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Commit29992a6

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Revert "graceful shutdown" changes for Windows.
This reverts commits6051857 anded52c37 in HEAD (they were alreadyreverted in the back branches). Further testing has shown that whilethose changes do fix some things, they also break others; in particular,it looks like walreceivers fail to detect walsender-initiated connectionclose reliably if the walsender shuts down this way. A proper fix forthis seems possible but won't be done in time for v15.Discussion:https://postgr.es/m/CA+hUKG+OeoETZQ=Qw5Ub5h3tmwQhBmDA=nuNO3KG=zWfUypFAw@mail.gmail.comDiscussion:https://postgr.es/m/CA+hUKGKkp2XkvSe9nG+bsgkXVKCdTeGSa_TR0Qx1jafc_oqCVA@mail.gmail.com
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‎src/backend/libpq/pqcomm.c‎

Lines changed: 7 additions & 22 deletions
Original file line numberDiff line numberDiff line change
@@ -277,30 +277,15 @@ socket_close(int code, Datum arg)
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secure_close(MyProcPort);
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/*
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* On most platforms, we leave the socket open until the process dies.
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* This allows clients to perform a "synchronous close" if they care
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* --- wait till the transport layer reports connection closure, and
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* you can be sure the backend has exited. Saves a kernel call, too.
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* Formerly we did an explicit close() here, but it seems better to
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* leave the socket open until the process dies. This allows clients
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* to perform a "synchronous close" if they care --- wait till the
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* transport layer reports connection closure, and you can be sure the
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* backend has exited.
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*
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* However, that does not work on Windows: if the kernel closes the
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* socket it will invoke an "abortive shutdown" that discards any data
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* not yet sent to the client. (This is a flat-out violation of the
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* TCP RFCs, but count on Microsoft not to care about that.) To get
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* the spec-compliant "graceful shutdown" behavior, we must invoke
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* closesocket() explicitly. When using OpenSSL, it seems that clean
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* shutdown also requires an explicit shutdown() call.
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*
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* This code runs late enough during process shutdown that we should
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* have finished all externally-visible shutdown activities, so that
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* in principle it's good enough to act as a synchronous close on
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* Windows too. But it's a lot more fragile than the other way.
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* We do set sock to PGINVALID_SOCKET to prevent any further I/O,
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* though.
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*/
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#ifdefWIN32
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shutdown(MyProcPort->sock,SD_SEND);
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closesocket(MyProcPort->sock);
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#endif
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/* In any case, set sock to PGINVALID_SOCKET to prevent further I/O */
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MyProcPort->sock=PGINVALID_SOCKET;
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}
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}

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