Re: problems building trunk in OpenBSD/i386

[Jan Djärv]

Ken Raeburn skrev:
> The other parts of the stack trace indicate that the rest of the loop is 
> in the C library -- pthread_once calls pthread_mutex_lock, which 
> initializes some thread support code, which is causing some priority 
> queue code to try to allocate storage, which winds up calling into 
> gmalloc, which again ensures that initialization has been done by 
> calling pthread_once.

This sounds like a bug in pthread_once.

> The thread support in gmalloc.c appears to be turned on when gtk is 
> available and selected and has the new file chooser interface, and 
> pthread support is available.
>
> As to how to fix it... I have no good idea at the moment.  I assume 
> OpenBSD uses GCC exclusively; if the platform supports constructor 
> attributes on functions, perhaps we could force __malloc_initialize to 
> be called at program startup, without thread protection, and hope that 
> threads don't get created before main starts.  It seems a bit dicey, but 
> hey, so is replacing malloc. :-)  Trying to detect recursive calls as 
> opposed to simultaneous calls from multiple threads seems tricky, with 
> some of the thread support unavailable until after we finish.

I think we safely can call malloc_initialize from main itself without thread 
protection.  The protection is from threads created by the file dialog, and 
they get created when the dialog is first used.  So we should be safe.

        Jan D.