| 1 | /* $Id: thread-r0drv-os2.cpp 93115 2022-01-01 11:31:46Z 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) 2007-2022 Oracle Corporation
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| 10 | *
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| 11 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 12 | * available from http://www.virtualbox.org. This file is free software;
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| 13 | * you can redistribute it and/or modify it under the terms of the GNU
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| 14 | * General Public License (GPL) as published by the Free Software
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| 15 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 16 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 17 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 18 | *
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| 19 | * The contents of this file may alternatively be used under the terms
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| 20 | * of the Common Development and Distribution License Version 1.0
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| 21 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 22 | * VirtualBox OSE distribution, in which case the provisions of the
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| 23 | * CDDL are applicable instead of those of the GPL.
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| 24 | *
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| 25 | * You may elect to license modified versions of this file under the
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| 26 | * terms and conditions of either the GPL or the CDDL or both.
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| 27 | * --------------------------------------------------------------------
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| 28 | *
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| 29 | * This code is based on:
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| 30 | *
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| 31 | * Copyright (c) 2007 knut st. osmundsen <[email protected]>
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| 32 | *
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| 33 | * Permission is hereby granted, free of charge, to any person
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| 34 | * obtaining a copy of this software and associated documentation
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| 35 | * files (the "Software"), to deal in the Software without
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| 36 | * restriction, including without limitation the rights to use,
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| 37 | * copy, modify, merge, publish, distribute, sublicense, and/or sell
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| 38 | * copies of the Software, and to permit persons to whom the
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| 39 | * Software is furnished to do so, subject to the following
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| 40 | * conditions:
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| 41 | *
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| 42 | * The above copyright notice and this permission notice shall be
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| 43 | * included in all copies or substantial portions of the Software.
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| 44 | *
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| 45 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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| 46 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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| 47 | * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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| 48 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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| 49 | * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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| 50 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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| 51 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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| 52 | * OTHER DEALINGS IN THE SOFTWARE.
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| 53 | */
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| 54 |
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| 55 |
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| 56 | /*********************************************************************************************************************************
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| 57 | * Header Files *
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| 58 | *********************************************************************************************************************************/
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| 59 | #include "the-os2-kernel.h"
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| 60 | #include "internal/iprt.h"
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| 61 | #include <iprt/thread.h>
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| 62 |
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| 63 | #include <iprt/asm.h>
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| 64 | #include <iprt/asm-amd64-x86.h>
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| 65 | #include <iprt/assert.h>
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| 66 | #include <iprt/err.h>
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| 67 | #include <iprt/mp.h>
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| 68 | #include "internal/thread.h"
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| 69 |
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| 70 |
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| 71 | /*********************************************************************************************************************************
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| 72 | * Global Variables *
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| 73 | *********************************************************************************************************************************/
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| 74 | /** Per-cpu preemption counters. */
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| 75 | static int32_t volatile g_acPreemptDisabled[256];
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| 76 |
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| 77 |
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| 78 |
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| 79 | RTDECL(RTNATIVETHREAD) RTThreadNativeSelf(void)
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| 80 | {
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| 81 | PLINFOSEG pLIS = (PLINFOSEG)RTR0Os2Virt2Flat(g_fpLIS);
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| 82 | AssertMsgReturn(pLIS, ("g_fpLIS=%04x:%04x - logging too early again?\n", g_fpLIS.sel, g_fpLIS.off), NIL_RTNATIVETHREAD);
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| 83 | return pLIS->tidCurrent | (pLIS->pidCurrent << 16);
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| 84 | }
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| 85 |
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| 86 |
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| 87 | static int rtR0ThreadOs2SleepCommon(RTMSINTERVAL cMillies)
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| 88 | {
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| 89 | int rc = KernBlock((ULONG)RTThreadSleep,
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| 90 | cMillies == RT_INDEFINITE_WAIT ? SEM_INDEFINITE_WAIT : cMillies,
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| 91 | 0, NULL, NULL);
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| 92 | switch (rc)
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| 93 | {
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| 94 | case NO_ERROR:
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| 95 | return VINF_SUCCESS;
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| 96 | case ERROR_TIMEOUT:
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| 97 | return VERR_TIMEOUT;
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| 98 | case ERROR_INTERRUPT:
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| 99 | return VERR_INTERRUPTED;
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| 100 | default:
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| 101 | AssertMsgFailed(("%d\n", rc));
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| 102 | return VERR_NO_TRANSLATION;
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| 103 | }
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| 104 | }
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| 105 |
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| 106 |
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| 107 | RTDECL(int) RTThreadSleep(RTMSINTERVAL cMillies)
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| 108 | {
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| 109 | return rtR0ThreadOs2SleepCommon(cMillies);
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| 110 | }
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| 111 |
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| 112 |
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| 113 | RTDECL(int) RTThreadSleepNoBlock(RTMSINTERVAL cMillies)
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| 114 | {
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| 115 | return rtR0ThreadOs2SleepCommon(cMillies);
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| 116 | }
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| 117 |
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| 118 |
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| 119 | RTDECL(bool) RTThreadYield(void)
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| 120 | {
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| 121 | /** @todo implement me (requires a devhelp) */
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| 122 | return false;
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| 123 | }
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| 124 |
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| 125 |
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| 126 | RTDECL(bool) RTThreadPreemptIsEnabled(RTTHREAD hThread)
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| 127 | {
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| 128 | Assert(hThread == NIL_RTTHREAD);
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| 129 | int32_t c = g_acPreemptDisabled[ASMGetApicId()];
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| 130 | AssertMsg(c >= 0 && c < 32, ("%d\n", c));
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| 131 | return c == 0
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| 132 | && ASMIntAreEnabled();
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| 133 | }
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| 134 |
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| 135 |
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| 136 | RTDECL(bool) RTThreadPreemptIsPending(RTTHREAD hThread)
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| 137 | {
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| 138 | Assert(hThread == NIL_RTTHREAD);
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| 139 |
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| 140 | union
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| 141 | {
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| 142 | RTFAR16 fp;
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| 143 | uint8_t fResched;
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| 144 | } u;
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| 145 | int rc = RTR0Os2DHQueryDOSVar(DHGETDOSV_YIELDFLAG, 0, &u.fp);
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| 146 | AssertReturn(rc == 0, false);
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| 147 | if (u.fResched)
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| 148 | return true;
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| 149 |
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| 150 | /** @todo Check if DHGETDOSV_YIELDFLAG includes TCYIELDFLAG. */
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| 151 | rc = RTR0Os2DHQueryDOSVar(DHGETDOSV_TCYIELDFLAG, 0, &u.fp);
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| 152 | AssertReturn(rc == 0, false);
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| 153 | if (u.fResched)
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| 154 | return true;
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| 155 | return false;
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| 156 | }
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| 157 |
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| 158 |
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| 159 | RTDECL(bool) RTThreadPreemptIsPendingTrusty(void)
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| 160 | {
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| 161 | /* yes, RTThreadPreemptIsPending is reliable. */
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| 162 | return true;
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| 163 | }
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| 164 |
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| 165 |
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| 166 | RTDECL(bool) RTThreadPreemptIsPossible(void)
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| 167 | {
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| 168 | /* no kernel preemption on OS/2. */
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| 169 | return false;
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| 170 | }
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| 171 |
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| 172 |
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| 173 | RTDECL(void) RTThreadPreemptDisable(PRTTHREADPREEMPTSTATE pState)
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| 174 | {
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| 175 | AssertPtr(pState);
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| 176 | Assert(pState->u32Reserved == 0);
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| 177 |
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| 178 | /* No preemption on OS/2, so do our own accounting. */
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| 179 | int32_t c = ASMAtomicIncS32(&g_acPreemptDisabled[ASMGetApicId()]);
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| 180 | AssertMsg(c > 0 && c < 32, ("%d\n", c));
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| 181 | pState->u32Reserved = c;
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| 182 | RT_ASSERT_PREEMPT_CPUID_DISABLE(pState);
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| 183 | }
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| 184 |
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| 185 |
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| 186 | RTDECL(void) RTThreadPreemptRestore(PRTTHREADPREEMPTSTATE pState)
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| 187 | {
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| 188 | AssertPtr(pState);
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| 189 | AssertMsg(pState->u32Reserved > 0 && pState->u32Reserved < 32, ("%d\n", pState->u32Reserved));
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| 190 | RT_ASSERT_PREEMPT_CPUID_RESTORE(pState);
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| 191 |
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| 192 | /* No preemption on OS/2, so do our own accounting. */
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| 193 | int32_t volatile *pc = &g_acPreemptDisabled[ASMGetApicId()];
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| 194 | AssertMsg(pState->u32Reserved == (uint32_t)*pc, ("uchDummy=%d *pc=%d \n", pState->u32Reserved, *pc));
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| 195 | ASMAtomicUoWriteS32(pc, pState->u32Reserved - 1);
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| 196 | pState->u32Reserved = 0;
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| 197 | }
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| 198 |
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| 199 |
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| 200 | RTDECL(bool) RTThreadIsInInterrupt(RTTHREAD hThread)
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| 201 | {
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| 202 | Assert(hThread == NIL_RTTHREAD); NOREF(hThread);
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| 203 |
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| 204 | union
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| 205 | {
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| 206 | RTFAR16 fp;
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| 207 | uint8_t cInterruptLevel;
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| 208 | } u;
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| 209 | /** @todo OS/2: verify the usage of DHGETDOSV_INTERRUPTLEV. */
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| 210 | int rc = RTR0Os2DHQueryDOSVar(DHGETDOSV_INTERRUPTLEV, 0, &u.fp);
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| 211 | AssertReturn(rc == 0, true);
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| 212 |
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| 213 | return u.cInterruptLevel > 0;
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| 214 | }
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| 215 |
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