1 | /* $Id: thread-r0drv-freebsd.c 56290 2015-06-09 14:01:31Z vboxsync $ */
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2 | /** @file
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3 | * IPRT - Threads (Part 1), Ring-0 Driver, FreeBSD.
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4 | */
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5 |
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6 | /*
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7 | * Copyright (C) 2007-2015 Oracle Corporation
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8 | *
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9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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10 | * available from http://www.virtualbox.org. This file is free software;
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11 | * you can redistribute it and/or modify it under the terms of the GNU
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12 | * General Public License (GPL) as published by the Free Software
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13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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16 | *
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17 | * The contents of this file may alternatively be used under the terms
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18 | * of the Common Development and Distribution License Version 1.0
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19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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20 | * VirtualBox OSE distribution, in which case the provisions of the
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21 | * CDDL are applicable instead of those of the GPL.
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22 | *
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23 | * You may elect to license modified versions of this file under the
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24 | * terms and conditions of either the GPL or the CDDL or both.
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25 | */
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26 |
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27 | /*******************************************************************************
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28 | * Header Files *
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29 | *******************************************************************************/
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30 | #include "the-freebsd-kernel.h"
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31 | #include "internal/iprt.h"
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32 | #include <iprt/thread.h>
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33 |
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34 | #include <iprt/asm.h>
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35 | #include <iprt/asm-amd64-x86.h>
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36 | #include <iprt/assert.h>
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37 | #include <iprt/err.h>
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38 | #include <iprt/mp.h>
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39 | #include "internal/thread.h"
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40 |
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41 |
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42 | RTDECL(RTNATIVETHREAD) RTThreadNativeSelf(void)
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43 | {
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44 | return (RTNATIVETHREAD)curthread;
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45 | }
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46 |
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47 |
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48 | static int rtR0ThreadFbsdSleepCommon(RTMSINTERVAL cMillies)
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49 | {
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50 | int rc;
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51 | int cTicks;
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52 |
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53 | /*
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54 | * 0 ms sleep -> yield.
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55 | */
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56 | if (!cMillies)
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57 | {
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58 | RTThreadYield();
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59 | return VINF_SUCCESS;
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60 | }
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61 |
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62 | /*
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63 | * Translate milliseconds into ticks and go to sleep.
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64 | */
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65 | if (cMillies != RT_INDEFINITE_WAIT)
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66 | {
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67 | if (hz == 1000)
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68 | cTicks = cMillies;
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69 | else if (hz == 100)
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70 | cTicks = cMillies / 10;
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71 | else
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72 | {
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73 | int64_t cTicks64 = ((uint64_t)cMillies * hz) / 1000;
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74 | cTicks = (int)cTicks64;
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75 | if (cTicks != cTicks64)
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76 | cTicks = INT_MAX;
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77 | }
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78 | }
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79 | else
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80 | cTicks = 0; /* requires giant lock! */
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81 |
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82 | rc = tsleep((void *)RTThreadSleep,
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83 | PZERO | PCATCH,
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84 | "iprtsl", /* max 6 chars */
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85 | cTicks);
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86 | switch (rc)
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87 | {
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88 | case 0:
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89 | return VINF_SUCCESS;
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90 | case EWOULDBLOCK:
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91 | return VERR_TIMEOUT;
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92 | case EINTR:
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93 | case ERESTART:
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94 | return VERR_INTERRUPTED;
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95 | default:
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96 | AssertMsgFailed(("%d\n", rc));
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97 | return VERR_NO_TRANSLATION;
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98 | }
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99 | }
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100 |
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101 |
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102 | RTDECL(int) RTThreadSleep(RTMSINTERVAL cMillies)
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103 | {
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104 | return rtR0ThreadFbsdSleepCommon(cMillies);
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105 | }
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106 |
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107 |
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108 | RTDECL(int) RTThreadSleepNoLog(RTMSINTERVAL cMillies)
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109 | {
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110 | return rtR0ThreadFbsdSleepCommon(cMillies);
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111 | }
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112 |
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113 |
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114 | RTDECL(bool) RTThreadYield(void)
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115 | {
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116 | #if __FreeBSD_version >= 900032
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117 | kern_yield(curthread->td_user_pri);
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118 | #else
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119 | uio_yield();
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120 | #endif
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121 | return false; /** @todo figure this one ... */
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122 | }
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123 |
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124 |
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125 | RTDECL(bool) RTThreadPreemptIsEnabled(RTTHREAD hThread)
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126 | {
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127 | Assert(hThread == NIL_RTTHREAD);
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128 |
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129 | return curthread->td_critnest == 0
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130 | && ASMIntAreEnabled(); /** @todo is there a native freebsd function/macro for this? */
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131 | }
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132 |
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133 |
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134 | RTDECL(bool) RTThreadPreemptIsPending(RTTHREAD hThread)
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135 | {
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136 | Assert(hThread == NIL_RTTHREAD);
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137 |
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138 | return curthread->td_owepreempt == 1;
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139 | }
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140 |
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141 |
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142 | RTDECL(bool) RTThreadPreemptIsPendingTrusty(void)
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143 | {
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144 | /* yes, RTThreadPreemptIsPending is reliable. */
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145 | return true;
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146 | }
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147 |
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148 |
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149 | RTDECL(bool) RTThreadPreemptIsPossible(void)
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150 | {
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151 | /* yes, kernel preemption is possible. */
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152 | return true;
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153 | }
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154 |
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155 |
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156 | RTDECL(void) RTThreadPreemptDisable(PRTTHREADPREEMPTSTATE pState)
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157 | {
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158 | AssertPtr(pState);
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159 | Assert(pState->u32Reserved == 0);
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160 | pState->u32Reserved = 42;
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161 |
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162 | critical_enter();
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163 | RT_ASSERT_PREEMPT_CPUID_DISABLE(pState);
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164 | }
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165 |
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166 |
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167 | RTDECL(void) RTThreadPreemptRestore(PRTTHREADPREEMPTSTATE pState)
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168 | {
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169 | AssertPtr(pState);
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170 | Assert(pState->u32Reserved == 42);
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171 | pState->u32Reserved = 0;
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172 |
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173 | RT_ASSERT_PREEMPT_CPUID_RESTORE(pState);
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174 | critical_exit();
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175 | }
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176 |
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177 |
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178 | RTDECL(bool) RTThreadIsInInterrupt(RTTHREAD hThread)
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179 | {
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180 | Assert(hThread == NIL_RTTHREAD); NOREF(hThread);
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181 | /** @todo FreeBSD: Implement RTThreadIsInInterrupt. Required for guest
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182 | * additions! */
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183 | return !ASMIntAreEnabled();
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184 | }
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185 |
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