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Problem in pthread_cancel() ?

	I don't know whether I am mis-using	pthreads or if 
	there is a problem in the pthreads-win32 implementation.

	When my process is closing down I want all pthreads
	to complete before I finally return from the process.
	To do this I send a pthread_cancel() to those threads
	that are blocking (on an accept() or a recv() call)
	on Linux this works but with pthread-win32 if I call
	pthread_cancel() from the main process the process
	core dumps. If I create a thread and call cancel()
	from the thread then everything works fine.

	I had a quick look at the code for pthread_cancel() and
	the problem seems to be that pthread_cancel() tests
	whether it is being called to cancel the calling thread
	and references the variable 'self'. But since I call the
	function from the process and not from a thread self
	is NULL, so as soon as self is dereferenced the process

	I have fixed my problem by creating a thread to call
	cancel, and I've also hacked the pthread-win32 code 
	so that if self is NULL pthread_cancel() does not
	try to defreference it.  I would like to know whether
	I'm trying to do something illegal as far as pthreads
	are concerned or whether there is a bug in the win32 


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