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From s...@apache.org
Subject cvs commit: modperl-docs/src/docs/1.0/guide install.pod
Date Fri, 06 Aug 2004 23:34:34 GMT
stas        2004/08/06 16:34:34

  Modified:    src/docs/1.0/guide install.pod
  Log:
  rewrite the section that talks about using Perl w/ -Dusemymalloc for
  mod_perl DSO
  
  Revision  Changes    Path
  1.26      +37 -20    modperl-docs/src/docs/1.0/guide/install.pod
  
  Index: install.pod
  ===================================================================
  RCS file: /home/cvs/modperl-docs/src/docs/1.0/guide/install.pod,v
  retrieving revision 1.25
  retrieving revision 1.26
  diff -u -u -r1.25 -r1.26
  --- install.pod	18 Mar 2004 20:23:01 -0000	1.25
  +++ install.pod	6 Aug 2004 23:34:34 -0000	1.26
  @@ -1050,40 +1050,57 @@
   without having to mangle the Apache source tree for mod_perl.  It also
   gives you the freedom to add third-party modules.
   
  -=head2 When DSO can be Used
   
  -If you want to build C<mod_perl> as DSO you must make sure that Perl
  -was built with system's native malloc(). If Perl was built with its
  -own malloc() and C<-Dbincompat5005>, it pollutes the main C<httpd>
  -program with I<free> and I<malloc> symbols.  When C<httpd> restarts
  -(happens at startup too), any references in the main program to
  -I<free> and I<malloc> become invalid, and this causes memory leaks and
  -segfaults.
   
  -Notice that mod_perl's build system warns about this problem.
   
  -With Perl 5.6.0+ this pollution can be prevented with
  -C<-Ubincompat5005>.  or C<-Uusemymalloc> for any version of Perl, but
  -there's a chance that might hurt performance depending on platform, so
  -C<-Ubincompat5005> is likely a better choice.
   
  -If you get the following reports with Perl version 5.6.0+:
  +
  +
  +=head2 When DSO can be Used
  +
  +Perl versions prior to 5.6.0, built with C<-Dusemymalloc>, and
  +versions 5.6.0 and higher, built with C<-Dusemymalloc> and
  +C<-Dbincompat5005>, pollutes the main C<httpd> program with I<free>
  +and I<malloc> symbols.  When C<httpd> restarts (happens at startup
  +too), any references in the main program to I<free> and I<malloc>
  +become invalid, and this causes memory leaks and segfaults.
  +
  +First check which malloc, your Perl was built with, by running:
   
     % perl -V:usemymalloc
  +
  +If you get:
  +
  +  usemymalloc='n';
  +
  +which means that Perl is using the system malloc, mod_perl will work
  +fine as DSO. Continue reading this section if it's not the case.
  +
  +If you get:
  +
     usemymalloc='y';
  +
  +that means that Perl is using its own malloc. If you are running Perl
  +older than 5.6.0, you must rebuild Perl with C<-Uusemymalloc>. If you
  +are running Perl 5.6.0 and higher, you must make sure that you have
  +the binary compatibility with Perl 5.005 turned off. To check, run:
  +
     % perl -V:bincompat5005
  +
  +If you get:
  +
     bincompat5005='define';
   
  -rebuild Perl with C<-Ubincompat5005>.
  +then you must rebuild Perl with C<-Ubincompat5005>. You can continue
  +using Perl's malloc if that's a better choice for your OS.
  +
  +Notice that mod_perl's build system warns about this problem.
  +
  +If you needed to rebuild Perl don't forget to rebuild mod_perl too.
   
  -For Perl versions pre-5.6.x, if you get:
   
  -  % perl -V:usemymalloc
  -  usemymalloc='y';
   
  -rebuild Perl with C<-Uusemymalloc>.
   
  -Now rebuild mod_perl.
   
   =head2 Build mod_perl as a DSO inside the Apache Source Tree via APACI
   
  
  
  

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