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/* $Id: thread-r0drv-solaris.c $ */
/** @file
* IPRT - Threads, Ring-0 Driver, Solaris.
*/
/*
* 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-solaris-kernel.h"
#include "internal/iprt.h"
#include <iprt/thread.h>
#if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
# include <iprt/asm-amd64-x86.h>
#endif
#include <iprt/assert.h>
#include <iprt/errcore.h>
#include <iprt/mp.h>
#define SOL_THREAD_PREEMPT (*((char *)curthread + g_offrtSolThreadPreempt))
#define SOL_CPU_RUNRUN (*((char *)CPU + g_offrtSolCpuPreempt))
#define SOL_CPU_KPRUNRUN (*((char *)CPU + g_offrtSolCpuForceKernelPreempt))
RTDECL(RTNATIVETHREAD) RTThreadNativeSelf(void)
{
return (RTNATIVETHREAD)curthread;
}
static int rtR0ThreadSolSleepCommon(RTMSINTERVAL cMillies)
{
clock_t cTicks;
RT_ASSERT_PREEMPTIBLE();
if (!cMillies)
{
RTThreadYield();
return VINF_SUCCESS;
}
if (cMillies != RT_INDEFINITE_WAIT)
cTicks = drv_usectohz((clock_t)(cMillies * 1000L));
else
cTicks = 0;
delay(cTicks);
return VINF_SUCCESS;
}
RTDECL(int) RTThreadSleep(RTMSINTERVAL cMillies)
{
return rtR0ThreadSolSleepCommon(cMillies);
}
RTDECL(int) RTThreadSleepNoLog(RTMSINTERVAL cMillies)
{
return rtR0ThreadSolSleepCommon(cMillies);
}
RTDECL(bool) RTThreadYield(void)
{
RT_ASSERT_PREEMPTIBLE();
RTTHREADPREEMPTSTATE PreemptState = RTTHREADPREEMPTSTATE_INITIALIZER;
RTThreadPreemptDisable(&PreemptState);
char const bThreadPreempt = SOL_THREAD_PREEMPT;
char const bForcePreempt = SOL_CPU_KPRUNRUN;
bool fWillYield = false;
Assert(bThreadPreempt >= 1);
/*
* If we are the last preemption enabler for this thread and if force
* preemption is set on the CPU, only then we are guaranteed to be preempted.
*/
if (bThreadPreempt == 1 && bForcePreempt != 0)
fWillYield = true;
RTThreadPreemptRestore(&PreemptState);
return fWillYield;
}
RTDECL(bool) RTThreadPreemptIsEnabled(RTTHREAD hThread)
{
Assert(hThread == NIL_RTTHREAD);
if (RT_UNLIKELY(g_frtSolInitDone == false))
{
cmn_err(CE_CONT, "!RTThreadPreemptIsEnabled called before RTR0Init!\n");
return true;
}
bool fThreadPreempt = false;
if (SOL_THREAD_PREEMPT == 0)
fThreadPreempt = true;
if (!fThreadPreempt)
return false;
#if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
if (!ASMIntAreEnabled())
return false;
#endif
if (getpil() >= DISP_LEVEL)
return false;
return true;
}
RTDECL(bool) RTThreadPreemptIsPending(RTTHREAD hThread)
{
Assert(hThread == NIL_RTTHREAD);
char const bPreempt = SOL_CPU_RUNRUN;
char const bForcePreempt = SOL_CPU_KPRUNRUN;
return (bPreempt != 0 || bForcePreempt != 0);
}
RTDECL(bool) RTThreadPreemptIsPendingTrusty(void)
{
/* yes, RTThreadPreemptIsPending is reliable. */
return true;
}
RTDECL(bool) RTThreadPreemptIsPossible(void)
{
/* yes, kernel preemption is possible. */
return true;
}
RTDECL(void) RTThreadPreemptDisable(PRTTHREADPREEMPTSTATE pState)
{
AssertPtr(pState);
SOL_THREAD_PREEMPT++;
Assert(SOL_THREAD_PREEMPT >= 1);
RT_ASSERT_PREEMPT_CPUID_DISABLE(pState);
}
RTDECL(void) RTThreadPreemptRestore(PRTTHREADPREEMPTSTATE pState)
{
AssertPtr(pState);
RT_ASSERT_PREEMPT_CPUID_RESTORE(pState);
Assert(SOL_THREAD_PREEMPT >= 1);
if (--SOL_THREAD_PREEMPT == 0 && SOL_CPU_RUNRUN != 0)
kpreempt(KPREEMPT_SYNC);
}
RTDECL(bool) RTThreadIsInInterrupt(RTTHREAD hThread)
{
Assert(hThread == NIL_RTTHREAD);
return servicing_interrupt() ? true : false;
}
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