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2 | pj | 1 | /* |
2 | * Project: S.Ha.R.K. |
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3 | * |
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4 | * Coordinators: |
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5 | * Giorgio Buttazzo <giorgio@sssup.it> |
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6 | * Paolo Gai <pj@gandalf.sssup.it> |
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7 | * |
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8 | * Authors : |
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9 | * Paolo Gai <pj@gandalf.sssup.it> |
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10 | * Massimiliano Giorgi <massy@gandalf.sssup.it> |
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11 | * Luca Abeni <luca@gandalf.sssup.it> |
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12 | * (see the web pages for full authors list) |
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13 | * |
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14 | * ReTiS Lab (Scuola Superiore S.Anna - Pisa - Italy) |
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15 | * |
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16 | * http://www.sssup.it |
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17 | * http://retis.sssup.it |
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18 | * http://shark.sssup.it |
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19 | */ |
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20 | |||
21 | |||
22 | /** |
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23 | ------------ |
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29 | pj | 24 | CVS : $Id: func.h,v 1.2 2002-11-11 08:36:01 pj Exp $ |
2 | pj | 25 | |
26 | File: $File$ |
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29 | pj | 27 | Revision: $Revision: 1.2 $ |
28 | Last update: $Date: 2002-11-11 08:36:01 $ |
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2 | pj | 29 | ------------ |
30 | |||
31 | Kernel functions: |
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32 | |||
33 | - Debug stuff |
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34 | |||
35 | - Primitives called at initialization time |
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36 | |||
37 | - Kernel global functions (scheduler, queues) |
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38 | |||
39 | - Kernel VM hooks |
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40 | |||
41 | - IRQ, errors & exception handling |
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42 | |||
43 | - System management primitives |
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44 | |||
45 | - Jet management primitives |
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46 | |||
47 | - Task management primitives |
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48 | |||
49 | - Mutex primitives |
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50 | |||
51 | **/ |
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52 | |||
53 | /* |
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54 | * Copyright (C) 2000 Paolo Gai |
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55 | * |
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56 | * This program is free software; you can redistribute it and/or modify |
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57 | * it under the terms of the GNU General Public License as published by |
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58 | * the Free Software Foundation; either version 2 of the License, or |
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59 | * (at your option) any later version. |
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60 | * |
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61 | * This program is distributed in the hope that it will be useful, |
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62 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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63 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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64 | * GNU General Public License for more details. |
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65 | * |
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66 | * You should have received a copy of the GNU General Public License |
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67 | * along with this program; if not, write to the Free Software |
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68 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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69 | * |
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70 | */ |
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71 | |||
72 | #ifndef __KERNEL_FUNC_H__ |
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73 | #define __KERNEL_FUNC_H__ |
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74 | |||
75 | #include <ll/ll.h> |
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76 | #include <ll/stdio.h> |
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77 | #include <kernel/types.h> |
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78 | #include <kernel/model.h> |
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79 | #include <kernel/mem.h> |
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80 | #include <signal.h> |
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81 | #include <kernel/var.h> |
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82 | #include <errno.h> |
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83 | |||
84 | |||
85 | /*---------------------------------------------------------------------*/ |
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86 | /* Debug stuff */ |
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87 | /*---------------------------------------------------------------------*/ |
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88 | |||
89 | /* if a source use printk() it should include log.h not func.h */ |
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90 | #include <kernel/log.h> |
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91 | |||
92 | /*---------------------------------------------------------------------*/ |
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93 | /* Kernel global functions: initialization & termination... */ |
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94 | /*---------------------------------------------------------------------*/ |
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95 | |||
96 | /*+ this function is called by __kernel_init__. |
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97 | It register the modules in the system at init time +*/ |
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98 | TIME __kernel_register_levels__(void *arg); |
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99 | |||
100 | /*+ This function returns a level_des **. the value returned shall be |
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101 | used to register a level module. The function shall be called only at |
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102 | module registration time. It assume that the system is not yet |
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103 | initialized, so we shall not call sys_abort... +*/ |
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104 | LEVEL level_alloc_descriptor(); |
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105 | |||
106 | /*+ This function returns a resource_des **. the value returned shall be |
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107 | used to register a resource module. The function shall be called only at |
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108 | module registration time. It assume that the system is not yet |
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109 | initialized, so we shall not call sys_abort... +*/ |
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110 | RLEVEL resource_alloc_descriptor(); |
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111 | |||
112 | /*+ This function compute the command line parameters from the multiboot_info |
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113 | NOTE: this function modify the multiboot struct, so this function and |
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114 | __call_main__ are mutually exclusives!!! +*/ |
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115 | void __compute_args__(struct multiboot_info *mbi, int *_argc, char **_argv); |
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116 | |||
117 | /*+ This function calls the standard C main() function, with a |
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118 | parameter list up to 100 parameters +*/ |
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119 | int __call_main__(struct multiboot_info *mb); |
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120 | |||
121 | /*+ This task initialize the system and calls the main() with |
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122 | __call_mail__ . |
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123 | It should be created by a level registered in the system by |
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124 | __kernel_register_levels__ +*/ |
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125 | TASK __init__(void *arg); |
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126 | |||
127 | /*+ Use this function to post your own exit operations |
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128 | (when uses some defines contained in const.h) +*/ |
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129 | int sys_atrunlevel(void (*func_code)(void *),void *parm, BYTE when); |
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130 | |||
131 | /*+ These functions can be used to set a nice (I hope) default |
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132 | signal handler. If not used, they are not linked. |
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133 | They returns -1 if an error occurred, as done by the |
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134 | sigaction primitive. +*/ |
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135 | int set_exchandler_grx(); |
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136 | int set_exchandler_text(); |
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137 | |||
138 | /*---------------------------------------------------------------------*/ |
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29 | pj | 139 | /* Kernel global functions: scheduler, */ |
2 | pj | 140 | /*---------------------------------------------------------------------*/ |
141 | |||
142 | /*+ This is the generic scheduler. |
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143 | The scheduler calls the appropriates level schedulers and then |
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144 | dispatch the task chosen. +*/ |
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145 | void scheduler(void); |
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146 | |||
147 | /*+ called in the events to force the system to execute the scheduler at |
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148 | the end of an event list +*/ |
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149 | void event_need_reschedule(); |
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150 | |||
151 | void task_makefree(void *ret); |
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152 | void check_killed_async(void); |
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153 | |||
154 | int guarantee(); |
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155 | |||
156 | void runlevel_init(); |
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157 | void call_runlevel_func(int runlevel, int aborting); |
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158 | |||
159 | // in kill.c |
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160 | void kill_user_tasks(); |
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161 | |||
162 | void event_resetepilogue(); |
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163 | |||
164 | |||
165 | void call_task_specific_data_destructors(); |
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166 | void task_specific_data_init(); |
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167 | |||
168 | // in kill.c |
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169 | void register_cancellation_point(int (*func)(PID p, void *arg), void *arg); |
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170 | |||
171 | // in signal.c |
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172 | void register_interruptable_point(int (*func)(PID p, void *arg), void *arg); |
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173 | |||
174 | |||
175 | /*---------------------------------------------------------------------*/ |
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176 | /* Kernel VM hooks */ |
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177 | /*---------------------------------------------------------------------*/ |
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178 | |||
179 | /* this hooks redefines the VM functions to use them into the kernel... |
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180 | |||
181 | the only VM functions called directly from the kernel are VM_init and |
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182 | VM_end |
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183 | */ |
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184 | |||
185 | /* Context management routines */ |
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186 | #define kern_context_create ll_context_create |
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187 | #define kern_context_delete ll_context_delete |
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188 | |||
189 | extern __inline__ CONTEXT kern_context_save() |
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190 | { |
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191 | cli(); |
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192 | return ll_context_from(); |
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193 | } |
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194 | |||
195 | /*+ this functions are called every time a context is changed +*/ |
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196 | void kern_after_dispatch(void); |
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197 | |||
198 | /* Warning: if modified, modify also: |
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199 | - task_join |
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200 | - cond_wait |
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201 | - cond_timedwait |
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202 | - internal_sem_wait |
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203 | */ |
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204 | extern __inline__ void kern_context_load(c) |
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205 | { |
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206 | ll_context_to(c); |
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207 | kern_after_dispatch(); |
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208 | sti(); |
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209 | } |
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210 | |||
211 | |||
212 | /* Interrupt enabling/disabling */ |
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213 | #define kern_cli cli |
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214 | #define kern_sti sti |
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215 | |||
216 | /* Interrupt enabling/disabling with flag save */ |
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217 | #define kern_fsave ll_fsave |
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218 | #define kern_frestore ll_frestore |
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219 | |||
220 | /* interrupt handling */ |
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221 | #define kern_irq_unmask VM_irq_unmask |
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222 | #define kern_irq_mask VM_irq_mask |
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223 | |||
224 | extern __inline__ int kern_event_post(const struct timespec *time, |
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225 | void (*handler)(void *p), |
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226 | void *par) |
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227 | { |
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228 | int e; |
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229 | e = event_post(*time,handler,par); |
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230 | |||
231 | if (e == -1) |
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232 | kern_raise(XNOMORE_EVENTS,exec_shadow); |
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233 | |||
234 | return e; |
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235 | } |
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236 | |||
237 | /*+ the default capacity timer used by the kernel... +*/ |
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238 | void capacity_timer(void *arg); |
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239 | |||
240 | |||
241 | #define kern_printf message |
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242 | |||
243 | /*---------------------------------------------------------------------*/ |
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244 | /* Kernel global functions: IRQ, errors and exception handling */ |
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245 | /*---------------------------------------------------------------------*/ |
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246 | |||
247 | /*+ Generic exception trapping routine +*/ |
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248 | void act_exc(int code); |
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249 | |||
250 | /* |
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251 | * User level interrupt/exception primitives |
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252 | */ |
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253 | |||
254 | /*+ Interrupt handler installation +*/ |
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255 | int handler_set(int no, void (*fast)(int), PID pi); |
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256 | |||
257 | /*+ Interrupt handler removal +*/ |
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258 | int handler_remove(int no); |
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259 | |||
260 | |||
261 | /*---------------------------------------------------------------------*/ |
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262 | /* System management primitives */ |
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263 | /*---------------------------------------------------------------------*/ |
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264 | |||
265 | /*+ Close the system & return to HOST OS. |
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266 | Can be called from all the tasks... |
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267 | The first time it is called it jumps to the global context |
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268 | The second time it jumps only if there are no system task remaining |
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269 | The error code passed is 0... (it is saved on the first call!!!) +*/ |
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270 | void sys_end(void); |
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271 | |||
272 | /*+ Close the system & return to HOST OS. |
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273 | Can be called from all the tasks... |
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274 | The first time it is called it works as the sys_end |
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275 | The second time it jumps every time |
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276 | The error code passed is 0... +*/ |
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277 | void sys_abort(int err); |
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278 | |||
279 | /* The system implements also exit and _exit as a redefinition of sys_end |
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280 | This is not the correct behaviour, and should be fixed. |
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281 | The definitions for these functions are in kernel/kern.c |
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282 | */ |
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283 | |||
284 | /*+ Print a message then call sys_abort(333). |
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285 | Can be called from all the tasks... +*/ |
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286 | void sys_panic(const char * fmt, ...) __attribute__ ((format (printf, 1, 2))); |
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287 | |||
288 | /*+ prints an error message (see perror.c) +*/ |
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289 | void perror (const char *s); |
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290 | |||
291 | /*+ Convert a status in a string. Useful for sys_status and level_status +*/ |
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292 | char *status_to_a(WORD status); |
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293 | |||
294 | /*+ this primitive prints the status of the system. cw contains a set of |
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295 | the statuses to be prompted... see const.h +*/ |
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296 | void sys_status(DWORD cw); |
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297 | |||
298 | /*+ sys_status flags +*/ |
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299 | #define CLOCK_STATUS 1 |
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300 | #define SCHED_STATUS 2 |
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301 | #define MEM_STATUS 4 |
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302 | |||
303 | /*+ this primitive returns the time read from the system timer +*/ |
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304 | TIME sys_gettime(struct timespec *t); |
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305 | |||
306 | /*---------------------------------------------------------------------*/ |
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307 | /* Jet management primitives */ |
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308 | /*---------------------------------------------------------------------*/ |
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309 | |||
310 | /*+ This primitive returns the maximum execution time and the total |
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311 | execution time from the task_create or the last jet_delstat |
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312 | It returns also the number of instances to use to calculate the mean |
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313 | time and the current job execution time. |
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314 | The value returned is 0 if all ok, -1 if the PID is not correct or |
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315 | the task doesn't have the JET_ENABLE bit set. |
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316 | +*/ |
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317 | int jet_getstat(PID p, TIME *sum, TIME *max, int *n, TIME *curr); |
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318 | |||
319 | /*+ This primitive reset to 0 the maximum execution time and the mean |
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320 | execution time of the task p, and reset to 0 all the entries in |
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321 | jet_table. |
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322 | The value returned is 0 if all ok, -1 if the PID is not correct or |
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323 | the task doesn't have the JET_ENABLE bit set. +*/ |
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324 | int jet_delstat(PID p); |
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325 | |||
326 | /*+ This primitive returns the last n values of the task execution time |
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327 | recorded after the last call to jet_gettable or jet_delstat. |
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328 | If n is |
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329 | <0 it will be set only the last values inserted in the table |
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330 | since the last call of jet_gettable. |
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331 | >0 it will be set up to JET_TABLE_DIM datas. |
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332 | |||
333 | The value returned is -1 if the PID is not correct or |
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334 | the task doesn't have the JET_ENABLE bit set, otherwise it returns the |
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335 | number of values set in the parameter table. |
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336 | (can be from 0 to JET_TABLE_DIM-1) |
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337 | +*/ |
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338 | int jet_gettable(PID p, TIME *table, int n); |
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339 | |||
340 | /*+ This function updates the jet information. +*/ |
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341 | void jet_update_slice(TIME t); |
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342 | |||
343 | /*+ This function updates the jet information at the task end period |
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344 | it is called in task_endcycle and task_sleep +*/ |
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345 | void jet_update_endcycle(); |
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346 | |||
347 | /*---------------------------------------------------------------------*/ |
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348 | /* Task management primitives */ |
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349 | /*---------------------------------------------------------------------*/ |
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350 | |||
351 | |||
352 | /*+ This primitive: |
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353 | - Reserve a task descriptor |
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354 | - Create the task based on the task model passed |
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355 | - Initialize the resources used by the task |
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356 | - Guarantees the task set |
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357 | +*/ |
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358 | PID task_createn(char *name, /*+ the symbolic name of the task +*/ |
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359 | TASK (*body)(), /*+ a pointer to the task body +*/ |
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360 | TASK_MODEL *m, /*+ the task model +*/ |
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361 | /*+ the resources models, a list +*/ |
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362 | ...); /*+ of models terminated by NULL +*/ |
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363 | |||
364 | |||
365 | /*+ a redefinition of task_createn +*/ |
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366 | extern __inline PID task_create(char *name, TASK (*body)(), |
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367 | void *m, void *r) |
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368 | { |
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369 | return task_createn(name, body, (TASK_MODEL *)m, (RES_MODEL *)r, NULL); |
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370 | } |
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371 | |||
372 | |||
373 | /* This function allow to create a set of tasks without guarantee. |
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374 | It must be called with interrupts disabled and it must be used with |
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375 | group_create_accept and group_create_reject. |
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376 | |||
377 | This function allocates a task descriptor and fills it. |
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378 | After that, the guarantee() function should be called to check for task(s) |
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379 | admission. |
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380 | Next, each task created with group_create must be accepted with a call to |
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381 | group_create_accept() or rejected with a call to group_create_reject. |
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382 | |||
383 | The function returns the PID of the allocated descriptor, or NIL(-1) |
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384 | if the descriptor cannot be allocated or some problems arises the creation. |
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385 | If -1 is returned, errno is set to a value that represent the error: |
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386 | ENO_AVAIL_TASK -> no free descriptors available |
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387 | ENO_AVAIL_SCHEDLEVEL -> there were no scheduling modules that can handle |
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388 | the TASK_MODEL *m passed as parameter |
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389 | ETASK_CREATE -> there was an error during the creation of the |
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390 | task into the scheduling module |
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391 | ENO_AVAIL_RESLEVEL -> there were no resource modules that can handle |
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392 | one of the RES_MODEL * passed as parameter |
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393 | */ |
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394 | PID group_create(char *name, |
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395 | TASK (*body)(), |
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396 | TASK_MODEL *m, |
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397 | ...); |
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398 | |||
399 | |||
400 | /* |
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401 | This function should be called when a task created with group_create |
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402 | is successfully guaranteed and accepted in the system. |
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403 | This function finish the creation process allocating the last resources |
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404 | for the task (i.e., the stack and the context). |
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405 | it returns: |
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406 | |||
407 | -1 if something goes wrong. In this case, THE TASK IS AUTOMATICALLY REJECTED |
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408 | AND THE GROUP_CREATE_REJECT MUST NOT BE CALLED. |
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409 | errno is set to a value that explains the problem occurred: |
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410 | |||
411 | ENO_AVAIL_STACK_MEM -> No stack memory available for the task |
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412 | ENO_AVAIL_TSS -> No context available for the task (This is a |
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413 | CRITICAL error, and usually never happens...) |
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414 | */ |
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415 | int group_create_accept(PID i, TASK_MODEL *m); |
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416 | |||
417 | /* |
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418 | This function should be called when a task created with group_create |
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419 | can not be successfully guaranteed. |
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420 | This function reject the task from the system. |
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421 | You cannot use the PID of a rejected task after this call. |
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422 | */ |
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423 | void group_create_reject(PID i); |
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424 | |||
425 | /*+ |
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426 | It blocks all explicit activation of a task made with task_activate and |
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427 | group_activate. These activations are registered in an internal counter, |
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428 | returned by task_unblock_activation. |
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429 | it returns 0 if all ok, or -1 otherwise. errno is set accordingly. |
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430 | +*/ |
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431 | int task_block_activation(PID p); |
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432 | |||
433 | /*+ |
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434 | It unblocks all explicit activations of a task, and returns the number of |
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435 | "frozen" activations. It not call the task_activate!!!! |
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436 | it returns -1 if an error occurs. errno is set accordingly. |
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437 | +*/ |
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438 | int task_unblock_activation(PID p); |
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439 | |||
440 | |||
441 | /*+ Activate a task specified via pid returned from task_create +*/ |
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442 | int task_activate(PID pid); |
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443 | |||
444 | /*+ Kill a task specified via pid returned from task_create +*/ |
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445 | int task_kill(PID pid); |
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446 | |||
447 | /*+ |
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448 | This primitive autokills the excuting task; it was used to avoid |
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449 | that returning from a task cause a jmp to an unpredictable location. |
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450 | |||
451 | Now it is obsolete, the task_create_stub do all the works. |
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452 | |||
453 | It is used by the Posix layer to implement pthread_exit |
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454 | +*/ |
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455 | void task_abort(void *returnvalue); |
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456 | |||
457 | /*+ Creates a cancellation point in the calling task +*/ |
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458 | void task_testcancel(void); |
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459 | |||
460 | /*+ Set the cancellation state of the task +*/ |
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461 | int task_setcancelstate(int state, int *oldstate); |
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462 | |||
463 | /*+ Set the cancellation type of the task +*/ |
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464 | int task_setcanceltype(int type, int *oldtype); |
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465 | |||
466 | /*+ this function suspends execution of the calling task until the target |
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467 | task terminates, unless the target task has already terminated. |
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468 | It works like the pthread_join +*/ |
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469 | int task_join(PID p, void **value); |
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470 | |||
471 | /*+ this function set the detach state of a task to joinable. This function |
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472 | is not present in Posix standard... |
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473 | returns ESRCH if p is non correct +*/ |
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474 | int task_joinable(PID p); |
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475 | |||
476 | /*+ this function set the detach state of a task to detached. This function |
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477 | works as the posix's pthread_detach |
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478 | returns EINVAL if p can't be joined (or currently a task has done a |
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479 | join on it (condition not provided in posix) |
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480 | ESRCH if p is not correct +*/ |
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481 | int task_unjoinable(PID p); |
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482 | |||
483 | /*+ Disable the preemption mechanism on the task. |
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484 | This primitive is very dangerous!!!! +*/ |
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485 | void task_nopreempt(void); |
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486 | |||
487 | /*+ Enable the preemption mechanism on the task. +*/ |
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488 | void task_preempt(void); |
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489 | |||
490 | /*+ This function signals to the kernel that the current istance of |
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491 | the task (periodic or aperiodic) is ended; so the task can be |
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492 | suspended until it is activated again. Pending activations may be saved |
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493 | depending on the task model +*/ |
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494 | void task_endcycle(void); |
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495 | |||
496 | /*+ This function suspend the actual task until an explicit activation |
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497 | Pending activations are discarded +*/ |
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498 | void task_sleep(void); |
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499 | |||
500 | /*+ This primitives refers the group id which is supplied |
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501 | by the application, not by the kernel +*/ |
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502 | int group_activate(WORD g); |
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503 | int group_kill(WORD g); |
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504 | |||
505 | |||
506 | /*---------------------------------------------------------------------*/ |
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507 | /* Mutex primitives */ |
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508 | /*---------------------------------------------------------------------*/ |
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509 | |||
510 | /* This primitives manages a mutex in the system. |
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511 | The behavior of the functions is similar to the POSIX ones. */ |
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512 | |||
513 | |||
514 | /*+ Alloc a mutex descriptor +*/ |
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515 | int mutex_init(mutex_t *mutex, const mutexattr_t *attr); |
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516 | |||
517 | /*+ Free a mutex descriptor +*/ |
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518 | int mutex_destroy(mutex_t *mutex); |
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519 | |||
520 | /*+ Block wait +*/ |
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521 | int mutex_lock(mutex_t *mutex); |
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522 | |||
523 | /*+ Non-block wait +*/ |
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524 | int mutex_trylock(mutex_t *mutex); |
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525 | |||
526 | /*+ unlock primitive +*/ |
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527 | int mutex_unlock(mutex_t *mutex); |
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528 | |||
529 | /*---------------------------------------------------------------------*/ |
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530 | /* Condition variables */ |
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531 | /*---------------------------------------------------------------------*/ |
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532 | |||
533 | /*+ Initialization of the condition variable +*/ |
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534 | int cond_init(cond_t *cond); |
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535 | |||
536 | /*+ free a condition variable descriptor +*/ |
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537 | int cond_destroy(cond_t *cond); |
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538 | |||
539 | /*+ signal on a condition variable, it unlocks only one task +*/ |
||
540 | int cond_signal(cond_t *cond); |
||
541 | |||
542 | /*+ broadcast on a condition variable, it unlocks all the blocked tasks +*/ |
||
543 | int cond_broadcast(cond_t *cond); |
||
544 | |||
545 | /*+ wait on a condition variable +*/ |
||
546 | int cond_wait(cond_t *cond, mutex_t *mutex); |
||
547 | |||
548 | /*+ wait on a condition variable (with timer) +*/ |
||
549 | int cond_timedwait(cond_t *cond, mutex_t *mutex, |
||
550 | const struct timespec *abstime); |
||
551 | |||
552 | /*---------------------------------------------------------------------*/ |
||
553 | /* Task specific data primitives */ |
||
554 | /*---------------------------------------------------------------------*/ |
||
555 | |||
556 | /* they are similar to the POSIX standard */ |
||
557 | |||
558 | int task_key_create(task_key_t *key, void (*destructor)(void *)); |
||
559 | void *task_getspecific(task_key_t key); |
||
560 | int task_setspecific(task_key_t key, const void *value); |
||
561 | int task_key_delete(task_key_t key); |
||
562 | |||
563 | /*---------------------------------------------------------------------*/ |
||
564 | /* Task cancellation handlers */ |
||
565 | /*---------------------------------------------------------------------*/ |
||
566 | |||
567 | /*+ push the specified cancellation cleanup handler routine onto |
||
568 | the cancellation cleanup stack |
||
569 | void task_cleanup_push(void (*routine)(void *), void *arg); +*/ |
||
570 | #define task_cleanup_push(rtn,arg) { \ |
||
571 | struct _task_handler_rec __cleanup_handler, **__head; \ |
||
572 | __cleanup_handler.f = rtn; \ |
||
573 | __cleanup_handler.a = arg; \ |
||
574 | __head = task_getspecific(0); \ |
||
575 | __cleanup_handler.next = *__head; \ |
||
576 | *__head = &__cleanup_handler; |
||
577 | |||
578 | /*+ |
||
579 | removes the routine at the top of the cancellation cleanup stack |
||
580 | of the calling thread |
||
581 | void task_cleanup_pop(int execute); +*/ |
||
582 | #define task_cleanup_pop(ex) \ |
||
583 | *__head = __cleanup_handler.next; \ |
||
584 | if (ex) (*__cleanup_handler.f) (__cleanup_handler.a); \ |
||
585 | } |
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586 | |||
587 | #endif /* __FUNC_H__ */ |