[PATCH] pthread key destructor

[Thomas Pfaff]

See
http://www.opengroup.org/onlinepubs/007904975/functions/pthread_key_create.html

I do not think that we should support more than one iterations at the
moment. This seems to be a rather new addition to the pthread
specification.

2002-09-23  Thomas Pfaff  <tpfaff@gmx.net>

	* thread.cc (pthread_key::run_destructor): Run destructor only if
	key value is not NULL.
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