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