Multithreading problems

[Khem Raj]

Marshall Crocker said the following on 08/02/2006 01:48 PM:
> I did some digging in the uClibc emails and found out that the pthreads 
> library is  linuxthreads  and not NPTL which explains why mutexes 
> wouldn't work and also why I see several threads for my app instead of 
> one.  I also saw that NPTL work is being done for uClibc and should be 
> merged into the main NPTL tree.
>   
Well NPTL is another implementation of threading library. So I dont see 
how it can be related to your problem
> So now for the questions:  the deadlock I was seeing could this be a 
> result of not linking pthreads? 
if you dont link with pthreads you should have got linking errors. how 
were you able to link your code
> Actually, I am still seeing deadlock 
> even with -lpthreads so maybe it's a problem with my semaphores?  
Thats could be. You might have to debug it further.
> Why 
> can I compile without linking pthreads? 
thats a mystery you should know.
> Why does curl have problems in a 
> thread but not when it's in main()?  
curl is threadsafe as per their FAQ
http://curl.haxx.se/docs/faq.html#5.1
however they mention in multi-threaded environment, you
need to provide locking functions. which I think uclibc provides.
> Am I wrong in thinking that I would 
> have fewer problems with NPTL?
>   
I dont think that you will have your problem solved just by switching 
the threading library.
> I know most of these questions can't be answered without knowing a lot 
> more about my setup but is there anything major I'm overlooking? This is 
> my first try at writing a multithreaded app and considering that uClibc 
> threading is different from glibc there may be something I'm missing.
>
> Thanks in advance for any help.
>
> Marshall
>
>
>
>
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