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/* $Id: thread2-r0drv-linux.c $ */
/** @file
* IPRT - Threads (Part 2), Ring-0 Driver, Linux.
*/
/*
* Copyright (C) 2006-2023 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
* in the VirtualBox 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.
*
* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
*/
/*********************************************************************************************************************************
* 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"
#if RTLNX_VER_MIN(4,11,0)
#include <uapi/linux/sched/types.h>
#endif /* >= KERNEL_VERSION(4, 11, 0) */
RTDECL(RTTHREAD) RTThreadSelf(void)
{
return rtThreadGetByNative((RTNATIVETHREAD)current);
}
DECLHIDDEN(int) rtThreadNativeInit(void)
{
return VINF_SUCCESS;
}
DECLHIDDEN(int) rtThreadNativeSetPriority(PRTTHREADINT pThread, RTTHREADTYPE enmType)
{
#if RTLNX_VER_MIN(2,5,2)
/*
* Assignments are partially based on g_aTypesLinuxFree but
* scaled up in the high priority end.
*
* 5.9.0 - :
* The sched_set_normal interfaces does not really check the input,
* whereas sched_set_fifo & sched_set_fifo_low have fixed assignments.
* 2.6.11 - 5.9.0:
* Use sched_setscheduler to try effect FIFO scheduling
* for IO and TIMER threads, otherwise use set_user_nice.
* 2.5.2 - 5.9.0:
* Use set_user_nice to renice the thread.
*/
int iNice = 0;
# if RTLNX_VER_MAX(5,9,0)
int rc;
# if RTLNX_VER_MIN(2,6,11)
int iSchedClass = SCHED_NORMAL;
struct sched_param Param = { .sched_priority = 0 };
# endif
# endif
switch (enmType)
{
case RTTHREADTYPE_INFREQUENT_POLLER:
iNice = +3;
break;
case RTTHREADTYPE_MAIN_HEAVY_WORKER:
iNice = +2;
break;
case RTTHREADTYPE_EMULATION:
iNice = +1;
break;
case RTTHREADTYPE_DEFAULT:
case RTTHREADTYPE_GUI:
case RTTHREADTYPE_MAIN_WORKER:
iNice = 0;
break;
case RTTHREADTYPE_VRDP_IO:
case RTTHREADTYPE_DEBUGGER:
iNice = -1;
break;
case RTTHREADTYPE_MSG_PUMP:
iNice = -2;
break;
case RTTHREADTYPE_IO:
# if RTLNX_VER_MIN(5,9,0)
sched_set_fifo_low(current);
return VINF_SUCCESS;
# else
iNice = -12;
# if RTLNX_VER_MIN(2,6,11)
iSchedClass = SCHED_FIFO;
Param.sched_priority = 1; /* => prio=98; */
# endif
break;
# endif
case RTTHREADTYPE_TIMER:
# if RTLNX_VER_MIN(5,9,0)
sched_set_fifo(current);
return VINF_SUCCESS;
# else
iNice = -19;
# if RTLNX_VER_MIN(2,6,11)
iSchedClass = SCHED_FIFO;
Param.sched_priority = MAX_RT_PRIO / 2; /* => prio=49 */
# endif
break;
# endif
default:
AssertMsgFailedReturn(("enmType=%d\n", enmType), VERR_INVALID_PARAMETER);
}
# if RTLNX_VER_MIN(5,9,0)
/*
* We only get here for renice work.
*/
sched_set_normal(current, iNice);
# else /* < 5.9.0 */
# if RTLNX_VER_MIN(2,6,11)
/*
* Try set scheduler parameters.
* Fall back on normal + nice if this fails for FIFO policy.*
*/
rc = sched_setscheduler(current, iSchedClass, &Param);
if (rc)
{
Param.sched_priority = 0;
iSchedClass = SCHED_NORMAL;
rc = sched_setscheduler(current, iSchedClass, &Param);
}
/*
* Renice if using normal scheduling class.
*/
if (iSchedClass == SCHED_NORMAL)
# endif /* >= 2.6.11 */
set_user_nice(current, iNice);
# endif /* < 5.9.0 */
#else /* < 2.5.2 */
RT_NOREF_PV(enmType);
#endif /* < 2.5.2 */
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 RTLNX_VER_MIN(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 RTLNX_VER_MIN(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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