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Author:halw

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Date:2011-03-25T18:09:08.000000Z


git-svn-id: https://svn.eiffel.com/eiffel-org/trunk@859 abb3cda0-5349-4a8f-a601-0c33ac3a8c38
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halw
2011-03-25 20:32:31 +00:00
parent e4c7bc9683
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2 changed files with 59 additions and 9 deletions
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documentation/current/solutions/concurrent-computing/concurrent-eiffel-scoop/scoop-examples/single-element-producer-consumer.wiki
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@@ -19,7 +19,7 @@ The <code>PRODUCER</code> class supports a procedure <code>produce</code> in whi
The <code>CONSUMER</code> class works in a way that is largely the symmetrical opposite of <code>PRODUCER</code>. The consumer tries to <code>consume</code> the item from the <code>INVENTORY</code>. But this only possible if an item has been produced and is available. So <code>{CONSUMER}.consume</code> has a "wait" precondition based on the query <code>{INVENTORY}.has_item</code>.
So the heart of the problem is the synchronization between producer and consumer sharing a single inventory. If there's already a product in inventory, the producer cannot produce more and must wait. Only when the consumer consumes the current product can the producer produce again. For the consumer's part, if there's a product currently in inventory, then the consumer can consume that product. Otherwise, the consumer must wait until the producer produces a new product. The synchronization is handled by the SCOOP mechanism of wait preconditions on the inventory.
So the heart of the problem is the synchronization between producer and consumer sharing a single inventory. If there's already a product in inventory, the producer cannot produce more and must wait. Only when the consumer consumes the current product can the producer produce again. For the consumer's part, if there's a product currently in inventory, then the consumer can consume that product. Otherwise, the consumer must wait until the producer produces a new product. The synchronization is handled by the SCOOP mechanism of uncontrolled (wait) preconditions on the inventory.