1 | /* |
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2 | * 3.4.1 Schedule Alarm, P1003.1b-1993, p. 79 |
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3 | * |
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4 | * COPYRIGHT (c) 1989-1999. |
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5 | * On-Line Applications Research Corporation (OAR). |
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6 | * |
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7 | * The license and distribution terms for this file may be |
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8 | * found in the file LICENSE in this distribution or at |
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9 | * http://www.rtems.com/license/LICENSE. |
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10 | * |
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11 | * $Id$ |
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12 | */ |
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13 | |
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14 | #if HAVE_CONFIG_H |
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15 | #include "config.h" |
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16 | #endif |
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17 | |
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18 | #include <pthread.h> |
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19 | /* #include <errno.h> */ |
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20 | |
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21 | #include <rtems/system.h> |
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22 | #include <rtems/posix/pthread.h> |
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23 | #include <rtems/posix/psignal.h> |
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24 | |
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25 | Watchdog_Control _POSIX_signals_Alarm_timer; |
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26 | |
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27 | /*PAGE |
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28 | * |
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29 | * _POSIX_signals_Alarm_TSR |
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30 | */ |
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31 | |
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32 | void _POSIX_signals_Alarm_TSR( |
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33 | Objects_Id id, |
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34 | void *argument |
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35 | ) |
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36 | { |
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37 | int status; |
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38 | |
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39 | status = kill( getpid(), SIGALRM ); |
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40 | /* XXX can't print from an ISR, should this be fatal? */ |
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41 | } |
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42 | |
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43 | unsigned int alarm( |
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44 | unsigned int seconds |
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45 | ) |
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46 | { |
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47 | unsigned int remaining = 0; |
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48 | Watchdog_Control *the_timer; |
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49 | |
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50 | the_timer = &_POSIX_signals_Alarm_timer; |
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51 | |
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52 | /* |
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53 | * Initialize the timer used to implement alarm(). |
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54 | */ |
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55 | |
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56 | if ( !the_timer->routine ) { |
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57 | _Watchdog_Initialize( the_timer, _POSIX_signals_Alarm_TSR, 0, NULL ); |
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58 | } else { |
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59 | switch ( _Watchdog_Remove( the_timer ) ) { |
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60 | case WATCHDOG_INACTIVE: |
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61 | case WATCHDOG_BEING_INSERTED: |
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62 | break; |
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63 | |
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64 | case WATCHDOG_ACTIVE: |
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65 | case WATCHDOG_REMOVE_IT: |
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66 | /* |
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67 | * The stop_time and start_time fields are snapshots of ticks since |
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68 | * boot. Since alarm() is dealing in seconds, we must account for |
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69 | * this. |
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70 | */ |
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71 | |
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72 | remaining = the_timer->initial - |
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73 | ((the_timer->stop_time - the_timer->start_time) / |
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74 | _TOD_Ticks_per_second); |
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75 | break; |
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76 | } |
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77 | } |
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78 | |
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79 | _Watchdog_Insert_seconds( the_timer, seconds ); |
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80 | |
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81 | return remaining; |
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82 | } |
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