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uclibc-ng
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libpthread
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nptl
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sysdeps
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arc
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pthread_spin_trylock.S

pthread_spin_trylock.S 579 B
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  1. /*
    2. 

  2.  * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
    3. 

  3.  *
    4. 

  4.  * Licensed under LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
    5. 

  5.  */
    6. 

  6. 

  7. #include <sysdep.h>
    8. 

  8. 

  9. #define _ERRNO_H 1
    10. 

  10. #include <bits/errno.h>
    11. 

  11. 

  12. ; int pthread_spin_trylock(pthread_spinlock_t *lock)
    13. 

  13. ; Return EBUSY is already locked, 0 if not
    14. 

  14. 

  15. ENTRY(pthread_spin_trylock)
    16. 

  16. 	mov_s	r1, 1
    17. 

  17. 	ex	r1, [r0]
    18. 

  18. 	tst	r1, r1
    19. 

  19. 	mov.z	r0, 0
    20. 

  20. 	j.d	[blink]
    21. 

  21. 	mov.nz	r0, EBUSY
    22. 

  22. 

  23. ;	slightly faster, but difficult to follow
    24. 

  24. ;	mov_s	r1, r0
    25. 

  25. ;	mov_s	r0, 1
    26. 

  26. ;	ex	r0, [r1]
    27. 

  27. ;	tst	r0, r0
    28. 

  28. ;	j.d	[blink]
    29. 

  29. ;	mov.nz	r0, EBUSY
    30. 

  30. 

  31. END(pthread_spin_trylock)
    32.