1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief Create a Period |
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5 | * @ingroup ClassicRateMon Rate Monotonic Scheduler |
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6 | */ |
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7 | |
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8 | /* |
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9 | * COPYRIGHT (c) 1989-2007. |
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10 | * On-Line Applications Research Corporation (OAR). |
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11 | * |
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12 | * The license and distribution terms for this file may be |
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13 | * found in the file LICENSE in this distribution or at |
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14 | * http://www.rtems.org/license/LICENSE. |
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15 | */ |
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16 | |
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17 | #if HAVE_CONFIG_H |
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18 | #include "config.h" |
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19 | #endif |
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20 | |
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21 | #include <rtems/system.h> |
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22 | #include <rtems/rtems/status.h> |
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23 | #include <rtems/rtems/support.h> |
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24 | #include <rtems/score/isr.h> |
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25 | #include <rtems/rtems/ratemonimpl.h> |
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26 | #include <rtems/score/thread.h> |
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27 | #include <rtems/score/watchdogimpl.h> |
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28 | |
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29 | /* |
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30 | * rtems_rate_monotonic_create |
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31 | * |
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32 | * This directive creates a rate monotonic timer and performs |
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33 | * some initialization. |
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34 | * |
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35 | * Input parameters: |
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36 | * name - name of period |
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37 | * id - pointer to rate monotonic id |
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38 | * |
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39 | * Output parameters: |
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40 | * id - rate monotonic id |
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41 | * RTEMS_SUCCESSFUL - if successful |
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42 | * error code - if unsuccessful |
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43 | */ |
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44 | |
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45 | rtems_status_code rtems_rate_monotonic_create( |
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46 | rtems_name name, |
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47 | rtems_id *id |
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48 | ) |
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49 | { |
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50 | Rate_monotonic_Control *the_period; |
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51 | |
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52 | if ( !rtems_is_name_valid( name ) ) |
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53 | return RTEMS_INVALID_NAME; |
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54 | |
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55 | if ( !id ) |
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56 | return RTEMS_INVALID_ADDRESS; |
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57 | |
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58 | the_period = _Rate_monotonic_Allocate(); |
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59 | |
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60 | if ( !the_period ) { |
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61 | _Objects_Allocator_unlock(); |
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62 | return RTEMS_TOO_MANY; |
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63 | } |
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64 | |
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65 | _ISR_lock_Initialize( &the_period->Lock, "Rate Monotonic Period" ); |
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66 | _Priority_Node_initialize( &the_period->Priority, 0 ); |
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67 | _Priority_Node_set_inactive( &the_period->Priority ); |
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68 | |
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69 | the_period->owner = _Thread_Get_executing(); |
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70 | the_period->state = RATE_MONOTONIC_INACTIVE; |
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71 | |
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72 | _Watchdog_Preinitialize( &the_period->Timer, _Per_CPU_Get_by_index( 0 ) ); |
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73 | _Watchdog_Initialize( &the_period->Timer, _Rate_monotonic_Timeout ); |
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74 | |
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75 | _Rate_monotonic_Reset_statistics( the_period ); |
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76 | |
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77 | _Objects_Open( |
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78 | &_Rate_monotonic_Information, |
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79 | &the_period->Object, |
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80 | (Objects_Name) name |
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81 | ); |
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82 | |
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83 | *id = the_period->Object.id; |
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84 | _Objects_Allocator_unlock(); |
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85 | return RTEMS_SUCCESSFUL; |
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86 | } |
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