pb : semaphore crashing with kernel 2..4.x

[Stephane Domas,,,]

hello

I'm writing you to ask if you already seen problems with semaphore and 
thread termination under kernel 2.4.X.
To describe more precisely my problem :

I launch a process, which instanciate 7 semaphores, agregate in a 
Handler object. Then the process  launches 3 threads (let's call them S, 
R, and C). These three threads own the Handler object, so they can post 
and/or wait on these semaphore. 3 first semaphore are used by the 
process to wake up S,R,C and the three others are used by S, R and C to 
signal to the process that they are stopped.

Further in the execution, the process launches a new thread (let's call 
it T) that also owns the handler object. And for an obscur reason, when 
this thread or another one do a post on the the 7th semaphore, it 
crashes. Very surprisingly, this crash does not occur on a 2.6.X kernel.

Another bug [ if I do not post on the 7th semaphore ] : if I let the 
last thread T ends himself, it calls the final method which only 
contains a message print. This works well. But ... if the thread do a 
long sleep [ just before the end of run() ], and the process tries to 
delete it (calling terminate in the destructor of T), the thread prints 
out the message and then blocks infinitely. Thus, ending itself works 
but forcing a thread to terminate does not work. Once again, this bug 
disappear when using a 2.6.8 kernel !

Have you any idea on why this behaviour ??

Thanx
S. Domas

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