1 | /* $Id: semeventwait-r0drv-solaris.h 106061 2024-09-16 14:03:52Z vboxsync $ */
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2 | /** @file
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3 | * IPRT - Solaris Ring-0 Driver Helpers for Event Semaphore Waits.
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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 | #ifndef IPRT_INCLUDED_SRC_r0drv_solaris_semeventwait_r0drv_solaris_h
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38 | #define IPRT_INCLUDED_SRC_r0drv_solaris_semeventwait_r0drv_solaris_h
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39 | #ifndef RT_WITHOUT_PRAGMA_ONCE
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40 | # pragma once
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41 | #endif
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42 |
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43 | #include "the-solaris-kernel.h"
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44 |
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45 | #include <iprt/err.h>
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46 | #include <iprt/string.h>
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47 | #include <iprt/time.h>
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48 |
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49 |
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50 | /** The resolution (nanoseconds) specified when using timeout_generic. */
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51 | #define RTR0SEMSOLWAIT_RESOLUTION 50000
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52 |
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53 | /** Disables the cyclic fallback code for old S10 installs - see @bugref{5342}.
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54 | * @todo Fixed by @bugref{5595}, can be reenabled after checking out
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55 | * CY_HIGH_LEVEL. */
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56 | #define RTR0SEMSOLWAIT_NO_OLD_S10_FALLBACK
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57 |
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58 | #define SOL_THREAD_TINTR_PTR ((kthread_t **)((char *)curthread + g_offrtSolThreadIntrThread))
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59 |
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60 |
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61 | /**
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62 | * Solaris semaphore wait structure.
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63 | */
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64 | typedef struct RTR0SEMSOLWAIT
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65 | {
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66 | /** The absolute timeout given as nanoseconds since the start of the
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67 | * monotonic clock. */
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68 | uint64_t uNsAbsTimeout;
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69 | /** The timeout in nanoseconds relative to the start of the wait. */
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70 | uint64_t cNsRelTimeout;
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71 | /** The native timeout value. */
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72 | union
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73 | {
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74 | /** The timeout (in ticks) when fHighRes is false. */
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75 | clock_t lTimeout;
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76 | } u;
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77 | /** Set if we use high resolution timeouts. */
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78 | bool fHighRes;
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79 | /** Set if it's an indefinite wait. */
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80 | bool fIndefinite;
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81 | /** Set if the waiting thread is ready to be woken up.
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82 | * Avoids false setrun() calls due to temporary mutex exits. */
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83 | bool volatile fWantWakeup;
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84 | /** Set if we've already timed out.
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85 | * Set by rtR0SemSolWaitDoIt or rtR0SemSolWaitHighResTimeout, read by
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86 | * rtR0SemSolWaitHasTimedOut. */
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87 | bool volatile fTimedOut;
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88 | /** Whether the wait was interrupted. */
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89 | bool fInterrupted;
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90 | /** Interruptible or uninterruptible wait. */
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91 | bool fInterruptible;
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92 | /** The thread to wake up. */
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93 | kthread_t *pThread;
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94 | #ifndef RTR0SEMSOLWAIT_NO_OLD_S10_FALLBACK
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95 | /** Cylic timer ID (used by the timeout callback). */
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96 | cyclic_id_t idCy;
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97 | #endif
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98 | /** The mutex associated with the condition variable wait. */
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99 | void volatile *pvMtx;
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100 | } RTR0SEMSOLWAIT;
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101 | /** Pointer to a solaris semaphore wait structure. */
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102 | typedef RTR0SEMSOLWAIT *PRTR0SEMSOLWAIT;
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103 |
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104 |
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105 | /**
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106 | * Initializes a wait.
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107 | *
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108 | * The caller MUST check the wait condition BEFORE calling this function or the
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109 | * timeout logic will be flawed.
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110 | *
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111 | * @returns VINF_SUCCESS or VERR_TIMEOUT.
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112 | * @param pWait The wait structure.
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113 | * @param fFlags The wait flags.
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114 | * @param uTimeout The timeout.
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115 | */
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116 | DECLINLINE(int) rtR0SemSolWaitInit(PRTR0SEMSOLWAIT pWait, uint32_t fFlags, uint64_t uTimeout)
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117 | {
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118 | /*
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119 | * Process the flags and timeout.
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120 | */
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121 | if (!(fFlags & RTSEMWAIT_FLAGS_INDEFINITE))
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122 | {
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123 | if (fFlags & RTSEMWAIT_FLAGS_MILLISECS)
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124 | uTimeout = uTimeout < UINT64_MAX / RT_NS_1MS
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125 | ? uTimeout * RT_NS_1MS
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126 | : UINT64_MAX;
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127 | if (uTimeout == UINT64_MAX)
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128 | fFlags |= RTSEMWAIT_FLAGS_INDEFINITE;
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129 | else
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130 | {
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131 | uint64_t u64Now;
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132 | if (fFlags & RTSEMWAIT_FLAGS_RELATIVE)
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133 | {
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134 | if (uTimeout == 0)
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135 | return VERR_TIMEOUT;
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136 |
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137 | u64Now = RTTimeSystemNanoTS();
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138 | pWait->cNsRelTimeout = uTimeout;
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139 | pWait->uNsAbsTimeout = u64Now + uTimeout;
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140 | if (pWait->uNsAbsTimeout < u64Now) /* overflow */
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141 | fFlags |= RTSEMWAIT_FLAGS_INDEFINITE;
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142 | }
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143 | else
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144 | {
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145 | u64Now = RTTimeSystemNanoTS();
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146 | if (u64Now >= uTimeout)
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147 | return VERR_TIMEOUT;
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148 |
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149 | pWait->cNsRelTimeout = uTimeout - u64Now;
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150 | pWait->uNsAbsTimeout = uTimeout;
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151 | }
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152 | }
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153 | }
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154 |
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155 | if (!(fFlags & RTSEMWAIT_FLAGS_INDEFINITE))
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156 | {
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157 | pWait->fIndefinite = false;
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158 | if ( ( (fFlags & (RTSEMWAIT_FLAGS_NANOSECS | RTSEMWAIT_FLAGS_ABSOLUTE))
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159 | || pWait->cNsRelTimeout < UINT32_C(1000000000) / 100 /*Hz*/ * 4)
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160 | #ifdef RTR0SEMSOLWAIT_NO_OLD_S10_FALLBACK
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161 | && g_pfnrtR0Sol_timeout_generic != NULL
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162 | #endif
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163 | )
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164 | pWait->fHighRes = true;
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165 | else
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166 | {
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167 | uint64_t cTicks = NSEC_TO_TICK_ROUNDUP(uTimeout);
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168 | if (cTicks >= LONG_MAX)
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169 | fFlags |= RTSEMWAIT_FLAGS_INDEFINITE;
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170 | else
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171 | {
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172 | pWait->u.lTimeout = cTicks;
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173 | pWait->fHighRes = false;
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174 | }
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175 | }
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176 | }
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177 |
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178 | if (fFlags & RTSEMWAIT_FLAGS_INDEFINITE)
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179 | {
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180 | pWait->fIndefinite = true;
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181 | pWait->fHighRes = false;
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182 | pWait->uNsAbsTimeout = UINT64_MAX;
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183 | pWait->cNsRelTimeout = UINT64_MAX;
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184 | pWait->u.lTimeout = LONG_MAX;
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185 | }
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186 |
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187 | pWait->fWantWakeup = false;
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188 | pWait->fTimedOut = false;
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189 | pWait->fInterrupted = false;
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190 | pWait->fInterruptible = !!(fFlags & RTSEMWAIT_FLAGS_INTERRUPTIBLE);
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191 | pWait->pThread = curthread;
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192 | pWait->pvMtx = NULL;
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193 | #ifndef RTR0SEMSOLWAIT_NO_OLD_S10_FALLBACK
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194 | pWait->idCy = CYCLIC_NONE;
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195 | #endif
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196 |
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197 | return VINF_SUCCESS;
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198 | }
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199 |
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200 |
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201 | #ifndef RTR0SEMSOLWAIT_NO_OLD_S10_FALLBACK
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202 | /**
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203 | * Cyclic timeout callback that sets the timeout indicator and wakes up the
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204 | * waiting thread.
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205 | *
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206 | * @param pvUser The wait structure.
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207 | */
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208 | static void rtR0SemSolWaitHighResTimeout(void *pvUser)
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209 | {
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210 | PRTR0SEMSOLWAIT pWait = (PRTR0SEMSOLWAIT)pvUser;
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211 | kthread_t *pThread = pWait->pThread;
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212 | kmutex_t *pMtx = (kmutex_t *)ASMAtomicReadPtr(&pWait->pvMtx);
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213 | if (RT_VALID_PTR(pMtx))
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214 | {
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215 | /* Enter the mutex here to make sure the thread has gone to sleep
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216 | before we wake it up.
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217 | Note: Trying to take the cpu_lock here doesn't work. */
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218 | mutex_enter(pMtx);
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219 | if (mutex_owner(&cpu_lock) == curthread)
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220 | {
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221 | cyclic_remove(pWait->idCy);
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222 | pWait->idCy = CYCLIC_NONE;
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223 | }
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224 | bool const fWantWakeup = pWait->fWantWakeup;
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225 | ASMAtomicWriteBool(&pWait->fTimedOut, true);
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226 | mutex_exit(pMtx);
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227 |
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228 | if (fWantWakeup)
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229 | setrun(pThread);
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230 | }
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231 | }
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232 | #endif
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233 |
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234 |
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235 | /**
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236 | * Timeout callback that sets the timeout indicator and wakes up the waiting
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237 | * thread.
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238 | *
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239 | * @param pvUser The wait structure.
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240 | */
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241 | static void rtR0SemSolWaitTimeout(void *pvUser)
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242 | {
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243 | PRTR0SEMSOLWAIT pWait = (PRTR0SEMSOLWAIT)pvUser;
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244 | kthread_t *pThread = pWait->pThread;
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245 | kmutex_t *pMtx = (kmutex_t *)ASMAtomicReadPtr((void * volatile *)&pWait->pvMtx);
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246 | if (RT_VALID_PTR(pMtx))
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247 | {
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248 | /* Enter the mutex here to make sure the thread has gone to sleep
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249 | before we wake it up. */
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250 | mutex_enter(pMtx);
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251 | bool const fWantWakeup = pWait->fWantWakeup;
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252 | ASMAtomicWriteBool(&pWait->fTimedOut, true);
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253 | mutex_exit(pMtx);
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254 |
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255 | if (fWantWakeup)
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256 | setrun(pThread);
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257 | }
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258 | }
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259 |
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260 |
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261 | /**
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262 | * Do the actual wait.
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263 | *
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264 | * @param pWait The wait structure.
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265 | * @param pCnd The condition variable to wait on.
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266 | * @param pMtx The mutex related to the condition variable.
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267 | * The caller has entered this.
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268 | * @param pfState The state variable to check if have changed
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269 | * after leaving the mutex (spinlock).
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270 | * @param fCurState The current value of @a pfState. We'll return
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271 | * without sleeping if @a pfState doesn't hold
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272 | * this value after reacquiring the mutex.
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273 | *
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274 | * @remarks This must be call with the object mutex (spinlock) held.
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275 | */
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276 | DECLINLINE(void) rtR0SemSolWaitDoIt(PRTR0SEMSOLWAIT pWait, kcondvar_t *pCnd, kmutex_t *pMtx,
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277 | uint32_t volatile *pfState, uint32_t const fCurState)
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278 | {
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279 | union
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280 | {
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281 | callout_id_t idCo;
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282 | timeout_id_t idTom;
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283 | } u;
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284 |
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285 | u.idCo = 0; /* Silence a spurious gcc [-Wmaybe-uninitialized] warning. */
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286 |
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287 | /*
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288 | * Arm the timeout callback.
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289 | *
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290 | * We will have to leave the mutex (spinlock) when doing this because S10
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291 | * (didn't check S11) will not correctly preserve PIL across calls to
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292 | * timeout_generic() - @bugref{5595}. We do it for all timeout methods to
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293 | * be on the safe side, the nice sideeffect of which is that it solves the
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294 | * lock inversion problem found in @bugref{5342}.
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295 | */
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296 | bool const fHasTimeout = !pWait->fIndefinite;
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297 | bool fGoToSleep = !fHasTimeout;
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298 | if (fHasTimeout)
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299 | {
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300 | pWait->fWantWakeup = false; /* only want fTimedOut */
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301 | ASMAtomicWritePtr(&pWait->pvMtx, pMtx); /* atomic is paranoia */
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302 | mutex_exit(pMtx);
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303 |
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304 | if (pWait->fHighRes)
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305 | {
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306 | #ifndef RTR0SEMSOLWAIT_NO_OLD_S10_FALLBACK
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307 | if (g_pfnrtR0Sol_timeout_generic != NULL)
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308 | #endif
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309 | {
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310 | /*
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311 | * High resolution timeout - arm a high resolution timeout callback
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312 | * for waking up the thread at the desired time.
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313 | */
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314 | u.idCo = g_pfnrtR0Sol_timeout_generic(CALLOUT_REALTIME, rtR0SemSolWaitTimeout, pWait,
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315 | pWait->uNsAbsTimeout, RTR0SEMSOLWAIT_RESOLUTION,
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316 | CALLOUT_FLAG_ABSOLUTE);
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317 | }
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318 | #ifndef RTR0SEMSOLWAIT_NO_OLD_S10_FALLBACK
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319 | else
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320 | {
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321 | /*
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322 | * High resolution timeout - arm a one-shot cyclic for waking up
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323 | * the thread at the desired time.
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324 | */
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325 | cyc_handler_t Cyh;
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326 | Cyh.cyh_arg = pWait;
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327 | Cyh.cyh_func = rtR0SemSolWaitHighResTimeout;
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328 | Cyh.cyh_level = CY_LOW_LEVEL; /// @todo try CY_LOCK_LEVEL and CY_HIGH_LEVEL?
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329 |
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330 | cyc_time_t Cyt;
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331 | Cyt.cyt_when = pWait->uNsAbsTimeout;
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332 | Cyt.cyt_interval = UINT64_C(1000000000) * 60;
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333 |
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334 | mutex_enter(&cpu_lock);
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335 | pWait->idCy = cyclic_add(&Cyh, &Cyt);
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336 | mutex_exit(&cpu_lock);
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337 | }
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338 | #endif
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339 | }
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340 | else
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341 | {
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342 | /*
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343 | * Normal timeout.
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344 | * We're better off with our own callback like on the timeout man page,
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345 | * than calling cv_timedwait[_sig]().
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346 | */
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347 | u.idTom = realtime_timeout(rtR0SemSolWaitTimeout, pWait, pWait->u.lTimeout);
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348 | }
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349 |
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350 | /*
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351 | * Reacquire the mutex and check if the sleep condition still holds and
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352 | * that we didn't already time out.
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353 | */
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354 | mutex_enter(pMtx);
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355 | pWait->fWantWakeup = true;
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356 | fGoToSleep = !ASMAtomicUoReadBool(&pWait->fTimedOut)
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357 | && ASMAtomicReadU32(pfState) == fCurState;
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358 | }
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359 |
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360 | /*
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361 | * Do the waiting if that's still desirable.
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362 | * (rc > 0 - normal wake-up; rc == 0 - interruption; rc == -1 - timeout)
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363 | */
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364 | if (fGoToSleep)
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365 | {
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366 | if (pWait->fInterruptible)
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367 | {
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368 | int rc = cv_wait_sig(pCnd, pMtx);
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369 | if (RT_UNLIKELY(rc <= 0))
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370 | {
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371 | if (RT_LIKELY(rc == 0))
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372 | pWait->fInterrupted = true;
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373 | else
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374 | AssertMsgFailed(("rc=%d\n", rc)); /* no timeouts, see above! */
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375 | }
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376 | }
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377 | else
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378 | cv_wait(pCnd, pMtx);
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379 | }
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380 |
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381 | /*
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382 | * Remove the timeout callback. Drop the lock while we're doing that
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383 | * to reduce lock contention / deadlocks. Before dropping the lock,
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384 | * indicate that the callback shouldn't do anything.
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385 | *
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386 | * (Too bad we are stuck with the cv_* API here, it's doing a little
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387 | * bit too much.)
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388 | */
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389 | if (fHasTimeout)
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390 | {
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391 | pWait->fWantWakeup = false;
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392 | ASMAtomicWritePtr(&pWait->pvMtx, NULL);
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393 | mutex_exit(pMtx);
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394 |
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395 | if (pWait->fHighRes)
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396 | {
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397 | #ifndef RTR0SEMSOLWAIT_NO_OLD_S10_FALLBACK
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398 | if (g_pfnrtR0Sol_timeout_generic != NULL)
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399 | #endif
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400 | g_pfnrtR0Sol_untimeout_generic(u.idCo, 0 /*nowait*/);
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401 | #ifndef RTR0SEMSOLWAIT_NO_OLD_S10_FALLBACK
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402 | else
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403 | {
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404 | mutex_enter(&cpu_lock);
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405 | if (pWait->idCy != CYCLIC_NONE)
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406 | {
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407 | cyclic_remove(pWait->idCy);
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408 | pWait->idCy = CYCLIC_NONE;
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409 | }
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410 | mutex_exit(&cpu_lock);
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411 | }
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412 | #endif
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413 | }
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414 | else
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415 | untimeout(u.idTom);
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416 |
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417 | mutex_enter(pMtx);
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418 | }
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419 | }
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420 |
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421 |
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422 | /**
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423 | * Checks if a solaris wait was interrupted.
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424 | *
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425 | * @returns true / false
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426 | * @param pWait The wait structure.
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427 | * @remarks This shall be called before the first rtR0SemSolWaitDoIt().
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428 | */
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429 | DECLINLINE(bool) rtR0SemSolWaitWasInterrupted(PRTR0SEMSOLWAIT pWait)
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430 | {
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431 | return pWait->fInterrupted;
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432 | }
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433 |
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434 |
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435 | /**
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436 | * Checks if a solaris wait has timed out.
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437 | *
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438 | * @returns true / false
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439 | * @param pWait The wait structure.
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440 | */
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441 | DECLINLINE(bool) rtR0SemSolWaitHasTimedOut(PRTR0SEMSOLWAIT pWait)
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442 | {
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443 | return pWait->fTimedOut;
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444 | }
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445 |
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446 |
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447 | /**
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448 | * Deletes a solaris wait.
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449 | *
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450 | * @param pWait The wait structure.
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451 | */
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452 | DECLINLINE(void) rtR0SemSolWaitDelete(PRTR0SEMSOLWAIT pWait)
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453 | {
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454 | pWait->pThread = NULL;
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455 | }
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456 |
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457 |
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458 | /**
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459 | * Enters the mutex, unpinning the underlying current thread if contended and
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460 | * we're on an interrupt thread.
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461 | *
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462 | * The unpinning is done to prevent a deadlock, see s this could lead to a
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463 | * deadlock (see @bugref{4259} for the full explanation)
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464 | *
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465 | * @param pMtx The mutex to enter.
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466 | */
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467 | DECLINLINE(void) rtR0SemSolWaitEnterMutexWithUnpinningHack(kmutex_t *pMtx)
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468 | {
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469 | int fAcquired = mutex_tryenter(pMtx);
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470 | if (!fAcquired)
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471 | {
|
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472 | /*
|
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473 | * Note! This assumes nobody is using the RTThreadPreemptDisable() in an
|
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474 | * interrupt context and expects it to work right. The swtch will
|
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475 | * result in a voluntary preemption. To fix this, we would have to
|
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476 | * do our own counting in RTThreadPreemptDisable/Restore() like we do
|
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477 | * on systems which doesn't do preemption (OS/2, linux, ...) and
|
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478 | * check whether preemption was disabled via RTThreadPreemptDisable()
|
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479 | * or not and only call swtch if RTThreadPreemptDisable() wasn't called.
|
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480 | */
|
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481 | kthread_t **ppIntrThread = SOL_THREAD_TINTR_PTR;
|
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482 | if ( *ppIntrThread
|
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483 | && getpil() < DISP_LEVEL)
|
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484 | {
|
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485 | RTTHREADPREEMPTSTATE PreemptState = RTTHREADPREEMPTSTATE_INITIALIZER;
|
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486 | RTThreadPreemptDisable(&PreemptState);
|
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487 | preempt();
|
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488 | RTThreadPreemptRestore(&PreemptState);
|
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489 | }
|
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490 | mutex_enter(pMtx);
|
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491 | }
|
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492 | }
|
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493 |
|
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494 |
|
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495 | /**
|
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496 | * Gets the max resolution of the timeout machinery.
|
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497 | *
|
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498 | * @returns Resolution specified in nanoseconds.
|
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499 | */
|
---|
500 | DECLINLINE(uint32_t) rtR0SemSolWaitGetResolution(void)
|
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501 | {
|
---|
502 | return g_pfnrtR0Sol_timeout_generic != NULL
|
---|
503 | ? RTR0SEMSOLWAIT_RESOLUTION
|
---|
504 | : cyclic_getres();
|
---|
505 | }
|
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506 |
|
---|
507 | #endif /* !IPRT_INCLUDED_SRC_r0drv_solaris_semeventwait_r0drv_solaris_h */
|
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508 |
|
---|