pthread_spin_lock.c 1.3 KB

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  1. /* Copyright (C) 2003 Free Software Foundation, Inc.
  2. This file is part of the GNU C Library.
  3. Contributed by Jakub Jelinek <jakub@redhat.com>, 2003.
  4. The GNU C Library is free software; you can redistribute it and/or
  5. modify it under the terms of the GNU Lesser General Public
  6. License as published by the Free Software Foundation; either
  7. version 2.1 of the License, or (at your option) any later version.
  8. The GNU C Library is distributed in the hope that it will be useful,
  9. but WITHOUT ANY WARRANTY; without even the implied warranty of
  10. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  11. Lesser General Public License for more details.
  12. You should have received a copy of the GNU Lesser General Public
  13. License along with the GNU C Library; if not, write to the Free
  14. Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  15. 02111-1307 USA. */
  16. #include "pthreadP.h"
  17. int
  18. pthread_spin_lock (pthread_spinlock_t *lock)
  19. {
  20. __asm__ __volatile
  21. ("1: ldstub [%0], %%g5\n"
  22. " brnz,pn %%g5, 2f\n"
  23. " membar #StoreLoad | #StoreStore\n"
  24. ".subsection 2\n"
  25. "2: ldub [%0], %%g5\n"
  26. " brnz,pt %%g5, 2b\n"
  27. " membar #LoadLoad\n"
  28. " b,a,pt %%xcc, 1b\n"
  29. ".previous"
  30. : /* no outputs */
  31. : "r" (lock)
  32. : "g5", "memory");
  33. return 0;
  34. }