'swift 4.0 dispatch_semaphore_wait with DISPATCH_TIME_FOREVER

dispatch_semaphore_wait(writeSemaphore!, DISPATCH_TIME_FOREVER)

gives error for DISPATCH_TIME_FOREVER i.e.

Cannot convert value of type 'Int' to expected argument type 'dispatch_time_t' (aka 'UInt64')

Een assigning a value DispatchTime.distantFuture could not help.

Can any one let me know what could be the value of dispatch_time_t(timeout)

Solution 1:^[1]

I'll go for:

    writeSemaphore!.wait(timeout: .distantFuture)

But you should improve you code, by making sure your optional isn't nil. Go for a guard as follows:

    guard let writeSemaphore = writeSemaphore else { return }

    writeSemaphore.wait(timeout: .distantFuture)

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Solution	Source
Solution 1	StÃ©phane de Luca