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_Set_transient |
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32 | * |
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33 | * This kernel routine places the requested thread in the transient state |
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34 | * which will remove it from the ready queue, if necessary. No |
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35 | * rescheduling is necessary because it is assumed that the transient |
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36 | * state will be cleared before dispatching is enabled. |
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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 | * |
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41 | * Output parameters: NONE |
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42 | * |
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43 | * INTERRUPT LATENCY: |
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44 | * only case |
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45 | */ |
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46 | |
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47 | void _Thread_Set_transient( |
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48 | Thread_Control *the_thread |
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49 | ) |
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50 | { |
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51 | ISR_Level level; |
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52 | unsigned32 old_state; |
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53 | Chain_Control *ready; |
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54 | |
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55 | ready = the_thread->ready; |
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56 | _ISR_Disable( level ); |
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57 | |
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58 | old_state = the_thread->current_state; |
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59 | the_thread->current_state = _States_Set( STATES_TRANSIENT, old_state ); |
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60 | |
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61 | if ( _States_Is_ready( old_state ) ) { |
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62 | if ( _Chain_Has_only_one_node( ready ) ) { |
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63 | |
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64 | _Chain_Initialize_empty( ready ); |
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65 | _Priority_Remove_from_bit_map( &the_thread->Priority_map ); |
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66 | |
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67 | } else |
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68 | _Chain_Extract_unprotected( &the_thread->Object.Node ); |
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69 | } |
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70 | |
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71 | _ISR_Enable( level ); |
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72 | |
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73 | } |
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