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piThread.c 1.8 KiB

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  1. /*
  2. * piThread.c:
  3. * Provide a simplified interface to pthreads
  4. *
  5. * Copyright (c) 2012 Gordon Henderson
  6. ***********************************************************************
  7. * This file is part of wiringPi:
  8. * https://github.com/WiringPi/WiringPi/
  9. *
  10. * wiringPi is free software: you can redistribute it and/or modify
  11. * it under the terms of the GNU Lesser General Public License as
  12. * published by the Free Software Foundation, either version 3 of the
  13. * License, or (at your option) any later version.
  14. *
  15. * wiringPi is distributed in the hope that it will be useful,
  16. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  18. * GNU Lesser General Public License for more details.
  19. *
  20. * You should have received a copy of the GNU Lesser General Public
  21. * License along with wiringPi.
  22. * If not, see <http://www.gnu.org/licenses/>.
  23. ***********************************************************************
  24. */
  25. #include <pthread.h>
  26. #include "wiringPi.h"
  27. static pthread_mutex_t piMutexes [4] ;
  28. /*
  29. * piThreadCreate:
  30. * Create and start a thread
  31. *********************************************************************************
  32. */
  33. int piThreadCreate (void *(*fn)(void *))
  34. {
  35. pthread_t myThread ;
  36. return pthread_create (&myThread, NULL, fn, NULL) ;
  37. }
  38. /*
  39. * piLock: piUnlock:
  40. * Activate/Deactivate a mutex.
  41. * We're keeping things simple here and only tracking 4 mutexes which
  42. * is more than enough for our entry-level pthread programming
  43. *********************************************************************************
  44. */
  45. void piLock (int key)
  46. {
  47. pthread_mutex_lock (&piMutexes [key]) ;
  48. }
  49. void piUnlock (int key)
  50. {
  51. pthread_mutex_unlock (&piMutexes [key]) ;
  52. }