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Tom Lane da9456d22a Add an isolation test to exercise parallel-worker deadlock resolution. 
Commit a1c1af2a1 added logic in the deadlock checker to handle lock
grouping, but it was very poorly tested, as evidenced by the bug
fixed in 3420851a2.  Add a test case that exercises that a bit better
(and catches the bug --- if you revert 3420851a2, this will hang).

Since it's pretty hard to get parallel workers to take exclusive
regular locks that their parents don't already have, this test operates
by creating a deadlock among advisory locks taken in parallel workers.
To make that happen, we must override the parallel-safety labeling of
the advisory-lock functions, which we do by putting them in mislabeled,
non-inlinable wrapper functions.

We also have to remove the redundant PreventAdvisoryLocksInParallelMode
checks in lockfuncs.c.  That seems fine though; if some user accidentally
does what this test is intentionally doing, not much harm will ensue.
(If there are any remaining bugs that are reachable that way, they're
probably reachable in other ways too.)

Discussion: https://postgr.es/m/3243.1564437314@sss.pgh.pa.us
2019-08-01 11:50:00 -04:00
config Update config.guess and config.sub 2019-04-27 14:25:00 +02:00
contrib Fix handling of previous password hooks in passwordcheck 2019-08-01 09:37:28 +09:00
doc Run UTF8-requiring collation tests by default 2019-07-31 09:46:51 +02:00
src Add an isolation test to exercise parallel-worker deadlock resolution. 2019-08-01 11:50:00 -04:00
.dir-locals.el Make Emacs perl-mode indent more like perltidy. 2019-01-13 11:32:31 -08:00
.gitattributes Add XSL stylesheet to fix up SVG files 2019-06-19 21:26:42 +02:00
.gitignore Support for optimizing and emitting code in LLVM JIT provider. 2018-03-22 11:05:22 -07:00
aclocal.m4 Fix configure's AC_CHECK_DECLS tests to work correctly with clang. 2018-11-19 12:01:47 -05:00
configure Remove support for non-ELF BSD systems 2019-07-01 23:56:20 +01:00
configure.in Remove support for non-ELF BSD systems 2019-07-01 23:56:20 +01:00
COPYRIGHT Update copyright for 2019 2019-01-02 12:44:25 -05:00
GNUmakefile.in Integrate cpluspluscheck into build system. 2019-05-31 12:36:17 -07:00
HISTORY Change documentation references to PG website to use https: not http: 2017-05-20 21:50:47 -04:00
Makefile Don't unset MAKEFLAGS in non-GNU Makefile. 2019-06-25 09:36:21 +12:00
README Change documentation references to PG website to use https: not http: 2017-05-20 21:50:47 -04:00
README.git Change documentation references to PG website to use https: not http: 2017-05-20 21:50:47 -04:00

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/.