1 | /* |
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2 | * Thread Handler |
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3 | * |
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4 | * |
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5 | * COPYRIGHT (c) 1989-1999. |
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6 | * On-Line Applications Research Corporation (OAR). |
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7 | * |
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8 | * The license and distribution terms for this file may be |
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9 | * found in found in the file LICENSE in this distribution or at |
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10 | * http://www.OARcorp.com/rtems/license.html. |
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11 | * |
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12 | * $Id$ |
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13 | */ |
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14 | |
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15 | #include <rtems/system.h> |
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16 | #include <rtems/score/apiext.h> |
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17 | #include <rtems/score/context.h> |
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18 | #include <rtems/score/interr.h> |
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19 | #include <rtems/score/isr.h> |
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20 | #include <rtems/score/object.h> |
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21 | #include <rtems/score/priority.h> |
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22 | #include <rtems/score/states.h> |
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23 | #include <rtems/score/sysstate.h> |
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24 | #include <rtems/score/thread.h> |
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25 | #include <rtems/score/threadq.h> |
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26 | #include <rtems/score/userext.h> |
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27 | #include <rtems/score/wkspace.h> |
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28 | |
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29 | /*PAGE |
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30 | * |
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31 | * _Thread_Resume |
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32 | * |
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33 | * This kernel routine clears the SUSPEND state if the suspend_count |
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34 | * drops below one. If the force parameter is set the suspend_count |
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35 | * is forced back to zero. The thread ready chain is adjusted if |
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36 | * necessary and the Heir thread is set accordingly. |
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37 | * |
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38 | * Input parameters: |
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39 | * the_thread - pointer to thread control block |
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40 | * force - force the suspend count back to 0 |
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41 | * |
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42 | * Output parameters: NONE |
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43 | * |
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44 | * INTERRUPT LATENCY: |
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45 | * priority map |
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46 | * select heir |
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47 | */ |
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48 | |
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49 | |
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50 | void _Thread_Resume( |
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51 | Thread_Control *the_thread, |
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52 | boolean force |
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53 | ) |
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54 | { |
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55 | |
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56 | ISR_Level level; |
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57 | States_Control current_state; |
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58 | |
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59 | _ISR_Disable( level ); |
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60 | |
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61 | if ( force == TRUE ) |
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62 | the_thread->suspend_count = 0; |
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63 | else |
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64 | the_thread->suspend_count--; |
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65 | |
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66 | if ( the_thread->suspend_count > 0 ) { |
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67 | _ISR_Enable( level ); |
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68 | return; |
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69 | } |
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70 | |
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71 | current_state = the_thread->current_state; |
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72 | if ( current_state & STATES_SUSPENDED ) { |
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73 | current_state = |
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74 | the_thread->current_state = _States_Clear(STATES_SUSPENDED, current_state); |
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75 | |
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76 | if ( _States_Is_ready( current_state ) ) { |
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77 | |
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78 | _Priority_Add_to_bit_map( &the_thread->Priority_map ); |
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79 | |
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80 | _Chain_Append_unprotected(the_thread->ready, &the_thread->Object.Node); |
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81 | |
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82 | _ISR_Flash( level ); |
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83 | |
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84 | if ( the_thread->current_priority < _Thread_Heir->current_priority ) { |
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85 | _Thread_Heir = the_thread; |
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86 | if ( _Thread_Executing->is_preemptible || |
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87 | the_thread->current_priority == 0 ) |
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88 | _Context_Switch_necessary = TRUE; |
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89 | } |
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90 | } |
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91 | } |
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92 | |
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93 | _ISR_Enable( level ); |
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94 | } |
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