I have updated the PQfree documentation; patch attached. Backpatched
to 8.2.X.
---------------------------------------------------------------------------
Zeugswetter Andreas ADI SD wrote:
>
> > > future for some reason. (the doc for the other functions say you
> have to
> > > use PQfreemem without mentioning any exceptions)
> > >
> > > Thoughts? Rip out or update?
> >
> > Are you saying that almost all Win32 binaries and libraries now can
> free
> > across DLLs?
>
> You can under very narrow conditions. You need to force code generation
> for "Multithreaded DLL" run-time libraries (e.g. in VC6 msvcrt.dll)
> for all exe's and dll's.
> This is bad for debugging, memory checkers and probably impossible
> when using different compilers.
> So you really need PQfreemem.
>
> Andreas
--
Bruce Momjian <bruce@momjian.us> http://momjian.us
EnterpriseDB http://www.enterprisedb.com
+ If your life is a hard drive, Christ can be your backup. +
Index: doc/src/sgml/libpq.sgml
===================================================================
RCS file: /cvsroot/pgsql/doc/src/sgml/libpq.sgml,v
retrieving revision 1.231
diff -c -c -r1.231 libpq.sgml
*** doc/src/sgml/libpq.sgml 16 Feb 2007 16:37:29 -0000 1.231
--- doc/src/sgml/libpq.sgml 19 Feb 2007 22:04:28 -0000
***************
*** 2617,2625 ****
<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()</>.
</para>
</listitem>
</varlistentry>
--- 2617,2629 ----
<function>PQescapeBytea</function>,
<function>PQunescapeBytea</function>,
and <function>PQnotifies</function>.
! 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>
