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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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318 | giacomo | 21 | CVS : $Id: time.c,v 1.3 2003-11-05 15:05:12 giacomo Exp $ |
2 | pj | 22 | |
23 | File: $File$ |
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318 | giacomo | 24 | Revision: $Revision: 1.3 $ |
25 | Last update: $Date: 2003-11-05 15:05:12 $ |
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2 | pj | 26 | ------------ |
27 | |||
28 | This file contains the functions defined in time.h |
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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 | |||
52 | #include <ll/ll.h> |
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53 | #include <errno.h> |
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54 | #include <kernel/func.h> |
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55 | #include <pthread.h> |
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56 | #include <signal.h> |
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57 | #include <time.h> |
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58 | #include <limits.h> |
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59 | |||
60 | struct internal_timer_struct { |
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61 | struct sigevent evp; /* the sigevent MUST be allocated by the applic. */ |
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62 | int event; /* the timer event... the timer is disarmed when |
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63 | event == -1 */ |
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64 | struct timespec period; /* period for periodic timers */ |
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65 | struct timespec current; /* time at whitch the event is posted */ |
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66 | |||
67 | /* these fields are used only if SIGEV_SIGNAL is specified */ |
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68 | int signal; /* the reserved signal entry for the timer */ |
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69 | int overrun; /* the signal overrun counter */ |
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70 | |||
71 | int used; /* 1 if the timer is used */ |
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72 | int next; |
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73 | }; |
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74 | |||
75 | |||
76 | /* the timer table */ |
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77 | static struct internal_timer_struct timer_table[TIMER_MAX]; |
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78 | |||
79 | /* the free timer pointer */ |
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80 | static int timerqueue_free; |
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81 | |||
82 | void TIMER_register_module() |
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83 | { |
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84 | int x; |
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85 | |||
86 | for (x = 0; x < TIMER_MAX; x++) { |
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87 | timer_table[x].event = -1; /* invalid value */ |
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88 | NULL_TIMESPEC(&timer_table[x].period); |
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89 | timer_table[x].used = 0; |
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90 | timer_table[x].overrun = 0; |
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91 | // evp is not initialized |
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92 | timer_table[x].next = x+1; |
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93 | } |
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94 | timer_table[TIMER_MAX-1].next = -1; |
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95 | timerqueue_free = 0; |
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96 | |||
97 | } |
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98 | |||
99 | /*---------------------------------------------------------------------*/ |
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100 | /* 14.2.1 - Clocks */ |
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101 | /*---------------------------------------------------------------------*/ |
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102 | |||
103 | int clock_settime(clockid_t clock_id, const struct timespec *tp) |
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104 | { |
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105 | if (clock_id != CLOCK_REALTIME) |
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106 | errno = EINVAL; |
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107 | else |
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108 | errno = EPERM; |
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109 | return -1; |
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110 | } |
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111 | |||
112 | int clock_gettime(clockid_t clock_id, struct timespec *tp) |
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113 | { |
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114 | if (clock_id != CLOCK_REALTIME) { |
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115 | errno = EINVAL; |
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116 | return -1; |
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117 | } |
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118 | |||
119 | sys_gettime(tp); |
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120 | return 0; |
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121 | } |
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122 | |||
123 | int clock_getres(clockid_t clock_id, struct timespec *res) |
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124 | { |
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125 | if (clock_id != CLOCK_REALTIME) { |
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126 | errno = EINVAL; |
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127 | return -1; |
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128 | } |
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129 | |||
130 | if (res) { |
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131 | /* 1 usec */ |
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132 | res->tv_sec = 0; |
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133 | res->tv_nsec = 1000; |
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134 | } |
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135 | |||
136 | return 0; |
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137 | } |
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138 | |||
139 | /*---------------------------------------------------------------------*/ |
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140 | /* 14.2.2 - Create a Per-Process Timer */ |
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141 | /*---------------------------------------------------------------------*/ |
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142 | |||
143 | int timer_create(clockid_t clock_id, struct sigevent *evp, timer_t *timerid) |
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144 | { |
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318 | giacomo | 145 | SYS_FLAGS f; |
146 | |||
2 | pj | 147 | if (clock_id != CLOCK_REALTIME) { |
148 | errno = EINVAL; |
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149 | return -1; |
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150 | } |
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151 | |||
318 | giacomo | 152 | f = kern_fsave(); |
2 | pj | 153 | |
154 | if (timerqueue_free == -1 || sigqueue_free == -1) { |
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318 | giacomo | 155 | kern_frestore(f); |
2 | pj | 156 | errno = EAGAIN; |
157 | return -1; |
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158 | } |
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159 | |||
160 | /* alloc a timer descriptor */ |
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161 | *timerid = timerqueue_free; |
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162 | timerqueue_free = timer_table[timerqueue_free].next; |
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163 | timer_table[*timerid].used = 1; |
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164 | |||
165 | /* alloc a signal descriptor and fill the timer struct */ |
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166 | if (!evp) { |
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167 | // set default data for the evp field |
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168 | timer_table[*timerid].evp.sigev_notify = SIGEV_SIGNAL; |
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169 | timer_table[*timerid].evp.sigev_signo = DEFAULT_TIMER_SIGNAL; |
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170 | timer_table[*timerid].evp.sigev_value.sival_int = *timerid; |
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171 | } |
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172 | else |
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173 | timer_table[*timerid].evp = *evp; |
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174 | |||
175 | if (timer_table[*timerid].evp.sigev_notify == SIGEV_SIGNAL) { |
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176 | // alloc a signal descriptor |
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177 | timer_table[*timerid].signal = sigqueue_free; |
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178 | sig_queue[sigqueue_free].flags |= USED_FOR_TIMER; |
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179 | sigqueue_free = sig_queue[sigqueue_free].next; |
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180 | } |
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181 | |||
182 | timer_table[*timerid].event = -1; |
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183 | |||
184 | NULL_TIMESPEC(&timer_table[*timerid].period); |
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185 | NULL_TIMESPEC(&timer_table[*timerid].current); |
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186 | |||
187 | timer_table[*timerid].overrun = 0; |
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188 | |||
318 | giacomo | 189 | kern_frestore(f); |
2 | pj | 190 | return 0; |
191 | } |
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192 | |||
193 | |||
194 | /*---------------------------------------------------------------------*/ |
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195 | /* 14.2.3 - Delete a Per-Process Timer */ |
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196 | /*---------------------------------------------------------------------*/ |
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197 | |||
198 | int timer_delete(timer_t timerid) |
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199 | { |
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318 | giacomo | 200 | SYS_FLAGS f; |
201 | |||
2 | pj | 202 | if (timerid < 0 || timerid >= TIMER_MAX) { |
203 | errno = EINVAL; |
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204 | return -1; |
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205 | } |
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206 | |||
318 | giacomo | 207 | f = kern_fsave(); |
2 | pj | 208 | |
209 | if (!timer_table[timerid].used) { |
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318 | giacomo | 210 | kern_frestore(f); |
2 | pj | 211 | errno = EINVAL; |
212 | return -1; |
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213 | } |
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214 | |||
215 | timer_table[timerid].used = 0; |
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216 | |||
217 | /* delete the event if the timer is armed */ |
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218 | if (timer_table[timerid].event != -1) |
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38 | pj | 219 | kern_event_delete(timer_table[timerid].event); |
2 | pj | 220 | |
221 | if (timer_table[timerid].evp.sigev_notify == SIGEV_SIGNAL) { |
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222 | if (!(sig_queue[ timer_table[timerid].signal ].flags & SIGNAL_POSTED)) { |
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223 | /* if the signal is not pending, we insert it into the sigqueue_free. |
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224 | instead, if it is pending, it will be inserted into the queue when |
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225 | delivered */ |
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226 | sig_queue[ timer_table[timerid].signal ].next = sigqueue_free; |
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227 | sigqueue_free = timer_table[timerid].signal; |
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228 | } |
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229 | |||
230 | /* reset the timer flags... */ |
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231 | sig_queue[ timer_table[timerid].signal ].flags &= |
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232 | ~(USED_FOR_TIMER | SIGNAL_POSTED); |
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233 | } |
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234 | |||
318 | giacomo | 235 | kern_frestore(f); |
2 | pj | 236 | return 0; |
237 | } |
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238 | |||
239 | /*---------------------------------------------------------------------*/ |
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240 | /* 14.2.4 - Per-Process Timers */ |
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241 | /*---------------------------------------------------------------------*/ |
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242 | |||
243 | void timer_timerfire(void *arg) |
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244 | { |
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245 | /* Now, we queue the signal: |
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246 | - if the signal is already pending, only increment the pending |
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247 | activations |
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248 | - if the signal isn't pending, |
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249 | - we insert the reserved signal into |
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250 | the sigqueue_free (so it will be popped by the sigqueue) |
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251 | - we set the posted flag (it will be resetted when the signal |
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252 | will be dispatched) |
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253 | */ |
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254 | |||
255 | int t = (int)arg; |
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256 | |||
257 | // kern_printf("*%d",t); |
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258 | // do the action required... |
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259 | if (timer_table[t].evp.sigev_notify == SIGEV_SIGNAL) { |
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260 | if (sig_queue[ timer_table[t].signal ].flags & SIGNAL_POSTED) { |
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261 | // the signal is already pending, increment the pending activations... |
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262 | if (timer_table[t].overrun != DELAYTIMER_MAX) |
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263 | timer_table[t].overrun++; |
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264 | } |
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265 | else { |
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266 | timer_table[t].overrun = 0; |
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267 | // there is no signal pending... post the signal!!! |
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268 | // This a dirty trick: The timer has allocated a signal descriptor, |
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269 | // then the timer put at the top of the free queue, |
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270 | // so sigqueue_internal pick the right number!!! |
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271 | sig_queue[ timer_table[t].signal ].next = sigqueue_free; |
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272 | sigqueue_free = timer_table[t].signal; |
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273 | sigqueue_internal(0, |
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274 | timer_table[t].evp.sigev_signo, |
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275 | timer_table[t].evp.sigev_value, |
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276 | SI_TIMER); |
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277 | // setting this flag is used for counting overruns... |
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278 | sig_queue[ timer_table[t].signal ].flags |= SIGNAL_POSTED; |
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279 | } |
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280 | |||
281 | } else if (timer_table[t].evp.sigev_notify == SIGEV_THREAD) { |
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282 | /* a new thread must be created; note that the pthread_create |
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283 | calls task_createn and task_activate; task_activate works into |
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284 | signal handlers and calls event_need_reschedule */ |
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285 | pthread_t new_thread; |
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286 | |||
287 | if (timer_table[t].evp.sigev_notify_attributes) |
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288 | pthread_create(&new_thread, |
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289 | timer_table[t].evp.sigev_notify_attributes, |
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290 | (void *(*)(void *))timer_table[t].evp.sigev_notify_function, |
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291 | timer_table[t].evp.sigev_value.sival_ptr); |
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292 | else { |
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293 | pthread_attr_t new_attr; |
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294 | // the task must be created detached |
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295 | pthread_attr_init(&new_attr); |
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296 | pthread_attr_setdetachstate(&new_attr, PTHREAD_CREATE_DETACHED); |
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297 | |||
298 | pthread_create(&new_thread, |
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299 | &new_attr, |
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300 | (void *(*)(void *))timer_table[t].evp.sigev_notify_function, |
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301 | &timer_table[t].evp.sigev_value); |
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302 | } |
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303 | } |
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304 | |||
305 | if (timer_table[t].period.tv_sec != 0 || |
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306 | timer_table[t].period.tv_nsec != 0) { |
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307 | struct timespec temp; |
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308 | |||
309 | TIMESPEC_ASSIGN(&temp,&timer_table[t].current); |
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310 | ADDTIMESPEC(&temp, &timer_table[t].period, &timer_table[t].current); |
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311 | |||
312 | timer_table[t].event = |
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313 | kern_event_post(&timer_table[t].current, |
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314 | timer_timerfire, |
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315 | (void *)t); |
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316 | /* kern_printf("(post e%d %d.%d)", t, |
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317 | timer_table[t].current.tv_sec, |
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318 | timer_table[t].current.tv_nsec/1000); */ |
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319 | } |
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320 | else |
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321 | timer_table[t].event = -1; |
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322 | } |
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323 | |||
324 | int timer_settime(timer_t timerid, int flags, const struct itimerspec *value, |
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325 | struct itimerspec *ovalue) |
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326 | { |
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327 | struct timespec ct; /* current time */ |
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328 | int ct_read = 0; /* we take the current time only once */ |
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318 | giacomo | 329 | SYS_FLAGS f; |
2 | pj | 330 | |
331 | if (timerid < 0 || timerid >= TIMER_MAX || !value) { |
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332 | errno = EINVAL; |
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333 | return -1; |
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334 | } |
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335 | |||
336 | if (value->it_interval.tv_nsec < 0 || |
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337 | value->it_interval.tv_nsec >= 1000000000) { |
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338 | errno = EINVAL; |
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339 | return -1; |
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340 | } |
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341 | |||
342 | if (value->it_value.tv_nsec < 0 || |
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343 | value->it_value.tv_nsec >= 1000000000) { |
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344 | errno = EINVAL; |
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345 | return -1; |
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346 | } |
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347 | |||
318 | giacomo | 348 | f = kern_fsave(); |
2 | pj | 349 | |
350 | if (!timer_table[timerid].used) { |
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318 | giacomo | 351 | kern_frestore(f); |
2 | pj | 352 | errno = EINVAL; |
353 | return -1; |
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354 | } |
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355 | |||
356 | if (ovalue) { |
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357 | if (timer_table[timerid].event == -1) |
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358 | /* the timer is disarmed, set it_value to 0 */ |
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359 | NULL_TIMESPEC(&ovalue->it_value); |
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360 | else { |
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361 | /* the timer is armed, return the remaining expiration time */ |
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38 | pj | 362 | kern_gettime(&ct); |
2 | pj | 363 | ct_read = 1; |
364 | SUBTIMESPEC(&timer_table[timerid].current, &ct, &ovalue->it_value); |
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365 | } |
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366 | /* and return the reactivation period */ |
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367 | TIMESPEC_ASSIGN(&ovalue->it_interval, &timer_table[timerid].period); |
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368 | } |
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369 | |||
370 | /* if it_value is 0, the timer shall be disarmed; if != 0, the timer is |
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371 | armed: in all the cases, the event must be deleted... */ |
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372 | if (timer_table[timerid].event != -1) |
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38 | pj | 373 | kern_event_delete(timer_table[timerid].event); |
2 | pj | 374 | |
375 | if (value->it_value.tv_sec != 0 || value->it_value.tv_nsec != 0) { |
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376 | /* it_value != 0 -> arm the timer! */ |
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377 | TIMESPEC_ASSIGN(&timer_table[timerid].period, &value->it_interval); |
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378 | |||
379 | if (flags & TIMER_ABSTIME) |
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380 | /* the time is absolute */ |
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381 | TIMESPEC_ASSIGN(&timer_table[timerid].current, &value->it_value); |
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382 | else { |
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383 | /* the time is relative to current time */ |
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384 | if (!ct_read) |
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38 | pj | 385 | kern_gettime(&ct); |
2 | pj | 386 | ADDTIMESPEC(&ct, &value->it_value, &timer_table[timerid].current); |
387 | } |
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388 | timer_table[timerid].event = |
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389 | kern_event_post(&timer_table[timerid].current, |
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390 | timer_timerfire, |
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391 | (void *)timerid); |
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392 | /* kern_printf("(post e%d %d.%d)", timerid, |
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393 | timer_table[timerid].current.tv_sec, |
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394 | timer_table[timerid].current.tv_nsec/1000); */ |
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395 | } |
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396 | |||
318 | giacomo | 397 | kern_frestore(f); |
2 | pj | 398 | return 0; |
399 | } |
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400 | |||
401 | int timer_gettime(timer_t timerid, struct itimerspec *value) |
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402 | { |
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403 | struct timespec ct; /* current time */ |
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318 | giacomo | 404 | SYS_FLAGS f; |
2 | pj | 405 | |
406 | if (timerid < 0 || timerid >= TIMER_MAX) { |
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407 | errno = EINVAL; |
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408 | return -1; |
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409 | } |
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410 | |||
318 | giacomo | 411 | f = kern_fsave(); |
2 | pj | 412 | |
413 | if (!timer_table[timerid].used) { |
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318 | giacomo | 414 | kern_frestore(f); |
2 | pj | 415 | errno = EINVAL; |
416 | return -1; |
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417 | } |
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418 | |||
419 | if (timer_table[timerid].event == -1) |
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420 | /* the timer is disarmed, set it_value to 0 */ |
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421 | NULL_TIMESPEC(&value->it_value); |
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422 | else { |
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423 | /* the timer is armed, return the remaining expiration time */ |
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38 | pj | 424 | kern_gettime(&ct); |
2 | pj | 425 | SUBTIMESPEC(&timer_table[timerid].current, &ct, &value->it_value); |
426 | } |
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427 | /* and return the reactivation period */ |
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428 | TIMESPEC_ASSIGN(&value->it_interval, &timer_table[timerid].period); |
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429 | |||
318 | giacomo | 430 | kern_frestore(f); |
2 | pj | 431 | return 0; |
432 | } |
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433 | |||
434 | int timer_getoverrun(timer_t timerid) |
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435 | { |
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436 | int returnvalue; |
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318 | giacomo | 437 | SYS_FLAGS f; |
2 | pj | 438 | |
439 | if (timerid < 0 || timerid >= TIMER_MAX) { |
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440 | errno = EINVAL; |
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441 | return -1; |
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442 | } |
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443 | |||
318 | giacomo | 444 | f = kern_fsave(); |
2 | pj | 445 | |
446 | if (!timer_table[timerid].used) { |
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318 | giacomo | 447 | kern_frestore(f); |
2 | pj | 448 | errno = EINVAL; |
449 | return -1; |
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450 | } |
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451 | |||
452 | returnvalue = timer_table[timerid].overrun; |
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318 | giacomo | 453 | kern_frestore(f); |
2 | pj | 454 | return returnvalue; |
455 | } |
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456 |