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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 | * (see the web pages for full authors list) |
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11 | * |
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12 | * ReTiS Lab (Scuola Superiore S.Anna - Pisa - Italy) |
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13 | * |
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14 | * http://www.sssup.it |
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15 | * http://retis.sssup.it |
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16 | * http://shark.sssup.it |
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17 | */ |
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18 | |||
19 | /** |
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20 | ------------ |
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21 | CVS : $Id: activate.c,v 1.1.1.1 2002-03-29 14:12:51 pj Exp $ |
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22 | |||
23 | File: $File$ |
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24 | Revision: $Revision: 1.1.1.1 $ |
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25 | Last update: $Date: 2002-03-29 14:12:51 $ |
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26 | ------------ |
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27 | |||
28 | task_activate & group_activate |
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29 | |||
30 | **/ |
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31 | |||
32 | /* |
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33 | * Copyright (C) 2000 Paolo Gai |
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34 | * |
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35 | * This program is free software; you can redistribute it and/or modify |
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36 | * it under the terms of the GNU General Public License as published by |
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37 | * the Free Software Foundation; either version 2 of the License, or |
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38 | * (at your option) any later version. |
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39 | * |
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40 | * This program is distributed in the hope that it will be useful, |
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41 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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42 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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43 | * GNU General Public License for more details. |
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44 | * |
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45 | * You should have received a copy of the GNU General Public License |
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46 | * along with this program; if not, write to the Free Software |
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47 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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48 | * |
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49 | */ |
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50 | |||
51 | #include <stdarg.h> |
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52 | #include <ll/ll.h> |
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53 | #include <ll/stdlib.h> |
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54 | #include <ll/stdio.h> |
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55 | #include <ll/string.h> |
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56 | #include <kernel/config.h> |
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57 | #include <kernel/model.h> |
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58 | #include <kernel/const.h> |
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59 | #include <sys/types.h> |
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60 | #include <kernel/types.h> |
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61 | #include <kernel/descr.h> |
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62 | #include <errno.h> |
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63 | #include <kernel/var.h> |
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64 | #include <kernel/func.h> |
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65 | #include <kernel/trace.h> |
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66 | |||
67 | /*+ |
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68 | Activates a single task |
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69 | +*/ |
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70 | int task_activate(PID p) |
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71 | { |
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72 | LEVEL l; /* the level of the task p */ |
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73 | |||
74 | /* some controls on the task p */ |
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75 | if (p<0 || p>=MAX_PROC) { |
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76 | errno = EUNVALID_TASK_ID; |
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77 | return -1; |
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78 | } |
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79 | if (proc_table[p].status == FREE) { |
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80 | errno = EUNVALID_TASK_ID; |
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81 | return -1; |
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82 | } |
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83 | |||
84 | /*+ if we are calling the runlevel functions the system is |
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85 | into the global_context... we only have to call |
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86 | the task_activate of the level +*/ |
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87 | if (calling_runlevel_func) { |
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88 | SYS_FLAGS f; |
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89 | f=kern_fsave(); |
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90 | if (proc_table[p].control & FREEZE_ACTIVATION) |
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91 | proc_table[p].frozen_activations++; |
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92 | else { |
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93 | l = proc_table[p].task_level; |
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94 | level_table[l]->task_activate(l,p); |
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95 | } |
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96 | kern_frestore(f); |
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97 | return 0; |
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98 | } |
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99 | |||
100 | |||
101 | /* Begin activate */ |
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102 | if (ll_ActiveInt()) { |
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103 | SYS_FLAGS f; |
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104 | f = kern_fsave(); |
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105 | if (proc_table[p].control & FREEZE_ACTIVATION) |
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106 | proc_table[p].frozen_activations++; |
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107 | else { |
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108 | l = proc_table[p].task_level; |
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109 | level_table[l]->task_activate(l,p); |
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110 | event_need_reschedule(); |
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111 | } |
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112 | kern_frestore(f); |
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113 | } |
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114 | else { |
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115 | proc_table[exec_shadow].context = kern_context_save(); |
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116 | |||
117 | if (proc_table[p].control & FREEZE_ACTIVATION) |
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118 | proc_table[p].frozen_activations++; |
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119 | else { |
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120 | /* tracer stuff */ |
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121 | trc_logevent(TRC_ACTIVATE,&p); |
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122 | l = proc_table[p].task_level; |
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123 | level_table[l]->task_activate(l,p); |
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124 | |||
125 | /* Preempt if necessary */ |
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126 | scheduler(); |
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127 | } |
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128 | kern_context_load(proc_table[exec_shadow].context); |
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129 | } |
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130 | |||
131 | return 0; |
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132 | } |
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133 | |||
134 | |||
135 | /*+ |
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136 | Activate a group of tasks, identified by the group g |
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137 | It returns -1 if the group is not valid |
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138 | +*/ |
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139 | int group_activate(WORD g) |
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140 | { |
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141 | PID i; /* a counter */ |
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142 | register LEVEL l; /* a level value */ |
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143 | |||
144 | if (g == 0) { |
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145 | errno = EUNVALID_GROUP; |
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146 | return -1; |
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147 | } |
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148 | |||
149 | /*+ if we are calling the runlevel functions the system is |
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150 | into the global_context... we only have to call |
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151 | the task_activate of the level +*/ |
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152 | if (calling_runlevel_func) { |
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153 | SYS_FLAGS f; |
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154 | f=kern_fsave(); |
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155 | |||
156 | for (i=0 ; i<MAX_PROC; i++) |
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157 | if (proc_table[i].group == g) { |
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158 | if (proc_table[i].control & FREEZE_ACTIVATION) { |
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159 | proc_table[i].frozen_activations++; |
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160 | continue; |
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161 | } |
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162 | /* tracer stuff */ |
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163 | trc_logevent(TRC_ACTIVATE,&i); |
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164 | l = proc_table[i].task_level; |
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165 | level_table[l]->task_activate(l,i); |
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166 | } |
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167 | |||
168 | kern_frestore(f); |
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169 | return 0; |
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170 | } |
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171 | |||
172 | if (ll_ActiveInt()) { |
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173 | SYS_FLAGS f; |
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174 | f=kern_fsave(); |
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175 | for (i=0 ; i<MAX_PROC; i++) |
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176 | if (proc_table[i].group == g) { |
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177 | if (proc_table[i].control & FREEZE_ACTIVATION) { |
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178 | proc_table[i].frozen_activations++; |
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179 | continue; |
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180 | } |
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181 | /* tracer stuff */ |
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182 | trc_logevent(TRC_ACTIVATE,&i); |
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183 | l = proc_table[i].task_level; |
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184 | level_table[l]->task_activate(l,i); |
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185 | } |
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186 | event_need_reschedule(); |
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187 | kern_frestore(f); |
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188 | } |
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189 | else { |
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190 | proc_table[exec_shadow].context = kern_context_save(); |
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191 | |||
192 | for (i=0 ; i<MAX_PROC; i++) |
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193 | if (proc_table[i].group == g) { |
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194 | if (proc_table[i].control & FREEZE_ACTIVATION) { |
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195 | proc_table[i].frozen_activations++; |
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196 | continue; |
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197 | } |
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198 | l = proc_table[i].task_level; |
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199 | level_table[l]->task_activate(l,i); |
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200 | /* tracer stuff */ |
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201 | trc_logevent(TRC_ACTIVATE,&i); |
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202 | } |
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203 | |||
204 | scheduler(); |
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205 | kern_context_load(proc_table[exec_shadow].context); |
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206 | } |
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207 | return 0; |
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208 | } |