VirtualBox

source: vbox/trunk/src/VBox/Runtime/os2/rtSemWaitOs2ConvertTimeout.cpp@ 103914

Last change on this file since 103914 was 98103, checked in by vboxsync, 23 months ago

Copyright year updates by scm.

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File size: 3.7 KB
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1/* $Id: rtSemWaitOs2ConvertTimeout.cpp 98103 2023-01-17 14:15:46Z vboxsync $ */
2/** @file
3 * IPRT - RTSemEventMultiWait, implementation based on RTSemEventMultiWaitEx.
4 */
5
6/*
7 * Copyright (C) 2010-2023 Oracle and/or its affiliates.
8 *
9 * This file is part of VirtualBox base platform packages, as
10 * available from https://www.virtualbox.org.
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation, in version 3 of the
15 * License.
16 *
17 * This program is distributed in the hope that it will be useful, but
18 * WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 * General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, see <https://www.gnu.org/licenses>.
24 *
25 * The contents of this file may alternatively be used under the terms
26 * of the Common Development and Distribution License Version 1.0
27 * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
28 * in the VirtualBox distribution, in which case the provisions of the
29 * CDDL are applicable instead of those of the GPL.
30 *
31 * You may elect to license modified versions of this file under the
32 * terms and conditions of either the GPL or the CDDL or both.
33 *
34 * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
35 */
36
37
38/*********************************************************************************************************************************
39* Header Files *
40*********************************************************************************************************************************/
41#include "internal/iprt.h"
42#include <iprt/semaphore.h>
43#include <iprt/time.h>
44
45
46/*********************************************************************************************************************************
47* Defined Constants And Macros *
48*********************************************************************************************************************************/
49/** Too lazy to include the right OS/2 header, duplicating the define we
50 * need here. */
51#define MY_SEM_INDEFINITE_WAIT UINT32_MAX
52
53
54/**
55 * Converts the timeout to a millisecond value that can be fed to KernBlock.
56 *
57 * @returns Relative timeout in milliseconds.
58 * @param fFlags The semaphore wait flags.
59 * @param uTimeout The timeout value.
60 */
61uint32_t rtR0SemWaitOs2ConvertTimeout(uint32_t fFlags, uint64_t uTimeout)
62{
63 /*
64 * Simple & common cases.
65 */
66 if (fFlags & RTSEMWAIT_FLAGS_INDEFINITE)
67 return MY_SEM_INDEFINITE_WAIT;
68
69 if ( (fFlags & (RTSEMWAIT_FLAGS_MILLISECS | RTSEMWAIT_FLAGS_ABSOLUTE))
70 == RTSEMWAIT_FLAGS_MILLISECS)
71 {
72 if (uTimeout < UINT32_MAX)
73 return (uint32_t)uTimeout;
74 return MY_SEM_INDEFINITE_WAIT;
75 }
76
77 if (!uTimeout)
78 return 0;
79
80 if (uTimeout == UINT64_MAX)
81 return MY_SEM_INDEFINITE_WAIT;
82
83 /*
84 * For the more complicated cases (nano or/and abs), convert thru nano (lazy bird).
85 */
86 if (fFlags & RTSEMWAIT_FLAGS_MILLISECS)
87 {
88 if (uTimeout >= UINT64_MAX / RT_NS_1MS * RT_NS_1MS)
89 return MY_SEM_INDEFINITE_WAIT;
90 uTimeout = uTimeout * RT_NS_1MS;
91 }
92 if (fFlags & RTSEMWAIT_FLAGS_ABSOLUTE)
93 {
94 uint64_t u64Now = RTTimeSystemNanoTS();
95 if (u64Now >= uTimeout)
96 return 0;
97 uTimeout = uTimeout - u64Now;
98 }
99 uTimeout /= RT_NS_1MS;
100 if (uTimeout >= UINT32_MAX)
101 return MY_SEM_INDEFINITE_WAIT;
102 return (uint32_t)uTimeout;
103}
104
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