importsysimport_overlappeddeftotal():returnsys.gettotalrefcount()ifnothasattr(sys,"gettotalrefcount"):raiseSystemExit("need a debug build (Py_DEBUG) for gettotalrefcount")before=total()N=20000STEP=1000foriinrange(1,N+1):ov=_overlapped.Overlapped()buf=memoryview(bytearray(4096))try:ov.WSASendTo(0x1234,buf,0, ("127.0.0.1",1))exceptOSError:passifi%STEP==0:now=total()print(f"{i:6d}: totalrefcount delta ={now-before:+d}")after=total()print(f"done: N={N}, totalrefcount delta ={after-before:+d}")

d:\MyCode\cpython\PCbuild\amd64>python_d.exe py_overlapped_leak.py  1000: totalrefcount delta = +4007  2000: totalrefcount delta = +8009  3000: totalrefcount delta = +11906  4000: totalrefcount delta = +15906  5000: totalrefcount delta = +19906...... 19000: totalrefcount delta = +75906 20000: totalrefcount delta = +79906done: N=20000, totalrefcount delta = +79905