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

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <stdint.h>
   3
   4 volatile uint64_t x;
   5
   6 int main(int argc, char *argv[])
   7 {
   8         uint64_t old, new = argc;
   9
  10         argv = argv;
  11         do {
  12                 old = __sync_val_compare_and_swap(&x, 0, 0);
  13         } while (!__sync_bool_compare_and_swap(&x, old, new));
  14         return old == new;
  15 }