diff options
Diffstat (limited to 'src/VBox/Runtime/r0drv/nt/timer-r0drv-nt.cpp')
| -rw-r--r-- | src/VBox/Runtime/r0drv/nt/timer-r0drv-nt.cpp | 597 |
1 files changed, 597 insertions, 0 deletions
diff --git a/src/VBox/Runtime/r0drv/nt/timer-r0drv-nt.cpp b/src/VBox/Runtime/r0drv/nt/timer-r0drv-nt.cpp new file mode 100644 index 00000000..001123bc --- /dev/null +++ b/src/VBox/Runtime/r0drv/nt/timer-r0drv-nt.cpp @@ -0,0 +1,597 @@ +/* $Id: timer-r0drv-nt.cpp $ */ +/** @file + * IPRT - Timers, Ring-0 Driver, NT. + */ + +/* + * 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 "the-nt-kernel.h" + +#include <iprt/timer.h> +#include <iprt/mp.h> +#include <iprt/cpuset.h> +#include <iprt/err.h> +#include <iprt/asm.h> +#include <iprt/assert.h> +#include <iprt/mem.h> +#include <iprt/thread.h> + +#include "internal-r0drv-nt.h" +#include "internal/magics.h" + +/** This seems to provide better accuracy. */ +#define RTR0TIMER_NT_MANUAL_RE_ARM 1 + + +/********************************************************************************************************************************* +* Structures and Typedefs * +*********************************************************************************************************************************/ +/** + * A sub timer structure. + * + * This is used for keeping the per-cpu tick and DPC object. + */ +typedef struct RTTIMERNTSUBTIMER +{ + /** The tick counter. */ + uint64_t iTick; + /** Pointer to the parent timer. */ + PRTTIMER pParent; + /** Thread active executing the worker function, NIL if inactive. */ + RTNATIVETHREAD volatile hActiveThread; + /** The NT DPC object. */ + KDPC NtDpc; +} RTTIMERNTSUBTIMER; +/** Pointer to a NT sub-timer structure. */ +typedef RTTIMERNTSUBTIMER *PRTTIMERNTSUBTIMER; + +/** + * The internal representation of an Linux 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; + /** Suspend count down for single shot omnit timers. */ + int32_t volatile cOmniSuspendCountDown; + /** Flag indicating the timer is suspended. */ + bool volatile fSuspended; + /** Whether the timer must run on one specific CPU or not. */ + bool fSpecificCpu; + /** Whether the timer must run on all CPUs or not. */ + bool fOmniTimer; + /** The CPU it must run on if fSpecificCpu is set. + * The master CPU for an omni-timer. */ + RTCPUID idCpu; + /** Callback. */ + PFNRTTIMER pfnTimer; + /** User argument. */ + void *pvUser; + /** The timer interval. 0 if one-shot. */ + uint64_t u64NanoInterval; +#ifdef RTR0TIMER_NT_MANUAL_RE_ARM + /** The desired NT time of the first tick. */ + uint64_t uNtStartTime; +#endif + /** The Nt timer object. */ + KTIMER NtTimer; + /** The number of sub-timers. */ + RTCPUID cSubTimers; + /** Sub-timers. + * Normally there is just one, but for RTTIMER_FLAGS_CPU_ALL this will contain + * an entry for all possible cpus. In that case the index will be the same as + * for the RTCpuSet. */ + RTTIMERNTSUBTIMER aSubTimers[1]; +} RTTIMER; + + +#ifdef RTR0TIMER_NT_MANUAL_RE_ARM +/** + * Get current NT interrupt time. + * @return NT interrupt time + */ +static uint64_t rtTimerNtQueryInterruptTime(void) +{ +# ifdef RT_ARCH_AMD64 + return KeQueryInterruptTime(); /* macro */ +# else + if (g_pfnrtKeQueryInterruptTime) + return g_pfnrtKeQueryInterruptTime(); + + /* NT4 */ + ULARGE_INTEGER InterruptTime; + do + { + InterruptTime.HighPart = ((KUSER_SHARED_DATA volatile *)SharedUserData)->InterruptTime.High1Time; + InterruptTime.LowPart = ((KUSER_SHARED_DATA volatile *)SharedUserData)->InterruptTime.LowPart; + } while (((KUSER_SHARED_DATA volatile *)SharedUserData)->InterruptTime.High2Time != (LONG)InterruptTime.HighPart); + return InterruptTime.QuadPart; +# endif +} +#endif /* RTR0TIMER_NT_MANUAL_RE_ARM */ + + +/** + * Manually re-arms an internval timer. + * + * Turns out NT doesn't necessarily do a very good job at re-arming timers + * accurately. + * + * @param pTimer The timer. + * @param iTick The current timer tick. + * @param pMasterDpc The master DPC. + */ +DECLINLINE(void) rtTimerNtRearmInternval(PRTTIMER pTimer, uint64_t iTick, PKDPC pMasterDpc) +{ +#ifdef RTR0TIMER_NT_MANUAL_RE_ARM + Assert(pTimer->u64NanoInterval); + RT_NOREF1(pMasterDpc); + + uint64_t uNtNext = (iTick * pTimer->u64NanoInterval) / 100 - 10; /* 1us fudge */ + LARGE_INTEGER DueTime; + DueTime.QuadPart = rtTimerNtQueryInterruptTime() - pTimer->uNtStartTime; + if (DueTime.QuadPart < 0) + DueTime.QuadPart = 0; + if ((uint64_t)DueTime.QuadPart < uNtNext) + DueTime.QuadPart -= uNtNext; + else + DueTime.QuadPart = -2500; /* 0.25ms */ + + KeSetTimerEx(&pTimer->NtTimer, DueTime, 0, &pTimer->aSubTimers[0].NtDpc); +#else + RT_NOREF3(pTimer, iTick, pMasterDpc); +#endif +} + + +/** + * Timer callback function for the non-omni timers. + * + * @returns HRTIMER_NORESTART or HRTIMER_RESTART depending on whether it's a one-shot or interval timer. + * @param pDpc Pointer to the DPC. + * @param pvUser Pointer to our internal timer structure. + * @param SystemArgument1 Some system argument. + * @param SystemArgument2 Some system argument. + */ +static void _stdcall rtTimerNtSimpleCallback(IN PKDPC pDpc, IN PVOID pvUser, IN PVOID SystemArgument1, IN PVOID SystemArgument2) +{ + PRTTIMER pTimer = (PRTTIMER)pvUser; + AssertPtr(pTimer); +#ifdef RT_STRICT + if (KeGetCurrentIrql() < DISPATCH_LEVEL) + RTAssertMsg2Weak("rtTimerNtSimpleCallback: Irql=%d expected >=%d\n", KeGetCurrentIrql(), DISPATCH_LEVEL); +#endif + + /* + * Check that we haven't been suspended before doing the callout. + */ + if ( !ASMAtomicUoReadBool(&pTimer->fSuspended) + && pTimer->u32Magic == RTTIMER_MAGIC) + { + ASMAtomicWriteHandle(&pTimer->aSubTimers[0].hActiveThread, RTThreadNativeSelf()); + + if (!pTimer->u64NanoInterval) + ASMAtomicWriteBool(&pTimer->fSuspended, true); + uint64_t iTick = ++pTimer->aSubTimers[0].iTick; + if (pTimer->u64NanoInterval) + rtTimerNtRearmInternval(pTimer, iTick, &pTimer->aSubTimers[0].NtDpc); + pTimer->pfnTimer(pTimer, pTimer->pvUser, iTick); + + ASMAtomicWriteHandle(&pTimer->aSubTimers[0].hActiveThread, NIL_RTNATIVETHREAD); + } + + NOREF(pDpc); NOREF(SystemArgument1); NOREF(SystemArgument2); +} + + +/** + * The slave DPC callback for an omni timer. + * + * @param pDpc The DPC object. + * @param pvUser Pointer to the sub-timer. + * @param SystemArgument1 Some system stuff. + * @param SystemArgument2 Some system stuff. + */ +static void _stdcall rtTimerNtOmniSlaveCallback(IN PKDPC pDpc, IN PVOID pvUser, IN PVOID SystemArgument1, IN PVOID SystemArgument2) +{ + PRTTIMERNTSUBTIMER pSubTimer = (PRTTIMERNTSUBTIMER)pvUser; + PRTTIMER pTimer = pSubTimer->pParent; + + AssertPtr(pTimer); +#ifdef RT_STRICT + if (KeGetCurrentIrql() < DISPATCH_LEVEL) + RTAssertMsg2Weak("rtTimerNtOmniSlaveCallback: Irql=%d expected >=%d\n", KeGetCurrentIrql(), DISPATCH_LEVEL); + int iCpuSelf = RTMpCpuIdToSetIndex(RTMpCpuId()); + if (pSubTimer - &pTimer->aSubTimers[0] != iCpuSelf) + RTAssertMsg2Weak("rtTimerNtOmniSlaveCallback: iCpuSelf=%d pSubTimer=%p / %d\n", iCpuSelf, pSubTimer, pSubTimer - &pTimer->aSubTimers[0]); +#endif + + /* + * Check that we haven't been suspended before doing the callout. + */ + if ( !ASMAtomicUoReadBool(&pTimer->fSuspended) + && pTimer->u32Magic == RTTIMER_MAGIC) + { + ASMAtomicWriteHandle(&pSubTimer->hActiveThread, RTThreadNativeSelf()); + + if (!pTimer->u64NanoInterval) + if (ASMAtomicDecS32(&pTimer->cOmniSuspendCountDown) <= 0) + ASMAtomicWriteBool(&pTimer->fSuspended, true); + + pTimer->pfnTimer(pTimer, pTimer->pvUser, ++pSubTimer->iTick); + + ASMAtomicWriteHandle(&pSubTimer->hActiveThread, NIL_RTNATIVETHREAD); + } + + NOREF(pDpc); NOREF(SystemArgument1); NOREF(SystemArgument2); +} + + +/** + * The timer callback for an omni-timer. + * + * This is responsible for queueing the DPCs for the other CPUs and + * perform the callback on the CPU on which it is called. + * + * @param pDpc The DPC object. + * @param pvUser Pointer to the sub-timer. + * @param SystemArgument1 Some system stuff. + * @param SystemArgument2 Some system stuff. + */ +static void _stdcall rtTimerNtOmniMasterCallback(IN PKDPC pDpc, IN PVOID pvUser, IN PVOID SystemArgument1, IN PVOID SystemArgument2) +{ + PRTTIMERNTSUBTIMER pSubTimer = (PRTTIMERNTSUBTIMER)pvUser; + PRTTIMER pTimer = pSubTimer->pParent; + int iCpuSelf = RTMpCpuIdToSetIndex(RTMpCpuId()); + + AssertPtr(pTimer); +#ifdef RT_STRICT + if (KeGetCurrentIrql() < DISPATCH_LEVEL) + RTAssertMsg2Weak("rtTimerNtOmniMasterCallback: Irql=%d expected >=%d\n", KeGetCurrentIrql(), DISPATCH_LEVEL); + if (pSubTimer - &pTimer->aSubTimers[0] != iCpuSelf) + RTAssertMsg2Weak("rtTimerNtOmniMasterCallback: iCpuSelf=%d pSubTimer=%p / %d\n", iCpuSelf, pSubTimer, pSubTimer - &pTimer->aSubTimers[0]); +#endif + + /* + * Check that we haven't been suspended before scheduling the other DPCs + * and doing the callout. + */ + if ( !ASMAtomicUoReadBool(&pTimer->fSuspended) + && pTimer->u32Magic == RTTIMER_MAGIC) + { + RTCPUSET OnlineSet; + RTMpGetOnlineSet(&OnlineSet); + + ASMAtomicWriteHandle(&pSubTimer->hActiveThread, RTThreadNativeSelf()); + + if (pTimer->u64NanoInterval) + { + /* + * Recurring timer. + */ + for (int iCpu = 0; iCpu < RTCPUSET_MAX_CPUS; iCpu++) + if ( RTCpuSetIsMemberByIndex(&OnlineSet, iCpu) + && iCpuSelf != iCpu) + KeInsertQueueDpc(&pTimer->aSubTimers[iCpu].NtDpc, 0, 0); + + uint64_t iTick = ++pSubTimer->iTick; + rtTimerNtRearmInternval(pTimer, iTick, &pTimer->aSubTimers[RTMpCpuIdToSetIndex(pTimer->idCpu)].NtDpc); + pTimer->pfnTimer(pTimer, pTimer->pvUser, iTick); + } + else + { + /* + * Single shot timers gets complicated wrt to fSuspended maintance. + */ + uint32_t cCpus = 0; + for (int iCpu = 0; iCpu < RTCPUSET_MAX_CPUS; iCpu++) + if (RTCpuSetIsMemberByIndex(&OnlineSet, iCpu)) + cCpus++; + ASMAtomicAddS32(&pTimer->cOmniSuspendCountDown, cCpus); + + for (int iCpu = 0; iCpu < RTCPUSET_MAX_CPUS; iCpu++) + if ( RTCpuSetIsMemberByIndex(&OnlineSet, iCpu) + && iCpuSelf != iCpu) + if (!KeInsertQueueDpc(&pTimer->aSubTimers[iCpu].NtDpc, 0, 0)) + ASMAtomicDecS32(&pTimer->cOmniSuspendCountDown); /* already queued and counted. */ + + if (ASMAtomicDecS32(&pTimer->cOmniSuspendCountDown) <= 0) + ASMAtomicWriteBool(&pTimer->fSuspended, true); + + pTimer->pfnTimer(pTimer, pTimer->pvUser, ++pSubTimer->iTick); + } + + ASMAtomicWriteHandle(&pSubTimer->hActiveThread, NIL_RTNATIVETHREAD); + } + + NOREF(pDpc); NOREF(SystemArgument1); NOREF(SystemArgument2); +} + + + +RTDECL(int) RTTimerStart(PRTTIMER pTimer, uint64_t u64First) +{ + /* + * Validate. + */ + AssertPtrReturn(pTimer, VERR_INVALID_HANDLE); + AssertReturn(pTimer->u32Magic == RTTIMER_MAGIC, VERR_INVALID_HANDLE); + + if (!ASMAtomicUoReadBool(&pTimer->fSuspended)) + return VERR_TIMER_ACTIVE; + if ( pTimer->fSpecificCpu + && !RTMpIsCpuOnline(pTimer->idCpu)) + return VERR_CPU_OFFLINE; + + /* + * Start the timer. + */ + PKDPC pMasterDpc = pTimer->fOmniTimer + ? &pTimer->aSubTimers[RTMpCpuIdToSetIndex(pTimer->idCpu)].NtDpc + : &pTimer->aSubTimers[0].NtDpc; + +#ifndef RTR0TIMER_NT_MANUAL_RE_ARM + uint64_t u64Interval = pTimer->u64NanoInterval / 1000000; /* This is ms, believe it or not. */ + ULONG ulInterval = (ULONG)u64Interval; + if (ulInterval != u64Interval) + ulInterval = MAXLONG; + else if (!ulInterval && pTimer->u64NanoInterval) + ulInterval = 1; +#endif + + LARGE_INTEGER DueTime; + DueTime.QuadPart = -(int64_t)(u64First / 100); /* Relative, NT time. */ + if (!DueTime.QuadPart) + DueTime.QuadPart = -1; + + unsigned cSubTimers = pTimer->fOmniTimer ? pTimer->cSubTimers : 1; + for (unsigned iCpu = 0; iCpu < cSubTimers; iCpu++) + pTimer->aSubTimers[iCpu].iTick = 0; + ASMAtomicWriteS32(&pTimer->cOmniSuspendCountDown, 0); + ASMAtomicWriteBool(&pTimer->fSuspended, false); +#ifdef RTR0TIMER_NT_MANUAL_RE_ARM + pTimer->uNtStartTime = rtTimerNtQueryInterruptTime() + u64First / 100; + KeSetTimerEx(&pTimer->NtTimer, DueTime, 0, pMasterDpc); +#else + KeSetTimerEx(&pTimer->NtTimer, DueTime, ulInterval, pMasterDpc); +#endif + return VINF_SUCCESS; +} + + +/** + * Worker function that stops an active timer. + * + * Shared by RTTimerStop and RTTimerDestroy. + * + * @param pTimer The active timer. + */ +static void rtTimerNtStopWorker(PRTTIMER pTimer) +{ + /* + * Just cancel the timer, dequeue the DPCs and flush them (if this is supported). + */ + ASMAtomicWriteBool(&pTimer->fSuspended, true); + + KeCancelTimer(&pTimer->NtTimer); + + for (RTCPUID iCpu = 0; iCpu < pTimer->cSubTimers; iCpu++) + KeRemoveQueueDpc(&pTimer->aSubTimers[iCpu].NtDpc); +} + + +RTDECL(int) RTTimerStop(PRTTIMER pTimer) +{ + /* + * Validate. + */ + AssertPtrReturn(pTimer, VERR_INVALID_HANDLE); + AssertReturn(pTimer->u32Magic == RTTIMER_MAGIC, VERR_INVALID_HANDLE); + + if (ASMAtomicUoReadBool(&pTimer->fSuspended)) + return VERR_TIMER_SUSPENDED; + + /* + * Call the worker we share with RTTimerDestroy. + */ + rtTimerNtStopWorker(pTimer); + return VINF_SUCCESS; +} + + +RTDECL(int) RTTimerChangeInterval(PRTTIMER pTimer, uint64_t u64NanoInterval) +{ + AssertPtrReturn(pTimer, VERR_INVALID_HANDLE); + AssertReturn(pTimer->u32Magic == RTTIMER_MAGIC, VERR_INVALID_HANDLE); + RT_NOREF1(u64NanoInterval); + + return VERR_NOT_SUPPORTED; +} + + +RTDECL(int) RTTimerDestroy(PRTTIMER pTimer) +{ + /* It's ok to pass NULL pointer. */ + if (pTimer == /*NIL_RTTIMER*/ NULL) + return VINF_SUCCESS; + AssertPtrReturn(pTimer, VERR_INVALID_HANDLE); + AssertReturn(pTimer->u32Magic == RTTIMER_MAGIC, VERR_INVALID_HANDLE); + + /* + * We do not support destroying a timer from the callback because it is + * not 101% safe since we cannot flush DPCs. Solaris has the same restriction. + */ + AssertReturn(KeGetCurrentIrql() == PASSIVE_LEVEL, VERR_INVALID_CONTEXT); + + /* + * Invalidate the timer, stop it if it's running and finally + * free up the memory. + */ + ASMAtomicWriteU32(&pTimer->u32Magic, ~RTTIMER_MAGIC); + if (!ASMAtomicUoReadBool(&pTimer->fSuspended)) + rtTimerNtStopWorker(pTimer); + + /* + * Flush DPCs to be on the safe side. + */ + if (g_pfnrtNtKeFlushQueuedDpcs) + g_pfnrtNtKeFlushQueuedDpcs(); + + RTMemFree(pTimer); + + return VINF_SUCCESS; +} + + +RTDECL(int) RTTimerCreateEx(PRTTIMER *ppTimer, uint64_t u64NanoInterval, uint32_t fFlags, PFNRTTIMER pfnTimer, void *pvUser) +{ + *ppTimer = NULL; + + /* + * Validate flags. + */ + if (!RTTIMER_FLAGS_ARE_VALID(fFlags)) + return VERR_INVALID_PARAMETER; + if ( (fFlags & RTTIMER_FLAGS_CPU_SPECIFIC) + && (fFlags & RTTIMER_FLAGS_CPU_ALL) != RTTIMER_FLAGS_CPU_ALL + && !RTMpIsCpuPossible(RTMpCpuIdFromSetIndex(fFlags & RTTIMER_FLAGS_CPU_MASK))) + return VERR_CPU_NOT_FOUND; + + /* + * Allocate the timer handler. + */ + RTCPUID cSubTimers = 1; + if ((fFlags & RTTIMER_FLAGS_CPU_ALL) == RTTIMER_FLAGS_CPU_ALL) + { + cSubTimers = RTMpGetMaxCpuId() + 1; + Assert(cSubTimers <= RTCPUSET_MAX_CPUS); /* On Windows we have a 1:1 relationship between cpuid and set index. */ + } + + PRTTIMER pTimer = (PRTTIMER)RTMemAllocZ(RT_UOFFSETOF_DYN(RTTIMER, aSubTimers[cSubTimers])); + if (!pTimer) + return VERR_NO_MEMORY; + + /* + * Initialize it. + */ + pTimer->u32Magic = RTTIMER_MAGIC; + pTimer->cOmniSuspendCountDown = 0; + pTimer->fSuspended = true; + pTimer->fSpecificCpu = (fFlags & RTTIMER_FLAGS_CPU_SPECIFIC) && (fFlags & RTTIMER_FLAGS_CPU_ALL) != RTTIMER_FLAGS_CPU_ALL; + pTimer->fOmniTimer = (fFlags & RTTIMER_FLAGS_CPU_ALL) == RTTIMER_FLAGS_CPU_ALL; + pTimer->idCpu = pTimer->fSpecificCpu ? RTMpCpuIdFromSetIndex(fFlags & RTTIMER_FLAGS_CPU_MASK) : NIL_RTCPUID; + pTimer->cSubTimers = cSubTimers; + pTimer->pfnTimer = pfnTimer; + pTimer->pvUser = pvUser; + pTimer->u64NanoInterval = u64NanoInterval; + if (g_pfnrtKeInitializeTimerEx) + g_pfnrtKeInitializeTimerEx(&pTimer->NtTimer, SynchronizationTimer); + else + KeInitializeTimer(&pTimer->NtTimer); + int rc = VINF_SUCCESS; + if (pTimer->fOmniTimer) + { + /* + * Initialize the per-cpu "sub-timers", select the first online cpu + * to be the master. + * ASSUMES that no cpus will ever go offline. + */ + pTimer->idCpu = NIL_RTCPUID; + for (unsigned iCpu = 0; iCpu < cSubTimers && RT_SUCCESS(rc); iCpu++) + { + pTimer->aSubTimers[iCpu].iTick = 0; + pTimer->aSubTimers[iCpu].pParent = pTimer; + + if ( pTimer->idCpu == NIL_RTCPUID + && RTMpIsCpuOnline(RTMpCpuIdFromSetIndex(iCpu))) + { + pTimer->idCpu = RTMpCpuIdFromSetIndex(iCpu); + KeInitializeDpc(&pTimer->aSubTimers[iCpu].NtDpc, rtTimerNtOmniMasterCallback, &pTimer->aSubTimers[iCpu]); + } + else + KeInitializeDpc(&pTimer->aSubTimers[iCpu].NtDpc, rtTimerNtOmniSlaveCallback, &pTimer->aSubTimers[iCpu]); + if (g_pfnrtKeSetImportanceDpc) + g_pfnrtKeSetImportanceDpc(&pTimer->aSubTimers[iCpu].NtDpc, HighImportance); + rc = rtMpNtSetTargetProcessorDpc(&pTimer->aSubTimers[iCpu].NtDpc, iCpu); + } + Assert(pTimer->idCpu != NIL_RTCPUID); + } + else + { + /* + * Initialize the first "sub-timer", target the DPC on a specific processor + * if requested to do so. + */ + pTimer->aSubTimers[0].iTick = 0; + pTimer->aSubTimers[0].pParent = pTimer; + + KeInitializeDpc(&pTimer->aSubTimers[0].NtDpc, rtTimerNtSimpleCallback, pTimer); + if (g_pfnrtKeSetImportanceDpc) + g_pfnrtKeSetImportanceDpc(&pTimer->aSubTimers[0].NtDpc, HighImportance); + if (pTimer->fSpecificCpu) + rc = rtMpNtSetTargetProcessorDpc(&pTimer->aSubTimers[0].NtDpc, (int)pTimer->idCpu); + } + if (RT_SUCCESS(rc)) + { + *ppTimer = pTimer; + return VINF_SUCCESS; + } + + RTMemFree(pTimer); + return rc; +} + + +RTDECL(int) RTTimerRequestSystemGranularity(uint32_t u32Request, uint32_t *pu32Granted) +{ + if (!g_pfnrtNtExSetTimerResolution) + return VERR_NOT_SUPPORTED; + + ULONG ulGranted = g_pfnrtNtExSetTimerResolution(u32Request / 100, TRUE); + if (pu32Granted) + *pu32Granted = ulGranted * 100; /* NT -> ns */ + return VINF_SUCCESS; +} + + +RTDECL(int) RTTimerReleaseSystemGranularity(uint32_t u32Granted) +{ + if (!g_pfnrtNtExSetTimerResolution) + return VERR_NOT_SUPPORTED; + + g_pfnrtNtExSetTimerResolution(0 /* ignored */, FALSE); + NOREF(u32Granted); + return VINF_SUCCESS; +} + + +RTDECL(bool) RTTimerCanDoHighResolution(void) +{ + return false; +} + |