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Metered concurrency: Difference between revisions
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Dim oldCount = sem.Release() 'Returns a resource to the pool
'oldCount has the Semaphore's count before Release was called</lang>
=={{header|zkl}}==
Semaphores are built in.
<lang zkl>fcn job(name,sem){
name.println(" wait"); sem.acquire();
name.println(" go"); Atomic.sleep(2);
sem.release(); name.println(" done")
}
// start 3 threads using the same semphore
s:=Thread.Semaphore(1);
job.launch("1",s); job.launch("2",s); job.launch("3",s);</lang>
{{out}}
<pre>
2 wait
2 go
1 wait
3 wait
2 done
1 go
1 done
3 go
3 done
</pre>
{{omit from|TI-83 BASIC}} {{omit from|TI-89 BASIC}} <!-- Does not have concurrency or background processes. -->
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