GI.GLib.Structs.Once

A #GOnce struct controls a one-time initialization function. Any one-time initialization function must have its own unique #GOnce struct.

Exported types

newtype Once

Constructors

Once (ForeignPtr Once)

Instances

((~) * info (ResolveOnceMethod t Once), MethodInfo * info Once p) => IsLabel t (Once -> p)

Methods

fromLabel :: Proxy# Symbol t -> Once -> p

((~) * info (ResolveOnceMethod t Once), MethodInfo * info Once p) => IsLabelProxy t (Once -> p)

Methods

fromLabelProxy :: Proxy Symbol t -> Once -> p

newZeroOnce :: MonadIO m => m Once

Construct a Once struct initialized to zero.

noOnce :: Maybe Once

Methods

onceInitEnter

onceInitEnter :: MonadIO m => Ptr () -> m Bool

onceInitLeave

onceInitLeave :: MonadIO m => Ptr () -> Word64 -> m ()

Properties

Retval

onceReadRetval :: Once -> IO (Ptr ())

Status

onceReadStatus :: Once -> IO OnceStatus