From 76cb841cb886eef6b3bee341a2266c76578724ad Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Mon, 6 May 2024 03:02:30 +0200 Subject: Adding upstream version 4.19.249. Signed-off-by: Daniel Baumann --- tools/build/feature/test-sync-compare-and-swap.c | 15 +++++++++++++++ 1 file changed, 15 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..1e38d1930 --- /dev/null +++ b/tools/build/feature/test-sync-compare-and-swap.c @@ -0,0 +1,15 @@ +// SPDX-License-Identifier: GPL-2.0 +#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