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/*
* Copyright (c) 2014 Daniel Ramirez. (javamonn@gmail.com)
*
* This file's license is 2-clause BSD as in this distribution's LICENSE file.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <timesys.h>
#include <rtems/btimer.h>
const char rtems_test_name[] = "RHMLATENCY";
#define MESSAGE_SIZE (sizeof(long) * 4)
#define BENCHMARKS 50000
rtems_task Init( rtems_task_argument ignored );
rtems_task Task01( rtems_task_argument ignored );
rtems_task Task02( rtems_task_argument ignored );
uint32_t telapsed;
uint32_t tloop_overhead;
uint32_t treceive_overhead;
uint32_t count;
rtems_id Task_id[2];
rtems_name Task_name[2];
rtems_id Queue_id;
long Buffer[4];
void Init(
rtems_task_argument argument
)
{
rtems_status_code status;
Print_Warning();
TEST_BEGIN();
status = rtems_message_queue_create(
rtems_build_name( 'M', 'Q', '1', ' ' ),
1,
MESSAGE_SIZE,
RTEMS_DEFAULT_ATTRIBUTES,
&Queue_id
);
directive_failed( status, "rtems_message_queue_create" );
Task_name[0] = rtems_build_name( 'T','A','0','1' );
status = rtems_task_create(
Task_name[0],
30, /* TA01 is low priority task */
RTEMS_MINIMUM_STACK_SIZE,
RTEMS_DEFAULT_MODES,
RTEMS_DEFAULT_ATTRIBUTES,
&Task_id[0]
);
directive_failed( status, "rtems_task_create of TA01");
Task_name[1] = rtems_build_name( 'T','A','0','2' );
status = rtems_task_create(
Task_name[1],
28, /* High priority task */
RTEMS_MINIMUM_STACK_SIZE,
RTEMS_DEFAULT_MODES,
RTEMS_DEFAULT_ATTRIBUTES,
&Task_id[1]
);
directive_failed( status, "rtems_task_create of TA01" );
benchmark_timer_initialize();
for ( count = 0; count < BENCHMARKS - 1; count++ ) {
/* message send/recieve */
}
tloop_overhead = benchmark_timer_read();
status = rtems_task_start( Task_id[0], Task01, 0 );
directive_failed( status, "rtems_task_start of TA01" );
status = rtems_task_delete( RTEMS_SELF );
directive_failed( status, "rtems_task_delete of RTEMS_SELF" );
}
rtems_task Task01( rtems_task_argument ignored )
{
rtems_status_code status;
/* Put a message in the queue so recieve overhead can be found. */
(void) rtems_message_queue_send( Queue_id, Buffer, MESSAGE_SIZE );
/* Start up second task, get preempted */
status = rtems_task_start( Task_id[1], Task02, 0 );
directive_failed( status, "rtems_task_start" );
for ( ; count < BENCHMARKS; count++ ) {
(void) rtems_message_queue_send( Queue_id, Buffer, MESSAGE_SIZE );
}
/* Should never reach here */
rtems_test_assert( false );
}
rtems_task Task02( rtems_task_argument ignored )
{
size_t size;
/* find recieve overhead - no preempt or task switch */
benchmark_timer_initialize();
(void) rtems_message_queue_receive(
Queue_id,
(long (*)[4]) Buffer,
&size,
RTEMS_DEFAULT_OPTIONS,
RTEMS_NO_TIMEOUT
);
treceive_overhead = benchmark_timer_read();
/* Benchmark code */
benchmark_timer_initialize();
for ( count = 0; count < BENCHMARKS - 1; count++ ) {
(void) rtems_message_queue_receive(
Queue_id,
(long (*)[4]) Buffer,
&size,
RTEMS_DEFAULT_OPTIONS,
RTEMS_NO_TIMEOUT
);
}
telapsed = benchmark_timer_read();
put_time(
"Rhealstone: Intertask Message Latency",
telapsed, /* Total time of all benchmarks */
BENCHMARKS - 1, /* Total benchmarks */
tloop_overhead, /* Overhead of loops */
treceive_overhead /* Overhead of recieve call and task switch */
);
TEST_END();
rtems_test_exit( 0 );
}
/* configuration information */
#define CONFIGURE_APPLICATION_NEEDS_CONSOLE_DRIVER
#define CONFIGURE_APPLICATION_NEEDS_TIMER_DRIVER
#define CONFIGURE_MAXIMUM_TASKS 3
#define CONFIGURE_MAXIMUM_MESSAGE_QUEUES 1
#define CONFIGURE_MESSAGE_BUFFER_MEMORY \
CONFIGURE_MESSAGE_BUFFERS_FOR_QUEUE(1, MESSAGE_SIZE)
#define CONFIGURE_TICKS_PER_TIMESLICE 0
#define CONFIGURE_RTEMS_INIT_TASKS_TABLE
#define CONFIGURE_INIT
#include <rtems/confdefs.h>
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