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Diffstat (limited to '')
-rw-r--r-- | src/VBox/Runtime/os2/rtSemWaitOs2ConvertTimeout.cpp | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/src/VBox/Runtime/os2/rtSemWaitOs2ConvertTimeout.cpp b/src/VBox/Runtime/os2/rtSemWaitOs2ConvertTimeout.cpp new file mode 100644 index 00000000..7fb9d210 --- /dev/null +++ b/src/VBox/Runtime/os2/rtSemWaitOs2ConvertTimeout.cpp @@ -0,0 +1,94 @@ +/* $Id: rtSemWaitOs2ConvertTimeout.cpp $ */ +/** @file + * IPRT - RTSemEventMultiWait, implementation based on RTSemEventMultiWaitEx. + */ + +/* + * Copyright (C) 2010-2019 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 "internal/iprt.h" +#include <iprt/semaphore.h> +#include <iprt/time.h> + + +/********************************************************************************************************************************* +* Defined Constants And Macros * +*********************************************************************************************************************************/ +/** Too lazy to include the right OS/2 header, duplicating the define we + * need here. */ +#define MY_SEM_INDEFINITE_WAIT UINT32_MAX + + +/** + * Converts the timeout to a millisecond value that can be fed to KernBlock. + * + * @returns Relative timeout in milliseconds. + * @param fFlags The semaphore wait flags. + * @param uTimeout The timeout value. + */ +uint32_t rtR0SemWaitOs2ConvertTimeout(uint32_t fFlags, uint64_t uTimeout) +{ + /* + * Simple & common cases. + */ + if (fFlags & RTSEMWAIT_FLAGS_INDEFINITE) + return MY_SEM_INDEFINITE_WAIT; + + if ( (fFlags & (RTSEMWAIT_FLAGS_MILLISECS | RTSEMWAIT_FLAGS_ABSOLUTE)) + == RTSEMWAIT_FLAGS_MILLISECS) + { + if (uTimeout < UINT32_MAX) + return (uint32_t)uTimeout; + return MY_SEM_INDEFINITE_WAIT; + } + + if (!uTimeout) + return 0; + + if (uTimeout == UINT64_MAX) + return MY_SEM_INDEFINITE_WAIT; + + /* + * For the more complicated cases (nano or/and abs), convert thru nano (lazy bird). + */ + if (fFlags & RTSEMWAIT_FLAGS_MILLISECS) + { + if (uTimeout >= UINT64_MAX / RT_NS_1MS * RT_NS_1MS) + return MY_SEM_INDEFINITE_WAIT; + uTimeout = uTimeout * RT_NS_1MS; + } + if (fFlags & RTSEMWAIT_FLAGS_ABSOLUTE) + { + uint64_t u64Now = RTTimeSystemNanoTS(); + if (u64Now >= uTimeout) + return 0; + uTimeout = uTimeout - u64Now; + } + uTimeout /= RT_NS_1MS; + if (uTimeout >= UINT32_MAX) + return MY_SEM_INDEFINITE_WAIT; + return (uint32_t)uTimeout; +} + |