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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [exec/] [score/] [src/] [threadqdequeuefifo.c] - Rev 846
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/* * Thread Queue Handler * * * COPYRIGHT (c) 1989-1999. * On-Line Applications Research Corporation (OAR). * * The license and distribution terms for this file may be * found in the file LICENSE in this distribution or at * http://www.OARcorp.com/rtems/license.html. * * $Id: threadqdequeuefifo.c,v 1.2 2001-09-27 11:59:34 chris Exp $ */ #include <rtems/system.h> #include <rtems/score/chain.h> #include <rtems/score/isr.h> #include <rtems/score/object.h> #include <rtems/score/states.h> #include <rtems/score/thread.h> #include <rtems/score/threadq.h> #include <rtems/score/tqdata.h> /*PAGE * * _Thread_queue_Dequeue_fifo * * This routine removes a thread from the specified threadq. * * Input parameters: * the_thread_queue - pointer to threadq * * Output parameters: * returns - thread dequeued or NULL * * INTERRUPT LATENCY: * check sync * FIFO */ Thread_Control *_Thread_queue_Dequeue_fifo( Thread_queue_Control *the_thread_queue ) { ISR_Level level; Thread_Control *the_thread; _ISR_Disable( level ); if ( !_Chain_Is_empty( &the_thread_queue->Queues.Fifo ) ) { the_thread = (Thread_Control *) _Chain_Get_first_unprotected( &the_thread_queue->Queues.Fifo ); if ( !_Watchdog_Is_active( &the_thread->Timer ) ) { _ISR_Enable( level ); _Thread_Unblock( the_thread ); } else { _Watchdog_Deactivate( &the_thread->Timer ); _ISR_Enable( level ); (void) _Watchdog_Remove( &the_thread->Timer ); _Thread_Unblock( the_thread ); } #if defined(RTEMS_MULTIPROCESSING) if ( !_Objects_Is_local_id( the_thread->Object.id ) ) _Thread_MP_Free_proxy( the_thread ); #endif return the_thread; } switch ( the_thread_queue->sync_state ) { case THREAD_QUEUE_SYNCHRONIZED: case THREAD_QUEUE_SATISFIED: _ISR_Enable( level ); return NULL; case THREAD_QUEUE_NOTHING_HAPPENED: case THREAD_QUEUE_TIMEOUT: the_thread_queue->sync_state = THREAD_QUEUE_SATISFIED; _ISR_Enable( level ); return _Thread_Executing; } return NULL; /* this is only to prevent warnings */ }
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