From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Wed, 5 Aug 2015 17:04:01 -0300 Subject: Initial import --- tools/build/feature/test-sync-compare-and-swap.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) create mode 100644 tools/build/feature/test-sync-compare-and-swap.c (limited to 'tools/build/feature/test-sync-compare-and-swap.c') diff --git a/tools/build/feature/test-sync-compare-and-swap.c b/tools/build/feature/test-sync-compare-and-swap.c new file mode 100644 index 000000000..c34d4ca4a --- /dev/null +++ b/tools/build/feature/test-sync-compare-and-swap.c @@ -0,0 +1,14 @@ +#include + +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; +} -- cgit v1.2.3-54-g00ecf