David Xu 6f54e82927 If a thread was detached, return EINVAL instead, the error code
is also returned by pthread_detach() if a thread was already
detached, the error code was already documented:

>    [EINVAL]	The implementation has detected that the value speci-
>		fied by thread does not refer to a joinable thread.
2006-11-28 11:05:31 +00:00
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