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Robert Haas d18e75664a Remove CheckpointLock. Up until now, we've held this lock when performing a checkpoint or restartpoint, but commit `076a055acf` back in 2004 and commit `7e48b77b1c` from 2009, taken together, have removed all need for this. In the present code, there's only ever one process entitled to attempt a checkpoint: either the checkpointer, during normal operation, or the postmaster, during single-user operation. So, we don't need the lock. One possible concern in making this change is that it means that a substantial amount of code where HOLD_INTERRUPTS() was previously in effect due to the preceding LWLockAcquire() will now be running without that. This could mean that ProcessInterrupts() gets called in places from which it didn't before. However, this seems unlikely to do very much, because the checkpointer doesn't have any signal mapped to die(), so it's not clear how, for example, ProcDiePending = true could happen in the first place. Similarly with ClientConnectionLost and recovery conflicts. Also, if there are any such problems, we might want to fix them rather than reverting this, since running lots of code with interrupt handling suspended is generally bad. Patch by me, per an inquiry by Amul Sul. Review by Tom Lane and Michael Paquier. Discussion: http://postgr.es/m/CAAJ_b97XnBBfYeSREDJorFsyoD1sHgqnNuCi=02mNQBUMnA=FA@mail.gmail.com		2021-01-25 12:34:38 -05:00
config	Update copyright for 2021	2021-01-02 13:06:25 -05:00
contrib	Add a simple test for contrib/auto_explain.	2021-01-24 14:59:33 -05:00
doc	Remove CheckpointLock.	2021-01-25 12:34:38 -05:00
src	Remove CheckpointLock.	2021-01-25 12:34:38 -05:00
.dir-locals.el	Make Emacs perl-mode indent more like perltidy.	2019-01-13 11:32:31 -08:00
.editorconfig	Add .editorconfig	2019-12-18 09:13:13 +01:00
.gitattributes	gitattributes: Add new file	2019-11-12 08:13:55 +01:00
.gitignore	Support for optimizing and emitting code in LLVM JIT provider.	2018-03-22 11:05:22 -07:00
COPYRIGHT	Update copyright for 2021	2021-01-02 13:06:25 -05:00
GNUmakefile.in	Make install-tests target work with vpath builds	2020-05-31 18:33:00 -04:00
HISTORY	Canonicalize some URLs	2020-02-10 20:47:50 +01:00
Makefile	Don't unset MAKEFLAGS in non-GNU Makefile.	2019-06-25 09:36:21 +12:00
README	Canonicalize some URLs	2020-02-10 20:47:50 +01:00
README.git	Canonicalize some URLs	2020-02-10 20:47:50 +01:00
aclocal.m4	Remove configure-time probe for DocBook DTD.	2020-11-30 15:24:13 -05:00
configure	Introduce SHA1 implementations in the cryptohash infrastructure	2021-01-23 11:33:04 +09:00
configure.ac	Introduce SHA1 implementations in the cryptohash infrastructure	2021-01-23 11:33:04 +09:00

README

PostgreSQL Database Management System
=====================================

This directory contains the source code distribution of the PostgreSQL
database management system.

PostgreSQL is an advanced object-relational database management system
that supports an extended subset of the SQL standard, including
transactions, foreign keys, subqueries, triggers, user-defined types
and functions.  This distribution also contains C language bindings.

PostgreSQL has many language interfaces, many of which are listed here:

	https://www.postgresql.org/download/

See the file INSTALL for instructions on how to build and install
PostgreSQL.  That file also lists supported operating systems and
hardware platforms and contains information regarding any other
software packages that are required to build or run the PostgreSQL
system.  Copyright and license information can be found in the
file COPYRIGHT.  A comprehensive documentation set is included in this
distribution; it can be read as described in the installation
instructions.

The latest version of this software may be obtained at
https://www.postgresql.org/download/.  For more information look at our
web site located at https://www.postgresql.org/.