Hi,
I'm trying to implement a http server and I need to bind the underlying
socket to a specific VRF instance so that the server only listens on that
VRF instance. When some specific event happens, the program needs to
shutdown the http server. I'm using syscall.SetsockoptString() and option
"SO_BINDTODEVICE".
This is what I observe:
1.
if there is no SetsockoptString() to bind the underlying socket fd call,
the http server close call would succeed.
2.
if there is a SetsockoptString() to bind the underlying socket fd call,
then the http server close won't complete. In fact, it stuck in close() and
won't return.
Seems in the path of close(), decref() does call fd.destroy(), and later on
the program stuck in
func poll_runtime_Semacquire(addr *uint32) {
semacquire1(addr, false, semaBlockProfile, 0, waitReasonSemacquire)
>>>>>>>>>>>>>> stuck here}
comparing #1 and #2, the state number for mu is different, so that
fd.fdmu.decref() returns false and fd.destroy not getting called.
if fd.fdmu.decref() {return fd.destroy()}
I have my program attached to this email.
The same goes for http server Shutdown(context) call. My question, does
golang net/http packet support this scenario, shutdown() or close a http
server where the server has some explicit underlying socket fd binding? If
so, what code change should I make?
Thank you very much.
Bing
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http_server_close.go
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