summaryrefslogtreecommitdiffstats
path: root/tools/perf/config/feature-checks/test-sync-compare-and-swap.c
blob: c34d4ca4af56eb34e5d9b90aa2cabe1d4c844bac (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
#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;
}
OpenPOWER on IntegriCloud