linux/tools/build/feature/test-sync-compare-and-swap.c

16 lines
287 B
C

// SPDX-License-Identifier: GPL-2.0
#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;
}