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Update PQfree() documentation to be clearer, backpatch to 8.2.X.

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This commit is contained in:
Bruce Momjian 2007-02-19 22:06:30 +00:00
parent 7c2e6f31be
commit c2039e4477
1 changed files with 8 additions and 4 deletions
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12
doc/src/sgml/libpq.sgml
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@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/libpq.sgml,v 1.220.2.5 2007/02/06 03:05:00 tgl Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/libpq.sgml,v 1.220.2.6 2007/02/19 22:06:30 momjian Exp $ -->
<chapter id="libpq">
<title><application>libpq</application> - C Library</title>
@ -2611,9 +2611,13 @@ void PQfreemem(void *ptr);
<function>PQescapeBytea</function>,
<function>PQunescapeBytea</function>,
and <function>PQnotifies</function>.
It is needed by Microsoft Windows, which cannot free memory across
DLLs, unless multithreaded DLLs (<option>/MD</option> in VC6) are used.
On other platforms, this function is the same as the standard library function <function>free()</>.
It is particularly important that this function, rather than
<function>free()</>, be used on Microsoft Windows. This is because
allocating memory in a DLL and releasing it in the application works
only if multithreaded/single-threaded, release/debug, and static/dynamic
flags are the same for the DLL and the application. On non-Microsoft
Windows platforms, this function is the same as the standard library
function <function>free()</>.
</para>
</listitem>
</varlistentry>