/*
* Original version submitted as part of PR1212
*
* This example shows a possible blocking of timeslicing if task mode is
* changed to timeslicing in the middle of its executing.
*
* The expected output is:
*
* Task #0's turn. Now setting turn to 1
* Task #1's turn. Now setting turn to 0
* Task #0's turn. Now setting turn to 1
* Task #1's turn. Now setting turn to 0
* Task #0's turn. Now setting turn to 1
* Task #1's turn. Now setting turn to 0
* Task #0's turn. Now setting turn to 1
* ...
*
* The actural output is:
*
* Task #0's turn. Now setting turn to 1
*
* Task #1 can not be dispatched also both tasks have timeslice enabled.
*
* Setting TASK_A/B_INITMODE to RTEMS_DEFAULT_MODES | RTEMS_TIMESLICE
* will produce the expected output.
*
* $Id$
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <tmacros.h>
#include <rtems.h>
#include <stdio.h>
#include <stdlib.h>
rtems_task Init(rtems_task_argument ignored);
rtems_task TaskAB_entry(rtems_task_argument me);
/*** Task priorities ***/
#define TASK_A_PRIORITY 10
#define TASK_B_PRIORITY 10
/*** Task names ***/
#define TASK_A_NAME 1
#define TASK_B_NAME 2
/*** Task atributes ***/
#define TASK_A_INITMODE RTEMS_DEFAULT_MODES
#define TASK_B_INITMODE RTEMS_DEFAULT_MODES
/*** Task generic parameters ***/
#define TASK_A_STACKSIZE RTEMS_MINIMUM_STACK_SIZE
#define TASK_A_MODEATTR RTEMS_DEFAULT_ATTRIBUTES
#define TASK_B_STACKSIZE RTEMS_MINIMUM_STACK_SIZE
#define TASK_B_MODEATTR RTEMS_DEFAULT_ATTRIBUTES
volatile uint32_t turn;
rtems_id TaskA_id, TaskB_id;
#define TEST_FAILED(_status, _msg) \
do { \
printf("Test failed, status code: %d, msg: %s\n", _status, _msg); \
exit(1); \
} while(0)
/* TASK A/B */
rtems_task TaskAB_entry(rtems_task_argument me)
{
static rtems_mode previous_mode_set;
rtems_status_code status;
uint32_t iterations = 0;
status = rtems_task_mode(RTEMS_PREEMPT | RTEMS_TIMESLICE,
RTEMS_PREEMPT_MASK | RTEMS_TIMESLICE_MASK,
&previous_mode_set);
if (status != RTEMS_SUCCESSFUL)
TEST_FAILED(status, "Unable to change task mode.");
while(1) {
if (turn == me) {
printf("Task #%" PRIdrtems_task_argument "'s turn. Now setting turn to %" PRIdrtems_task_argument "\n", me, 1 - me);
turn = 1 - me;
if ( ++iterations == 10 ) {
puts( "*** END OF SP44 TEST ***" );
exit( 0 );
}
}
}
}
rtems_task Init(rtems_task_argument ignored)
{
static rtems_status_code status;
puts( "\n\n*** SP44 TEST ***" );
/* Create Task A */
status = rtems_task_create(TASK_A_NAME, TASK_A_PRIORITY, TASK_A_STACKSIZE,
TASK_A_INITMODE, TASK_A_MODEATTR, &TaskA_id);
if (status != RTEMS_SUCCESSFUL)
TEST_FAILED(status,"rtems_task_create failed.\n");
/* Start Task A */
status = rtems_task_start(TaskA_id, TaskAB_entry, 0);
if (status != RTEMS_SUCCESSFUL)
TEST_FAILED(status,"rtems_task_start failed.\n");
/* Create Task B */
status = rtems_task_create(TASK_B_NAME, TASK_B_PRIORITY, TASK_B_STACKSIZE,
TASK_B_INITMODE, TASK_B_MODEATTR, &TaskB_id);
if (status != RTEMS_SUCCESSFUL)
TEST_FAILED(status,"rtems_task_create failed.\n");
/* Start Task B */
status = rtems_task_start(TaskB_id, TaskAB_entry, 1);
if (status != RTEMS_SUCCESSFUL)
TEST_FAILED(status,"rtems_task_start failed.\n");
/* Suspend itself */
status = rtems_task_suspend(RTEMS_SELF);
if (status != RTEMS_SUCCESSFUL)
TEST_FAILED(status,"rtems_task_suspend failed.\n");
/* This task is not suposed to be executed anymore */
printf("\nNOT SUPOSED TO RETURN HERE...\n");
exit(1);
}
/* configuration information */
#define CONFIGURE_APPLICATION_NEEDS_CLOCK_DRIVER
#define CONFIGURE_APPLICATION_NEEDS_CONSOLE_DRIVER
#define CONFIGURE_MICROSECONDS_PER_TICK 1000
#define CONFIGURE_TICKS_PER_TIMESLICE 10
#define CONFIGURE_MAXIMUM_TASKS 3
#define CONFIGURE_RTEMS_INIT_TASKS_TABLE
#define CONFIGURE_INIT
#include <rtems/confdefs.h>
