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Introduce latches. A latch is a boolean variable, with the capability to

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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.
This commit is contained in:
Heikki Linnakangas
2010-09-11 15:48:04 +00:00
parent 81624db39a
commit 2746e5f21d
13 changed files with 928 additions and 39 deletions
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3
src/tools/msvc/Mkvcbuild.pm
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@ -3,7 +3,7 @@ package Mkvcbuild;
#
# Package that generates build files for msvc build
#
# $PostgreSQL: pgsql/src/tools/msvc/Mkvcbuild.pm,v 1.59 2010/07/02 23:25:27 adunstan Exp $
# $PostgreSQL: pgsql/src/tools/msvc/Mkvcbuild.pm,v 1.60 2010/09/11 15:48:04 heikki Exp $
#
use Carp;
use Win32;
@ -64,6 +64,7 @@ sub mkvcbuild
$postgres->ReplaceFile('src\backend\port\dynloader.c','src\backend\port\dynloader\win32.c');
$postgres->ReplaceFile('src\backend\port\pg_sema.c','src\backend\port\win32_sema.c');
$postgres->ReplaceFile('src\backend\port\pg_shmem.c','src\backend\port\win32_shmem.c');
$postgres->ReplaceFile('src\backend\port\pg_latch.c','src\backend\port\win32_latch.c');
$postgres->AddFiles('src\port',@pgportfiles);
$postgres->AddDir('src\timezone');
$postgres->AddFiles('src\backend\parser','scan.l','gram.y');