| 1 | /* $Id: thread-r0drv-os2.cpp 106061 2024-09-16 14:03:52Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - Threads (Part 1), Ring-0 Driver, OS/2.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Contributed by knut st. osmundsen.
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| 8 | *
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| 9 | * Copyright (C) 2007-2024 Oracle and/or its affiliates.
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| 10 | *
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| 11 | * This file is part of VirtualBox base platform packages, as
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| 12 | * available from https://www.virtualbox.org.
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| 13 | *
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| 14 | * This program is free software; you can redistribute it and/or
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| 15 | * modify it under the terms of the GNU General Public License
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| 16 | * as published by the Free Software Foundation, in version 3 of the
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| 17 | * License.
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| 18 | *
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| 19 | * This program is distributed in the hope that it will be useful, but
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| 20 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 22 | * General Public License for more details.
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| 23 | *
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| 24 | * You should have received a copy of the GNU General Public License
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| 25 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 26 | *
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| 27 | * The contents of this file may alternatively be used under the terms
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| 28 | * of the Common Development and Distribution License Version 1.0
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| 29 | * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
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| 30 | * in the VirtualBox distribution, in which case the provisions of the
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| 31 | * CDDL are applicable instead of those of the GPL.
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| 32 | *
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| 33 | * You may elect to license modified versions of this file under the
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| 34 | * terms and conditions of either the GPL or the CDDL or both.
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| 35 | *
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| 36 | * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
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| 37 | * --------------------------------------------------------------------
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| 38 | *
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| 39 | * This code is based on:
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| 40 | *
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| 41 | * Copyright (c) 2007 knut st. osmundsen <bird-src-spam@anduin.net>
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| 42 | *
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| 43 | * Permission is hereby granted, free of charge, to any person
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| 44 | * obtaining a copy of this software and associated documentation
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| 45 | * files (the "Software"), to deal in the Software without
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| 46 | * restriction, including without limitation the rights to use,
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| 47 | * copy, modify, merge, publish, distribute, sublicense, and/or sell
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| 48 | * copies of the Software, and to permit persons to whom the
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| 49 | * Software is furnished to do so, subject to the following
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| 50 | * conditions:
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| 51 | *
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| 52 | * The above copyright notice and this permission notice shall be
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| 53 | * included in all copies or substantial portions of the Software.
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| 54 | *
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| 55 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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| 56 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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| 57 | * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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| 58 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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| 59 | * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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| 60 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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| 61 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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| 62 | * OTHER DEALINGS IN THE SOFTWARE.
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| 63 | */
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| 64 |
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| 65 |
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| 66 | /*********************************************************************************************************************************
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| 67 | * Header Files *
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| 68 | *********************************************************************************************************************************/
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| 69 | #include "the-os2-kernel.h"
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| 70 | #include "internal/iprt.h"
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| 71 | #include <iprt/thread.h>
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| 72 |
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| 73 | #include <iprt/asm.h>
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| 74 | #include <iprt/asm-amd64-x86.h>
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| 75 | #include <iprt/assert.h>
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| 76 | #include <iprt/err.h>
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| 77 | #include <iprt/mp.h>
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| 78 | #include "internal/thread.h"
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| 79 |
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| 80 |
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| 81 | /*********************************************************************************************************************************
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| 82 | * Global Variables *
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| 83 | *********************************************************************************************************************************/
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| 84 | /** Per-cpu preemption counters. */
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| 85 | static int32_t volatile g_acPreemptDisabled[256];
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| 86 |
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| 87 |
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| 88 |
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| 89 | RTDECL(RTNATIVETHREAD) RTThreadNativeSelf(void)
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| 90 | {
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| 91 | PLINFOSEG pLIS = (PLINFOSEG)RTR0Os2Virt2Flat(g_fpLIS);
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| 92 | AssertMsgReturn(pLIS, ("g_fpLIS=%04x:%04x - logging too early again?\n", g_fpLIS.sel, g_fpLIS.off), NIL_RTNATIVETHREAD);
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| 93 | return pLIS->tidCurrent | (pLIS->pidCurrent << 16);
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| 94 | }
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| 95 |
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| 96 |
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| 97 | static int rtR0ThreadOs2SleepCommon(RTMSINTERVAL cMillies)
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| 98 | {
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| 99 | int rc = KernBlock((ULONG)RTThreadSleep,
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| 100 | cMillies == RT_INDEFINITE_WAIT ? SEM_INDEFINITE_WAIT : cMillies,
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| 101 | 0, NULL, NULL);
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| 102 | switch (rc)
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| 103 | {
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| 104 | case NO_ERROR:
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| 105 | return VINF_SUCCESS;
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| 106 | case ERROR_TIMEOUT:
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| 107 | return VERR_TIMEOUT;
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| 108 | case ERROR_INTERRUPT:
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| 109 | return VERR_INTERRUPTED;
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| 110 | default:
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| 111 | AssertMsgFailed(("%d\n", rc));
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| 112 | return VERR_NO_TRANSLATION;
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| 113 | }
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| 114 | }
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| 115 |
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| 116 |
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| 117 | RTDECL(int) RTThreadSleep(RTMSINTERVAL cMillies)
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| 118 | {
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| 119 | return rtR0ThreadOs2SleepCommon(cMillies);
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| 120 | }
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| 121 |
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| 122 |
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| 123 | RTDECL(int) RTThreadSleepNoBlock(RTMSINTERVAL cMillies)
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| 124 | {
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| 125 | return rtR0ThreadOs2SleepCommon(cMillies);
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| 126 | }
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| 127 |
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| 128 |
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| 129 | RTDECL(bool) RTThreadYield(void)
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| 130 | {
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| 131 | /** @todo implement me (requires a devhelp) */
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| 132 | return false;
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| 133 | }
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| 134 |
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| 135 |
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| 136 | RTDECL(bool) RTThreadPreemptIsEnabled(RTTHREAD hThread)
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| 137 | {
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| 138 | Assert(hThread == NIL_RTTHREAD);
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| 139 | int32_t c = g_acPreemptDisabled[ASMGetApicId()];
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| 140 | AssertMsg(c >= 0 && c < 32, ("%d\n", c));
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| 141 | return c == 0
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| 142 | && ASMIntAreEnabled();
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| 143 | }
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| 144 |
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| 145 |
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| 146 | RTDECL(bool) RTThreadPreemptIsPending(RTTHREAD hThread)
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| 147 | {
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| 148 | Assert(hThread == NIL_RTTHREAD);
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| 149 |
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| 150 | union
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| 151 | {
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| 152 | RTFAR16 fp;
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| 153 | uint8_t fResched;
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| 154 | } u;
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| 155 | int rc = RTR0Os2DHQueryDOSVar(DHGETDOSV_YIELDFLAG, 0, &u.fp);
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| 156 | AssertReturn(rc == 0, false);
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| 157 | if (u.fResched)
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| 158 | return true;
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| 159 |
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| 160 | /** @todo Check if DHGETDOSV_YIELDFLAG includes TCYIELDFLAG. */
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| 161 | rc = RTR0Os2DHQueryDOSVar(DHGETDOSV_TCYIELDFLAG, 0, &u.fp);
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| 162 | AssertReturn(rc == 0, false);
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| 163 | if (u.fResched)
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| 164 | return true;
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| 165 | return false;
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| 166 | }
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| 167 |
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| 168 |
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| 169 | RTDECL(bool) RTThreadPreemptIsPendingTrusty(void)
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| 170 | {
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| 171 | /* yes, RTThreadPreemptIsPending is reliable. */
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| 172 | return true;
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| 173 | }
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| 174 |
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| 175 |
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| 176 | RTDECL(bool) RTThreadPreemptIsPossible(void)
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| 177 | {
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| 178 | /* no kernel preemption on OS/2. */
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| 179 | return false;
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| 180 | }
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| 181 |
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| 182 |
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| 183 | RTDECL(void) RTThreadPreemptDisable(PRTTHREADPREEMPTSTATE pState)
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| 184 | {
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| 185 | AssertPtr(pState);
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| 186 | Assert(pState->u32Reserved == 0);
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| 187 |
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| 188 | /* No preemption on OS/2, so do our own accounting. */
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| 189 | int32_t c = ASMAtomicIncS32(&g_acPreemptDisabled[ASMGetApicId()]);
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| 190 | AssertMsg(c > 0 && c < 32, ("%d\n", c));
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| 191 | pState->u32Reserved = c;
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| 192 | RT_ASSERT_PREEMPT_CPUID_DISABLE(pState);
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| 193 | }
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| 194 |
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| 195 |
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| 196 | RTDECL(void) RTThreadPreemptRestore(PRTTHREADPREEMPTSTATE pState)
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| 197 | {
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| 198 | AssertPtr(pState);
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| 199 | AssertMsg(pState->u32Reserved > 0 && pState->u32Reserved < 32, ("%d\n", pState->u32Reserved));
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| 200 | RT_ASSERT_PREEMPT_CPUID_RESTORE(pState);
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| 201 |
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| 202 | /* No preemption on OS/2, so do our own accounting. */
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| 203 | int32_t volatile *pc = &g_acPreemptDisabled[ASMGetApicId()];
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| 204 | AssertMsg(pState->u32Reserved == (uint32_t)*pc, ("uchDummy=%d *pc=%d \n", pState->u32Reserved, *pc));
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| 205 | ASMAtomicUoWriteS32(pc, pState->u32Reserved - 1);
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| 206 | pState->u32Reserved = 0;
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| 207 | }
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| 208 |
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| 209 |
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| 210 | RTDECL(bool) RTThreadIsInInterrupt(RTTHREAD hThread)
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| 211 | {
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| 212 | Assert(hThread == NIL_RTTHREAD); NOREF(hThread);
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| 213 |
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| 214 | union
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| 215 | {
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| 216 | RTFAR16 fp;
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| 217 | uint8_t cInterruptLevel;
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| 218 | } u;
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| 219 | /** @todo OS/2: verify the usage of DHGETDOSV_INTERRUPTLEV. */
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| 220 | int rc = RTR0Os2DHQueryDOSVar(DHGETDOSV_INTERRUPTLEV, 0, &u.fp);
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| 221 | AssertReturn(rc == 0, true);
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| 222 |
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| 223 | return u.cInterruptLevel > 0;
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| 224 | }
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| 225 |
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