rwlock.h 1.6 KB

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  1. /* StarPU --- Runtime system for heterogeneous multicore architectures.
  2. *
  3. * Copyright (C) 2008-2011,2014 Université de Bordeaux
  4. * Copyright (C) 2010,2011,2015,2017 CNRS
  5. *
  6. * StarPU is free software; you can redistribute it and/or modify
  7. * it under the terms of the GNU Lesser General Public License as published by
  8. * the Free Software Foundation; either version 2.1 of the License, or (at
  9. * your option) any later version.
  10. *
  11. * StarPU is distributed in the hope that it will be useful, but
  12. * WITHOUT ANY WARRANTY; without even the implied warranty of
  13. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  14. *
  15. * See the GNU Lesser General Public License in COPYING.LGPL for more details.
  16. */
  17. #ifndef __RWLOCKS_H__
  18. #define __RWLOCKS_H__
  19. #include <stdint.h>
  20. #include <starpu.h>
  21. /* Dummy implementation of a RW-lock using a spinlock. */
  22. struct _starpu_rw_lock
  23. {
  24. uint32_t busy;
  25. uint8_t writer;
  26. uint16_t readercnt;
  27. };
  28. /* Initialize the RW-lock */
  29. void _starpu_init_rw_lock(struct _starpu_rw_lock *lock);
  30. /* Grab the RW-lock in a write mode */
  31. void _starpu_take_rw_lock_write(struct _starpu_rw_lock *lock);
  32. /* Grab the RW-lock in a read mode */
  33. void _starpu_take_rw_lock_read(struct _starpu_rw_lock *lock);
  34. /* Try to grab the RW-lock in a write mode. Returns 0 in case of success, -1
  35. * otherwise. */
  36. int _starpu_take_rw_lock_write_try(struct _starpu_rw_lock *lock);
  37. /* Try to grab the RW-lock in a read mode. Returns 0 in case of success, -1
  38. * otherwise. */
  39. int _starpu_take_rw_lock_read_try(struct _starpu_rw_lock *lock);
  40. /* Unlock the RW-lock. */
  41. void _starpu_release_rw_lock(struct _starpu_rw_lock *lock);
  42. #endif