1 | /* $Id: thread-r0drv-solaris.c 106061 2024-09-16 14:03:52Z vboxsync $ */
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2 | /** @file
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3 | * IPRT - Threads, Ring-0 Driver, Solaris.
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4 | */
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5 |
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6 | /*
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7 | * Copyright (C) 2006-2024 Oracle and/or its affiliates.
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8 | *
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9 | * This file is part of VirtualBox base platform packages, as
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10 | * available from https://www.virtualbox.org.
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11 | *
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12 | * This program is free software; you can redistribute it and/or
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13 | * modify it under the terms of the GNU General Public License
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14 | * as published by the Free Software Foundation, in version 3 of the
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15 | * License.
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16 | *
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17 | * This program is distributed in the hope that it will be useful, but
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18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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20 | * General Public License for more details.
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21 | *
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22 | * You should have received a copy of the GNU General Public License
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23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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24 | *
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25 | * The contents of this file may alternatively be used under the terms
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26 | * of the Common Development and Distribution License Version 1.0
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27 | * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
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28 | * in the VirtualBox distribution, in which case the provisions of the
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29 | * CDDL are applicable instead of those of the GPL.
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30 | *
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31 | * You may elect to license modified versions of this file under the
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32 | * terms and conditions of either the GPL or the CDDL or both.
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33 | *
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34 | * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
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35 | */
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36 |
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37 |
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38 | /*********************************************************************************************************************************
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39 | * Header Files *
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40 | *********************************************************************************************************************************/
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41 | #include "the-solaris-kernel.h"
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42 | #include "internal/iprt.h"
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43 | #include <iprt/thread.h>
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44 |
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45 | #if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
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46 | # include <iprt/asm-amd64-x86.h>
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47 | #endif
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48 | #include <iprt/assert.h>
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49 | #include <iprt/errcore.h>
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50 | #include <iprt/mp.h>
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51 |
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52 | #define SOL_THREAD_PREEMPT (*((char *)curthread + g_offrtSolThreadPreempt))
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53 | #define SOL_CPU_RUNRUN (*((char *)CPU + g_offrtSolCpuPreempt))
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54 | #define SOL_CPU_KPRUNRUN (*((char *)CPU + g_offrtSolCpuForceKernelPreempt))
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55 |
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56 | RTDECL(RTNATIVETHREAD) RTThreadNativeSelf(void)
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57 | {
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58 | return (RTNATIVETHREAD)curthread;
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59 | }
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60 |
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61 |
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62 | static int rtR0ThreadSolSleepCommon(RTMSINTERVAL cMillies)
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63 | {
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64 | clock_t cTicks;
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65 | RT_ASSERT_PREEMPTIBLE();
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66 |
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67 | if (!cMillies)
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68 | {
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69 | RTThreadYield();
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70 | return VINF_SUCCESS;
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71 | }
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72 |
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73 | if (cMillies != RT_INDEFINITE_WAIT)
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74 | cTicks = drv_usectohz((clock_t)(cMillies * 1000L));
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75 | else
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76 | cTicks = 0;
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77 |
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78 | delay(cTicks);
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79 | return VINF_SUCCESS;
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80 | }
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81 |
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82 |
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83 | RTDECL(int) RTThreadSleep(RTMSINTERVAL cMillies)
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84 | {
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85 | return rtR0ThreadSolSleepCommon(cMillies);
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86 | }
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87 |
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88 |
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89 | RTDECL(int) RTThreadSleepNoLog(RTMSINTERVAL cMillies)
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90 | {
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91 | return rtR0ThreadSolSleepCommon(cMillies);
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92 | }
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93 |
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94 |
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95 | RTDECL(bool) RTThreadYield(void)
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96 | {
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97 | RT_ASSERT_PREEMPTIBLE();
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98 |
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99 | RTTHREADPREEMPTSTATE PreemptState = RTTHREADPREEMPTSTATE_INITIALIZER;
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100 | RTThreadPreemptDisable(&PreemptState);
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101 |
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102 | char const bThreadPreempt = SOL_THREAD_PREEMPT;
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103 | char const bForcePreempt = SOL_CPU_KPRUNRUN;
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104 | bool fWillYield = false;
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105 | Assert(bThreadPreempt >= 1);
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106 |
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107 | /*
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108 | * If we are the last preemption enabler for this thread and if force
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109 | * preemption is set on the CPU, only then we are guaranteed to be preempted.
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110 | */
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111 | if (bThreadPreempt == 1 && bForcePreempt != 0)
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112 | fWillYield = true;
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113 |
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114 | RTThreadPreemptRestore(&PreemptState);
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115 | return fWillYield;
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116 | }
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117 |
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118 |
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119 | RTDECL(bool) RTThreadPreemptIsEnabled(RTTHREAD hThread)
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120 | {
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121 | Assert(hThread == NIL_RTTHREAD);
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122 | if (RT_UNLIKELY(g_frtSolInitDone == false))
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123 | {
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124 | cmn_err(CE_CONT, "!RTThreadPreemptIsEnabled called before RTR0Init!\n");
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125 | return true;
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126 | }
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127 |
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128 | bool fThreadPreempt = false;
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129 | if (SOL_THREAD_PREEMPT == 0)
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130 | fThreadPreempt = true;
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131 |
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132 | if (!fThreadPreempt)
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133 | return false;
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134 | #if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
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135 | if (!ASMIntAreEnabled())
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136 | return false;
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137 | #endif
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138 | if (getpil() >= DISP_LEVEL)
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139 | return false;
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140 | return true;
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141 | }
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142 |
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143 |
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144 | RTDECL(bool) RTThreadPreemptIsPending(RTTHREAD hThread)
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145 | {
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146 | Assert(hThread == NIL_RTTHREAD);
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147 |
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148 | char const bPreempt = SOL_CPU_RUNRUN;
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149 | char const bForcePreempt = SOL_CPU_KPRUNRUN;
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150 | return (bPreempt != 0 || bForcePreempt != 0);
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151 | }
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152 |
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153 |
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154 | RTDECL(bool) RTThreadPreemptIsPendingTrusty(void)
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155 | {
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156 | /* yes, RTThreadPreemptIsPending is reliable. */
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157 | return true;
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158 | }
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159 |
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160 |
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161 | RTDECL(bool) RTThreadPreemptIsPossible(void)
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162 | {
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163 | /* yes, kernel preemption is possible. */
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164 | return true;
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165 | }
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166 |
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167 |
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168 | RTDECL(void) RTThreadPreemptDisable(PRTTHREADPREEMPTSTATE pState)
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169 | {
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170 | AssertPtr(pState);
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171 |
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172 | SOL_THREAD_PREEMPT++;
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173 | Assert(SOL_THREAD_PREEMPT >= 1);
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174 |
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175 | RT_ASSERT_PREEMPT_CPUID_DISABLE(pState);
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176 | }
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177 |
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178 |
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179 | RTDECL(void) RTThreadPreemptRestore(PRTTHREADPREEMPTSTATE pState)
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180 | {
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181 | AssertPtr(pState);
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182 | RT_ASSERT_PREEMPT_CPUID_RESTORE(pState);
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183 |
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184 | Assert(SOL_THREAD_PREEMPT >= 1);
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185 | if (--SOL_THREAD_PREEMPT == 0 && SOL_CPU_RUNRUN != 0)
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186 | kpreempt(KPREEMPT_SYNC);
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187 | }
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188 |
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189 |
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190 | RTDECL(bool) RTThreadIsInInterrupt(RTTHREAD hThread)
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191 | {
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192 | Assert(hThread == NIL_RTTHREAD);
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193 | return servicing_interrupt() ? true : false;
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194 | }
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195 |
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