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#include <stdint.h>
volatile uint64_t x;
int main(int argc, char *argv[])
{
uint64_t old, new = argc;
argv = argv;
do {
old = __sync_val_compare_and_swap(&x, 0, 0);
} while (!__sync_bool_compare_and_swap(&x, old, new));
return old == new;
}
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