Re: [PATCH i-g-t] igt_core: add igt_constructor

From: Lyude Paul <lyude@redhat.com>
To: Chris Wilson <chris@chris-wilson.co.uk>
Cc: intel-gfx@lists.freedesktop.org
Subject: Re: [PATCH i-g-t] igt_core: add igt_constructor
Date: Wed, 21 Dec 2016 15:43:03 -0500	[thread overview]
Message-ID: <1482352983.19742.7.camel@redhat.com> (raw)
In-Reply-To: <20161221202543.GA11346@nuc-i3427.alporthouse.com>

On Wed, 2016-12-21 at 20:25 +0000, Chris Wilson wrote:
> On Wed, Dec 21, 2016 at 03:17:21PM -0500, Lyude wrote:
> > This is a simple macro for executing a block of code at the
> > beginning of
> > intel-gpu-tools, before any tests have been ran. Useful for
> > initialization of global resources used in IGT libraries.
> > 
> > Signed-off-by: Lyude <lyude@redhat.com>
> > ---
> >  configure.ac   |  1 +
> >  lib/igt_core.h | 13 +++++++++++++
> >  2 files changed, 14 insertions(+)
> > 
> > diff --git a/configure.ac b/configure.ac
> > index fa31a52..411bfab 100644
> > --- a/configure.ac
> > +++ b/configure.ac
> > @@ -65,6 +65,7 @@
> > AC_CHECK_TYPES([sighandler_t],[],[],[AC_INCLUDES_DEFAULT
> >  #include <signal.h>])
> >  AC_CHECK_FUNCS([swapctl])
> >  AC_CHECK_FUNCS([asprintf])
> > +AX_GCC_FUNC_ATTRIBUTE([constructor])
> >  
> >  dnl Check for POSIX timers
> >  AC_CHECK_FUNCS(timer_create, [], [
> > diff --git a/lib/igt_core.h b/lib/igt_core.h
> > index 661a634..e76fd5f 100644
> > --- a/lib/igt_core.h
> > +++ b/lib/igt_core.h
> > @@ -281,6 +281,19 @@ void igt_simple_init_parse_opts(int *argc,
> > char **argv,
> >  	} \
> >  	static void igt_tokencat(__real_main, __LINE__)(void) \
> >  
> > +/**
> > + * igt_constructor:
> > + *
> > + * Convenience macro to run the provided code block when igt first
> > starts,
> > + * before any tests have been run. This should be used for parts
> > of the igt
> > + * library that require initialization of objects with global
> > context.
> > + *
> > + * This code block will be executed exactly once.
> > + */
> > +#define igt_constructor \
> > +	static void __igt_constructor_block(void)
> > __attribute__((constructor)); \
> > +	static void __igt_constructor_block(void)
> 
> #define igt_constructor \
> __attribute__((constructor)) \
> static void igt_tokencat(__igt_constructor, __LINE__)(void)
> 
> Allows for the flexibility to use multiple constructors from the
> file.
> -chris

ooh, clever. will respin in just a sec.
> 
-- 
Cheers,
	Lyude
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