| 1 | /* $Id: rtSemWaitOs2ConvertTimeout.cpp 44529 2013-02-04 15:54:15Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - RTSemEventMultiWait, implementation based on RTSemEventMultiWaitEx.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2010-2012 Oracle Corporation
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | *
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| 17 | * The contents of this file may alternatively be used under the terms
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| 18 | * of the Common Development and Distribution License Version 1.0
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| 19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 20 | * VirtualBox OSE distribution, in which case the provisions of the
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| 21 | * CDDL are applicable instead of those of the GPL.
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| 22 | *
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| 23 | * You may elect to license modified versions of this file under the
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| 24 | * terms and conditions of either the GPL or the CDDL or both.
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| 25 | */
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| 26 |
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| 27 |
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| 28 | /*******************************************************************************
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| 29 | * Header Files *
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| 30 | *******************************************************************************/
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| 31 | #include "internal/iprt.h"
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| 32 | #include <iprt/semaphore.h>
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| 33 | #include <iprt/time.h>
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| 34 |
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| 35 |
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| 36 | /*******************************************************************************
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| 37 | * Defined Constants And Macros *
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| 38 | *******************************************************************************/
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| 39 | /** Too lazy to include the right OS/2 header, duplicating the define we
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| 40 | * need here. */
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| 41 | #define MY_SEM_INDEFINITE_WAIT UINT32_MAX
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| 42 |
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| 43 |
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| 44 | /**
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| 45 | * Converts the timeout to a millisecond value that can be fed to KernBlock.
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| 46 | *
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| 47 | * @returns Relative timeout in milliseconds.
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| 48 | * @param fFlags The semaphore wait flags.
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| 49 | * @param uTimeout The timeout value.
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| 50 | */
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| 51 | uint32_t rtR0SemWaitOs2ConvertTimeout(uint32_t fFlags, uint64_t uTimeout)
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| 52 | {
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| 53 | /*
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| 54 | * Simple & common cases.
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| 55 | */
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| 56 | if (fFlags & RTSEMWAIT_FLAGS_INDEFINITE)
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| 57 | return MY_SEM_INDEFINITE_WAIT;
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| 58 |
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| 59 | if ( (fFlags & (RTSEMWAIT_FLAGS_MILLISECS | RTSEMWAIT_FLAGS_ABSOLUTE))
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| 60 | == RTSEMWAIT_FLAGS_MILLISECS)
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| 61 | {
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| 62 | if (uTimeout < UINT32_MAX)
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| 63 | return (uint32_t)uTimeout;
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| 64 | return MY_SEM_INDEFINITE_WAIT;
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| 65 | }
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| 66 |
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| 67 | if (!uTimeout)
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| 68 | return 0;
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| 69 |
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| 70 | if (uTimeout == UINT64_MAX)
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| 71 | return MY_SEM_INDEFINITE_WAIT;
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| 72 |
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| 73 | /*
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| 74 | * For the more complicated cases (nano or/and abs), convert thru nano (lazy bird).
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| 75 | */
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| 76 | if (fFlags & RTSEMWAIT_FLAGS_MILLISECS)
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| 77 | {
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| 78 | if (uTimeout >= UINT64_MAX / RT_NS_1MS * RT_NS_1MS)
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| 79 | return MY_SEM_INDEFINITE_WAIT;
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| 80 | uTimeout = uTimeout * RT_NS_1MS;
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| 81 | }
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| 82 | if (fFlags & RTSEMWAIT_FLAGS_ABSOLUTE)
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| 83 | {
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| 84 | uint64_t u64Now = RTTimeSystemNanoTS();
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| 85 | if (u64Now >= uTimeout)
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| 86 | return 0;
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| 87 | uTimeout = uTimeout - u64Now;
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| 88 | }
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| 89 | uTimeout /= RT_NS_1MS;
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| 90 | if (uTimeout >= UINT32_MAX)
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| 91 | return MY_SEM_INDEFINITE_WAIT;
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| 92 | return (uint32_t)uTimeout;
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| 93 | }
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| 94 |
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