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/* $Id: thread-r0drv-os2.cpp $ */
/** @file
* IPRT - Threads (Part 1), Ring-0 Driver, OS/2.
*/
/*
* Contributed by knut st. osmundsen.
*
* Copyright (C) 2007-2023 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
* --------------------------------------------------------------------
*
* This code is based on:
*
* Copyright (c) 2007 knut st. osmundsen <bird-src-spam@anduin.net>
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#include "the-os2-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"
/*********************************************************************************************************************************
* Global Variables *
*********************************************************************************************************************************/
/** Per-cpu preemption counters. */
static int32_t volatile g_acPreemptDisabled[256];
RTDECL(RTNATIVETHREAD) RTThreadNativeSelf(void)
{
PLINFOSEG pLIS = (PLINFOSEG)RTR0Os2Virt2Flat(g_fpLIS);
AssertMsgReturn(pLIS, ("g_fpLIS=%04x:%04x - logging too early again?\n", g_fpLIS.sel, g_fpLIS.off), NIL_RTNATIVETHREAD);
return pLIS->tidCurrent | (pLIS->pidCurrent << 16);
}
static int rtR0ThreadOs2SleepCommon(RTMSINTERVAL cMillies)
{
int rc = KernBlock((ULONG)RTThreadSleep,
cMillies == RT_INDEFINITE_WAIT ? SEM_INDEFINITE_WAIT : cMillies,
0, NULL, NULL);
switch (rc)
{
case NO_ERROR:
return VINF_SUCCESS;
case ERROR_TIMEOUT:
return VERR_TIMEOUT;
case ERROR_INTERRUPT:
return VERR_INTERRUPTED;
default:
AssertMsgFailed(("%d\n", rc));
return VERR_NO_TRANSLATION;
}
}
RTDECL(int) RTThreadSleep(RTMSINTERVAL cMillies)
{
return rtR0ThreadOs2SleepCommon(cMillies);
}
RTDECL(int) RTThreadSleepNoBlock(RTMSINTERVAL cMillies)
{
return rtR0ThreadOs2SleepCommon(cMillies);
}
RTDECL(bool) RTThreadYield(void)
{
/** @todo implement me (requires a devhelp) */
return false;
}
RTDECL(bool) RTThreadPreemptIsEnabled(RTTHREAD hThread)
{
Assert(hThread == NIL_RTTHREAD);
int32_t c = g_acPreemptDisabled[ASMGetApicId()];
AssertMsg(c >= 0 && c < 32, ("%d\n", c));
return c == 0
&& ASMIntAreEnabled();
}
RTDECL(bool) RTThreadPreemptIsPending(RTTHREAD hThread)
{
Assert(hThread == NIL_RTTHREAD);
union
{
RTFAR16 fp;
uint8_t fResched;
} u;
int rc = RTR0Os2DHQueryDOSVar(DHGETDOSV_YIELDFLAG, 0, &u.fp);
AssertReturn(rc == 0, false);
if (u.fResched)
return true;
/** @todo Check if DHGETDOSV_YIELDFLAG includes TCYIELDFLAG. */
rc = RTR0Os2DHQueryDOSVar(DHGETDOSV_TCYIELDFLAG, 0, &u.fp);
AssertReturn(rc == 0, false);
if (u.fResched)
return true;
return false;
}
RTDECL(bool) RTThreadPreemptIsPendingTrusty(void)
{
/* yes, RTThreadPreemptIsPending is reliable. */
return true;
}
RTDECL(bool) RTThreadPreemptIsPossible(void)
{
/* no kernel preemption on OS/2. */
return false;
}
RTDECL(void) RTThreadPreemptDisable(PRTTHREADPREEMPTSTATE pState)
{
AssertPtr(pState);
Assert(pState->u32Reserved == 0);
/* No preemption on OS/2, so do our own accounting. */
int32_t c = ASMAtomicIncS32(&g_acPreemptDisabled[ASMGetApicId()]);
AssertMsg(c > 0 && c < 32, ("%d\n", c));
pState->u32Reserved = c;
RT_ASSERT_PREEMPT_CPUID_DISABLE(pState);
}
RTDECL(void) RTThreadPreemptRestore(PRTTHREADPREEMPTSTATE pState)
{
AssertPtr(pState);
AssertMsg(pState->u32Reserved > 0 && pState->u32Reserved < 32, ("%d\n", pState->u32Reserved));
RT_ASSERT_PREEMPT_CPUID_RESTORE(pState);
/* No preemption on OS/2, so do our own accounting. */
int32_t volatile *pc = &g_acPreemptDisabled[ASMGetApicId()];
AssertMsg(pState->u32Reserved == (uint32_t)*pc, ("uchDummy=%d *pc=%d \n", pState->u32Reserved, *pc));
ASMAtomicUoWriteS32(pc, pState->u32Reserved - 1);
pState->u32Reserved = 0;
}
RTDECL(bool) RTThreadIsInInterrupt(RTTHREAD hThread)
{
Assert(hThread == NIL_RTTHREAD); NOREF(hThread);
union
{
RTFAR16 fp;
uint8_t cInterruptLevel;
} u;
/** @todo OS/2: verify the usage of DHGETDOSV_INTERRUPTLEV. */
int rc = RTR0Os2DHQueryDOSVar(DHGETDOSV_INTERRUPTLEV, 0, &u.fp);
AssertReturn(rc == 0, true);
return u.cInterruptLevel > 0;
}
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