1ATOMIC_ADD_UNLESS(9)             Driver Basics            ATOMIC_ADD_UNLESS(9)
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NAME

6       atomic_add_unless - add unless the number is already a given value
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SYNOPSIS

9       int atomic_add_unless(atomic_t * v, int a, int u);
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ARGUMENTS

12       v
13           pointer of type atomic_t
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15       a
16           the amount to add to v...
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18       u
19           ...unless v is equal to u.
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DESCRIPTION

22       Atomically adds a to v, so long as v was not already u. Returns
23       non-zero if v was not u, and zero otherwise.
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26Kernel Hackers Manual 2.6.       November 2011            ATOMIC_ADD_UNLESS(9)
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