DispatchSemaphore
used to restrict the concurrent access on shared resources. It pauses the thread using counter value. Is it possible to get that counter value?
Current count value of DispatchSemaphore
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You can print the
semaphore.debugDescription
or usedebugPrint
:Use this for diagnostic purposes, only, though. They deliberately did not expose this counter value as a property.
For what it is worth, I might advise against using semaphores to “restrict the concurrent access on shared resources.” Generally, we would prefer other patterns such as actors, locks, serial GCD queues, or the reader-writer pattern.
I also might advise against semaphores to “avoid the thread explosion.” Again, there are better, more contemporary patterns ranging from GCD’s
concurrentPerform
,OperationQueue
and itsmaxConcurrentOperationCount
, the cooperative thread pool of Swift concurrency, Combine’s “max publishers” pattern, etc. (FWIW, most of these patterns do not expose the “current count” either.)In short, many consider semaphores to be a bit of an anti-pattern, nowadays. But if you want to see the count,
debugPrint
(or explicitly accessing thedebugDescription
) will show you what’s going on.