|Portability||non-portable (requires POSIX)|
|POSIX named semaphore support.
|semCreate :: Bool||If true, create the semaphore if it
does not yet exist.
|semExclusive :: Bool||If true, throw an exception if the
semaphore already exists.
|Open a named semaphore with the given name, flags, mode, and initial
|Delete the semaphore with the given name.
|Lock the semaphore, blocking until it becomes available. Since this
is done through a system call, this will block the *entire runtime*,
not just the current thread. If this is not the behaviour you want,
use semThreadWait instead.
|Attempt to lock the semaphore without blocking. Immediately return
False if it is not available.
|Poll the semaphore until it is available, then lock it. Unlike
semWait, this will block only the current thread rather than the
|Unlock the semaphore.
|Return the semaphore's current value.
|Produced by Haddock version 2.6.0|