| 1 | /* $Id: rtSemWaitOs2ConvertTimeout.cpp 62477 2016-07-22 18:27:37Z vboxsync $ */
|
|---|
| 2 | /** @file
|
|---|
| 3 | * IPRT - RTSemEventMultiWait, implementation based on RTSemEventMultiWaitEx.
|
|---|
| 4 | */
|
|---|
| 5 |
|
|---|
| 6 | /*
|
|---|
| 7 | * Copyright (C) 2010-2016 Oracle Corporation
|
|---|
| 8 | *
|
|---|
| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
|
|---|
| 10 | * available from http://www.virtualbox.org. This file is free software;
|
|---|
| 11 | * you can redistribute it and/or modify it under the terms of the GNU
|
|---|
| 12 | * General Public License (GPL) as published by the Free Software
|
|---|
| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
|
|---|
| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
|
|---|
| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
|
|---|
| 16 | *
|
|---|
| 17 | * The contents of this file may alternatively be used under the terms
|
|---|
| 18 | * of the Common Development and Distribution License Version 1.0
|
|---|
| 19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
|
|---|
| 20 | * VirtualBox OSE distribution, in which case the provisions of the
|
|---|
| 21 | * CDDL are applicable instead of those of the GPL.
|
|---|
| 22 | *
|
|---|
| 23 | * You may elect to license modified versions of this file under the
|
|---|
| 24 | * terms and conditions of either the GPL or the CDDL or both.
|
|---|
| 25 | */
|
|---|
| 26 |
|
|---|
| 27 |
|
|---|
| 28 | /*********************************************************************************************************************************
|
|---|
| 29 | * Header Files *
|
|---|
| 30 | *********************************************************************************************************************************/
|
|---|
| 31 | #include "internal/iprt.h"
|
|---|
| 32 | #include <iprt/semaphore.h>
|
|---|
| 33 | #include <iprt/time.h>
|
|---|
| 34 |
|
|---|
| 35 |
|
|---|
| 36 | /*********************************************************************************************************************************
|
|---|
| 37 | * Defined Constants And Macros *
|
|---|
| 38 | *********************************************************************************************************************************/
|
|---|
| 39 | /** Too lazy to include the right OS/2 header, duplicating the define we
|
|---|
| 40 | * need here. */
|
|---|
| 41 | #define MY_SEM_INDEFINITE_WAIT UINT32_MAX
|
|---|
| 42 |
|
|---|
| 43 |
|
|---|
| 44 | /**
|
|---|
| 45 | * Converts the timeout to a millisecond value that can be fed to KernBlock.
|
|---|
| 46 | *
|
|---|
| 47 | * @returns Relative timeout in milliseconds.
|
|---|
| 48 | * @param fFlags The semaphore wait flags.
|
|---|
| 49 | * @param uTimeout The timeout value.
|
|---|
| 50 | */
|
|---|
| 51 | uint32_t rtR0SemWaitOs2ConvertTimeout(uint32_t fFlags, uint64_t uTimeout)
|
|---|
| 52 | {
|
|---|
| 53 | /*
|
|---|
| 54 | * Simple & common cases.
|
|---|
| 55 | */
|
|---|
| 56 | if (fFlags & RTSEMWAIT_FLAGS_INDEFINITE)
|
|---|
| 57 | return MY_SEM_INDEFINITE_WAIT;
|
|---|
| 58 |
|
|---|
| 59 | if ( (fFlags & (RTSEMWAIT_FLAGS_MILLISECS | RTSEMWAIT_FLAGS_ABSOLUTE))
|
|---|
| 60 | == RTSEMWAIT_FLAGS_MILLISECS)
|
|---|
| 61 | {
|
|---|
| 62 | if (uTimeout < UINT32_MAX)
|
|---|
| 63 | return (uint32_t)uTimeout;
|
|---|
| 64 | return MY_SEM_INDEFINITE_WAIT;
|
|---|
| 65 | }
|
|---|
| 66 |
|
|---|
| 67 | if (!uTimeout)
|
|---|
| 68 | return 0;
|
|---|
| 69 |
|
|---|
| 70 | if (uTimeout == UINT64_MAX)
|
|---|
| 71 | return MY_SEM_INDEFINITE_WAIT;
|
|---|
| 72 |
|
|---|
| 73 | /*
|
|---|
| 74 | * For the more complicated cases (nano or/and abs), convert thru nano (lazy bird).
|
|---|
| 75 | */
|
|---|
| 76 | if (fFlags & RTSEMWAIT_FLAGS_MILLISECS)
|
|---|
| 77 | {
|
|---|
| 78 | if (uTimeout >= UINT64_MAX / RT_NS_1MS * RT_NS_1MS)
|
|---|
| 79 | return MY_SEM_INDEFINITE_WAIT;
|
|---|
| 80 | uTimeout = uTimeout * RT_NS_1MS;
|
|---|
| 81 | }
|
|---|
| 82 | if (fFlags & RTSEMWAIT_FLAGS_ABSOLUTE)
|
|---|
| 83 | {
|
|---|
| 84 | uint64_t u64Now = RTTimeSystemNanoTS();
|
|---|
| 85 | if (u64Now >= uTimeout)
|
|---|
| 86 | return 0;
|
|---|
| 87 | uTimeout = uTimeout - u64Now;
|
|---|
| 88 | }
|
|---|
| 89 | uTimeout /= RT_NS_1MS;
|
|---|
| 90 | if (uTimeout >= UINT32_MAX)
|
|---|
| 91 | return MY_SEM_INDEFINITE_WAIT;
|
|---|
| 92 | return (uint32_t)uTimeout;
|
|---|
| 93 | }
|
|---|
| 94 |
|
|---|
