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Re: at exit alternative for AIX

From: Ian Lance Taylor <iant at google dot com>
To: Perry Smith <pedzsan at gmail dot com>
Cc: gcc at gcc dot gnu dot org
Date: Sun, 5 Aug 2012 10:18:15 -0700
Subject: Re: at exit alternative for AIX
References: <EA5983AC-20FC-4ACA-87AE-823D13B4AC4D@gmail.com> <CAKOQZ8z=npS-DTgy6JnNKVym97s37t7FubiR=Mkczs0NPJEqcA@mail.gmail.com> <ABC48239-12FF-4621-8281-C643DCFE4AD7@gmail.com>

On Sun, Aug 5, 2012 at 6:56 AM, Perry Smith <pedzsan@gmail.com> wrote:
>
> Part of my confusion / concern is "why have two methods?"
> Does the spec say that dtors much be called at different times?

The use of _GLOBAL_FD in GCC is AIX-specific, and appears to be
required to get destructors in shared libraries to run correctly when
the entire program exits.  The use of atexit instead of __cxa_atexit
is not AIX specific, but is an attempt to make shared library
destructors work correctly on systems without __cxa_atexit, when there
is no chance to run them at dlclose time.  I don't know the history
here, but it's quite possible that the two ideas were implemented
separately, and that nobody has ever really tried to make dlclose run
destructors correctly on AIX.

Ian

References:
- at exit alternative for AIX
  - From: Perry Smith
- Re: at exit alternative for AIX
  - From: Ian Lance Taylor
- Re: at exit alternative for AIX
  - From: Perry Smith

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