sptests/sp44/init.c

0001 /*
0002  *  Copyright (C) 2008 Xudong Guan <xudong.guan@criticalsoftware.com>
0003  *
0004  *  Permission to use, copy, modify, and/or distribute this software
0005  *  for any purpose with or without fee is hereby granted.
0006  *
0007  *  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
0008  *  WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
0009  *  WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR
0010  *  BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES
0011  *  OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
0012  *  WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
0013  *  ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
0014  */
0015
0016 /*
0017  *  Original version submitted as part of PR1212
0018  *
0019  *  This example shows a possible blocking of timeslicing if task mode is
0020  *  changed to timeslicing in the middle of its executing.
0021  */
0022
0023 #ifdef HAVE_CONFIG_H
0024 #include "config.h"
0025 #endif
0026
0027 #include <tmacros.h>
0028 #include <rtems.h>
0029 #include <stdio.h>
0030 #include <stdlib.h>
0031
0032 const char rtems_test_name[] = "SP 44";
0033
0034 rtems_task Init(rtems_task_argument ignored);
0035 rtems_task TaskAB_entry(rtems_task_argument me);
0036
0037 /*** Task priorities ***/
0038 #define TASK_A_PRIORITY   10
0039 #define TASK_B_PRIORITY   10
0040
0041 /*** Task names ***/
0042 #define TASK_A_NAME     1
0043 #define TASK_B_NAME     2
0044
0045 /*** Task atributes ***/
0046 #define TASK_A_INITMODE    RTEMS_DEFAULT_MODES
0047 #define TASK_B_INITMODE    RTEMS_DEFAULT_MODES
0048
0049 /*** Task generic parameters ***/
0050 #define TASK_A_STACKSIZE   RTEMS_MINIMUM_STACK_SIZE
0051 #define TASK_A_MODEATTR    RTEMS_DEFAULT_ATTRIBUTES
0052 #define TASK_B_STACKSIZE   RTEMS_MINIMUM_STACK_SIZE
0053 #define TASK_B_MODEATTR    RTEMS_DEFAULT_ATTRIBUTES
0054
0055 volatile uint32_t turn;
0056 rtems_id TaskA_id, TaskB_id;
0057
0058 /* TASK A/B */
0059 rtems_task TaskAB_entry(rtems_task_argument me)
0060 {
0061   static rtems_mode previous_mode_set;
0062   rtems_status_code status;
0063   uint32_t iterations = 0;
0064
0065   status = rtems_task_mode(
0066     RTEMS_PREEMPT | RTEMS_TIMESLICE,
0067     RTEMS_PREEMPT_MASK | RTEMS_TIMESLICE_MASK,
0068     &previous_mode_set
0069   );
0070   directive_failed(status, "Unable to change task mode.");
0071
0072   while(1) {
0073     if (turn == me) {
0074       printf(
0075         "Task #%" PRIdrtems_task_argument "'s turn. Now setting turn to %"
0076           PRIdrtems_task_argument "\n",
0077           me,
0078           1 - me
0079       );
0080
0081       if ( ++iterations == 10 ) {
0082         TEST_END();
0083         exit( 0 );
0084       }
0085
0086       turn = 1 - me;
0087     }
0088   }
0089 }
0090
0091 rtems_task Init(rtems_task_argument ignored)
0092 {
0093   static rtems_status_code status;
0094
0095   TEST_BEGIN();
0096
0097   /* Create Task A */
0098   status = rtems_task_create(
0099     TASK_A_NAME,
0100     TASK_A_PRIORITY,
0101     TASK_A_STACKSIZE,
0102     TASK_A_INITMODE,
0103     TASK_A_MODEATTR,
0104     &TaskA_id
0105   );
0106   directive_failed(status,"rtems_task_create");
0107
0108   /* Start Task A */
0109   status = rtems_task_start(TaskA_id, TaskAB_entry, 0);
0110   directive_failed(status,"rtems_task_start");
0111
0112   /* Create Task B */
0113   status = rtems_task_create(
0114     TASK_B_NAME,
0115     TASK_B_PRIORITY,
0116     TASK_B_STACKSIZE,
0117     TASK_B_INITMODE,
0118     TASK_B_MODEATTR,
0119     &TaskB_id
0120   );
0121   directive_failed( status, "rtems_task_create" );
0122
0123   /* Start Task B */
0124   status = rtems_task_start(TaskB_id, TaskAB_entry, 1);
0125   directive_failed( status, "rtems_task_start" );
0126
0127   /* Suspend itself */
0128   status = rtems_task_suspend(RTEMS_SELF);
0129   directive_failed( status, "rtems_task_suspend" );
0130
0131   /* This task is not suposed to be executed anymore */
0132   printf("\nNOT SUPOSED TO RETURN HERE...\n");
0133   rtems_test_exit(1);
0134 }
0135
0136 /* configuration information */
0137
0138 #define CONFIGURE_APPLICATION_NEEDS_CLOCK_DRIVER
0139 #define CONFIGURE_APPLICATION_NEEDS_SIMPLE_CONSOLE_DRIVER
0140
0141 #define CONFIGURE_MICROSECONDS_PER_TICK 1000
0142 #define CONFIGURE_TICKS_PER_TIMESLICE   10
0143 #define CONFIGURE_MAXIMUM_TASKS         3
0144
0145 #define CONFIGURE_INITIAL_EXTENSIONS RTEMS_TEST_INITIAL_EXTENSION
0146
0147 #define CONFIGURE_RTEMS_INIT_TASKS_TABLE
0148
0149 #define CONFIGURE_INIT
0150
0151 #include <rtems/confdefs.h>