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uint32_t

atomic_cas(volatile uint32_t *mem, uint32_t with, uint32_t cmp)

{

uint32_t prev;

__asm__ volatile ("lock; cmpxchgl %1, %2"

: "=a" (prev)

: "r" (with), "m" (*(mem)), "0"(cmp)

: "memory", "cc");

return prev;

}

#define trylock(lock) ((lock) == 1 && atomic_cas(&lock, 0, 1))

#define unlock(lock) (lock) = 1

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