Portions Copyright (c) 1994, Regents of the University of California Is that line needed for new files introduced by the Community?
Regards, On Sat, Sep 11, 2010 at 11:48 AM, Heikki Linnakangas <hei...@postgresql.org>wrote: > Log Message: > ----------- > Introduce latches. A latch is a boolean variable, with the capability to > wait until it is set. Latches can be used to reliably wait until a signal > arrives, which is hard otherwise because signals don't interrupt select() > on some platforms, and even when they do, there's race conditions. > > On Unix, latches use the so called self-pipe trick under the covers to > implement the sleep until the latch is set, without race conditions. On > Windows, Windows events are used. > > Use the new latch abstraction to sleep in walsender, so that as soon as > a transaction finishes, walsender is woken up to immediately send the WAL > to the standby. This reduces the latency between master and standby, which > is good. > > Preliminary work by Fujii Masao. The latch implementation is by me, with > helpful comments from many people. > > Modified Files: > -------------- > pgsql: > configure (r1.685 -> r1.686) > ( > http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/configure?r1=1.685&r2=1.686 > ) > configure.in (r1.633 -> r1.634) > ( > http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/configure.in?r1=1.633&r2=1.634 > ) > pgsql/src/backend/access/transam: > twophase.c (r1.63 -> r1.64) > ( > http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/access/transam/twophase.c?r1=1.63&r2=1.64 > ) > xact.c (r1.298 -> r1.299) > ( > http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/access/transam/xact.c?r1=1.298&r2=1.299 > ) > pgsql/src/backend/port: > Makefile (r1.28 -> r1.29) > ( > http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/port/Makefile?r1=1.28&r2=1.29 > ) > pgsql/src/backend/replication: > walsender.c (r1.29 -> r1.30) > ( > http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/replication/walsender.c?r1=1.29&r2=1.30 > ) > pgsql/src/backend/storage/ipc: > ipci.c (r1.104 -> r1.105) > ( > http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/storage/ipc/ipci.c?r1=1.104&r2=1.105 > ) > procsignal.c (r1.7 -> r1.8) > ( > http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/storage/ipc/procsignal.c?r1=1.7&r2=1.8 > ) > pgsql/src/include/replication: > walsender.h (r1.4 -> r1.5) > ( > http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/replication/walsender.h?r1=1.4&r2=1.5 > ) > pgsql/src/tools/msvc: > Mkvcbuild.pm (r1.59 -> r1.60) > ( > http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/tools/msvc/Mkvcbuild.pm?r1=1.59&r2=1.60 > ) > > Added Files: > ----------- > pgsql/src/backend/port: > unix_latch.c (r1.1) > ( > http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/port/unix_latch.c?rev=1.1&content-type=text/x-cvsweb-markup > ) > win32_latch.c (r1.1) > ( > http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/port/win32_latch.c?rev=1.1&content-type=text/x-cvsweb-markup > ) > pgsql/src/include/storage: > latch.h (r1.1) > ( > http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/storage/latch.h?rev=1.1&content-type=text/x-cvsweb-markup > ) > > -- > Sent via pgsql-committers mailing list (pgsql-committ...@postgresql.org) > To make changes to your subscription: > http://www.postgresql.org/mailpref/pgsql-committers > -- gurjeet.singh @ EnterpriseDB - The Enterprise Postgres Company http://www.EnterpriseDB.com singh.gurj...@{ gmail | yahoo }.com Twitter/Skype: singh_gurjeet Mail sent from my BlackLaptop device
