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Document that forking while having open libpq connections is not

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advised.
This commit is contained in:
Bruce Momjian 2009-05-28 20:02:10 +00:00
parent 2e6107cb62
commit 400fb19a30
1 changed files with 11 additions and 1 deletions
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doc/src/sgml/libpq.sgml
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<!-- $PostgreSQL: pgsql/doc/src/sgml/libpq.sgml,v 1.288 2009/04/27 16:27:36 momjian Exp $ --> <!-- $PostgreSQL: pgsql/doc/src/sgml/libpq.sgml,v 1.289 2009/05/28 20:02:10 momjian Exp $ -->
<chapter id="libpq"> <chapter id="libpq">
<title><application>libpq</application> - C Library</title> <title><application>libpq</application> - C Library</title>
@ -64,6 +64,16 @@
whether a connection was successfully made before queries are sent whether a connection was successfully made before queries are sent
via the connection object. via the connection object.
<warning>
<para>
On Unix, forking a process with open libpq connections can lead to
unpredictable results because the parent and child processes share
the same sockets and operating system resources. For this reason,
such usage is not recommended, though doing an <function>exec</> from
the child process to load a new executable is safe.
</para>
</warning>
<note> <note>
<para> <para>
On Windows, there is a way to improve performance if a single On Windows, there is a way to improve performance if a single