Metered concurrency: Difference between revisions
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{{libheader|Wren-queue}}
In Wren, only one fiber can be run at a time but can yield control to another fiber and be resumed later. Also other tasks can be scheduled to run when a fiber is suspended by its sleep method. The following script (with 6 tasks) therefore takes just over 4 seconds to run rather than 12.
<syntaxhighlight lang="
import "timer" for Timer
import "./queue" for Queue
class CountingSemaphore {
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