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) 1989-1998. |
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6 | * On-Line Applications Research Corporation (OAR). |
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7 | * Copyright assigned to U.S. Government, 1994. |
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8 | * |
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9 | * The license and distribution terms for this file may be |
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10 | * found in found in the file LICENSE in this distribution or at |
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11 | * http://www.OARcorp.com/rtems/license.html. |
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12 | * |
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13 | * $Id$ |
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14 | */ |
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15 | |
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16 | #include <rtems/system.h> |
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17 | #include <rtems/score/apiext.h> |
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18 | #include <rtems/score/context.h> |
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19 | #include <rtems/score/interr.h> |
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20 | #include <rtems/score/isr.h> |
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21 | #include <rtems/score/object.h> |
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22 | #include <rtems/score/priority.h> |
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23 | #include <rtems/score/states.h> |
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24 | #include <rtems/score/sysstate.h> |
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25 | #include <rtems/score/thread.h> |
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26 | #include <rtems/score/threadq.h> |
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27 | #include <rtems/score/userext.h> |
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28 | #include <rtems/score/wkspace.h> |
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29 | |
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30 | /*PAGE |
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31 | * |
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32 | * _Thread_Ready |
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33 | * |
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34 | * This kernel routine readies the requested thread, the thread chain |
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35 | * is adjusted. A new heir thread may be selected. |
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36 | * |
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37 | * Input parameters: |
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38 | * the_thread - pointer to thread control block |
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39 | * |
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40 | * Output parameters: NONE |
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41 | * |
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42 | * NOTE: This routine uses the "blocking" heir selection mechanism. |
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43 | * This insures the correct heir after a thread restart. |
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44 | * |
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45 | * INTERRUPT LATENCY: |
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46 | * ready chain |
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47 | * select heir |
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48 | */ |
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49 | |
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50 | void _Thread_Ready( |
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51 | Thread_Control *the_thread |
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52 | ) |
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53 | { |
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54 | ISR_Level level; |
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55 | Thread_Control *heir; |
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56 | |
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57 | _ISR_Disable( level ); |
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58 | |
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59 | the_thread->current_state = STATES_READY; |
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60 | |
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61 | _Priority_Add_to_bit_map( &the_thread->Priority_map ); |
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62 | |
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63 | _Chain_Append_unprotected( the_thread->ready, &the_thread->Object.Node ); |
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64 | |
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65 | _ISR_Flash( level ); |
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66 | |
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67 | _Thread_Calculate_heir(); |
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68 | |
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69 | heir = _Thread_Heir; |
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70 | |
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71 | if ( !_Thread_Is_executing( heir ) && _Thread_Executing->is_preemptible ) |
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72 | _Context_Switch_necessary = TRUE; |
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73 | |
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74 | _ISR_Enable( level ); |
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75 | } |
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