Qt 4.4 QtConcurrent and libthread_xu

Hasso Tepper hasso at estpak.ee
Wed May 7 23:37:17 PDT 2008

Matthew Dillon wrote:
> Something in that chain of calls is passing a NULL to
> __pthread_mutex_trylock().

Yep, but ... 

> Try this patch.  It will do the same check that libc_r does.

It just makes backtraces huge. Obviously passing NULL to 
__pthread_mutex_trylock() isn't the problem, but probably just 

> I'm not convinced that Qt isn't broken, though, Qt shouldn't be passing
> NULL to the mutex functions, it should be passing the address of
> a pthread_mutex_t which itself can be NULL, but it should be
> passing NULL.

Qt doesn't pass NULL, it's glib. It doesn't mean that problem may not be 
in Qt though. Just to be sure I tested these examples in some other 
platforms and all these examples work fine in Linux, OpenBSD and FreeBSD.

I updated static binaries tarball to include debug info from glib as well.


Hasso Tepper

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