Problem with messages

[Leon Pollak]

IMHO, you have defined message length parameter (in queue creation) as 1 byte, 
but try to send a pointer, which is 4 bytes length.

On Tuesday 20 March 2007, hwulf at et-inf.fho-emden.de wrote:
> Hi,
>
> I'm rather new to RTEMS and I wanted to try out the message queues.
> I'm checking the status codes with a hand-written print_status_code()
> function. Creating of the message queues is successful, but when
> trying to send a message from user_task_1 to user_task_2, RTEMS
> says "RTEMS_INVALID_SIZE".
>
> Does anybody have an idea?
>
> The example code is shown below.
>
> Thank you very much and kind regards,
> Hank
>
>
>
>
> /**************************************************************************
>**** *
>   * INIT
>   *
>   *
> ***************************************************************************
>*/ rtems_task Init(rtems_task_argument argument)
> {
> 	rtems_status_code status;
>
>
> 	puts("\n\n*** TASK COMMUNICATION TEST ***");
> 	/*
> 	 * Building necessary names
> 	 */
> 	Task_name[1] = rtems_build_name('T', 'S', 'K', '1');
> 	Task_name[2] = rtems_build_name('T', 'S', 'K', '2');
> 	Queue_name[1] = rtems_build_name('Q', 'U', 'E', '1');
> 	Queue_name[2] = rtems_build_name('Q', 'U', 'E', '2');
> //	Semaphore_name[1] = rtems_build_name('S', 'E', 'M', '1');
> //	Semaphore_name[2] = rtems_build_name('S', 'E', 'M', '2');
>
> 	/*
> 	 * Create the user tasks
> 	 */
> 	status = rtems_task_create(Task_name[1], 1, RTEMS_MINIMUM_STACK_SIZE * 2,
>    							 RTEMS_DEFAULT_MODES | RTEMS_PREEMPT | RTEMS_TIMESLICE,
>    							 RTEMS_DEFAULT_ATTRIBUTES, &Task_id[ 1 ]);
>    	print_status_code(status, "Creating Task 1");
>
> 	status = rtems_task_create(Task_name[2], 1, RTEMS_MINIMUM_STACK_SIZE * 2,
>    							 RTEMS_DEFAULT_MODES | RTEMS_PREEMPT | RTEMS_TIMESLICE,
>    							 RTEMS_DEFAULT_ATTRIBUTES, &Task_id[ 2 ]);
>    	print_status_code(status, "Creating Task 2");
>
> 	/*
> 	 * Create the message queues
> 	 */
> 	status = rtems_message_queue_create(Queue_name[1], 40, 1,
> 							RTEMS_LOCAL, &Queue_id[1]);
> 	print_status_code(status, "Creating Message Queue 1");
>
> 	status = rtems_message_queue_create(Queue_name[2], 1, 1,
> 							RTEMS_FIFO | RTEMS_LOCAL, &Queue_id[2]);
> 	print_status_code(status, "Creating Message Queue 2");
>
> 	/*
> 	 * Create the semaphores
> 	 */
> //	status = rtems_semaphore_create(Semaphore_name[1], 1,
> //							RTEMS_FIFO | RTEMS_BINARY_SEMAPHORE |
> //							RTEMS_NO_INHERIT_PRIORITY | RTEMS_NO_PRIORITY_CEILING |
> //							RTEMS_LOCAL, 2, &Semaphore_id[1]);
> //	print_status_code(status, "Creating Semaphore 1");
>
> //	status = rtems_semaphore_create(Semaphore_name[2], 1,
> //							RTEMS_FIFO | RTEMS_BINARY_SEMAPHORE |
> //							RTEMS_NO_INHERIT_PRIORITY | RTEMS_NO_PRIORITY_CEILING |
> //							RTEMS_LOCAL, 2, &Semaphore_id[2]);
> //	print_status_code(status, "Creating Semaphore 2");
>
> 	status = rtems_task_start( Task_id[ 1 ], user_task_1, 0 );
> //	rtems_task_wake_after( 100 );
> 	status = rtems_task_start( Task_id[ 2 ], user_task_2, 0 );
>
> //	rtems_task_wake_after( 5000 );
>
> 	status = rtems_task_delete( RTEMS_SELF );
> }
> #include <stdio.h>
>
> /**************************************************************************
>**** *
>   * USER_TASK1
>   *
>   *
> ***************************************************************************
>*/ rtems_task user_task_1(rtems_task_argument unused)
> {
> //	rtems_id          tid;
> //	rtems_unsigned32  task_index;
> 	rtems_status_code status;
> //	rtems_event_set task1_event;
> 	char buffer[40] = "Hello World!\n";
> 	rtems_unsigned32 buflen = 40;
>
> 	status = rtems_message_queue_send(Queue_id[1], (void*)buffer, buflen);
> 	print_status_code(status, "Message sent.");
> 	printf("Task 1: This message was sent to Task 2: %s\n", buffer);
> 	//rtems_message_queue_receive(Queue_id[1], (void*)&buffer, &buflen,
> RTEMS_WAIT, RTEMS_NO_TIMEOUT);
>
> 	rtems_task_wake_after(100);
>
>
> }
>
> /**************************************************************************
>**** *
>   * USER_TASK2
>   *
>   *
> ***************************************************************************
>*/ rtems_task user_task_2(rtems_task_argument unused)
> {
> 	rtems_id          tid;
> 	rtems_unsigned32  task_index;
> 	rtems_status_code status;
> 	rtems_event_set task2_event = 100;
> 	char buffer[40] = "Hello World back!\n";
> 	rtems_unsigned32 buflen = 40;
>
> 	//rtems_message_queue_send(Queue_id[1], (void*)&buffer, buflen);
> 	status = rtems_message_queue_receive(Queue_id[1], (void*)&buffer,
> &buflen, RTEMS_NO_WAIT, 10);
> 	print_status_code(status, "Message received.");
> 	//printf("Task 2: This message was received: %s\n", buffer);
> 	//rtems_task_wake_after(1);
> }
>
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-- 
Dr.Leon M.Pollak
    Director
PLR Information Systems Ltd.
Tel.:+972-98657670
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