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Date: Tue, 10 Jun 2003 09:25:43 +0200
From: Thomas Pfaff <tpfaff AT gmx DOT net>
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To: Rasmus Hahn <rassahah AT neofonie DOT de>
CC: cygwin <cygwin AT cygwin DOT com>
Subject: Re: Problem w/ c++,threads,static initializers
References: <20030607142449 DOT A4909 AT hamburg DOT neofonie DOT local>
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Rasmus Hahn wrote:

> Hello,
> 
> i am using cygwin on my Windows2000 and my c++ program segfaults
> when using pthread-mutexes. In particular i am using a lot of
> mutexes from within constructors of static objects. These constructors
> are called at a very early time of execution of the program and do
> calls of pthread_mutex_init, pthread_mutex_lock and such. Taken a glance
> at the cygwin source i noticed that the static initializers (constructors
> of static objects) are run _before_ some user_data->threadinterface is
> initialized (look at dll_crt0_1 () in winsup/cygwin/dcrt0.cc). Isnt it 
> possible to use thread-functions from static initializers?
> BTW i am using cygwin snapshot 20030602 compiled with gcc-3.3 since the
> out-of-the-box gcc from the cygwin-package is a prerelease and definitely
> contains bugs that do not allow it to compile my code.
> 

Could you provide a test case ?

I have done some tests and my constructors are run from
do_global_ctors if they are in the executable and from
dll_list::init if they are in a dll.
In both cases they are run when the cygwin dll is completely initialized.

Thomas



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