add prototypes for stdatomic

1 files changed, 13 insertions, 0 deletions

diff --git a/src/stdatomic/atomic_compare_exchange_strong.c b/src/stdatomic/atomic_compare_exchange_strong.c
new file mode 100644
index 00000000..43877395
--- /dev/null
+++ b/src/stdatomic/atomic_compare_exchange_strong.c
@@ -0,0 +1,13 @@
+#include <stdatomic.h>
+#include <stdbool.h>
+
+_Bool atomic_compare_exchange_strong(volatile __TYPE *object, __BASE *expected, __BASE desired)
+{
+	if (memcmp(object, expected, sizeof(*object)) == 0) {
+		memcpy(object, &desired, sizeof(*object));
+		return true;
+	}
+
+	memcpy(expected, object, sizeof(*object));
+	return false;
+}