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basiclib/DynaLoader.pm-txt  view on Meta::CPAN

This function is optional and may not necessarily be provided on all platforms.
If it is defined, it is called automatically when the interpreter exits for
every shared object or library loaded by DynaLoader::bootstrap.  All such
library references are stored in @dl_librefs by DynaLoader::Bootstrap as it
loads the libraries.  The files are unloaded in last-in, first-out order.

This unloading is usually necessary when embedding a shared-object perl (e.g.
one configured with -Duseshrplib) within a larger application, and the perl
interpreter is created and destroyed several times within the lifetime of the
application.  In this case it is possible that the system dynamic linker will
unload and then subsequently reload the shared libperl without relocating any
references to it from any files DynaLoaded by the previous incarnation of the
interpreter.  As a result, any shared objects opened by DynaLoader may point to
a now invalid 'ghost' of the libperl shared object, causing apparently random
memory corruption and crashes.  This behaviour is most commonly seen when using
Apache and mod_perl built with the APXS mechanism.

    SunOS: dlclose($libref)
    HP-UX: ???
    Linux: ???
    NeXT:  ???