guts of Dynaloader

xiaoyafeng has asked for the wisdom of the Perl Monks concerning the following question:

Hi gurus,

~~I'm now interested in guts Dynaloader. Where can I find the guts doc about it(and bootstrap etc.)~~

I reorganize my expression, hope it can make my question more clear.

I know perl put all dll/lib files in auto directory. and use it by Dynaloader. many years, I just use it, create it by h2xs. but don't think too much about its mechanics.

Along with my C knowledge rich up, I am more and more curious :

how perl call dynamic library in compile stage (use XYZ::XS module;)? I guess it seems like LoadLibrary function in windows
how perl call dynamic library in run time stage (require XYZ::XS module?)
I notice a bootstrap statement in pm file, what it does mean? and how does it work?

Thanks!

I am trying to improve my English skills, if you see a mistake please feel free to reply or /msg me a correction

Comment on guts of Dynaloader

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Re: internal about Dynaloader by quester (Vicar) on Apr 20, 2012 at 06:19 UTC
Dynaloader is a CPAN module, so a Google search for "cpan Dynaloader" will have the Dynaloader POD documentation as the first result. You could also get that with the command `perldoc Dynaloader` on a system with Perl (and Dynaloader) installed. You can look at the source code with the "Source" link near the top left of the CPAN web page. If you are on a Unix-like system, `locate -i DynaLoader.pm` should find a copy of the source code on your system. If you have a more specific question after looking through the source code feel free to ask.	[reply] [d/l] [select]
Re: guts of Dynaloader by syphilis (Archbishop) on Apr 20, 2012 at 12:13 UTC
Both `use XYZ::XS;` and `require XYZ::XS;` load the dll in exactly the same way (by using LoadLibrary on Windows). The only difference (afaik) in the loading of the dll is in when it happens. If you `use XYZ::XS;` then the loading is done at script compile-time (whenever the compilation process gets to that compile-time command). And if you `require XYZ::XS;` then the loading is done at script run-time (whenever the execution process gets to that run-time command). Cheers, Rob	[reply] [d/l] [select]
Re: internal about Dynaloader by xiaoyafeng (Deacon) on Apr 20, 2012 at 08:27 UTC
hope the post updated can express my questions more clear. ;) I am trying to improve my English skills, if you see a mistake please feel free to reply or /msg me a correction	[reply]
Re^2: internal about Dynaloader by Anonymous Monk on Apr 20, 2012 at 09:15 UTC
sadly I don't think the answer changes :) See use/require, http://perl5.git.perl.org/perl.git/tree/HEAD:/ext/DynaLoader after pod/README see http://perl5.git.perl.org/perl.git/blob/HEAD:/ext/DynaLoader/dl_win32.xs dl_load_file does eventually LoadLibrary, but its a long path (lots of defines) I've not seen a book/tutorial that covers everything you're looking for, but these links may help: Re: Using a shared object in perl, Manning: Extending and Embedding Perl jenness_ch02.pdf, XSLoader, DynaLoader	[reply]
Re: internal about Dynaloader by Anonymous Monk on Apr 20, 2012 at 05:24 UTC
UTSL	[reply]