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System.Posix.Semaphore | Portability | non-portable (requires POSIX) | Stability | experimental | Maintainer | libraries@haskell.org |
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Description |
POSIX named semaphore support.
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Synopsis |
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Documentation |
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Constructors | OpenSemFlags | | 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.
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Open a named semaphore with the given name, flags, mode, and initial
value.
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Delete the semaphore with the given name.
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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.
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Attempt to lock the semaphore without blocking. Immediately return
False if it is not available.
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Poll the semaphore until it is available, then lock it. Unlike
semWait, this will block only the current thread rather than the
entire process.
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Unlock the semaphore.
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Return the semaphore's current value.
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Produced by Haddock version 2.6.1 |