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Michael Paquier f1cf64167f Fix issues with Windows' stat() for files pending on deletion 
The code introduced by bed9075 to enhance the stat() implementation on
Windows for file sizes larger than 4GB fails to properly detect files
pending for deletion with its method based on NtQueryInformationFile()
or GetFileInformationByHandleEx(), as proved by Alexander Lakhin in a
custom TAP test of his own.

The method used in the implementation of open() to sleep and loop when
when failing on ERROR_ACCESS_DENIED (EACCES) is showing much more
stability, so switch to this method.  This could still lead to issues if
the permission problem stays around for much longer than the timeout of
1 second used, but that should (hopefully) never happen in
performance-critical paths.  Still, there could be a point in increasing
the timeouts for the sake of machines that handle heavy loads.

Note that WIN32's open() now uses microsoft_native_stat() as it should
be similar to stat() when working around issues with concurrent file
deletions.

I have spent some time testing this patch with pgbench in combination
of the SQL functions from genfile.c, as well as running the TAP test
provided on the thread with MSVC builds, and this looks much more
stable than the previous method.

Author: Alexander Lakhin
Reviewed-by: Tom Lane, Michael Paquier,	Justin Pryzby
Discussion: https://postgr.es/m/c3427edf-d7c0-ff57-90f6-b5de3bb62709@gmail.com
Backpatch-through: 14
(cherry picked from commit 54fb8c7ddf)

Author: Alexandra Wang <alexandra.wang.oss@gmail.com>
2024-11-08 09:41:47 +10:30
config Log LLVM library version in configure output. 2023-10-22 14:32:31 +13:00
contrib Replace usages of xmlXPathCompile() with xmlXPathCtxtCompile(). 2024-09-15 13:33:09 -04:00
doc doc: Reword ALTER TABLE ATTACH restriction on NO INHERIT constraints 2024-11-07 14:06:24 +01:00
src Fix issues with Windows' stat() for files pending on deletion 2024-11-08 09:41:47 +10:30
.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
.git-blame-ignore-revs Backpatch addition of .git-blame-ignore-revs 2022-08-05 19:36:24 +02:00
.gitattributes gitattributes: Add new file 2019-11-12 08:13:55 +01:00
.gitignore Add portlock directory to .gitignore 2022-11-26 07:47:16 -05:00
aclocal.m4 Probe $PROVE not $PERL while checking for modules needed by TAP tests. 2021-11-22 12:54:52 -05:00
configure Fix our Windows stat() emulation to handle file sizes > 4GB. 2024-11-08 09:40:48 +10:30
configure.in Fix our Windows stat() emulation to handle file sizes > 4GB. 2024-11-08 09:40:48 +10:30
COPYRIGHT Update copyright for 2024 2024-01-03 20:49:04 -05:00
GNUmakefile.in Remove temporary portlock directory during make [dist]clean. 2022-11-26 10:30:58 -05:00
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

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/.