Events: Difference between revisions

=={{header|Wren}}==

Wren-cli supports the scheduling of tasks using a timer.

The tasks to be executed are added to a list by the Scheduler class. The Timer.sleep method suspends the current fiber and signals the scheduler (by calling a private method) to execute the tasks one by one in their own fibers - in Wren only one fiber can execute at a time. The task results are then available to the main fiber on its resumption after Timer.sleep has completed.

<lang ecmascript>import "scheduler" for Scheduler

import "timer" for Timer

var a = 3

// add a task

Scheduler.add {

a = a * a

}

// add another task

Scheduler.add {

a = a + 1

}

System.print(a) // still 3

Timer.sleep(3000) // wait 3 seconds

System.print(a) // now 3 * 3 + 1 = 10</lang>

{{out}}

<pre>

3

10

</pre>