Current File : //usr/src/vboxhost-6.0.14/vboxdrv/r0drv/linux/thread2-r0drv-linux.c
/* $Id: thread2-r0drv-linux.c 127855 2019-01-01 01:45:53Z bird $ */
/** @file
* IPRT - Threads (Part 2), Ring-0 Driver, Linux.
*/
/*
* Copyright (C) 2006-2019 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 "the-linux-kernel.h"
#include "internal/iprt.h"
#include <iprt/assert.h>
#include <iprt/thread.h>
#include <iprt/errcore.h>
#include "internal/thread.h"
RTDECL(RTTHREAD) RTThreadSelf(void)
{
return rtThreadGetByNative((RTNATIVETHREAD)current);
}
DECLHIDDEN(int) rtThreadNativeInit(void)
{
return VINF_SUCCESS;
}
DECLHIDDEN(int) rtThreadNativeSetPriority(PRTTHREADINT pThread, RTTHREADTYPE enmType)
{
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 11)
/* See comment near MAX_RT_PRIO in linux/sched.h for details on
sched_priority. */
int iSchedClass = SCHED_NORMAL;
struct sched_param Param = { .sched_priority = MAX_PRIO - 1 };
switch (enmType)
{
case RTTHREADTYPE_INFREQUENT_POLLER:
Param.sched_priority = MAX_RT_PRIO + 5;
break;
case RTTHREADTYPE_EMULATION:
Param.sched_priority = MAX_RT_PRIO + 4;
break;
case RTTHREADTYPE_DEFAULT:
Param.sched_priority = MAX_RT_PRIO + 3;
break;
case RTTHREADTYPE_MSG_PUMP:
Param.sched_priority = MAX_RT_PRIO + 2;
break;
case RTTHREADTYPE_IO:
iSchedClass = SCHED_FIFO;
Param.sched_priority = MAX_RT_PRIO - 1;
break;
case RTTHREADTYPE_TIMER:
iSchedClass = SCHED_FIFO;
Param.sched_priority = 1; /* not 0 just in case */
break;
default:
AssertMsgFailed(("enmType=%d\n", enmType));
return VERR_INVALID_PARAMETER;
}
sched_setscheduler(current, iSchedClass, &Param);
#else
RT_NOREF_PV(enmType);
#endif
RT_NOREF_PV(pThread);
return VINF_SUCCESS;
}
DECLHIDDEN(int) rtThreadNativeAdopt(PRTTHREADINT pThread)
{
RT_NOREF_PV(pThread);
return VERR_NOT_IMPLEMENTED;
}
DECLHIDDEN(void) rtThreadNativeWaitKludge(PRTTHREADINT pThread)
{
/** @todo fix RTThreadWait/RTR0Term race on linux. */
RTThreadSleep(1); NOREF(pThread);
}
DECLHIDDEN(void) rtThreadNativeDestroy(PRTTHREADINT pThread)
{
NOREF(pThread);
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 4)
/**
* Native kernel thread wrapper function.
*
* This will forward to rtThreadMain and do termination upon return.
*
* @param pvArg Pointer to the argument package.
*/
static int rtThreadNativeMain(void *pvArg)
{
PRTTHREADINT pThread = (PRTTHREADINT)pvArg;
rtThreadMain(pThread, (RTNATIVETHREAD)current, &pThread->szName[0]);
return 0;
}
#endif
DECLHIDDEN(int) rtThreadNativeCreate(PRTTHREADINT pThreadInt, PRTNATIVETHREAD pNativeThread)
{
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 4)
struct task_struct *NativeThread;
IPRT_LINUX_SAVE_EFL_AC();
RT_ASSERT_PREEMPTIBLE();
NativeThread = kthread_run(rtThreadNativeMain, pThreadInt, "iprt-%s", pThreadInt->szName);
if (!IS_ERR(NativeThread))
{
*pNativeThread = (RTNATIVETHREAD)NativeThread;
IPRT_LINUX_RESTORE_EFL_AC();
return VINF_SUCCESS;
}
IPRT_LINUX_RESTORE_EFL_AC();
return VERR_GENERAL_FAILURE;
#else
return VERR_NOT_IMPLEMENTED;
#endif
}
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