code: drawterm

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missed tas.c opportunity

--- /dev/null

+++ b/posix-port/tas.c

@@ -1,0 +1,8 @@

+#include "u.h"

+#include "libc.h"

+

+int

+tas(int *x)

+{

+	return __atomic_test_and_set(x, __ATOMIC_ACQ_REL);

+}