1 | /* $Id: sched-posix.cpp 48935 2013-10-07 21:19:37Z vboxsync $ */
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2 | /** @file
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3 | * IPRT - Scheduling, POSIX.
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4 | */
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5 |
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6 | /*
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7 | * Copyright (C) 2006-2011 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 | * !WARNING!
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29 | *
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30 | * When talking about lowering and raising priority, we do *NOT* refer to
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31 | * the common direction priority values takes on unix systems (lower means
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32 | * higher). So, when we raise the priority of a linux thread the nice
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33 | * value will decrease, and when we lower the priority the nice value
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34 | * will increase. Confusing, right?
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35 | *
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36 | * !WARNING!
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37 | */
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38 |
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39 |
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40 |
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41 | /** @def THREAD_LOGGING
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42 | * Be very careful with enabling this, it may cause deadlocks when combined
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43 | * with the 'thread' logging prefix.
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44 | */
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45 | #ifdef DOXYGEN_RUNNING
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46 | #define THREAD_LOGGING
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47 | #endif
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48 |
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49 | /*******************************************************************************
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50 | * Header Files *
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51 | *******************************************************************************/
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52 | #define LOG_GROUP RTLOGGROUP_THREAD
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53 | #include <errno.h>
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54 | #include <pthread.h>
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55 | #include <sched.h>
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56 | #include <unistd.h>
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57 | #include <sys/resource.h>
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58 |
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59 | #include <iprt/thread.h>
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60 | #include <iprt/process.h>
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61 | #include <iprt/semaphore.h>
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62 | #include <iprt/string.h>
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63 | #include <iprt/assert.h>
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64 | #include <iprt/log.h>
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65 | #include <iprt/err.h>
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66 | #include "internal/sched.h"
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67 | #include "internal/thread.h"
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68 |
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69 |
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70 | /*******************************************************************************
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71 | * Structures and Typedefs *
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72 | *******************************************************************************/
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73 |
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74 | /** Array scheduler attributes corresponding to each of the thread types. */
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75 | typedef struct PROCPRIORITYTYPE
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76 | {
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77 | /** For sanity include the array index. */
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78 | RTTHREADTYPE enmType;
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79 | /** The thread priority or nice delta - depends on which priority type. */
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80 | int iPriority;
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81 | } PROCPRIORITYTYPE;
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82 |
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83 |
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84 | /**
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85 | * Configuration of one priority.
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86 | */
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87 | typedef struct
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88 | {
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89 | /** The priority. */
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90 | RTPROCPRIORITY enmPriority;
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91 | /** The name of this priority. */
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92 | const char *pszName;
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93 | /** The process nice value. */
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94 | int iNice;
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95 | /** The delta applied to the iPriority value. */
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96 | int iDelta;
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97 | /** Array scheduler attributes corresponding to each of the thread types. */
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98 | const PROCPRIORITYTYPE *paTypes;
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99 | } PROCPRIORITY;
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100 |
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101 |
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102 | /**
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103 | * Saved priority settings
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104 | */
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105 | typedef struct
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106 | {
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107 | /** Process priority. */
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108 | int iPriority;
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109 | /** Process level. */
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110 | struct sched_param SchedParam;
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111 | /** Process level. */
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112 | int iPolicy;
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113 | /** pthread level. */
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114 | struct sched_param PthreadSchedParam;
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115 | /** pthread level. */
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116 | int iPthreadPolicy;
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117 | } SAVEDPRIORITY, *PSAVEDPRIORITY;
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118 |
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119 |
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120 | /*******************************************************************************
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121 | * Global Variables *
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122 | *******************************************************************************/
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123 | /**
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124 | * Thread level priorities based on a 0..31 priority range
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125 | * as specified as the minimum for SCHED_RR/FIFO. FreeBSD
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126 | * seems to be using this (needs more research to be
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127 | * certain).
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128 | */
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129 | static const PROCPRIORITYTYPE g_aTypesThread[RTTHREADTYPE_END] =
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130 | {
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131 | { RTTHREADTYPE_INVALID, -999999999 },
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132 | { RTTHREADTYPE_INFREQUENT_POLLER, 5 },
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133 | { RTTHREADTYPE_MAIN_HEAVY_WORKER, 12 },
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134 | { RTTHREADTYPE_EMULATION, 14 },
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135 | { RTTHREADTYPE_DEFAULT, 15 },
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136 | { RTTHREADTYPE_GUI, 16 },
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137 | { RTTHREADTYPE_MAIN_WORKER, 18 },
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138 | { RTTHREADTYPE_VRDP_IO, 24 },
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139 | { RTTHREADTYPE_DEBUGGER, 28 },
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140 | { RTTHREADTYPE_MSG_PUMP, 29 },
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141 | { RTTHREADTYPE_IO, 30 },
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142 | { RTTHREADTYPE_TIMER, 31 }
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143 | };
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144 |
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145 | static const PROCPRIORITYTYPE g_aTypesThreadFlat[RTTHREADTYPE_END] =
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146 | {
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147 | { RTTHREADTYPE_INVALID, ~0 },
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148 | { RTTHREADTYPE_INFREQUENT_POLLER, 15 },
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149 | { RTTHREADTYPE_MAIN_HEAVY_WORKER, 15 },
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150 | { RTTHREADTYPE_EMULATION, 15 },
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151 | { RTTHREADTYPE_DEFAULT, 15 },
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152 | { RTTHREADTYPE_GUI, 15 },
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153 | { RTTHREADTYPE_MAIN_WORKER, 15 },
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154 | { RTTHREADTYPE_VRDP_IO, 15 },
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155 | { RTTHREADTYPE_DEBUGGER, 15 },
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156 | { RTTHREADTYPE_MSG_PUMP, 15 },
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157 | { RTTHREADTYPE_IO, 15 },
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158 | { RTTHREADTYPE_TIMER, 15 }
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159 | };
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160 |
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161 | /**
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162 | * Process and thread level priority, full access at thread level.
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163 | */
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164 | static const PROCPRIORITY g_aProcessAndThread[] =
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165 | {
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166 | { RTPROCPRIORITY_FLAT, "Flat", 0, 0, g_aTypesThreadFlat },
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167 | { RTPROCPRIORITY_LOW, "Low", 9, 0, g_aTypesThread },
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168 | { RTPROCPRIORITY_LOW, "Low", 11, 0, g_aTypesThread },
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169 | { RTPROCPRIORITY_LOW, "Low", 15, 0, g_aTypesThread },
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170 | { RTPROCPRIORITY_LOW, "Low", 17, 0, g_aTypesThread },
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171 | { RTPROCPRIORITY_LOW, "Low", 19, 0, g_aTypesThread },
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172 | { RTPROCPRIORITY_LOW, "Low", 7, 0, g_aTypesThread },
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173 | { RTPROCPRIORITY_LOW, "Low", 5, 0, g_aTypesThread },
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174 | { RTPROCPRIORITY_LOW, "Low", 3, 0, g_aTypesThread },
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175 | { RTPROCPRIORITY_LOW, "Low", 1, 0, g_aTypesThread },
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176 | { RTPROCPRIORITY_NORMAL, "Normal", 0, 0, g_aTypesThread },
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177 | { RTPROCPRIORITY_NORMAL, "Normal", 0, 0, g_aTypesThreadFlat },
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178 | { RTPROCPRIORITY_HIGH, "High", -9, 0, g_aTypesThread },
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179 | { RTPROCPRIORITY_HIGH, "High", -7, 0, g_aTypesThread },
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180 | { RTPROCPRIORITY_HIGH, "High", -5, 0, g_aTypesThread },
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181 | { RTPROCPRIORITY_HIGH, "High", -3, 0, g_aTypesThread },
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182 | { RTPROCPRIORITY_HIGH, "High", -1, 0, g_aTypesThread },
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183 | { RTPROCPRIORITY_HIGH, "High", -9, 0, g_aTypesThreadFlat },
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184 | { RTPROCPRIORITY_HIGH, "High", -1, 0, g_aTypesThreadFlat }
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185 | };
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186 |
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187 | /**
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188 | * Deltas for a process in which we are not restricted
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189 | * to only be lowering the priority.
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190 | */
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191 | static const PROCPRIORITYTYPE g_aTypesUnixFree[RTTHREADTYPE_END] =
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192 | {
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193 | { RTTHREADTYPE_INVALID, -999999999 },
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194 | { RTTHREADTYPE_INFREQUENT_POLLER, +3 },
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195 | { RTTHREADTYPE_MAIN_HEAVY_WORKER, +2 },
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196 | { RTTHREADTYPE_EMULATION, +1 },
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197 | { RTTHREADTYPE_DEFAULT, 0 },
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198 | { RTTHREADTYPE_GUI, 0 },
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199 | { RTTHREADTYPE_MAIN_WORKER, 0 },
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200 | { RTTHREADTYPE_VRDP_IO, -1 },
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201 | { RTTHREADTYPE_DEBUGGER, -1 },
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202 | { RTTHREADTYPE_MSG_PUMP, -2 },
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203 | { RTTHREADTYPE_IO, -3 },
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204 | { RTTHREADTYPE_TIMER, -4 }
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205 | };
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206 |
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207 | /**
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208 | * Deltas for a process in which we are restricted
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209 | * to only be lowering the priority.
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210 | */
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211 | static const PROCPRIORITYTYPE g_aTypesUnixRestricted[RTTHREADTYPE_END] =
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212 | {
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213 | { RTTHREADTYPE_INVALID, -999999999 },
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214 | { RTTHREADTYPE_INFREQUENT_POLLER, +3 },
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215 | { RTTHREADTYPE_MAIN_HEAVY_WORKER, +2 },
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216 | { RTTHREADTYPE_EMULATION, +1 },
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217 | { RTTHREADTYPE_DEFAULT, 0 },
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218 | { RTTHREADTYPE_GUI, 0 },
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219 | { RTTHREADTYPE_MAIN_WORKER, 0 },
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220 | { RTTHREADTYPE_VRDP_IO, 0 },
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221 | { RTTHREADTYPE_DEBUGGER, 0 },
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222 | { RTTHREADTYPE_MSG_PUMP, 0 },
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223 | { RTTHREADTYPE_IO, 0 },
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224 | { RTTHREADTYPE_TIMER, 0 }
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225 | };
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226 |
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227 | /**
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228 | * Deltas for a process in which we are restricted
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229 | * to only be lowering the priority.
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230 | */
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231 | static const PROCPRIORITYTYPE g_aTypesUnixFlat[RTTHREADTYPE_END] =
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232 | {
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233 | { RTTHREADTYPE_INVALID, -999999999 },
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234 | { RTTHREADTYPE_INFREQUENT_POLLER, 0 },
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235 | { RTTHREADTYPE_MAIN_HEAVY_WORKER, 0 },
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236 | { RTTHREADTYPE_EMULATION, 0 },
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237 | { RTTHREADTYPE_DEFAULT, 0 },
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238 | { RTTHREADTYPE_GUI, 0 },
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239 | { RTTHREADTYPE_MAIN_WORKER, 0 },
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240 | { RTTHREADTYPE_VRDP_IO, 0 },
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241 | { RTTHREADTYPE_DEBUGGER, 0 },
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242 | { RTTHREADTYPE_MSG_PUMP, 0 },
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243 | { RTTHREADTYPE_IO, 0 },
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244 | { RTTHREADTYPE_TIMER, 0 }
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245 | };
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246 |
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247 | /**
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248 | * Process and thread level priority, full access at thread level.
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249 | */
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250 | static const PROCPRIORITY g_aUnixConfigs[] =
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251 | {
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252 | { RTPROCPRIORITY_FLAT, "Flat", 0, 0, g_aTypesUnixFlat },
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253 | { RTPROCPRIORITY_LOW, "Low", 9, 9, g_aTypesUnixFree },
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254 | { RTPROCPRIORITY_LOW, "Low", 9, 9, g_aTypesUnixFlat },
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255 | { RTPROCPRIORITY_LOW, "Low", 15, 15, g_aTypesUnixFree },
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256 | { RTPROCPRIORITY_LOW, "Low", 15, 15, g_aTypesUnixFlat },
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257 | { RTPROCPRIORITY_LOW, "Low", 17, 17, g_aTypesUnixFree },
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258 | { RTPROCPRIORITY_LOW, "Low", 17, 17, g_aTypesUnixFlat },
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259 | { RTPROCPRIORITY_LOW, "Low", 19, 19, g_aTypesUnixFlat },
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260 | { RTPROCPRIORITY_LOW, "Low", 9, 9, g_aTypesUnixRestricted },
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261 | { RTPROCPRIORITY_LOW, "Low", 15, 15, g_aTypesUnixRestricted },
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262 | { RTPROCPRIORITY_LOW, "Low", 17, 17, g_aTypesUnixRestricted },
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263 | { RTPROCPRIORITY_NORMAL, "Normal", 0, 0, g_aTypesUnixFree },
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264 | { RTPROCPRIORITY_NORMAL, "Normal", 0, 0, g_aTypesUnixRestricted },
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265 | { RTPROCPRIORITY_NORMAL, "Normal", 0, 0, g_aTypesUnixFlat },
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266 | { RTPROCPRIORITY_HIGH, "High", -9, -9, g_aTypesUnixFree },
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267 | { RTPROCPRIORITY_HIGH, "High", -7, -7, g_aTypesUnixFree },
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268 | { RTPROCPRIORITY_HIGH, "High", -5, -5, g_aTypesUnixFree },
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269 | { RTPROCPRIORITY_HIGH, "High", -3, -3, g_aTypesUnixFree },
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270 | { RTPROCPRIORITY_HIGH, "High", -1, -1, g_aTypesUnixFree },
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271 | { RTPROCPRIORITY_HIGH, "High", -9, -9, g_aTypesUnixRestricted },
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272 | { RTPROCPRIORITY_HIGH, "High", -7, -7, g_aTypesUnixRestricted },
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273 | { RTPROCPRIORITY_HIGH, "High", -5, -5, g_aTypesUnixRestricted },
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274 | { RTPROCPRIORITY_HIGH, "High", -3, -3, g_aTypesUnixRestricted },
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275 | { RTPROCPRIORITY_HIGH, "High", -1, -1, g_aTypesUnixRestricted },
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276 | { RTPROCPRIORITY_HIGH, "High", -9, -9, g_aTypesUnixFlat },
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277 | { RTPROCPRIORITY_HIGH, "High", -7, -7, g_aTypesUnixFlat },
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278 | { RTPROCPRIORITY_HIGH, "High", -5, -5, g_aTypesUnixFlat },
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279 | { RTPROCPRIORITY_HIGH, "High", -3, -3, g_aTypesUnixFlat },
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280 | { RTPROCPRIORITY_HIGH, "High", -1, -1, g_aTypesUnixFlat }
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281 | };
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282 |
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283 | /**
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284 | * The dynamic default priority configuration.
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285 | *
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286 | * This will be recalulated at runtime depending on what the
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287 | * system allow us to do and what the current priority is.
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288 | */
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289 | static PROCPRIORITY g_aDefaultPriority =
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290 | {
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291 | RTPROCPRIORITY_LOW, "Default", 0, 0, g_aTypesUnixRestricted
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292 | };
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293 |
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294 | /** Pointer to the current priority configuration. */
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295 | static const PROCPRIORITY *g_pProcessPriority = &g_aDefaultPriority;
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296 |
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297 |
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298 | /** Set to what kind of scheduling priority support the host
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299 | * OS seems to be offering. Determined at runtime.
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300 | */
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301 | static enum
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302 | {
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303 | OSPRIOSUP_UNDETERMINED = 0,
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304 | /** An excellent combination of process and thread level
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305 | * I.e. setpriority() works on process level, one have to be supervisor
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306 | * to raise priority as is the custom in unix. While pthread_setschedparam()
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307 | * works on thread level and we can raise the priority just like we want.
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308 | *
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309 | * I think this is what FreeBSD offers. (It is certainly analogous to what
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310 | * NT offers if you wondered.) Linux on the other hand doesn't provide this
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311 | * for processes with SCHED_OTHER policy, and I'm not sure if we want to
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312 | * play around with using the real-time SCHED_RR and SCHED_FIFO which would
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313 | * require special privileges anyway.
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314 | */
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315 | OSPRIOSUP_PROCESS_AND_THREAD_LEVEL,
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316 | /** A rough thread level priority only.
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317 | * setpriority() is the only real game in town, and it works on thread level.
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318 | */
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319 | OSPRIOSUP_THREAD_LEVEL
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320 | } volatile g_enmOsPrioSup = OSPRIOSUP_UNDETERMINED;
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321 |
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322 | /** Set if we figure we have nice capability, meaning we can use setpriority
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323 | * to raise the priority. */
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324 | bool g_fCanNice = false;
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325 |
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326 |
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327 | /*******************************************************************************
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328 | * Internal Functions *
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329 | *******************************************************************************/
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330 |
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331 |
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332 | /**
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333 | * Saves all the scheduling attributes we can think of.
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334 | */
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335 | static void rtSchedNativeSave(PSAVEDPRIORITY pSave)
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336 | {
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337 | memset(pSave, 0xff, sizeof(*pSave));
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338 |
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339 | errno = 0;
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340 | pSave->iPriority = getpriority(PRIO_PROCESS, 0 /* current process */);
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341 | Assert(errno == 0);
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342 |
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343 | errno = 0;
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344 | sched_getparam(0 /* current process */, &pSave->SchedParam);
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345 | Assert(errno == 0);
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346 |
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347 | errno = 0;
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348 | pSave->iPolicy = sched_getscheduler(0 /* current process */);
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349 | Assert(errno == 0);
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350 |
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351 | int rc = pthread_getschedparam(pthread_self(), &pSave->iPthreadPolicy, &pSave->PthreadSchedParam);
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352 | Assert(rc == 0); NOREF(rc);
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353 | }
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354 |
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355 |
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356 | /**
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357 | * Restores scheduling attributes.
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358 | * Most of this won't work right, but anyway...
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359 | */
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360 | static void rtSchedNativeRestore(PSAVEDPRIORITY pSave)
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361 | {
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362 | setpriority(PRIO_PROCESS, 0, pSave->iPriority);
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363 | sched_setscheduler(0, pSave->iPolicy, &pSave->SchedParam);
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364 | sched_setparam(0, &pSave->SchedParam);
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365 | pthread_setschedparam(pthread_self(), pSave->iPthreadPolicy, &pSave->PthreadSchedParam);
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366 | }
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367 |
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368 |
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369 | /**
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370 | * Starts a worker thread and wait for it to complete.
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371 | * We cannot use RTThreadCreate since we're already owner of the RW lock.
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372 | */
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373 | static int rtSchedCreateThread(void *(*pfnThread)(void *pvArg), void *pvArg)
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374 | {
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375 | /*
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376 | * Setup thread attributes.
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377 | */
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378 | pthread_attr_t ThreadAttr;
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379 | int rc = pthread_attr_init(&ThreadAttr);
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380 | if (!rc)
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381 | {
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382 | rc = pthread_attr_setdetachstate(&ThreadAttr, PTHREAD_CREATE_JOINABLE);
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383 | if (!rc)
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384 | {
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385 | rc = pthread_attr_setstacksize(&ThreadAttr, 128*1024);
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386 | if (!rc)
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387 | {
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388 | /*
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389 | * Create the thread.
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390 | */
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391 | pthread_t Thread;
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392 | rc = pthread_create(&Thread, &ThreadAttr, pfnThread, pvArg);
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393 | if (!rc)
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394 | {
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395 | /*
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396 | * Wait for the thread to finish.
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397 | */
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398 | void *pvRet = (void *)-1;
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399 | do
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400 | {
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401 | rc = pthread_join(Thread, &pvRet);
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402 | } while (errno == EINTR);
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403 | if (rc)
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404 | return RTErrConvertFromErrno(rc);
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405 | return (int)(uintptr_t)pvRet;
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406 | }
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407 | }
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408 | }
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409 | pthread_attr_destroy(&ThreadAttr);
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410 | }
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411 | return RTErrConvertFromErrno(rc);
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412 | }
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413 |
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414 |
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415 | static void rtSchedDumpPriority(void)
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416 | {
|
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417 | #ifdef THREAD_LOGGING
|
---|
418 | Log(("Priority: g_fCanNice=%d g_enmOsPrioSup=%d\n", g_fCanNice, g_enmOsPrioSup));
|
---|
419 | Log(("Priority: enmPriority=%d \"%s\" iNice=%d iDelta=%d\n",
|
---|
420 | g_pProcessPriority->enmPriority,
|
---|
421 | g_pProcessPriority->pszName,
|
---|
422 | g_pProcessPriority->iNice,
|
---|
423 | g_pProcessPriority->iDelta));
|
---|
424 | Log(("Priority: %2d INFREQUENT_POLLER = %d\n", RTTHREADTYPE_INFREQUENT_POLLER, g_pProcessPriority->paTypes[RTTHREADTYPE_INFREQUENT_POLLER].iPriority));
|
---|
425 | Log(("Priority: %2d MAIN_HEAVY_WORKER = %d\n", RTTHREADTYPE_MAIN_HEAVY_WORKER, g_pProcessPriority->paTypes[RTTHREADTYPE_MAIN_HEAVY_WORKER].iPriority));
|
---|
426 | Log(("Priority: %2d EMULATION = %d\n", RTTHREADTYPE_EMULATION , g_pProcessPriority->paTypes[RTTHREADTYPE_EMULATION ].iPriority));
|
---|
427 | Log(("Priority: %2d DEFAULT = %d\n", RTTHREADTYPE_DEFAULT , g_pProcessPriority->paTypes[RTTHREADTYPE_DEFAULT ].iPriority));
|
---|
428 | Log(("Priority: %2d GUI = %d\n", RTTHREADTYPE_GUI , g_pProcessPriority->paTypes[RTTHREADTYPE_GUI ].iPriority));
|
---|
429 | Log(("Priority: %2d MAIN_WORKER = %d\n", RTTHREADTYPE_MAIN_WORKER , g_pProcessPriority->paTypes[RTTHREADTYPE_MAIN_WORKER ].iPriority));
|
---|
430 | Log(("Priority: %2d VRDP_IO = %d\n", RTTHREADTYPE_VRDP_IO , g_pProcessPriority->paTypes[RTTHREADTYPE_VRDP_IO ].iPriority));
|
---|
431 | Log(("Priority: %2d DEBUGGER = %d\n", RTTHREADTYPE_DEBUGGER , g_pProcessPriority->paTypes[RTTHREADTYPE_DEBUGGER ].iPriority));
|
---|
432 | Log(("Priority: %2d MSG_PUMP = %d\n", RTTHREADTYPE_MSG_PUMP , g_pProcessPriority->paTypes[RTTHREADTYPE_MSG_PUMP ].iPriority));
|
---|
433 | Log(("Priority: %2d IO = %d\n", RTTHREADTYPE_IO , g_pProcessPriority->paTypes[RTTHREADTYPE_IO ].iPriority));
|
---|
434 | Log(("Priority: %2d TIMER = %d\n", RTTHREADTYPE_TIMER , g_pProcessPriority->paTypes[RTTHREADTYPE_TIMER ].iPriority));
|
---|
435 | #endif
|
---|
436 | }
|
---|
437 |
|
---|
438 |
|
---|
439 | /**
|
---|
440 | * The prober thread.
|
---|
441 | * We don't want to mess with the priority of the calling thread.
|
---|
442 | *
|
---|
443 | * @remark This is pretty presumptive stuff, but if it works on Linux and
|
---|
444 | * FreeBSD it does what I want.
|
---|
445 | */
|
---|
446 | static void *rtSchedNativeProberThread(void *pvUser)
|
---|
447 | {
|
---|
448 | SAVEDPRIORITY SavedPriority;
|
---|
449 | rtSchedNativeSave(&SavedPriority);
|
---|
450 |
|
---|
451 | /*
|
---|
452 | * Let's first try and see what we get on a thread level.
|
---|
453 | */
|
---|
454 | int iMax = sched_get_priority_max(SavedPriority.iPthreadPolicy);
|
---|
455 | int iMin = sched_get_priority_min(SavedPriority.iPthreadPolicy);
|
---|
456 | if (iMax - iMin >= 32)
|
---|
457 | {
|
---|
458 | pthread_t Self = pthread_self();
|
---|
459 | int i = iMin;
|
---|
460 | while (i <= iMax)
|
---|
461 | {
|
---|
462 | struct sched_param SchedParam = SavedPriority.PthreadSchedParam;
|
---|
463 | SchedParam.sched_priority = i;
|
---|
464 | if (pthread_setschedparam(Self, SavedPriority.iPthreadPolicy, &SchedParam))
|
---|
465 | break;
|
---|
466 | i++;
|
---|
467 | }
|
---|
468 | if (i == iMax)
|
---|
469 | g_enmOsPrioSup = OSPRIOSUP_PROCESS_AND_THREAD_LEVEL;
|
---|
470 | }
|
---|
471 |
|
---|
472 | /*
|
---|
473 | * Ok, we didn't have the good stuff, so let's fall back on the unix stuff.
|
---|
474 | */
|
---|
475 | if (g_enmOsPrioSup == OSPRIOSUP_UNDETERMINED)
|
---|
476 | g_enmOsPrioSup = OSPRIOSUP_THREAD_LEVEL;
|
---|
477 |
|
---|
478 | /*
|
---|
479 | * Check if we can get higher priority (typically only root can do this).
|
---|
480 | * (Won't work right if our priority is -19 to start with, but what the heck.)
|
---|
481 | *
|
---|
482 | * We assume that the unix priority is -19 to 19. I know there are defines
|
---|
483 | * for this, but I don't remember which and if I'm awake enough to make sense
|
---|
484 | * of them from any SuS spec.
|
---|
485 | */
|
---|
486 | int iStart = getpriority(PRIO_PROCESS, 0);
|
---|
487 | int i = iStart;
|
---|
488 | while (i-- > -19)
|
---|
489 | {
|
---|
490 | if (setpriority(PRIO_PROCESS, 0, i))
|
---|
491 | break;
|
---|
492 | }
|
---|
493 | if (getpriority(PRIO_PROCESS, 0) != iStart)
|
---|
494 | g_fCanNice = true;
|
---|
495 | else
|
---|
496 | g_fCanNice = false;
|
---|
497 |
|
---|
498 | /* done */
|
---|
499 | rtSchedNativeRestore(&SavedPriority);
|
---|
500 | return (void *)VINF_SUCCESS;
|
---|
501 | }
|
---|
502 |
|
---|
503 |
|
---|
504 | /**
|
---|
505 | * Calculate the scheduling properties for all the threads in the default
|
---|
506 | * process priority, assuming the current thread have the type enmType.
|
---|
507 | *
|
---|
508 | * @returns iprt status code.
|
---|
509 | * @param enmType The thread type to be assumed for the current thread.
|
---|
510 | */
|
---|
511 | DECLHIDDEN(int) rtSchedNativeCalcDefaultPriority(RTTHREADTYPE enmType)
|
---|
512 | {
|
---|
513 | Assert(enmType > RTTHREADTYPE_INVALID && enmType < RTTHREADTYPE_END);
|
---|
514 |
|
---|
515 | /*
|
---|
516 | * First figure out what's supported by the OS.
|
---|
517 | */
|
---|
518 | if (g_enmOsPrioSup == OSPRIOSUP_UNDETERMINED)
|
---|
519 | {
|
---|
520 | int iPriority = getpriority(PRIO_PROCESS, 0);
|
---|
521 | int rc = rtSchedCreateThread(rtSchedNativeProberThread, NULL);
|
---|
522 | if (RT_FAILURE(rc))
|
---|
523 | return rc;
|
---|
524 | if (g_enmOsPrioSup == OSPRIOSUP_UNDETERMINED)
|
---|
525 | g_enmOsPrioSup = OSPRIOSUP_THREAD_LEVEL;
|
---|
526 | Assert(getpriority(PRIO_PROCESS, 0) == iPriority); NOREF(iPriority);
|
---|
527 | }
|
---|
528 |
|
---|
529 | /*
|
---|
530 | * Now let's see what we can do...
|
---|
531 | */
|
---|
532 | int iPriority = getpriority(PRIO_PROCESS, 0);
|
---|
533 | switch (g_enmOsPrioSup)
|
---|
534 | {
|
---|
535 | case OSPRIOSUP_PROCESS_AND_THREAD_LEVEL:
|
---|
536 | {
|
---|
537 | g_aDefaultPriority.iNice = iPriority;
|
---|
538 | g_aDefaultPriority.iDelta = 0;
|
---|
539 | g_aDefaultPriority.paTypes = g_aTypesThread;
|
---|
540 | Assert(enmType == g_aDefaultPriority.paTypes[enmType].enmType);
|
---|
541 | break;
|
---|
542 | }
|
---|
543 |
|
---|
544 | case OSPRIOSUP_THREAD_LEVEL:
|
---|
545 | {
|
---|
546 | if (g_fCanNice)
|
---|
547 | g_aDefaultPriority.paTypes = g_aTypesUnixFree;
|
---|
548 | else
|
---|
549 | g_aDefaultPriority.paTypes = g_aTypesUnixRestricted;
|
---|
550 | Assert(enmType == g_aDefaultPriority.paTypes[enmType].enmType);
|
---|
551 | g_aDefaultPriority.iNice = iPriority - g_aDefaultPriority.paTypes[enmType].iPriority;
|
---|
552 | g_aDefaultPriority.iDelta = g_aDefaultPriority.iNice;
|
---|
553 | break;
|
---|
554 | }
|
---|
555 |
|
---|
556 | default:
|
---|
557 | AssertFailed();
|
---|
558 | break;
|
---|
559 | }
|
---|
560 | rtSchedDumpPriority();
|
---|
561 | return VINF_SUCCESS;
|
---|
562 | }
|
---|
563 |
|
---|
564 |
|
---|
565 | /**
|
---|
566 | * The validator thread.
|
---|
567 | * We don't want to mess with the priority of the calling thread.
|
---|
568 | *
|
---|
569 | * @remark This is pretty presumptive stuff, but if it works on Linux and
|
---|
570 | * FreeBSD it does what I want.
|
---|
571 | */
|
---|
572 | static void *rtSchedNativeValidatorThread(void *pvUser)
|
---|
573 | {
|
---|
574 | const PROCPRIORITY *pCfg = (const PROCPRIORITY *)pvUser;
|
---|
575 | SAVEDPRIORITY SavedPriority;
|
---|
576 | rtSchedNativeSave(&SavedPriority);
|
---|
577 |
|
---|
578 | int rc = VINF_SUCCESS;
|
---|
579 | switch (g_enmOsPrioSup)
|
---|
580 | {
|
---|
581 | /*
|
---|
582 | * Try set the specified process priority and then try
|
---|
583 | * out all the thread priorities which are used.
|
---|
584 | */
|
---|
585 | case OSPRIOSUP_PROCESS_AND_THREAD_LEVEL:
|
---|
586 | {
|
---|
587 | if (!setpriority(PRIO_PROCESS, 0, pCfg->iNice))
|
---|
588 | {
|
---|
589 | int iMin = sched_get_priority_min(SavedPriority.iPolicy);
|
---|
590 | pthread_t Self = pthread_self();
|
---|
591 | for (int i = RTTHREADTYPE_INVALID + 1; i < RTTHREADTYPE_END; i++)
|
---|
592 | {
|
---|
593 | struct sched_param SchedParam = SavedPriority.PthreadSchedParam;
|
---|
594 | SchedParam.sched_priority = pCfg->paTypes[i].iPriority
|
---|
595 | + pCfg->iDelta + iMin;
|
---|
596 | rc = pthread_setschedparam(Self, SavedPriority.iPthreadPolicy, &SchedParam);
|
---|
597 | if (rc)
|
---|
598 | {
|
---|
599 | rc = RTErrConvertFromErrno(rc);
|
---|
600 | break;
|
---|
601 | }
|
---|
602 | }
|
---|
603 | }
|
---|
604 | else
|
---|
605 | rc = RTErrConvertFromErrno(errno);
|
---|
606 | break;
|
---|
607 | }
|
---|
608 |
|
---|
609 | /*
|
---|
610 | * Try out the priorities from the top and down.
|
---|
611 | */
|
---|
612 | case OSPRIOSUP_THREAD_LEVEL:
|
---|
613 | {
|
---|
614 | int i = RTTHREADTYPE_END;
|
---|
615 | while (--i > RTTHREADTYPE_INVALID)
|
---|
616 | {
|
---|
617 | int iPriority = pCfg->paTypes[i].iPriority + pCfg->iDelta;
|
---|
618 | if (setpriority(PRIO_PROCESS, 0, iPriority))
|
---|
619 | {
|
---|
620 | rc = RTErrConvertFromErrno(errno);
|
---|
621 | break;
|
---|
622 | }
|
---|
623 | }
|
---|
624 | break;
|
---|
625 | }
|
---|
626 |
|
---|
627 | default:
|
---|
628 | AssertFailed();
|
---|
629 | break;
|
---|
630 | }
|
---|
631 |
|
---|
632 | /* done */
|
---|
633 | rtSchedNativeRestore(&SavedPriority);
|
---|
634 | return (void *)rc;
|
---|
635 | }
|
---|
636 |
|
---|
637 |
|
---|
638 | /**
|
---|
639 | * Validates and sets the process priority.
|
---|
640 | * This will check that all rtThreadNativeSetPriority() will success for all the
|
---|
641 | * thread types when applied to the current thread.
|
---|
642 | *
|
---|
643 | * @returns iprt status code.
|
---|
644 | * @param enmPriority The priority to validate and set.
|
---|
645 | */
|
---|
646 | DECLHIDDEN(int) rtProcNativeSetPriority(RTPROCPRIORITY enmPriority)
|
---|
647 | {
|
---|
648 | Assert(enmPriority > RTPROCPRIORITY_INVALID && enmPriority < RTPROCPRIORITY_LAST);
|
---|
649 |
|
---|
650 | int rc = VINF_SUCCESS;
|
---|
651 | if (enmPriority == RTPROCPRIORITY_DEFAULT)
|
---|
652 | g_pProcessPriority = &g_aDefaultPriority;
|
---|
653 | else
|
---|
654 | {
|
---|
655 | /*
|
---|
656 | * Select the array to search.
|
---|
657 | */
|
---|
658 | const PROCPRIORITY *pa;
|
---|
659 | unsigned c;
|
---|
660 | switch (g_enmOsPrioSup)
|
---|
661 | {
|
---|
662 | case OSPRIOSUP_PROCESS_AND_THREAD_LEVEL:
|
---|
663 | pa = g_aProcessAndThread;
|
---|
664 | c = RT_ELEMENTS(g_aProcessAndThread);
|
---|
665 | break;
|
---|
666 | case OSPRIOSUP_THREAD_LEVEL:
|
---|
667 | pa = g_aUnixConfigs;
|
---|
668 | c = RT_ELEMENTS(g_aUnixConfigs);
|
---|
669 | break;
|
---|
670 | default:
|
---|
671 | pa = NULL;
|
---|
672 | c = 0;
|
---|
673 | break;
|
---|
674 | }
|
---|
675 |
|
---|
676 | /*
|
---|
677 | * Search the array.
|
---|
678 | */
|
---|
679 | rc = VERR_FILE_NOT_FOUND;
|
---|
680 | unsigned i;
|
---|
681 | for (i = 0; i < c; i++)
|
---|
682 | {
|
---|
683 | if (pa[i].enmPriority == enmPriority)
|
---|
684 | {
|
---|
685 | /*
|
---|
686 | * Validate it.
|
---|
687 | */
|
---|
688 | int iPriority = getpriority(PRIO_PROCESS, 0);
|
---|
689 | int rc3 = rtSchedCreateThread(rtSchedNativeValidatorThread, (void *)&pa[i]);
|
---|
690 | Assert(getpriority(PRIO_PROCESS, 0) == iPriority); NOREF(iPriority);
|
---|
691 | if (RT_SUCCESS(rc))
|
---|
692 | rc = rc3;
|
---|
693 | if (RT_SUCCESS(rc))
|
---|
694 | break;
|
---|
695 | }
|
---|
696 | }
|
---|
697 |
|
---|
698 | /*
|
---|
699 | * Did we get lucky?
|
---|
700 | * If so update process priority and globals.
|
---|
701 | */
|
---|
702 | if (RT_SUCCESS(rc))
|
---|
703 | {
|
---|
704 | switch (g_enmOsPrioSup)
|
---|
705 | {
|
---|
706 | case OSPRIOSUP_PROCESS_AND_THREAD_LEVEL:
|
---|
707 | if (setpriority(PRIO_PROCESS, 0, pa[i].iNice))
|
---|
708 | {
|
---|
709 | rc = RTErrConvertFromErrno(errno);
|
---|
710 | AssertMsgFailed(("setpriority(,,%d) -> errno=%d rc=%Rrc\n", pa[i].iNice, errno, rc));
|
---|
711 | }
|
---|
712 | break;
|
---|
713 |
|
---|
714 | default:
|
---|
715 | break;
|
---|
716 | }
|
---|
717 |
|
---|
718 | if (RT_SUCCESS(rc))
|
---|
719 | g_pProcessPriority = &pa[i];
|
---|
720 | }
|
---|
721 | }
|
---|
722 |
|
---|
723 | #ifdef THREAD_LOGGING
|
---|
724 | LogFlow(("rtProcNativeSetPriority: returns %Rrc enmPriority=%d\n", rc, enmPriority));
|
---|
725 | rtSchedDumpPriority();
|
---|
726 | #endif
|
---|
727 | return rc;
|
---|
728 | }
|
---|
729 |
|
---|
730 |
|
---|
731 | /**
|
---|
732 | * Sets the priority of the thread according to the thread type
|
---|
733 | * and current process priority.
|
---|
734 | *
|
---|
735 | * The RTTHREADINT::enmType member has not yet been updated and will be updated by
|
---|
736 | * the caller on a successful return.
|
---|
737 | *
|
---|
738 | * @returns iprt status code.
|
---|
739 | * @param Thread The thread in question.
|
---|
740 | * @param enmType The thread type.
|
---|
741 | */
|
---|
742 | DECLHIDDEN(int) rtThreadNativeSetPriority(PRTTHREADINT pThread, RTTHREADTYPE enmType)
|
---|
743 | {
|
---|
744 | Assert(enmType > RTTHREADTYPE_INVALID && enmType < RTTHREADTYPE_END);
|
---|
745 | Assert(enmType == g_pProcessPriority->paTypes[enmType].enmType);
|
---|
746 | Assert((pthread_t)pThread->Core.Key == pthread_self());
|
---|
747 |
|
---|
748 | int rc = VINF_SUCCESS;
|
---|
749 | switch (g_enmOsPrioSup)
|
---|
750 | {
|
---|
751 | case OSPRIOSUP_PROCESS_AND_THREAD_LEVEL:
|
---|
752 | {
|
---|
753 | struct sched_param SchedParam = {-9999999};
|
---|
754 | int iPolicy = -7777777;
|
---|
755 | pthread_t Self = pthread_self();
|
---|
756 | rc = pthread_getschedparam(Self, &iPolicy, &SchedParam);
|
---|
757 | if (!rc)
|
---|
758 | {
|
---|
759 | SchedParam.sched_priority = g_pProcessPriority->paTypes[enmType].iPriority
|
---|
760 | + g_pProcessPriority->iDelta
|
---|
761 | + sched_get_priority_min(iPolicy);
|
---|
762 | rc = pthread_setschedparam(Self, iPolicy, &SchedParam);
|
---|
763 | if (!rc)
|
---|
764 | {
|
---|
765 | #ifdef THREAD_LOGGING
|
---|
766 | Log(("rtThreadNativeSetPriority: Thread=%p enmType=%d iPolicy=%d sched_priority=%d pid=%d\n",
|
---|
767 | pThread->Core.Key, enmType, iPolicy, SchedParam.sched_priority, getpid()));
|
---|
768 | #endif
|
---|
769 | break;
|
---|
770 | }
|
---|
771 | }
|
---|
772 |
|
---|
773 | int rcNative = rc;
|
---|
774 | rc = RTErrConvertFromErrno(rc);
|
---|
775 | AssertMsgFailed(("pthread_[gs]etschedparam(%p, %d, {%d}) -> rcNative=%d rc=%Rrc\n",
|
---|
776 | (void *)Self, iPolicy, SchedParam.sched_priority, rcNative, rc)); NOREF(rcNative);
|
---|
777 | break;
|
---|
778 | }
|
---|
779 |
|
---|
780 | case OSPRIOSUP_THREAD_LEVEL:
|
---|
781 | {
|
---|
782 | int iPriority = g_pProcessPriority->paTypes[enmType].iPriority + g_pProcessPriority->iDelta;
|
---|
783 | if (!setpriority(PRIO_PROCESS, 0, iPriority))
|
---|
784 | {
|
---|
785 | AssertMsg(iPriority == getpriority(PRIO_PROCESS, 0), ("iPriority=%d getpriority()=%d\n", iPriority, getpriority(PRIO_PROCESS, 0)));
|
---|
786 | #ifdef THREAD_LOGGING
|
---|
787 | Log(("rtThreadNativeSetPriority: Thread=%p enmType=%d iPriority=%d pid=%d\n", pThread->Core.Key, enmType, iPriority, getpid()));
|
---|
788 | #endif
|
---|
789 | }
|
---|
790 | else
|
---|
791 | {
|
---|
792 | #if 0
|
---|
793 | rc = RTErrConvertFromErrno(errno);
|
---|
794 | AssertMsgFailed(("setpriority(,, %d) -> errno=%d rc=%Rrc\n", iPriority, errno, rc));
|
---|
795 | #else
|
---|
796 | /** @todo
|
---|
797 | * Just keep quiet about failures now - we'll fail here because we're not
|
---|
798 | * allowed to raise our own priority. This is a problem when starting the
|
---|
799 | * threads with higher priority from EMT (i.e. most threads it starts).
|
---|
800 | * This is apparently inherited from the parent in some cases and not
|
---|
801 | * in other cases. I guess this would come down to which kind of pthread
|
---|
802 | * implementation is actually in use, and how many sensible patches which
|
---|
803 | * are installed.
|
---|
804 | * I need to find a system where this problem shows up in order to come up
|
---|
805 | * with a proper fix. There's an pthread_create attribute for not inheriting
|
---|
806 | * scheduler stuff I think...
|
---|
807 | */
|
---|
808 | rc = VINF_SUCCESS;
|
---|
809 | #endif
|
---|
810 | }
|
---|
811 | break;
|
---|
812 | }
|
---|
813 |
|
---|
814 | /*
|
---|
815 | * Any thread created before we determine the default config, remains unchanged!
|
---|
816 | * The prober thread above is one of those.
|
---|
817 | */
|
---|
818 | default:
|
---|
819 | break;
|
---|
820 | }
|
---|
821 |
|
---|
822 | return rc;
|
---|
823 | }
|
---|
824 |
|
---|