## Function: SB-THREAD:JOIN-THREAD
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> Suspend current thread until THREAD exits. Return the result values
> of the thread function.
> 
> If THREAD does not exit within TIMEOUT seconds and DEFAULT is
> supplied, return two values: 1) DEFAULT 2) :TIMEOUT. If DEFAULT is not
> supplied, signal a JOIN-THREAD-ERROR with JOIN-THREAD-PROBLEM equal
> to :TIMEOUT.
> 
> If THREAD does not exit normally (i.e. aborted) and DEFAULT is
> supplied, return two values: 1) DEFAULT 2) :ABORT. If DEFAULT is not
> supplied, signal a JOIN-THREAD-ERROR with JOIN-THREAD-PROBLEM equal
> to :ABORT.
> 
> If THREAD is the current thread, signal a JOIN-THREAD-ERROR with
> JOIN-THREAD-PROBLEM equal to :SELF-JOIN.
> 
> Trying to join the main thread causes JOIN-THREAD to block until
> TIMEOUT occurs or the process exits: when the main thread exits, the
> entire process exits.
> 
> NOTE: Return convention in case of a timeout is experimental and
> subject to change.

### Lambda list
```cl
(sb-thread:thread &key sb-thread::default sb-thread::timeout)
```