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/* $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;
}
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