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Commitb496645

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Do not return from PQrequestCancel until postmaster has finished
processing the request; this ensures that the request won't be takento cancel a subsequently-issued query. Race condition originallynoted by Oliver Jowett in the context of JDBC, but libpq has it too.
1 parentbf2f5d9 commitb496645

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‎src/interfaces/libpq/fe-connect.c

Lines changed: 18 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/interfaces/libpq/fe-connect.c,v 1.261 2003/09/22 00:23:35 petere Exp $
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* $Header: /cvsroot/pgsql/src/interfaces/libpq/fe-connect.c,v 1.262 2003/10/02 19:52:44 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
@@ -2262,7 +2262,23 @@ PQrequestCancel(PGconn *conn)
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gotocancel_errReturn;
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}
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/* Sent it, done */
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/*
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* Wait for the postmaster to close the connection, which indicates that
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* it's processed the request. Without this delay, we might issue another
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* command only to find that our cancel zaps that command instead of the
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* one we thought we were canceling. Note we don't actually expect this
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* read to obtain any data, we are just waiting for EOF to be signaled.
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*/
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retry5:
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if (recv(tmpsock, (char*)&crp,1,0)<0)
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{
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if (SOCK_ERRNO==EINTR)
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/* Interrupted system call - we'll just try again */
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gotoretry5;
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/* we ignore other error conditions */
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}
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/* All done */
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closesocket(tmpsock);
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#ifdefWIN32
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WSASetLastError(save_errno);

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