1 | /* |
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2 | * pthread.c - User level <pthread> library implementation. |
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3 | * |
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4 | * Author Alain Greiner (2016,2017,2018,2019) |
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5 | * |
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6 | * Copyright (c) UPMC Sorbonne Universites |
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7 | * |
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8 | * This file is part of ALMOS-MKH. |
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9 | * |
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10 | * ALMOS-MKH is free software; you can redistribute it and/or modify it |
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11 | * under the terms of the GNU General Public License as published by |
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12 | * the Free Software Foundation; version 2.0 of the License. |
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13 | * |
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14 | * ALMOS-MKH is distributed in the hope that it will be useful, but |
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15 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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17 | * General Public License for more details. |
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18 | * |
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19 | * You should have received a copy of the GNU General Public License |
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20 | * along with ALMOS-MKH; if not, write to the Free Software Foundation, |
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21 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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22 | */ |
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23 | |
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24 | #include <hal_user.h> |
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25 | #include <hal_shared_types.h> |
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26 | #include <stdio.h> |
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27 | #include <stdlib.h> |
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28 | #include <pthread.h> |
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29 | #include <shared_pthread.h> |
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30 | #include <almosmkh.h> |
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31 | #include <syscalls_numbers.h> |
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32 | |
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33 | |
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34 | //////////////////////////////////////////////////////////////////////////////////////////// |
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35 | // Threads |
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36 | //////////////////////////////////////////////////////////////////////////////////////////// |
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37 | |
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38 | ///////////////////////////////////////////////// |
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39 | int pthread_create( pthread_t * trdid, |
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40 | const pthread_attr_t * attr, |
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41 | void * start_func, |
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42 | void * start_args ) |
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43 | { |
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44 | return hal_user_syscall( SYS_THREAD_CREATE, |
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45 | (reg_t)trdid, |
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46 | (reg_t)attr, |
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47 | (reg_t)start_func, |
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48 | (reg_t)start_args ); |
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49 | } |
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50 | |
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51 | ///////////////////////////////////// |
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52 | int pthread_join( pthread_t trdid, |
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53 | void ** exit_value ) |
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54 | { |
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55 | return hal_user_syscall( SYS_THREAD_JOIN, |
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56 | (reg_t)trdid, |
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57 | (reg_t)exit_value, 0, 0 ); |
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58 | } |
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59 | |
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60 | /////////////////////////////////////// |
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61 | int pthread_detach( pthread_t trdid ) |
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62 | { |
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63 | return hal_user_syscall( SYS_THREAD_DETACH, |
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64 | (reg_t)trdid, 0, 0, 0 ); |
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65 | } |
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66 | |
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67 | ///////////////////////////////////// |
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68 | int pthread_exit( void * exit_value ) |
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69 | { |
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70 | return hal_user_syscall( SYS_THREAD_EXIT, |
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71 | (reg_t)exit_value, 0, 0, 0 ); |
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72 | } |
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73 | |
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74 | ///////////////////////// |
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75 | int pthread_yield( void ) |
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76 | { |
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77 | return hal_user_syscall( SYS_THREAD_YIELD, 0, 0, 0, 0 ); |
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78 | } |
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79 | |
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80 | //////////////////////////////////////////////////////////////////////////////////////////// |
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81 | // Mutexes |
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82 | //////////////////////////////////////////////////////////////////////////////////////////// |
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83 | |
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84 | ////////////////////////////////////////////////////////// |
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85 | int pthread_mutex_init( pthread_mutex_t * mutex, |
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86 | const pthread_mutexattr_t * attr ) |
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87 | { |
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88 | if( attr != NULL ) |
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89 | { |
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90 | printf("\n[ERROR] in %s : <attr> argument not supported\n", __FUNCTION__); |
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91 | return -1; |
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92 | } |
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93 | |
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94 | return hal_user_syscall( SYS_MUTEX, |
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95 | (reg_t)mutex, |
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96 | MUTEX_INIT, |
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97 | 0, 0 ); |
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98 | } |
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99 | |
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100 | //////////////////////////////////////////////////// |
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101 | int pthread_mutex_destroy( pthread_mutex_t * mutex ) |
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102 | { |
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103 | return hal_user_syscall( SYS_MUTEX, |
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104 | (reg_t)mutex, |
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105 | MUTEX_DESTROY, |
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106 | 0, 0 ); |
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107 | } |
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108 | |
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109 | ///////////////////////////////////////////////// |
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110 | int pthread_mutex_lock( pthread_mutex_t * mutex ) |
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111 | { |
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112 | return hal_user_syscall( SYS_MUTEX, |
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113 | (reg_t)mutex, |
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114 | MUTEX_LOCK, |
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115 | 0, 0 ); |
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116 | } |
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117 | |
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118 | //////////////////////////////////////////////////// |
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119 | int pthread_mutex_trylock( pthread_mutex_t * mutex ) |
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120 | { |
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121 | return hal_user_syscall( SYS_MUTEX, |
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122 | (reg_t)mutex, |
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123 | MUTEX_TRYLOCK, |
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124 | 0, 0 ); |
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125 | } |
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126 | |
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127 | /////////////////////////////////////////////////// |
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128 | int pthread_mutex_unlock( pthread_mutex_t * mutex ) |
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129 | { |
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130 | return hal_user_syscall( SYS_MUTEX, |
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131 | (reg_t)mutex, |
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132 | MUTEX_UNLOCK, |
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133 | 0, 0 ); |
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134 | } |
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135 | |
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136 | //////////////////////////////////////////////////////////////////////////////////////////// |
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137 | // Condvars |
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138 | //////////////////////////////////////////////////////////////////////////////////////////// |
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139 | |
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140 | /////////////////////////////////////////////// |
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141 | int pthread_cond_init( pthread_cond_t * cond, |
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142 | pthread_condattr_t * attr ) |
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143 | { |
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144 | if( attr ) |
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145 | { |
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146 | printf("[ERROR] in %s ; <attr> argument must be NULL\n", __FUNCTION__ ); |
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147 | return -1; |
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148 | } |
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149 | |
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150 | return hal_user_syscall( SYS_CONDVAR, |
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151 | (reg_t)cond, |
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152 | CONDVAR_INIT, |
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153 | 0, 0 ); |
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154 | } |
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155 | |
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156 | ///////////////////////////////////////////////// |
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157 | int pthread_cond_destroy( pthread_cond_t * cond ) |
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158 | { |
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159 | return hal_user_syscall( SYS_CONDVAR, |
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160 | (reg_t)cond, |
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161 | CONDVAR_DESTROY, |
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162 | 0, 0 ); |
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163 | } |
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164 | |
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165 | ////////////////////////////////////////////// |
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166 | int pthread_cond_wait( pthread_cond_t * cond, |
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167 | pthread_mutex_t * mutex ) |
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168 | { |
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169 | return hal_user_syscall( SYS_CONDVAR, |
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170 | (reg_t)cond, |
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171 | CONDVAR_WAIT, |
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172 | (reg_t)mutex, |
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173 | 0 ); |
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174 | } |
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175 | |
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176 | //////////////////////////////////////////////// |
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177 | int pthread_cond_signal( pthread_cond_t * cond ) |
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178 | { |
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179 | return hal_user_syscall( SYS_CONDVAR, |
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180 | (reg_t)cond, |
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181 | CONDVAR_SIGNAL, |
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182 | 0, 0 ); |
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183 | } |
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184 | |
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185 | /////////////////////////////////////////////////// |
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186 | int pthread_cond_broadcast( pthread_cond_t * cond ) |
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187 | { |
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188 | return hal_user_syscall( SYS_CONDVAR, |
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189 | (reg_t)cond, |
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190 | CONDVAR_BROADCAST, |
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191 | 0, 0 ); |
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192 | } |
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193 | |
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194 | |
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195 | //////////////////////////////////////////////////////////////////////////////////////////// |
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196 | // Barriers |
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197 | //////////////////////////////////////////////////////////////////////////////////////////// |
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198 | |
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199 | //////////////////////////////////////////////////////////////// |
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200 | int pthread_barrier_init( pthread_barrier_t * barrier, |
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201 | const pthread_barrierattr_t * attr, |
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202 | unsigned int count ) |
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203 | { |
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204 | return hal_user_syscall( SYS_BARRIER, |
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205 | (reg_t)barrier, |
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206 | BARRIER_INIT, |
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207 | (reg_t)count, |
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208 | (reg_t)attr ); |
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209 | } |
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210 | |
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211 | ////////////////////////////////////////////////////////// |
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212 | int pthread_barrier_destroy( pthread_barrier_t * barrier ) |
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213 | { |
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214 | return hal_user_syscall( SYS_BARRIER, |
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215 | (reg_t)barrier, |
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216 | BARRIER_DESTROY, |
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217 | 0, 0 ); |
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218 | } |
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219 | |
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220 | /////////////////////////////////////////////////////// |
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221 | int pthread_barrier_wait( pthread_barrier_t * barrier ) |
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222 | { |
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223 | return hal_user_syscall( SYS_BARRIER, |
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224 | (reg_t)barrier, |
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225 | BARRIER_WAIT, |
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226 | 0, 0 ); |
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227 | } |
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228 | |
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229 | /* |
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230 | |
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231 | //////////////////////////////////////////////////////////////////////////////////////////// |
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232 | // The following functions define another implementation for the POSX barrier |
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233 | // based on a distributed quadtree implemented in user space, and relying |
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234 | // on a busy waiting policy. |
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235 | //////////////////////////////////////////////////////////////////////////////////////////// |
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236 | |
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237 | |
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238 | //////////////////////////////////////////////////////////////////////////////////////////// |
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239 | // This recursive function initializes the SQT nodes |
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240 | // traversing the SQT from root to bottom |
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241 | //////////////////////////////////////////////////////////////////////////////////////////// |
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242 | static void sqt_barrier_build( pthread_barrier_t * barrier, |
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243 | unsigned int x, |
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244 | unsigned int y, |
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245 | unsigned int level, |
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246 | sqt_node_t * parent, |
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247 | unsigned int x_size, |
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248 | unsigned int y_size, |
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249 | unsigned int nthreads ) |
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250 | { |
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251 | // get target node address |
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252 | sqt_node_t * node = barrier->node[x][y][level]; |
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253 | |
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254 | if (level == 0 ) // terminal case |
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255 | { |
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256 | // initializes target node |
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257 | node->arity = nthreads; |
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258 | node->count = nthreads; |
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259 | node->sense = 0; |
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260 | node->level = 0; |
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261 | node->parent = parent; |
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262 | node->child[0] = NULL; |
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263 | node->child[1] = NULL; |
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264 | node->child[2] = NULL; |
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265 | node->child[3] = NULL; |
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266 | |
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267 | #if PTHREAD_BARRIER_DEBUG |
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268 | printf("\n[BARRIER] %s : sqt_node[%d][%d][%d] / arity %d / desc %x\n" |
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269 | "parent %x / child0 %x / child1 %x / child2 %x / child3 %x\n", |
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270 | __FUNCTION__, x, y, level, node->arity, node, node->parent, |
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271 | node->child[0], node->child[1], node->child[2], node->child[3] ); |
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272 | #endif |
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273 | |
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274 | } |
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275 | else // non terminal case |
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276 | { |
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277 | unsigned int cx[4]; // x coordinate for children |
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278 | unsigned int cy[4]; // y coordinate for children |
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279 | unsigned int arity = 0; |
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280 | unsigned int i; |
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281 | |
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282 | // the child0 coordinates are equal to the parent coordinates |
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283 | // other children coordinates are incremented depending on the level value |
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284 | cx[0] = x; |
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285 | cy[0] = y; |
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286 | |
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287 | cx[1] = x; |
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288 | cy[1] = y + (1 << (level-1)); |
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289 | |
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290 | cx[2] = x + (1 << (level-1)); |
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291 | cy[2] = y; |
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292 | |
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293 | cx[3] = x + (1 << (level-1)); |
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294 | cy[3] = y + (1 << (level-1)); |
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295 | |
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296 | // initializes parent node taken into account the actual number of childs |
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297 | // child pointer is NULL if coordinates outside the mesh |
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298 | for ( i = 0 ; i < 4 ; i++ ) |
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299 | { |
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300 | if ( (cx[i] < x_size) && (cy[i] < y_size) ) |
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301 | { |
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302 | node->child[i] = barrier->node[cx[i]][cy[i]][level-1]; |
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303 | arity++; |
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304 | } |
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305 | else node->child[i] = NULL; |
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306 | } |
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307 | node->arity = arity; |
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308 | node->count = arity; |
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309 | node->sense = 0; |
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310 | node->level = level; |
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311 | node->parent = parent; |
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312 | |
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313 | #if PTHREAD_BARRIER_DEBUG |
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314 | printf("\n[BARRIER] %s : sqt_node[%d][%d][%d] / arity %d / desc %x\n" |
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315 | "parent %x / child0 %x / child1 %x / child2 %x / child3 %x\n", |
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316 | __FUNCTION__, x, y, level, node->arity, node, node->parent, |
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317 | node->child[0], node->child[1], node->child[2], node->child[3] ); |
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318 | #endif |
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319 | |
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320 | // recursive calls for children nodes |
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321 | for ( i = 0 ; i < 4 ; i++ ) |
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322 | { |
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323 | if ( (cx[i] < x_size) && (cy[i] < y_size) ) |
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324 | sqt_barrier_build( barrier, |
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325 | cx[i], |
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326 | cy[i], |
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327 | level-1, |
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328 | node, |
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329 | x_size, |
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330 | y_size, |
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331 | nthreads ); |
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332 | } |
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333 | } |
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334 | } // end sqt_barrier_build() |
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335 | |
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336 | //////////////////////////////////////////////////////////////// |
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337 | int pthread_barrier_init( pthread_barrier_t * barrier, |
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338 | const pthread_barrierattr_t * attr, |
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339 | unsigned int count ) |
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340 | { |
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341 | unsigned int x_size; |
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342 | unsigned int y_size; |
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343 | unsigned int nthreads; |
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344 | |
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345 | if( attr != NULL ) |
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346 | { |
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347 | x_size = attr->x_size; |
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348 | y_size = attr->y_size; |
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349 | nthreads = attr->nthreads; |
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350 | } |
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351 | else |
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352 | { |
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353 | x_size = 1; |
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354 | y_size = 1; |
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355 | nthreads = count; |
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356 | } |
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357 | |
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358 | // check attributes / count |
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359 | if( (x_size * y_size * nthreads) != count ) |
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360 | { |
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361 | printf("\[ERROR] in %s : count != x_size * y_size * nthreads/n", __FUNCTION__); |
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362 | exit( EXIT_FAILURE ); |
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363 | } |
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364 | |
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365 | // compute SQT levels |
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366 | unsigned int levels; |
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367 | unsigned int z = (x_size > y_size) ? x_size : y_size; |
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368 | levels = (z < 2) ? 1 : (z < 3) ? 2 : (z < 5) ? 3 : (z < 9) ? 4 : 5; |
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369 | |
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370 | #if PTHREAD_BARRIER_DEBUG |
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371 | unsigned int side = (z < 2) ? 1 : (z < 3) ? 2 : (z < 5) ? 4 : (z < 9) ? 8 : 16; |
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372 | printf("\n[BARRIER] %s : x_size = %d / y_size = %d / levels = %d / side = %d\n", |
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373 | __FUNCTION__ , x_size , y_size , levels , side ); |
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374 | #endif |
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375 | |
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376 | // allocates memory for the SQT nodes and initializes SQT nodes pointers array |
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377 | // the actual number of SQT nodes in a cluster(x,y) depends on (x,y): |
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378 | // At least 1 node / at most 5 nodes |
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379 | unsigned int x; // x coordinate for one SQT node |
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380 | unsigned int y; // y coordinate for one SQT node |
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381 | unsigned int l; // level for one SQT node |
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382 | for ( x = 0 ; x < x_size ; x++ ) |
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383 | { |
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384 | for ( y = 0 ; y < y_size ; y++ ) |
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385 | { |
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386 | unsigned int cxy = (x<<QDT_YWIDTH) + y; |
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387 | |
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388 | for ( l = 0 ; l < levels ; l++ ) |
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389 | { |
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390 | if ( ( (l == 0) && ((x&0x00) == 0) && ((y&0x00) == 0) ) || |
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391 | ( (l == 1) && ((x&0x01) == 0) && ((y&0x01) == 0) ) || |
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392 | ( (l == 2) && ((x&0x03) == 0) && ((y&0x03) == 0) ) || |
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393 | ( (l == 3) && ((x&0x07) == 0) && ((y&0x07) == 0) ) || |
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394 | ( (l == 4) && ((x&0x0F) == 0) && ((y&0x0F) == 0) ) ) |
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395 | { |
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396 | sqt_node_t * node = remote_malloc( sizeof(sqt_node_t) , cxy ); |
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397 | |
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398 | if( node == NULL ) |
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399 | { |
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400 | printf("\n[ERROR] in %s : cannot allocate sqt_node in cluster %x\n", |
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401 | __FUNCTION__ , cxy ); |
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402 | return -1; |
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403 | } |
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404 | |
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405 | barrier->node[x][y][l] = node; |
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406 | |
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407 | } |
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408 | } |
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409 | } |
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410 | } |
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411 | |
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412 | // recursively initialize all SQT nodes from root to bottom |
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413 | sqt_barrier_build( barrier, |
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414 | 0, |
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415 | 0, |
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416 | levels-1, |
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417 | NULL, |
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418 | x_size, |
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419 | y_size, |
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420 | nthreads ); |
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421 | |
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422 | hal_user_fence(); |
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423 | |
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424 | return 0; |
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425 | |
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426 | } // end pthread_barrier_init |
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427 | |
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428 | ////////////////////////////////////////////////////////////////////////////////////////// |
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429 | // This recursive function decrements the distributed "count" variables, |
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430 | // traversing the SQT from bottom to root. |
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431 | // The last arrived thread reset the local node before returning. |
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432 | ////////////////////////////////////////////////////////////////////////////////////////// |
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433 | static void sqt_barrier_decrement( sqt_node_t * node ) |
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434 | { |
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435 | |
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436 | #if PTHREAD_BARRIER_DEBUG |
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437 | unsigned int cxy; |
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438 | unsigned int lid; |
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439 | get_core( &cxy , &lid ); |
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440 | printf("\n[BARRIER] %s : core[%x,%d] decrement SQT barrier node %x :\n" |
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441 | " level = %d / parent = %x / arity = %d / sense = %d / count = %d\n", |
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442 | __FUNCTION__ , cxy , lid , (unsigned int)node , |
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443 | node->level , node->parent, node->arity , node->sense , node->count ); |
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444 | #endif |
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445 | |
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446 | unsigned int expected; |
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447 | |
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448 | // compute expected sense value |
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449 | if ( node->sense == 0) expected = 1; |
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450 | else expected = 0; |
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451 | |
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452 | // atomically decrement count |
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453 | int count = hal_user_atomic_add( (int *)&node->count , -1 ); |
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454 | |
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455 | // last arrived thread makes the recursive call |
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456 | if ( count == 1 ) // last thread |
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457 | { |
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458 | // decrement the parent node if the current node is not the root |
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459 | if ( node->parent != NULL ) sqt_barrier_decrement( node->parent ); |
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460 | |
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461 | #if PTHREAD_BARRIER_DEBUG |
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462 | printf("\n[BARRIER] %s : core[%x,%d] reset SQT barrier node %x :\n" |
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463 | " level = %d / arity = %d / sense = %d / count = %d\n", |
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464 | __FUNCTION__ , cxy , lid , (unsigned int)node , |
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465 | node->level , node->arity , node->sense , node->count ); |
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466 | #endif |
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467 | // reset the current node |
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468 | node->sense = expected; |
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469 | node->count = node->arity; |
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470 | |
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471 | return; |
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472 | } |
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473 | else // not the last thread |
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474 | { |
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475 | while( 1 ) |
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476 | { |
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477 | // poll sense |
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478 | if( node->sense == expected ) break; |
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479 | |
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480 | // deschedule |
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481 | pthread_yield(); |
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482 | } |
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483 | |
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484 | return; |
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485 | } |
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486 | } // end sqt_barrier_decrement() |
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487 | |
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488 | /////////////////////////////////////////////////////// |
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489 | int pthread_barrier_wait( pthread_barrier_t * barrier ) |
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490 | { |
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491 | // get calling core cluster |
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492 | unsigned int cxy; |
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493 | unsigned int lid; |
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494 | get_core( &cxy , &lid ); |
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495 | |
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496 | // get calling core coordinate |
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497 | unsigned int x = cxy >> QDT_YWIDTH; |
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498 | unsigned int y = cxy & QDT_YMASK; |
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499 | |
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500 | #if PTHREAD_BARRIER_DEBUG |
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501 | printf("\n[BARRIER] %s : core[%x,%d] enter / barrier = %x / node = %x\n", |
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502 | __FUNCTION__ , cxy , lid , barrier, barrier->node[x][y][0] ); |
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503 | #endif |
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504 | |
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505 | // recursively decrement count from bottom to root |
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506 | sqt_barrier_decrement( barrier->node[x][y][0] ); |
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507 | |
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508 | hal_user_fence(); |
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509 | |
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510 | return 0; |
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511 | |
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512 | } // end pthread_barrier_wait() |
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513 | |
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514 | */ |
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515 | |
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516 | |
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517 | |
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518 | // Local Variables: |
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519 | // tab-width: 4 |
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520 | // c-basic-offset: 4 |
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521 | // c-file-offsets:((innamespace . 0)(inline-open . 0)) |
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522 | // indent-tabs-mode: nil |
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523 | // End: |
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524 | // vim: filetype=c:expandtab:shiftwidth=4:tabstop=4:softtabstop=4 |
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525 | |
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