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NNTP-Posting-Date: Thu, 02 Jun 2011 16:43:27 -0500
Date: Thu, 02 Jun 2011 14:43:32 -0700
From: Patricia Shanahan <pats@acm.org>
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Subject: Re: Making one or more threads wait for another to produce a value or fail
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On 6/2/2011 2:10 PM, markspace wrote:
> On 5/31/2011 7:00 AM, Tom Anderson wrote:
>> The scenario:
>>
>> Penelope is a widow, or at least her husband isn't around any more
>> (she's not sure which; long story). There are 108 suitors who would like
>> to marry her. She hasn't decided which one she'll marry. So, the 108
>> suitors are sitting about waiting for her to decide. It's possible that
>> instead of deciding to marry one of them, she'll deliver some other,
>> exceptional, verdict (eg "turns out my husband is still alive, and will
>> now murder you all").
>
>
> Just popping in quickly. First, everyone's all about CountDownLatch.
> Does this really work? It requires a fixed number of threads supplied on
> creation to "fire," iirc.

In this case, we expect exactly one event, Penelope's announcement of
either a choice of suitor or an exception such as "Husband returned
home.", so the initial count would be 1.

Patricia