[Xen-devel] Re: Error reporting capabilities for libxc

[Anthony Liguori <aliguori@xxxxxxxxxx>]

Daniel P. Berrange wrote:
> I'm doing this on FC6 - the __thread annotation is the same approach
> used in libc for the per-thread errno variable, hence why I chose it
> try it initially. The version are:
>
>   glibc-2.5-3
>   gcc-4.1.1-30
>
>   
> > I've found in the past that __thread can have problems when using shared 
> > libraries (the exact instance was a Python binding).
> >     
> I've not explicitly tested this integrating with the python bindings
> and ensuring the correct per-thread operation.
>   
Will the python bindings actually load?  In the past, I've not been able 
to import a module that contains __thread variables.
Regards,

Anthony Liguori

> One further issue I've thought of is that the __thread annotation does
> not provide any way to do cleanup when a thread exists. Fine if the
> per-thread variable is a simple scalar, but not so good if its a char *
> since I think it'll leak memory. So I think I may have no choice by to
> re-write with pthread_getspecific(), since that allows registration
> of a cleanup function to free memory.
>
> Regards,
> Dan.
>   

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