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Blocking interface rule

20080528 (2008 May 28 Wednesday)

Sometime a client wishes to block/wait on/for a service. Sometimes a client wishes to use many services at the same time. Some systems encourage threads as a work around but, threads are difficult, interthread communication is difficult.

Therefore: For all interfaces in a system that block, allow non exclusive blocking. i.e. A client can block on all interfaces at the same time, with a single command. e.g. wait_on([a,b,c,d])

You can use threads at io boundaries to help implement this.

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