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Commitcf4cc78

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Improve postmaster's behavior if an accept() call fails. Because the server
socket is still read-ready, the code was a tight loop, wasting lots of CPU.We can't do anything to clear the failure, other than wait, but we should giveother processes more chance to finish and release FDs; so insert a small sleep.Also, avoid bogus "close(-1)" in this case. Per report from Jim Nasby.
1 parentb9c65ae commitcf4cc78

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2 files changed

+13
-4
lines changed

2 files changed

+13
-4
lines changed

‎src/backend/libpq/pqcomm.c

Lines changed: 10 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -30,7 +30,7 @@
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* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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*$PostgreSQL: pgsql/src/backend/libpq/pqcomm.c,v 1.189 2007/01/05 22:19:29 momjian Exp $
33+
*$PostgreSQL: pgsql/src/backend/libpq/pqcomm.c,v 1.190 2007/02/1319:18:53 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
@@ -528,7 +528,7 @@ Setup_AF_UNIX(void)
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/*
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* StreamConnection -- create a new connection with client using
531-
*server port.
531+
*server port. Set port->sock to the FD of the new connection.
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*
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* ASSUME: that this doesn't need to be non-blocking because
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*the Postmaster uses select() to tell when the server master
@@ -548,6 +548,14 @@ StreamConnection(int server_fd, Port *port)
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ereport(LOG,
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(errcode_for_socket_access(),
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errmsg("could not accept new connection: %m")));
551+
/*
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* If accept() fails then postmaster.c will still see the server
553+
* socket as read-ready, and will immediately try again. To avoid
554+
* uselessly sucking lots of CPU, delay a bit before trying again.
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* (The most likely reason for failure is being out of kernel file
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* table slots; we can do little except hope some will get freed up.)
557+
*/
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pg_usleep(100000L);/* wait 0.1 sec */
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returnSTATUS_ERROR;
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}
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‎src/backend/postmaster/postmaster.c

Lines changed: 3 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -37,7 +37,7 @@
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*
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/postmaster/postmaster.c,v 1.520 2007/02/11 11:59:25 mha Exp $
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* $PostgreSQL: pgsql/src/backend/postmaster/postmaster.c,v 1.521 2007/02/13 19:18:54 tgl Exp $
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*
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* NOTES
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*
@@ -1710,7 +1710,8 @@ ConnCreate(int serverFd)
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17111711
if (StreamConnection(serverFd,port)!=STATUS_OK)
17121712
{
1713-
StreamClose(port->sock);
1713+
if (port->sock >=0)
1714+
StreamClose(port->sock);
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ConnFree(port);
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port=NULL;
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}

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