pt-machine.h 2.0 KB

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  1. /* Machine-dependent pthreads configuration and inline functions.
  2. CRIS version.
  3. Copyright (C) 2001, 2002 Free Software Foundation, Inc.
  4. This file is part of the GNU C Library.
  5. The GNU C Library is free software; you can redistribute it and/or
  6. modify it under the terms of the GNU Lesser General Public License as
  7. published by the Free Software Foundation; either version 2.1 of the
  8. License, or (at your option) any later version.
  9. The GNU C Library is distributed in the hope that it will be useful,
  10. but WITHOUT ANY WARRANTY; without even the implied warranty of
  11. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  12. Lesser General Public License for more details.
  13. You should have received a copy of the GNU Lesser General Public
  14. License along with the GNU C Library; see the file COPYING.LIB. If not,
  15. write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  16. Boston, MA 02111-1307, USA. */
  17. #ifndef _PT_MACHINE_H
  18. #define _PT_MACHINE_H 1
  19. #ifndef PT_EI
  20. # define PT_EI extern inline
  21. #endif
  22. extern long int testandset (int *spinlock);
  23. extern int __compare_and_swap (long int *p, long int oldval, long int newval);
  24. PT_EI long int
  25. testandset (int *spinlock)
  26. {
  27. register unsigned long int ret;
  28. /* Note the use of a dummy output of *spinlock to expose the write. The
  29. memory barrier is to stop *other* writes being moved past this code. */
  30. __asm__ __volatile__("clearf\n"
  31. "0:\n\t"
  32. "movu.b [%2],%0\n\t"
  33. "ax\n\t"
  34. "move.b %3,[%2]\n\t"
  35. "bwf 0b\n\t"
  36. "clearf"
  37. : "=&r" (ret), "=m" (*spinlock)
  38. : "r" (spinlock), "r" ((int) 1)
  39. : "memory");
  40. return ret;
  41. }
  42. /* Get some notion of the current stack. Need not be exactly the top
  43. of the stack, just something somewhere in the current frame.
  44. I don't trust register variables, so let's do this the safe way. */
  45. #define CURRENT_STACK_FRAME \
  46. ({ char *sp; __asm__ ("move.d $sp,%0" : "=rm" (sp)); sp; })
  47. #endif /* pt-machine.h */