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Commit42f8326

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Call pqPipelineFlush from PQsendFlushRequest
When PQsendFlushRequest() was added by commit69cf1d5, we arguedagainst adding a PQflush() call in it[1]. This is still the rightdecision: if the user wants a flush to occur, they can just call that.However, we failed to realize that the message bytes could still begiven to the kernel for transmitting when this can be made withoutblocking. That's what pqPipelineFlush() does, and it is done for everysingle other message type sent by libpq, so do that.(When the socket is in blocking mode this may indeed block, but that'swhat all the other libpq message-sending routines do, too.)[1]https://www.postgresql.org/message-id/202106252352.5ca4byasfun5%40alvherre.pgsqlAuthor: Jelte Fennema-Nio <postgres@jeltef.nl>Discussion:https://postgr.es/m/CAGECzQTxZRevRWkKodE-SnJk1Yfm4eKT+8E4Cyq3MJ9YKTnNew@mail.gmail.com
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‎src/interfaces/libpq/fe-exec.c

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@@ -3235,6 +3235,14 @@ PQsendFlushRequest(PGconn *conn)
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return0;
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}
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/*
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* Give the data a push (in pipeline mode, only if we're past the size
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* threshold). In nonblock mode, don't complain if we're unable to send
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* it all; PQgetResult() will do any additional flushing needed.
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*/
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if (pqPipelineFlush(conn)<0)
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return0;
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return1;
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}
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