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typedef struct { volatile int counter; } atomic_t;
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atomic_read(atomic_t * v);
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atomic_set(atomic_t * v, int i);
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void atomic_add(int i, atomic_t *v);
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atomic_sub(int i, atomic_t *v);
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int atomic_sub_and_test(int i, atomic_t *v);
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void atomic_inc(atomic_t *v);
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void atomic_dec(atomic_t *v);
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int atomic_dec_and_test(atomic_t *v);
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int atomic_add_negative(int i, atomic_t *v);
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