Re: pgsql: Introduce latches.
От | Gurjeet Singh |
---|---|
Тема | Re: pgsql: Introduce latches. |
Дата | |
Msg-id | AANLkTinVwYLPzwXsob-r5+KrEiaO=x5S7k1d+P0YjrE6@mail.gmail.com обсуждение исходный текст |
Ответ на | pgsql: Introduce latches. (heikki@postgresql.org (Heikki Linnakangas)) |
Ответы |
Re: pgsql: Introduce latches.
(Tom Lane <tgl@sss.pgh.pa.us>)
|
Список | pgsql-committers |
Portions Copyright (c) 1994, Regents of the University of California
Is that line needed for new files introduced by the Community?
Regards,
--
gurjeet.singh
@ EnterpriseDB - The Enterprise Postgres Company
http://www.EnterpriseDB.com
singh.gurjeet@{ gmail | yahoo }.com
Twitter/Skype: singh_gurjeet
Mail sent from my BlackLaptop device
Is that line needed for new files introduced by the Community?
Regards,
On Sat, Sep 11, 2010 at 11:48 AM, Heikki Linnakangas <heikki@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-committers@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.gurjeet@{ gmail | yahoo }.com
Twitter/Skype: singh_gurjeet
Mail sent from my BlackLaptop device
В списке pgsql-committers по дате отправления:
Предыдущее
От: joe@postgresql.org (Joe Conway)Дата:
Сообщение: pgsql: SERIALIZABLE transactions are actually implemented beneath the