It seems to me that there should be a problem--thr1 could be sitting their idle while thr0->join is blocking

Why would thr0->join block, when he has tested thr0->is_joinable?

$thr->is_joinable() Returns true if the thread has finished running, is not detached and has not yet been joined. In other words, the thread is ready to be joined, and a call to $thr->join() will not block.

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
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In the absence of evidence, opinion is indistinguishable from prejudice.
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In reply to Re^2: wait for threads to end in parallel by BrowserUk
in thread wait for threads to end in parallel by pmarcoen

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