1 | /* |
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2 | * thread.c - implementation of thread operations (user & kernel) |
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3 | * |
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4 | * Author Ghassan Almaless (2008,2009,2010,2011,2012) |
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5 | * Alain Greiner (2016,2017) |
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6 | * |
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7 | * Copyright (c) UPMC Sorbonne Universites |
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8 | * |
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9 | * This file is part of ALMOS-MKH. |
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10 | * |
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11 | * ALMOS-MKH is free software; you can redistribute it and/or modify it |
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12 | * under the terms of the GNU General Public License as published by |
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13 | * the Free Software Foundation; version 2.0 of the License. |
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14 | * |
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15 | * ALMOS-MKH is distributed in the hope that it will be useful, but |
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16 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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18 | * General Public License for more details. |
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19 | * |
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20 | * You should have received a copy of the GNU General Public License |
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21 | * along with ALMOS-MKH; if not, write to the Free Software Foundation, |
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22 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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23 | */ |
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24 | |
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25 | #include <kernel_config.h> |
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26 | #include <hal_types.h> |
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27 | #include <hal_context.h> |
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28 | #include <hal_irqmask.h> |
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29 | #include <hal_special.h> |
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30 | #include <hal_remote.h> |
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31 | #include <memcpy.h> |
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32 | #include <printk.h> |
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33 | #include <cluster.h> |
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34 | #include <process.h> |
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35 | #include <scheduler.h> |
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36 | #include <dev_icu.h> |
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37 | #include <core.h> |
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38 | #include <list.h> |
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39 | #include <xlist.h> |
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40 | #include <page.h> |
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41 | #include <kmem.h> |
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42 | #include <ppm.h> |
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43 | #include <thread.h> |
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44 | |
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45 | ////////////////////////////////////////////////////////////////////////////////////// |
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46 | // Extern global variables |
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47 | ////////////////////////////////////////////////////////////////////////////////////// |
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48 | |
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49 | extern process_t process_zero; |
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50 | |
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51 | ////////////////////////////////////////////////////////////////////////////////////// |
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52 | // This function returns a printable string for the thread type. |
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53 | ////////////////////////////////////////////////////////////////////////////////////// |
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54 | char * thread_type_str( uint32_t type ) |
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55 | { |
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56 | if ( type == THREAD_USER ) return "USER"; |
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57 | else if( type == THREAD_RPC ) return "RPC"; |
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58 | else if( type == THREAD_DEV ) return "DEV"; |
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59 | else if( type == THREAD_KERNEL ) return "KERNEL"; |
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60 | else if( type == THREAD_IDLE ) return "IDLE"; |
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61 | else return "undefined"; |
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62 | } |
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63 | |
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64 | ///////////////////////////////////////////////////////////////////////////////////// |
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65 | // This static function allocates physical memory for a thread descriptor. |
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66 | // It can be called by the three functions: |
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67 | // - thread_user_create() |
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68 | // - thread_user_fork() |
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69 | // - thread_kernel_create() |
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70 | ///////////////////////////////////////////////////////////////////////////////////// |
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71 | // @ return pointer on thread descriptor if success / return NULL if failure. |
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72 | ///////////////////////////////////////////////////////////////////////////////////// |
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73 | static thread_t * thread_alloc() |
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74 | { |
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75 | page_t * page; // pointer on page descriptor containing thread descriptor |
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76 | kmem_req_t req; // kmem request |
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77 | |
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78 | // allocates memory for thread descriptor + kernel stack |
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79 | req.type = KMEM_PAGE; |
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80 | req.size = CONFIG_THREAD_DESC_ORDER; |
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81 | req.flags = AF_KERNEL | AF_ZERO; |
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82 | page = kmem_alloc( &req ); |
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83 | |
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84 | // return pointer on new thread descriptor |
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85 | if( page == NULL ) return NULL; |
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86 | else return (thread_t *)ppm_page2vaddr( page ); |
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87 | } |
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88 | |
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89 | ///////////////////////////////////////////////////////////////////////////////////// |
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90 | // This static function releases the physical memory for a thread descriptor. |
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91 | // It is called by the three functions: |
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92 | // - thread_user_create() |
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93 | // - thread_user_fork() |
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94 | // - thread_kernel_create() |
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95 | ///////////////////////////////////////////////////////////////////////////////////// |
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96 | // @ thread : pointer on thread descriptor. |
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97 | ///////////////////////////////////////////////////////////////////////////////////// |
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98 | static void thread_release( thread_t * thread ) |
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99 | { |
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100 | kmem_req_t req; |
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101 | |
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102 | req.type = KMEM_PAGE; |
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103 | req.ptr = ppm_vaddr2page( thread ); |
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104 | kmem_free( &req ); |
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105 | } |
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106 | |
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107 | ///////////////////////////////////////////////////////////////////////////////////// |
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108 | // This static function initializes a thread descriptor (kernel or user). |
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109 | // It can be called by the four functions: |
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110 | // - thread_user_create() |
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111 | // - thread_user_fork() |
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112 | // - thread_kernel_create() |
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113 | // - thread_user_init() |
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114 | ///////////////////////////////////////////////////////////////////////////////////// |
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115 | // @ thread : pointer on thread descriptor |
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116 | // @ process : pointer on process descriptor. |
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117 | // @ type : thread type. |
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118 | // @ func : pointer on thread entry function. |
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119 | // @ args : pointer on thread entry function arguments. |
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120 | // @ core_lid : target core local index. |
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121 | // @ u_stack_base : stack base (user thread only) |
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122 | // @ u_stack_size : stack base (user thread only) |
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123 | ///////////////////////////////////////////////////////////////////////////////////// |
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124 | static error_t thread_init( thread_t * thread, |
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125 | process_t * process, |
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126 | thread_type_t type, |
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127 | void * func, |
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128 | void * args, |
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129 | lid_t core_lid, |
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130 | intptr_t u_stack_base, |
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131 | uint32_t u_stack_size ) |
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132 | { |
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133 | error_t error; |
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134 | trdid_t trdid; // allocated thread identifier |
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135 | |
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136 | cluster_t * local_cluster = LOCAL_CLUSTER; |
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137 | |
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138 | // register new thread in process descriptor, and get a TRDID |
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139 | spinlock_lock( &process->th_lock ); |
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140 | error = process_register_thread( process, thread , &trdid ); |
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141 | spinlock_unlock( &process->th_lock ); |
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142 | |
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143 | if( error ) |
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144 | { |
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145 | printk("\n[ERROR] in %s : cannot get TRDID\n", __FUNCTION__ ); |
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146 | return EINVAL; |
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147 | } |
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148 | |
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149 | // Initialize new thread descriptor |
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150 | thread->trdid = trdid; |
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151 | thread->type = type; |
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152 | thread->quantum = 0; // TODO |
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153 | thread->ticks_nr = 0; // TODO |
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154 | thread->time_last_check = 0; |
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155 | thread->core = &local_cluster->core_tbl[core_lid]; |
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156 | thread->process = process; |
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157 | |
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158 | thread->local_locks = 0; |
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159 | list_root_init( &thread->locks_root ); |
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160 | |
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161 | thread->remote_locks = 0; |
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162 | xlist_root_init( XPTR( local_cxy , &thread->xlocks_root ) ); |
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163 | |
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164 | thread->u_stack_base = u_stack_base; |
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165 | thread->u_stack_size = u_stack_size; |
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166 | thread->k_stack_base = (intptr_t)thread; |
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167 | thread->k_stack_size = CONFIG_THREAD_DESC_SIZE; |
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168 | |
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169 | thread->entry_func = func; // thread entry point |
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170 | thread->entry_args = args; // thread function arguments |
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171 | thread->flags = 0; // all flags reset |
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172 | thread->signals = 0; // no pending signal |
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173 | thread->errno = 0; // no error detected |
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174 | thread->fork_user = 0; // no fork required |
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175 | thread->fork_cxy = 0; |
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176 | |
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177 | // thread blocked |
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178 | thread->blocked = THREAD_BLOCKED_GLOBAL; |
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179 | |
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180 | // reset children list |
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181 | xlist_root_init( XPTR( local_cxy , &thread->children_root ) ); |
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182 | thread->children_nr = 0; |
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183 | |
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184 | // reset sched list and brothers list |
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185 | list_entry_init( &thread->sched_list ); |
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186 | xlist_entry_init( XPTR( local_cxy , &thread->brothers_list ) ); |
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187 | |
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188 | // reset thread info |
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189 | memset( &thread->info , 0 , sizeof(thread_info_t) ); |
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190 | |
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191 | // initialise signature |
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192 | thread->signature = THREAD_SIGNATURE; |
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193 | |
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194 | // update local DQDT |
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195 | dqdt_local_update_threads( 1 ); |
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196 | |
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197 | // register new thread in core scheduler |
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198 | sched_register_thread( thread->core , thread ); |
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199 | |
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200 | return 0; |
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201 | |
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202 | } // end thread_init() |
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203 | |
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204 | |
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205 | ///////////////////////////////////////////////////////// |
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206 | error_t thread_user_create( pid_t pid, |
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207 | void * start_func, |
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208 | void * start_arg, |
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209 | pthread_attr_t * attr, |
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210 | thread_t ** new_thread ) |
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211 | { |
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212 | error_t error; |
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213 | thread_t * thread; // pointer on created thread descriptor |
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214 | process_t * process; // pointer to local process descriptor |
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215 | lid_t core_lid; // selected core local index |
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216 | vseg_t * vseg; // stack vseg |
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217 | |
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218 | thread_dmsg("\n[INFO] %s : enters for process %x\n", __FUNCTION__ , pid ); |
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219 | |
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220 | // get process descriptor local copy |
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221 | process = process_get_local_copy( pid ); |
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222 | |
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223 | if( process == NULL ) |
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224 | { |
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225 | printk("\n[ERROR] in %s : cannot get process descriptor %x\n", |
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226 | __FUNCTION__ , pid ); |
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227 | return ENOMEM; |
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228 | } |
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229 | |
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230 | // select a target core in local cluster |
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231 | if( attr->attributes & PT_ATTR_CORE_DEFINED ) core_lid = attr->lid; |
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232 | else core_lid = cluster_select_local_core(); |
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233 | |
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234 | // check core local index |
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235 | if( core_lid >= LOCAL_CLUSTER->cores_nr ) |
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236 | { |
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237 | printk("\n[ERROR] in %s : illegal core index attribute = %d\n", |
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238 | __FUNCTION__ , core_lid ); |
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239 | |
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240 | return EINVAL; |
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241 | } |
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242 | |
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243 | // allocate a stack from local VMM |
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244 | vseg = vmm_create_vseg( process, 0 , 0 , VSEG_TYPE_STACK ); |
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245 | |
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246 | if( vseg == NULL ); |
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247 | { |
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248 | printk("\n[ERROR] in %s : cannot create stack vseg\n", __FUNCTION__ ); |
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249 | return ENOMEM; |
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250 | } |
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251 | |
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252 | // allocates memory tor thread descriptor |
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253 | thread = thread_alloc(); |
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254 | |
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255 | if( thread == NULL ) |
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256 | { |
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257 | printk("\n[ERROR] in %s : cannot create new thread\n", __FUNCTION__ ); |
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258 | vmm_remove_vseg( vseg ); |
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259 | return ENOMEM; |
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260 | } |
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261 | |
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262 | // initializes thread descriptor |
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263 | error = thread_init( thread, |
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264 | process, |
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265 | THREAD_USER, |
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266 | start_func, |
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267 | start_arg, |
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268 | core_lid, |
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269 | vseg->min, |
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270 | vseg->max - vseg->min ); |
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271 | |
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272 | if( error ) |
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273 | { |
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274 | printk("\n[ERROR] in %s : cannot initialize new thread\n", __FUNCTION__ ); |
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275 | vmm_remove_vseg( vseg ); |
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276 | thread_release( thread ); |
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277 | return EINVAL; |
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278 | } |
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279 | |
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280 | // set LOADABLE flag |
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281 | thread->flags = THREAD_FLAG_LOADABLE; |
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282 | |
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283 | // set DETACHED flag if required |
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284 | if( attr->attributes & PT_ATTR_DETACH ) thread->flags |= THREAD_FLAG_DETACHED; |
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285 | |
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286 | // allocate & initialise CPU context |
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287 | error = hal_cpu_context_create( thread ); |
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288 | |
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289 | if( error ) |
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290 | { |
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291 | printk("\n[ERROR] in %s : cannot create CPU context\n", __FUNCTION__ ); |
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292 | vmm_remove_vseg( vseg ); |
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293 | thread_release( thread ); |
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294 | return ENOMEM; |
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295 | } |
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296 | |
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297 | // allocate & initialise FPU context |
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298 | error = hal_fpu_context_create( thread ); |
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299 | |
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300 | if( error ) |
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301 | { |
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302 | printk("\n[ERROR] in %s : cannot create FPU context\n", __FUNCTION__ ); |
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303 | vmm_remove_vseg( vseg ); |
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304 | thread_release( thread ); |
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305 | return ENOMEM; |
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306 | } |
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307 | |
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308 | thread_dmsg("\n[INFO] %s : exit / trdid = %x / process %x / core = %d\n", |
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309 | __FUNCTION__ , thread->trdid , process->pid , core_lid ); |
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310 | |
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311 | *new_thread = thread; |
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312 | return 0; |
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313 | |
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314 | } // end thread_user_create() |
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315 | |
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316 | |
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317 | ////////////////////////////////////////////// |
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318 | error_t thread_user_fork( process_t * process, |
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319 | thread_t ** new_thread ) |
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320 | { |
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321 | error_t error; |
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322 | thread_t * thread; // pointer on new thread descriptor |
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323 | lid_t core_lid; // selected core local index |
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324 | vseg_t * vseg; // stack vseg |
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325 | |
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326 | thread_dmsg("\n[INFO] %s : enters\n", __FUNCTION__ ); |
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327 | |
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328 | // allocate a stack from local VMM |
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329 | vseg = vmm_create_vseg( process, 0 , 0 , VSEG_TYPE_STACK ); |
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330 | |
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331 | if( vseg == NULL ); |
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332 | { |
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333 | printk("\n[ERROR] in %s : cannot create stack vseg\n", __FUNCTION__ ); |
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334 | return ENOMEM; |
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335 | } |
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336 | |
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337 | // select a target core in local cluster |
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338 | core_lid = cluster_select_local_core(); |
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339 | |
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340 | // get pointer on calling thread descriptor |
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341 | thread_t * this = CURRENT_THREAD; |
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342 | |
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343 | // allocated memory for new thread descriptor |
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344 | thread = thread_alloc(); |
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345 | |
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346 | if( thread == NULL ) |
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347 | { |
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348 | printk("\n[ERROR] in %s : cannot allocate new thread\n", __FUNCTION__ ); |
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349 | vmm_remove_vseg( vseg ); |
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350 | return ENOMEM; |
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351 | } |
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352 | |
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353 | // initializes thread descriptor |
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354 | error = thread_init( thread, |
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355 | process, |
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356 | THREAD_USER, |
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357 | this->entry_func, |
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358 | this->entry_args, |
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359 | core_lid, |
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360 | vseg->min, |
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361 | vseg->max - vseg->min ); |
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362 | |
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363 | if( error ) |
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364 | { |
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365 | printk("\n[ERROR] in %s : cannot initialize new thread\n", __FUNCTION__ ); |
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366 | vmm_remove_vseg( vseg ); |
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367 | thread_release( thread ); |
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368 | return EINVAL; |
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369 | } |
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370 | |
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371 | // set ATTACHED flag if set in this thread |
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372 | if( this->flags & THREAD_FLAG_DETACHED ) thread->flags = THREAD_FLAG_DETACHED; |
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373 | |
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374 | // allocate & initialise CPU context from calling thread |
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375 | error = hal_cpu_context_copy( thread , this ); |
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376 | |
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377 | if( error ) |
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378 | { |
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379 | printk("\n[ERROR] in %s : cannot create CPU context\n", __FUNCTION__ ); |
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380 | vmm_remove_vseg( vseg ); |
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381 | thread_release( thread ); |
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382 | return ENOMEM; |
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383 | } |
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384 | |
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385 | // allocate & initialise FPU context from calling thread |
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386 | error = hal_fpu_context_copy( thread , this ); |
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387 | |
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388 | if( error ) |
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389 | { |
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390 | printk("\n[ERROR] in %s : cannot create CPU context\n", __FUNCTION__ ); |
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391 | vmm_remove_vseg( vseg ); |
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392 | thread_release( thread ); |
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393 | return ENOMEM; |
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394 | } |
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395 | |
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396 | thread_dmsg("\n[INFO] %s : exit / thread %x for process %x on core %d in cluster %x\n", |
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397 | __FUNCTION__, thread->trdid, process->pid, core_lid, local_cxy ); |
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398 | |
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399 | *new_thread = thread; |
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400 | return 0; |
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401 | |
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402 | } // end thread_user_fork() |
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403 | |
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404 | |
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405 | |
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406 | ///////////////////////////////////////////////////////// |
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407 | error_t thread_kernel_create( thread_t ** new_thread, |
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408 | thread_type_t type, |
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409 | void * func, |
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410 | void * args, |
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411 | lid_t core_lid ) |
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412 | { |
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413 | error_t error; |
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414 | thread_t * thread; // pointer on new thread descriptor |
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415 | kmem_req_t req; // kmem request (for release) |
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416 | |
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417 | thread_dmsg("\n[INFO] %s : enters for type %s in cluster %x\n", |
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418 | __FUNCTION__ , thread_type_str( type ) , local_cxy ); |
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419 | |
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420 | assert( ( (type == THREAD_KERNEL) || (type == THREAD_RPC) || |
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421 | (type == THREAD_IDLE) || (type == THREAD_DEV) ) , |
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422 | __FUNCTION__ , "illegal thread type" ); |
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423 | |
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424 | assert( (core_lid < LOCAL_CLUSTER->cores_nr) , |
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425 | __FUNCTION__ , "illegal core_lid" ); |
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426 | |
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427 | // allocated memory for new thread descriptor |
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428 | thread = thread_alloc(); |
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429 | |
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430 | if( thread == NULL ) return ENOMEM; |
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431 | |
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432 | // initializes thread descriptor |
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433 | error = thread_init( thread, |
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434 | &process_zero, |
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435 | type, |
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436 | func, |
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437 | args, |
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438 | core_lid, |
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439 | 0 , 0 ); // no user stack for a kernel thread |
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440 | |
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441 | if( error ) // release allocated memory for thread descriptor |
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442 | { |
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443 | req.type = KMEM_PAGE; |
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444 | req.ptr = ppm_vaddr2page( thread ); |
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445 | kmem_free( &req ); |
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446 | return EINVAL; |
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447 | } |
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448 | |
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449 | |
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450 | // allocate & initialise CPU context |
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451 | hal_cpu_context_create( thread ); |
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452 | |
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453 | thread_dmsg("\n[INFO] %s : exit in cluster %x / trdid = %x / core_lid = %d\n", |
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454 | __FUNCTION__ , local_cxy , thread->trdid , core_lid ); |
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455 | |
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456 | *new_thread = thread; |
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457 | return 0; |
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458 | |
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459 | } // end thread_kernel_create() |
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460 | |
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461 | /////////////////////////////////////////////////// |
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462 | error_t thread_kernel_init( thread_t * thread, |
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463 | thread_type_t type, |
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464 | void * func, |
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465 | void * args, |
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466 | lid_t core_lid ) |
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467 | { |
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468 | assert( ( (type == THREAD_KERNEL) || (type == THREAD_RPC) || |
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469 | (type == THREAD_IDLE) || (type == THREAD_DEV) ) , |
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470 | __FUNCTION__ , "illegal thread type" ); |
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471 | |
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472 | if( core_lid >= LOCAL_CLUSTER->cores_nr ) |
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473 | { |
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474 | printk("\n[PANIC] in %s : illegal core_lid / cores = %d / lid = %d / cxy = %x\n", |
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475 | __FUNCTION__ , LOCAL_CLUSTER->cores_nr , core_lid , local_cxy ); |
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476 | hal_core_sleep(); |
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477 | } |
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478 | |
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479 | error_t error = thread_init( thread, |
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480 | &process_zero, |
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481 | type, |
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482 | func, |
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483 | args, |
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484 | core_lid, |
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485 | 0 , 0 ); // no user stack for a kernel thread |
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486 | |
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487 | // allocate & initialize CPU context if success |
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488 | if( error == 0 ) hal_cpu_context_create( thread ); |
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489 | |
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490 | return error; |
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491 | |
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492 | } // end thread_kernel_init() |
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493 | |
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494 | /////////////////////////////////////////////////////////////////////////////////////// |
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495 | // TODO: check that all memory dynamically allocated during thread execution |
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496 | // has been released, using a cache of mmap and malloc requests. [AG] |
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497 | /////////////////////////////////////////////////////////////////////////////////////// |
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498 | void thread_destroy( thread_t * thread ) |
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499 | { |
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500 | uint32_t tm_start; |
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501 | uint32_t tm_end; |
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502 | reg_t state; |
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503 | |
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504 | process_t * process = thread->process; |
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505 | core_t * core = thread->core; |
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506 | |
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507 | thread_dmsg("\n[INFO] %s : enters for thread %x in process %x / type = %s\n", |
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508 | __FUNCTION__ , thread->trdid , process->pid , thread_type_str( thread->type ) ); |
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509 | |
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510 | assert( (thread->children_nr == 0) , __FUNCTION__ , "still attached children" ); |
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511 | |
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512 | assert( (thread->local_locks == 0) , __FUNCTION__ , "all local locks not released" ); |
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513 | |
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514 | assert( (thread->remote_locks == 0) , __FUNCTION__ , "all remote locks not released" ); |
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515 | |
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516 | tm_start = hal_time_stamp(); |
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517 | |
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518 | // update intrumentation values |
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519 | uint32_t pgfaults = thread->info.pgfault_nr; |
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520 | uint32_t u_errors = thread->info.u_err_nr; |
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521 | uint32_t m_errors = thread->info.m_err_nr; |
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522 | |
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523 | process->vmm.pgfault_nr += pgfaults; |
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524 | process->vmm.u_err_nr += u_errors; |
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525 | process->vmm.m_err_nr += m_errors; |
---|
526 | |
---|
527 | // release memory allocated for CPU context and FPU context |
---|
528 | hal_cpu_context_destroy( thread ); |
---|
529 | hal_fpu_context_destroy( thread ); |
---|
530 | |
---|
531 | // release FPU if required |
---|
532 | // TODO This should be done before calling thread_destroy() |
---|
533 | hal_disable_irq( &state ); |
---|
534 | if( core->fpu_owner == thread ) |
---|
535 | { |
---|
536 | core->fpu_owner = NULL; |
---|
537 | hal_fpu_disable(); |
---|
538 | } |
---|
539 | hal_restore_irq( state ); |
---|
540 | |
---|
541 | // remove thread from process th_tbl[] |
---|
542 | // TODO This should be done before calling thread_destroy() |
---|
543 | ltid_t ltid = LTID_FROM_TRDID( thread->trdid ); |
---|
544 | |
---|
545 | spinlock_lock( &process->th_lock ); |
---|
546 | process->th_tbl[ltid] = XPTR_NULL; |
---|
547 | process->th_nr--; |
---|
548 | spinlock_unlock( &process->th_lock ); |
---|
549 | |
---|
550 | // update local DQDT |
---|
551 | dqdt_local_update_threads( -1 ); |
---|
552 | |
---|
553 | // invalidate thread descriptor |
---|
554 | thread->signature = 0; |
---|
555 | |
---|
556 | // release memory for thread descriptor |
---|
557 | thread_release( thread ); |
---|
558 | |
---|
559 | tm_end = hal_time_stamp(); |
---|
560 | |
---|
561 | thread_dmsg("\n[INFO] %s : exit for thread %x in process %x / duration = %d\n", |
---|
562 | __FUNCTION__, thread->trdid , process->pid , tm_end - tm_start ); |
---|
563 | |
---|
564 | } // end thread_destroy() |
---|
565 | |
---|
566 | |
---|
567 | ///////////////////////////////////////////////// |
---|
568 | void thread_child_parent_link( xptr_t xp_parent, |
---|
569 | xptr_t xp_child ) |
---|
570 | { |
---|
571 | // get extended pointers on children list root |
---|
572 | cxy_t parent_cxy = GET_CXY( xp_parent ); |
---|
573 | thread_t * parent_ptr = (thread_t *)GET_PTR( xp_parent ); |
---|
574 | xptr_t root = XPTR( parent_cxy , &parent_ptr->children_root ); |
---|
575 | |
---|
576 | // get extended pointer on children list entry |
---|
577 | cxy_t child_cxy = GET_CXY( xp_child ); |
---|
578 | thread_t * child_ptr = (thread_t *)GET_PTR( xp_child ); |
---|
579 | xptr_t entry = XPTR( child_cxy , &child_ptr->brothers_list ); |
---|
580 | |
---|
581 | // set the link |
---|
582 | xlist_add_first( root , entry ); |
---|
583 | hal_remote_atomic_add( XPTR( parent_cxy , &parent_ptr->children_nr ) , 1 ); |
---|
584 | } |
---|
585 | |
---|
586 | /////////////////////////////////////////////////// |
---|
587 | void thread_child_parent_unlink( xptr_t xp_parent, |
---|
588 | xptr_t xp_child ) |
---|
589 | { |
---|
590 | // get extended pointer on children list lock |
---|
591 | cxy_t parent_cxy = GET_CXY( xp_parent ); |
---|
592 | thread_t * parent_ptr = (thread_t *)GET_PTR( xp_parent ); |
---|
593 | xptr_t lock = XPTR( parent_cxy , &parent_ptr->children_lock ); |
---|
594 | |
---|
595 | // get extended pointer on children list entry |
---|
596 | cxy_t child_cxy = GET_CXY( xp_child ); |
---|
597 | thread_t * child_ptr = (thread_t *)GET_PTR( xp_child ); |
---|
598 | xptr_t entry = XPTR( child_cxy , &child_ptr->brothers_list ); |
---|
599 | |
---|
600 | // get the lock |
---|
601 | remote_spinlock_lock( lock ); |
---|
602 | |
---|
603 | // remove the link |
---|
604 | xlist_unlink( entry ); |
---|
605 | hal_remote_atomic_add( XPTR( parent_cxy , &parent_ptr->children_nr ) , -1 ); |
---|
606 | |
---|
607 | // release the lock |
---|
608 | remote_spinlock_unlock( lock ); |
---|
609 | } |
---|
610 | |
---|
611 | ///////////////////////////////////////////////// |
---|
612 | inline void thread_set_signal( thread_t * thread, |
---|
613 | uint32_t mask ) |
---|
614 | { |
---|
615 | hal_atomic_or( &thread->signals , mask ); |
---|
616 | } |
---|
617 | |
---|
618 | /////////////////////////////////////////////////// |
---|
619 | inline void thread_reset_signal( thread_t * thread, |
---|
620 | uint32_t mask ) |
---|
621 | { |
---|
622 | hal_atomic_and( &thread->signals , ~mask ); |
---|
623 | } |
---|
624 | |
---|
625 | ////////////////////////////////// |
---|
626 | inline bool_t thread_is_joinable() |
---|
627 | { |
---|
628 | thread_t * this = CURRENT_THREAD; |
---|
629 | return( (this->brothers_list.next != XPTR_NULL) && |
---|
630 | (this->brothers_list.pred != XPTR_NULL) ); |
---|
631 | } |
---|
632 | |
---|
633 | ////////////////////////////////// |
---|
634 | inline bool_t thread_is_runnable() |
---|
635 | { |
---|
636 | thread_t * this = CURRENT_THREAD; |
---|
637 | return( this->blocked == 0 ); |
---|
638 | } |
---|
639 | |
---|
640 | //////////////////////////////// |
---|
641 | inline bool_t thread_can_yield() |
---|
642 | { |
---|
643 | thread_t * this = CURRENT_THREAD; |
---|
644 | return ( (this->local_locks == 0) && (this->remote_locks == 0) ); |
---|
645 | } |
---|
646 | |
---|
647 | /////////////////////////// |
---|
648 | bool_t thread_check_sched() |
---|
649 | { |
---|
650 | thread_t * this = CURRENT_THREAD; |
---|
651 | |
---|
652 | // check locks count |
---|
653 | if( (this->local_locks != 0) || (this->remote_locks != 0) ) return false; |
---|
654 | |
---|
655 | // compute elapsed time, taking into account 32 bits register wrap |
---|
656 | uint32_t elapsed; |
---|
657 | uint32_t time_now = hal_time_stamp(); |
---|
658 | uint32_t time_last = this->time_last_check; |
---|
659 | if( time_now < time_last ) elapsed = (0xFFFFFFFF - time_last) + time_now; |
---|
660 | else elapsed = time_now - time_last; |
---|
661 | |
---|
662 | // update thread time |
---|
663 | this->time_last_check = time_now; |
---|
664 | |
---|
665 | // check elapsed time |
---|
666 | if( elapsed < CONFIG_CORE_CHECK_EVERY ) return false; |
---|
667 | else return true; |
---|
668 | } |
---|
669 | |
---|
670 | ///////////////////// |
---|
671 | error_t thread_exit() |
---|
672 | { |
---|
673 | reg_t sr_save; |
---|
674 | |
---|
675 | thread_t * this = CURRENT_THREAD; |
---|
676 | |
---|
677 | // test if this thread can be descheduled |
---|
678 | if( !thread_can_yield() ) |
---|
679 | { |
---|
680 | printk("ERROR in %s : thread %x in process %x on core %d in cluster %x\n" |
---|
681 | " did not released all locks\n", |
---|
682 | __FUNCTION__ , this->trdid , this->process->pid , |
---|
683 | CURRENT_CORE->lid , local_cxy ); |
---|
684 | return EINVAL; |
---|
685 | } |
---|
686 | |
---|
687 | if( this->flags & THREAD_FLAG_DETACHED ) |
---|
688 | { |
---|
689 | // if detached set signal and set blocking cause atomically |
---|
690 | hal_disable_irq( &sr_save ); |
---|
691 | thread_set_signal( this , THREAD_SIG_KILL ); |
---|
692 | thread_block( this , THREAD_BLOCKED_EXIT ); |
---|
693 | hal_restore_irq( sr_save ); |
---|
694 | } |
---|
695 | else |
---|
696 | { |
---|
697 | // if attached, set blocking cause |
---|
698 | thread_block( this , THREAD_BLOCKED_EXIT ); |
---|
699 | } |
---|
700 | |
---|
701 | // deschedule |
---|
702 | sched_yield(); |
---|
703 | return 0; |
---|
704 | |
---|
705 | } // end thread_exit() |
---|
706 | |
---|
707 | ///////////////////////////////////// |
---|
708 | void thread_block( thread_t * thread, |
---|
709 | uint32_t cause ) |
---|
710 | { |
---|
711 | // set blocking cause |
---|
712 | hal_atomic_or( &thread->blocked , cause ); |
---|
713 | |
---|
714 | } // end thread_block() |
---|
715 | |
---|
716 | //////////////////////////////////// |
---|
717 | void thread_unblock( xptr_t thread, |
---|
718 | uint32_t cause ) |
---|
719 | { |
---|
720 | // get thread cluster and local pointer |
---|
721 | cxy_t cxy = GET_CXY( thread ); |
---|
722 | thread_t * ptr = (thread_t *)GET_PTR( thread ); |
---|
723 | |
---|
724 | // reset blocking cause |
---|
725 | hal_remote_atomic_and( XPTR( cxy , &ptr->blocked ) , ~cause ); |
---|
726 | |
---|
727 | } // end thread_unblock() |
---|
728 | |
---|
729 | ///////////////////////////////////// |
---|
730 | void thread_kill( thread_t * target ) |
---|
731 | { |
---|
732 | // set SIG_KILL signal in target thread descriptor |
---|
733 | thread_set_signal( target , THREAD_SIG_KILL ); |
---|
734 | |
---|
735 | // set the global blocked bit in target thread descriptor. |
---|
736 | thread_block( target , THREAD_BLOCKED_GLOBAL ); |
---|
737 | |
---|
738 | // send an IPI to reschedule the target thread core. |
---|
739 | dev_icu_send_ipi( local_cxy , target->core->lid ); |
---|
740 | |
---|
741 | } // end thread_kill() |
---|
742 | |
---|
743 | |
---|
744 | /////////////////////// |
---|
745 | void thread_idle_func() |
---|
746 | { |
---|
747 | lid_t lid = CURRENT_CORE->lid; |
---|
748 | |
---|
749 | while( 1 ) |
---|
750 | { |
---|
751 | idle_dmsg("\n[INFO] %s : core[%x][%d] goes to sleep at cycle %d\n", |
---|
752 | __FUNCTION__ , local_cxy , lid , hal_time_stamp() ); |
---|
753 | |
---|
754 | // force core to sleeping state |
---|
755 | hal_core_sleep(); |
---|
756 | |
---|
757 | idle_dmsg("\n[INFO] %s : core[%x][%d] wake up at cycle %d\n", |
---|
758 | __FUNCTION__ , local_cxy , lid , hal_time_stamp() ); |
---|
759 | |
---|
760 | // acknowledge IRQ |
---|
761 | dev_icu_irq_handler(); |
---|
762 | |
---|
763 | // force scheduling |
---|
764 | sched_yield(); |
---|
765 | } |
---|
766 | } // end thread_idle() |
---|
767 | |
---|
768 | ///////////////////////////////////////////////// |
---|
769 | void thread_user_time_update( thread_t * thread ) |
---|
770 | { |
---|
771 | // TODO |
---|
772 | printk("\n[WARNING] function %s not implemented\n", __FUNCTION__ ); |
---|
773 | } |
---|
774 | |
---|
775 | /////////////////////////////////////////////////// |
---|
776 | void thread_kernel_time_update( thread_t * thread ) |
---|
777 | { |
---|
778 | // TODO |
---|
779 | printk("\n[WARNING] function %s not implemented\n", __FUNCTION__ ); |
---|
780 | } |
---|
781 | |
---|
782 | //////////////////////////////////////////////// |
---|
783 | void thread_signals_handle( thread_t * thread ) |
---|
784 | { |
---|
785 | // TODO |
---|
786 | printk("\n[WARNING] function %s not implemented\n", __FUNCTION__ ); |
---|
787 | } |
---|
788 | |
---|
789 | ///////////////////////////////////// |
---|
790 | xptr_t thread_get_xptr( pid_t pid, |
---|
791 | trdid_t trdid ) |
---|
792 | { |
---|
793 | cxy_t target_cxy; // target thread cluster identifier |
---|
794 | ltid_t target_thread_ltid; // target thread local index |
---|
795 | thread_t * target_thread_ptr; // target thread local pointer |
---|
796 | xptr_t target_process_xp; // extended pointer on target process descriptor |
---|
797 | process_t * target_process_ptr; // local pointer on target process descriptor |
---|
798 | pid_t target_process_pid; // target process identifier |
---|
799 | xlist_entry_t root; // root of list of process in target cluster |
---|
800 | xptr_t lock_xp; // extended pointer on lock protecting this list |
---|
801 | |
---|
802 | // get target cluster identifier and local thread identifier |
---|
803 | target_cxy = CXY_FROM_TRDID( trdid ); |
---|
804 | target_thread_ltid = LTID_FROM_TRDID( trdid ); |
---|
805 | |
---|
806 | // get root of list of process descriptors in target cluster |
---|
807 | hal_remote_memcpy( XPTR( local_cxy , &root ), |
---|
808 | XPTR( target_cxy , &LOCAL_CLUSTER->pmgr.local_root ), |
---|
809 | sizeof(xlist_entry_t) ); |
---|
810 | |
---|
811 | // get extended pointer on lock protecting the list of processes |
---|
812 | lock_xp = XPTR( target_cxy , &LOCAL_CLUSTER->pmgr.local_lock ); |
---|
813 | |
---|
814 | // take the lock protecting the list of processes in target cluster |
---|
815 | remote_spinlock_lock( lock_xp ); |
---|
816 | |
---|
817 | // loop on list of process in target cluster to find the PID process |
---|
818 | xptr_t iter; |
---|
819 | bool_t found = false; |
---|
820 | XLIST_FOREACH( XPTR( target_cxy , &LOCAL_CLUSTER->pmgr.local_root ) , iter ) |
---|
821 | { |
---|
822 | target_process_xp = XLIST_ELEMENT( iter , process_t , local_list ); |
---|
823 | target_process_ptr = (process_t *)GET_PTR( target_process_xp ); |
---|
824 | target_process_pid = hal_remote_lw( XPTR( target_cxy , &target_process_ptr->pid ) ); |
---|
825 | if( target_process_pid == pid ) |
---|
826 | { |
---|
827 | found = true; |
---|
828 | break; |
---|
829 | } |
---|
830 | } |
---|
831 | |
---|
832 | // release the lock protecting the list of processes in target cluster |
---|
833 | remote_spinlock_unlock( lock_xp ); |
---|
834 | |
---|
835 | // check target thread found |
---|
836 | if( found == false ) |
---|
837 | { |
---|
838 | return XPTR_NULL; |
---|
839 | } |
---|
840 | |
---|
841 | // get target thread local pointer |
---|
842 | xptr_t xp = XPTR( target_cxy , &target_process_ptr->th_tbl[target_thread_ltid] ); |
---|
843 | target_thread_ptr = (thread_t *)hal_remote_lpt( xp ); |
---|
844 | |
---|
845 | if( target_thread_ptr == NULL ) |
---|
846 | { |
---|
847 | return XPTR_NULL; |
---|
848 | } |
---|
849 | |
---|
850 | return XPTR( target_cxy , target_thread_ptr ); |
---|
851 | |
---|
852 | } // end thread_get_xptr() |
---|
853 | |
---|