How reach all threads of the same servlet ??

hi !
I would like to have the possibility to interrupt all threads that are implementing the same servlet (each client has one thread) so that they all recalculate something :
I've tried with a synchronized in a POST method : it works but with only one thread of the servlet, all other threads that implement the same servlet are continuing their work : has someone an idea how to do that, to go into the code of ALL running threads ??
it would be vey good please...

just put the code INSIDE the servlet and it'll reach all clients. of course, u have to determine the condition for that block of code to execute.

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