Subj : Re: I write a multithread program with pthread, and meet a program
To   : comp.programming.threads
From : Loic Domaigne
Date : Mon Apr 11 2005 09:37 pm

Hello,

> But I am still surprised that the new thread can not be stopped
> correctly.

You still didn't told us which Pthreads implementation you are using. 
LinuxThreads or NPTL?

Does the effect subsists when doing the following export before running 
the program?
bash$ export LD_ASSUME_KERNEL=2.4.19

> cout may be a cancellation point or not.
> Theoritically, if cout is not a cancellation point, the new thread will
> continue to run when the main thread call pthread_cancel(); if it is
> cancellation point, the new thread will be stopped.
> But as a matter of fact, the new thread does not run and is not
> stopped. In linux, the new thread will be a zombie.
> What I want to know is why.

It's only a theory at that point... But it looks like a bug in the 
libstdc++ or the libpthread, when a thread is being cancelled while 
writting on cout.


Regards,
Loic.

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