366 | *
|
|---|
| 367 | * @returns IPRT status code.
|
|---|
| 368 | * @retval VERR_INVALID_HANDLE if pTimer isn't valid.
|
|---|
| 369 | * @retval VERR_TIMER_SUSPENDED if the timer isn't active.
|
|---|
| 370 | * @retval VERR_NOT_SUPPORTED if the IPRT implementation doesn't support stopping a timer.
|
|---|
| 371 | *
|
|---|
| 372 | * @param hTimerLR The low resolution timer to suspend.
|
|---|
| 373 | *
|
|---|
| 374 | * @see RTTimerLRStart
|
|---|
| 375 | */
|
|---|
| 376 | RTDECL(int) RTTimerLRStop(RTTIMERLR hTimerLR);
|
|---|
| 377 |
|
|---|
| 378 | /**
|
|---|
| 379 | * Changes the interval of a low resolution timer.
|
|---|
| 380 | *
|
|---|
| 381 | * If the timer is active, the next tick will occure immediately just like with
|
|---|
| 382 | * RTTimerLRStart() when u64First parameter is zero.
|
|---|
| 383 | *
|
|---|
| 384 | * @returns IPRT status code.
|
|---|
| 385 | * @retval VERR_INVALID_HANDLE if pTimer isn't valid.
|
|---|
| 386 | * @retval VERR_NOT_SUPPORTED if not supported.
|
|---|
| 387 | *
|
|---|
| 388 | * @param hTimerLR The low resolution timer to update.
|
|---|
| 389 | * @param u64NanoInterval The interval between timer ticks specified in
|
|---|
| 390 | * nanoseconds. This is rounded to the fit the
|
|---|
| 391 | * system timer granularity.
|
|---|
| 392 | * @remarks Callable from the timer callback.
|
|---|
| 393 | */
|
|---|
| 394 | RTDECL(int) RTTimerLRChangeInterval(RTTIMERLR hTimerLR, uint64_t u64NanoInterval);
|
|---|
| 395 |
|
|---|
| 396 | /** @} */
|
|---|
| 397 |
|
|---|
| 398 | RT_C_DECLS_END
|
|---|
| 399 |
|
|---|
| 400 | #endif /* !IPRT_INCLUDED_timer_h */
|
|---|
