cond_signal wakes an arbitrary thread that's waiting on the argument, not the thread specified by the argument.

If you wanted to use cond_signal, you'd have to replace 

        cond_wait ($baton) until $baton == $id;

[download]

with 

        for (;;) {
           cond_wait ($baton);
           last if $baton == $id;
           # This isn't the right sprinter, so try another.
           cond_signal ($baton);
        }

[download]

I don't know which approach is better.

In reply to Re: baton passing threads and cond_signal by ikegami
in thread baton passing threads and cond_signal by Anonymous Monk

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