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Re: [Qemu-devel] [PATCH v10 5/8] module: implement module loading

From: Paolo Bonzini
Subject: Re: [Qemu-devel] [PATCH v10 5/8] module: implement module loading
Date: Mon, 16 Sep 2013 13:33:06 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130805 Thunderbird/17.0.8

Il 16/09/2013 13:29, Fam Zheng ha scritto:
> An idea for single .so file:
>     - before loads a .so, an empty initializer list is created.
>     - module_init adds a __attribute__((constructor)) function, which appends
>       its real initializer to the initializer list. So this function is
>       automatically called after dlopen().
>     - make init_$(date +%s$$$RANDOM) a dummy symbol.
>     - module_load first checks the presense of the symbol, if yes, call the
>       functions in the initializer list. Else clean up and unload .so.
> Does this enable multiple calls of module_init()?

Yes.  Basically you are delaying the constructors; that would work.

> OTOH. As for multiple spice modules, is it possible to solve it by having a
> spice-common.o and link all spice modules to it, to share code?

Looks like there is global state in ui/spice-core.c, so likely no.


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