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Michael Paquier 54fb8c7ddf 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
2021-07-12 13:02:31 +09:00
config
contrib pageinspect: Improve page_header() for pages of 32kB 2021-07-12 11:05:27 +09:00
doc libpq: Fix sending queries in pipeline aborted state 2021-07-09 15:57:59 -04:00
src Fix issues with Windows' stat() for files pending on deletion 2021-07-12 13:02:31 +09:00
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.git-blame-ignore-revs Add pgindent commit to git-blame-ignore-revs file. 2021-06-28 09:22:24 -07:00
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aclocal.m4
configure Fix busted test for ldap_initialize. 2021-07-10 13:19:30 -04:00
configure.ac Fix busted test for ldap_initialize. 2021-07-10 13:19:30 -04:00
COPYRIGHT
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HISTORY
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README.git

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/.