[dfbfa2b0] | 1 | /* |
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| 2 | * Thread Queue Handler |
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| 3 | * |
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| 4 | * |
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[3168deaa] | 5 | * COPYRIGHT (c) 1989-2008. |
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[dfbfa2b0] | 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 the file LICENSE in this distribution or at |
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[dd687d97] | 10 | * http://www.rtems.com/license/LICENSE. |
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[dfbfa2b0] | 11 | * |
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| 12 | * $Id$ |
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| 13 | */ |
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| 14 | |
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[a8eed23] | 15 | #if HAVE_CONFIG_H |
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| 16 | #include "config.h" |
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| 17 | #endif |
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| 18 | |
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[dfbfa2b0] | 19 | #include <rtems/system.h> |
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| 20 | #include <rtems/score/chain.h> |
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| 21 | #include <rtems/score/isr.h> |
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| 22 | #include <rtems/score/object.h> |
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| 23 | #include <rtems/score/states.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/tqdata.h> |
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| 27 | |
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| 28 | /*PAGE |
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| 29 | * |
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| 30 | * _Thread_queue_Dequeue |
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| 31 | * |
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| 32 | * This routine removes a thread from the specified threadq. If the |
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| 33 | * threadq discipline is FIFO, it unblocks a thread, and cancels its |
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| 34 | * timeout timer. Priority discipline is processed elsewhere. |
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| 35 | * |
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| 36 | * Input parameters: |
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| 37 | * the_thread_queue - pointer to threadq |
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| 38 | * |
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| 39 | * Output parameters: |
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| 40 | * returns - thread dequeued or NULL |
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| 41 | * |
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| 42 | * INTERRUPT LATENCY: |
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| 43 | * check sync |
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| 44 | */ |
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| 45 | |
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| 46 | Thread_Control *_Thread_queue_Dequeue( |
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| 47 | Thread_queue_Control *the_thread_queue |
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| 48 | ) |
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| 49 | { |
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[3168deaa] | 50 | Thread_Control *(*dequeue_p)( Thread_queue_Control * ); |
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[11c16a64] | 51 | Thread_Control *the_thread; |
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| 52 | ISR_Level level; |
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| 53 | Thread_blocking_operation_States sync_state; |
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[dfbfa2b0] | 54 | |
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[3168deaa] | 55 | if ( the_thread_queue->discipline == THREAD_QUEUE_DISCIPLINE_PRIORITY ) |
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| 56 | dequeue_p = _Thread_queue_Dequeue_priority; |
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| 57 | else /* must be THREAD_QUEUE_DISCIPLINE_FIFO */ |
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| 58 | dequeue_p = _Thread_queue_Dequeue_fifo; |
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[dfbfa2b0] | 59 | |
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[11c16a64] | 60 | the_thread = (*dequeue_p)( the_thread_queue ); |
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| 61 | _ISR_Disable( level ); |
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| 62 | if ( !the_thread ) { |
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| 63 | sync_state = the_thread_queue->sync_state; |
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| 64 | if ( (sync_state == THREAD_BLOCKING_OPERATION_TIMEOUT) || |
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| 65 | (sync_state == THREAD_BLOCKING_OPERATION_NOTHING_HAPPENED) ) { |
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| 66 | the_thread_queue->sync_state = THREAD_BLOCKING_OPERATION_SATISFIED; |
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| 67 | the_thread = _Thread_Executing; |
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| 68 | } |
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| 69 | } |
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| 70 | _ISR_Enable( level ); |
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| 71 | return the_thread; |
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[dfbfa2b0] | 72 | } |
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