/include/asm-generic/atomic64.h

https://bitbucket.org/thekraven/iscream_thunderc-2.6.35 · C++ Header · 42 lines · 26 code · 5 blank · 11 comment · 3 complexity · dbd702e39ae05b9baa06cedee4e4e589 MD5 · raw file 

    

  1. /*
    2. 

  2.  * Generic implementation of 64-bit atomics using spinlocks,
    3. 

  3.  * useful on processors that don't have 64-bit atomic instructions.
    4. 

  4.  *
    5. 

  5.  * Copyright Š 2009 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
    6. 

  6.  *
    7. 

  7.  * This program is free software; you can redistribute it and/or
    8. 

  8.  * modify it under the terms of the GNU General Public License
    9. 

  9.  * as published by the Free Software Foundation; either version
    10. 

  10.  * 2 of the License, or (at your option) any later version.
    11. 

  11.  */
    12. 

  12. #ifndef _ASM_GENERIC_ATOMIC64_H
    13. 

  13. #define _ASM_GENERIC_ATOMIC64_H
    14. 

  14. 

  15. typedef struct {
    16. 

  16. 	long long counter;
    17. 

  17. } atomic64_t;
    18. 

  18. 

  19. #define ATOMIC64_INIT(i)	{ (i) }
    20. 

  20. 

  21. extern long long atomic64_read(const atomic64_t *v);
    22. 

  22. extern void	 atomic64_set(atomic64_t *v, long long i);
    23. 

  23. extern void	 atomic64_add(long long a, atomic64_t *v);
    24. 

  24. extern long long atomic64_add_return(long long a, atomic64_t *v);
    25. 

  25. extern void	 atomic64_sub(long long a, atomic64_t *v);
    26. 

  26. extern long long atomic64_sub_return(long long a, atomic64_t *v);
    27. 

  27. extern long long atomic64_dec_if_positive(atomic64_t *v);
    28. 

  28. extern long long atomic64_cmpxchg(atomic64_t *v, long long o, long long n);
    29. 

  29. extern long long atomic64_xchg(atomic64_t *v, long long new);
    30. 

  30. extern int	 atomic64_add_unless(atomic64_t *v, long long a, long long u);
    31. 

  31. 

  32. #define atomic64_add_negative(a, v)	(atomic64_add_return((a), (v)) < 0)
    33. 

  33. #define atomic64_inc(v)			atomic64_add(1LL, (v))
    34. 

  34. #define atomic64_inc_return(v)		atomic64_add_return(1LL, (v))
    35. 

  35. #define atomic64_inc_and_test(v) 	(atomic64_inc_return(v) == 0)
    36. 

  36. #define atomic64_sub_and_test(a, v)	(atomic64_sub_return((a), (v)) == 0)
    37. 

  37. #define atomic64_dec(v)			atomic64_sub(1LL, (v))
    38. 

  38. #define atomic64_dec_return(v)		atomic64_sub_return(1LL, (v))
    39. 

  39. #define atomic64_dec_and_test(v)	(atomic64_dec_return((v)) == 0)
    40. 

  40. #define atomic64_inc_not_zero(v) 	atomic64_add_unless((v), 1LL, 0LL)
    41. 

  41. 

  42. #endif  /*  _ASM_GENERIC_ATOMIC64_H  */
    43.