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/platform/cooja/sys/cooja_mt.c

https://github.com/zxombie/contiki-arduino
C | 107 lines | 49 code | 5 blank | 53 comment | 3 complexity | 7b4e795830e368bd8e697222334ca049 MD5 | raw file
  1. /*
  2. * Copyright (c) 2004, Swedish Institute of Computer Science.
  3. * All rights reserved.
  4. *
  5. * Redistribution and use in source and binary forms, with or without
  6. * modification, are permitted provided that the following conditions
  7. * are met:
  8. * 1. Redistributions of source code must retain the above copyright
  9. * notice, this list of conditions and the following disclaimer.
  10. * 2. Redistributions in binary form must reproduce the above copyright
  11. * notice, this list of conditions and the following disclaimer in the
  12. * documentation and/or other materials provided with the distribution.
  13. * 3. Neither the name of the Institute nor the names of its contributors
  14. * may be used to endorse or promote products derived from this software
  15. * without specific prior written permission.
  16. *
  17. * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  18. * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19. * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20. * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  21. * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22. * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23. * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24. * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25. * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26. * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27. * SUCH DAMAGE.
  28. *
  29. * This file is part of the Contiki operating system.
  30. *
  31. * Author: Adam Dunkels <adam@sics.se>
  32. *
  33. * $Id: cooja_mt.c,v 1.1 2006/09/29 14:32:38 fros4943 Exp $
  34. */
  35. /*
  36. * This file is ripped from mt.c of the Contiki Multi-threading library.
  37. * Fredrik Osterlind <fros@sics.se>
  38. */
  39. #include "contiki.h"
  40. #include "sys/cooja_mt.h"
  41. #include "sys/cc.h"
  42. #define MT_STATE_READY 1
  43. #define MT_STATE_RUNNING 2
  44. #define MT_STATE_WAITING 3
  45. #define MT_STATE_PEEK 4
  46. #define MT_STATE_EXITED 5
  47. static struct cooja_mt_thread *current;
  48. /*--------------------------------------------------------------------------*/
  49. void
  50. cooja_mt_init(void)
  51. {
  52. cooja_mtarch_init();
  53. }
  54. /*--------------------------------------------------------------------------*/
  55. void
  56. cooja_mt_remove(void)
  57. {
  58. cooja_mtarch_remove();
  59. }
  60. /*--------------------------------------------------------------------------*/
  61. void
  62. cooja_mt_start(struct cooja_mt_thread *thread, void (* function)(void *), void *data)
  63. {
  64. /* Call the architecture dependant function to set up the processor
  65. stack with the correct parameters. */
  66. cooja_mtarch_start(&thread->thread, function, data);
  67. thread->state = MT_STATE_READY;
  68. }
  69. /*--------------------------------------------------------------------------*/
  70. void
  71. cooja_mt_exec(struct cooja_mt_thread *thread)
  72. {
  73. if(thread->state == MT_STATE_READY ||
  74. thread->state == MT_STATE_PEEK) {
  75. thread->state = MT_STATE_RUNNING;
  76. current = thread;
  77. /* Switch context to the thread. The function call will not return
  78. until the the thread has yielded, or is preempted. */
  79. /*printf("swtis\n");*/
  80. cooja_mtarch_exec(&thread->thread);
  81. }
  82. }
  83. /*--------------------------------------------------------------------------*/
  84. void
  85. cooja_mt_exit(void)
  86. {
  87. current->state = MT_STATE_EXITED;
  88. current = NULL;
  89. cooja_mtarch_yield();
  90. }
  91. /*--------------------------------------------------------------------------*/
  92. void
  93. cooja_mt_yield(void)
  94. {
  95. current->state = MT_STATE_READY;
  96. current = NULL;
  97. /* This function is called from the running thread, and we call the
  98. switch function in order to switch the thread to the main Contiki
  99. program instead. For us, the switch function will not return
  100. until the next time we are scheduled to run. */
  101. cooja_mtarch_yield();
  102. }