pthread_spin_lock.c 1.1 KB

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  1. /* Copyright (C) 2003 Free Software Foundation, Inc.
  2. This file is part of the GNU C Library.
  3. The GNU C Library is free software; you can redistribute it and/or
  4. modify it under the terms of the GNU Lesser General Public
  5. License as published by the Free Software Foundation; either
  6. version 2.1 of the License, or (at your option) any later version.
  7. The GNU C Library is distributed in the hope that it will be useful,
  8. but WITHOUT ANY WARRANTY; without even the implied warranty of
  9. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  10. Lesser General Public License for more details.
  11. You should have received a copy of the GNU Lesser General Public
  12. License along with the GNU C Library; if not, write to the Free
  13. Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  14. 02111-1307 USA. */
  15. #include "pthreadP.h"
  16. int
  17. pthread_spin_lock (lock)
  18. pthread_spinlock_t *lock;
  19. {
  20. unsigned int val;
  21. do
  22. __asm__ volatile ("tas.b @%1; movt %0"
  23. : "=&r" (val)
  24. : "r" (lock)
  25. : "memory");
  26. while (val == 0);
  27. return 0;
  28. }