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/* $Id: thread-r0drv-freebsd.c $ */
/** @file
* IPRT - Threads (Part 1), Ring-0 Driver, FreeBSD.
*/
/*
* Copyright (C) 2007-2019 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-freebsd-kernel.h"
#include "internal/iprt.h"
#include <iprt/thread.h>
#include <iprt/asm.h>
#include <iprt/asm-amd64-x86.h>
#include <iprt/assert.h>
#include <iprt/err.h>
#include <iprt/mp.h>
#include "internal/thread.h"
RTDECL(RTNATIVETHREAD) RTThreadNativeSelf(void)
{
return (RTNATIVETHREAD)curthread;
}
static int rtR0ThreadFbsdSleepCommon(RTMSINTERVAL cMillies)
{
int rc;
int cTicks;
/*
* 0 ms sleep -> yield.
*/
if (!cMillies)
{
RTThreadYield();
return VINF_SUCCESS;
}
/*
* Translate milliseconds into ticks and go to sleep.
*/
if (cMillies != RT_INDEFINITE_WAIT)
{
if (hz == 1000)
cTicks = cMillies;
else if (hz == 100)
cTicks = cMillies / 10;
else
{
int64_t cTicks64 = ((uint64_t)cMillies * hz) / 1000;
cTicks = (int)cTicks64;
if (cTicks != cTicks64)
cTicks = INT_MAX;
}
}
else
cTicks = 0; /* requires giant lock! */
rc = tsleep((void *)RTThreadSleep,
PZERO | PCATCH,
"iprtsl", /* max 6 chars */
cTicks);
switch (rc)
{
case 0:
return VINF_SUCCESS;
case EWOULDBLOCK:
return VERR_TIMEOUT;
case EINTR:
case ERESTART:
return VERR_INTERRUPTED;
default:
AssertMsgFailed(("%d\n", rc));
return VERR_NO_TRANSLATION;
}
}
RTDECL(int) RTThreadSleep(RTMSINTERVAL cMillies)
{
return rtR0ThreadFbsdSleepCommon(cMillies);
}
RTDECL(int) RTThreadSleepNoLog(RTMSINTERVAL cMillies)
{
return rtR0ThreadFbsdSleepCommon(cMillies);
}
RTDECL(bool) RTThreadYield(void)
{
#if __FreeBSD_version >= 900032
kern_yield(curthread->td_user_pri);
#else
uio_yield();
#endif
return false; /** @todo figure this one ... */
}
RTDECL(bool) RTThreadPreemptIsEnabled(RTTHREAD hThread)
{
Assert(hThread == NIL_RTTHREAD);
return curthread->td_critnest == 0
&& ASMIntAreEnabled(); /** @todo is there a native freebsd function/macro for this? */
}
RTDECL(bool) RTThreadPreemptIsPending(RTTHREAD hThread)
{
Assert(hThread == NIL_RTTHREAD);
return curthread->td_owepreempt == 1;
}
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);
Assert(pState->u32Reserved == 0);
pState->u32Reserved = 42;
critical_enter();
RT_ASSERT_PREEMPT_CPUID_DISABLE(pState);
}
RTDECL(void) RTThreadPreemptRestore(PRTTHREADPREEMPTSTATE pState)
{
AssertPtr(pState);
Assert(pState->u32Reserved == 42);
pState->u32Reserved = 0;
RT_ASSERT_PREEMPT_CPUID_RESTORE(pState);
critical_exit();
}
RTDECL(bool) RTThreadIsInInterrupt(RTTHREAD hThread)
{
Assert(hThread == NIL_RTTHREAD); NOREF(hThread);
/** @todo FreeBSD: Implement RTThreadIsInInterrupt. Required for guest
* additions! */
return !ASMIntAreEnabled();
}
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