> In my application, I need a thread to wait on another
> thread to send a cond_signal. Easy enough, but if the
> second thread hasn't reached the cond_wait by the time the
> cond_signal appears, then the signal is discarded and the
> cond_wait will end up blocking forever.
You can't just rely on the locking. You need to deal with a
flag value sent in the shared variable:
my $flag :shared = 0;
sub thr1
{
...
{
lock($flag);
$flag++;
cond_signal($flag);
}
}
sub thr2
{
...
{
lock($flag);
while(! $flag) {
cond_wait($flag);
}
}
...
}
Hope that helps.
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