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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [exec/] [score/] [src/] [coremsgsubmit.c] - Rev 619
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/* * CORE Message Queue Handler * * DESCRIPTION: * * This package is the implementation of the CORE Message Queue Handler. * This core object provides task synchronization and communication functions * via messages passed to queue objects. * * 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: coremsgsubmit.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/coremsg.h> #include <rtems/score/states.h> #include <rtems/score/thread.h> #include <rtems/score/wkspace.h> #if defined(RTEMS_MULTIPROCESSING) #include <rtems/score/mpci.h> #endif /*PAGE * * _CORE_message_queue_Submit * * This routine implements the send and urgent message functions. It * processes a message that is to be submitted to the designated * message queue. The message will either be processed as a * send message which it will be inserted at the rear of the queue * or it will be processed as an urgent message which will be inserted * at the front of the queue. * * Input parameters: * the_message_queue - message is submitted to this message queue * buffer - pointer to message buffer * size - size in bytes of message to send * id - id of message queue * api_message_queue_mp_support - api specific mp support callout * submit_type - send or urgent message * * Output parameters: * CORE_MESSAGE_QUEUE_SUCCESSFUL - if successful * error code - if unsuccessful */ void _CORE_message_queue_Submit( CORE_message_queue_Control *the_message_queue, void *buffer, unsigned32 size, Objects_Id id, CORE_message_queue_API_mp_support_callout api_message_queue_mp_support, CORE_message_queue_Submit_types submit_type, boolean wait, Watchdog_Interval timeout ) { ISR_Level level; CORE_message_queue_Buffer_control *the_message; Thread_Control *the_thread; Thread_Control *executing; _Thread_Executing->Wait.return_code = CORE_MESSAGE_QUEUE_STATUS_SUCCESSFUL; if ( size > the_message_queue->maximum_message_size ) { _Thread_Executing->Wait.return_code = CORE_MESSAGE_QUEUE_STATUS_INVALID_SIZE; return; } /* * Is there a thread currently waiting on this message queue? */ if ( the_message_queue->number_of_pending_messages == 0 ) { the_thread = _Thread_queue_Dequeue( &the_message_queue->Wait_queue ); if ( the_thread ) { _CORE_message_queue_Copy_buffer( buffer, the_thread->Wait.return_argument, size ); *(unsigned32 *)the_thread->Wait.return_argument_1 = size; the_thread->Wait.count = submit_type; #if defined(RTEMS_MULTIPROCESSING) if ( !_Objects_Is_local_id( the_thread->Object.id ) ) (*api_message_queue_mp_support) ( the_thread, id ); #endif return; } } /* * No one waiting on the message queue at this time, so attempt to * queue the message up for a future receive. */ if ( the_message_queue->number_of_pending_messages < the_message_queue->maximum_pending_messages ) { the_message = _CORE_message_queue_Allocate_message_buffer( the_message_queue ); /* * NOTE: If the system is consistent, this error should never occur. */ if ( !the_message ) { _Thread_Executing->Wait.return_code = CORE_MESSAGE_QUEUE_STATUS_UNSATISFIED; return; } _CORE_message_queue_Copy_buffer( buffer, the_message->Contents.buffer, size ); the_message->Contents.size = size; the_message->priority = submit_type; _CORE_message_queue_Insert_message( the_message_queue, the_message, submit_type ); return; } /* * No message buffers were available so we may need to return an * overflow error or block the sender until the message is placed * on the queue. */ if ( !wait ) { _Thread_Executing->Wait.return_code = CORE_MESSAGE_QUEUE_STATUS_TOO_MANY; return; } executing = _Thread_Executing; _ISR_Disable( level ); _Thread_queue_Enter_critical_section( &the_message_queue->Wait_queue ); executing->Wait.queue = &the_message_queue->Wait_queue; executing->Wait.id = id; executing->Wait.return_argument = (void *)buffer; executing->Wait.return_argument_1 = (void *)size; executing->Wait.count = submit_type; _ISR_Enable( level ); _Thread_queue_Enqueue( &the_message_queue->Wait_queue, timeout ); }
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