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Commitb3fe098

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Add GUC to show EXEC_BACKEND state
There is no straightforward way to determine if a cluster is runningin EXEC_BACKEND mode or not, which is useful for tests to know. Thisadds a GUC debug_exec_backend similar to debug_assertions which willbe true when the server is running in EXEC_BACKEND mode.Author: Daniel Gustafsson <daniel@yesql.se>Reviewed-by: Chao Li <li.evan.chao@gmail.com>Reviewed-by: Álvaro Herrera <alvherre@kurilemu.de>Reviewed-by: Peter Eisentraut <peter@eisentraut.org>Discussion:https://postgr.es/m/5F301096-921A-427D-8EC1-EBAEC2A35082@yesql.se
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‎doc/src/sgml/config.sgml‎

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@@ -11833,6 +11833,23 @@ dynamic_library_path = '/usr/local/lib/postgresql:$libdir'
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</listitem>
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</varlistentry>
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<varlistentry id="guc-debug-exec-backend" xreflabel="debug_exec_backend">
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<term><varname>debug_exec_backend</varname> (<type>boolean</type>)
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<indexterm>
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<primary><varname>debug_exec_backend</varname> configuration parameter</primary>
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</indexterm>
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</term>
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<listitem>
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<para>
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Reports whether <productname>PostgreSQL</productname> has been built
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with <literal>EXEC_BACKEND</literal> enabled. That is the case on
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<systemitem class="osname">Windows</systemitem> or if the
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macro <symbol>EXEC_BACKEND</symbol> is defined
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when <productname>PostgreSQL</productname> is built.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry id="guc-huge-pages-status" xreflabel="huge_pages_status">
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<term><varname>huge_pages_status</varname> (<type>enum</type>)
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<indexterm>

‎src/backend/utils/misc/guc_parameters.dat‎

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max => 'MAX_DEBUG_DISCARD_CACHES',
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},
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{ name => 'debug_exec_backend', type => 'bool', context => 'PGC_INTERNAL', group => 'PRESET_OPTIONS',
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short_desc => 'Shows whether the running server is built with EXEC_BACKEND enabled.',
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flags => 'GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE',
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variable => 'exec_backend_enabled',
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boot_val => 'EXEC_BACKEND_ENABLED',
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},
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{ name => 'debug_io_direct', type => 'string', context => 'PGC_POSTMASTER', group => 'DEVELOPER_OPTIONS',
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short_desc => 'Use direct I/O for file access.',
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long_desc => 'An empty string disables direct I/O.',

‎src/backend/utils/misc/guc_tables.c‎

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#endif
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staticboolassert_enabled=DEFAULT_ASSERT_ENABLED;
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#ifdefEXEC_BACKEND
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#defineEXEC_BACKEND_ENABLED true
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#else
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#defineEXEC_BACKEND_ENABLED false
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#endif
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staticboolexec_backend_enabled=EXEC_BACKEND_ENABLED;
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staticchar*recovery_target_timeline_string;
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staticchar*recovery_target_string;
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staticchar*recovery_target_xid_string;

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