git: drawterm

ref: 19f9f65cede04b19db1c5bc861119a613f8b91b8
dir: /posix-port/tas.c/

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#include "u.h"
#include "libc.h"

int
tas(int *x)
{
	return __atomic_test_and_set(x, __ATOMIC_ACQ_REL);
}