/usr/lib/hugs/packages/base/Control/Parallel.hs is in libhugs-base-bundled 98.200609.21-5.4.
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-- |
-- Module : Control.Parallel
-- Copyright : (c) The University of Glasgow 2001
-- License : BSD-style (see the file libraries/base/LICENSE)
--
-- Maintainer : libraries@haskell.org
-- Stability : experimental
-- Portability : non-portable
--
-- Parallel Constructs
--
-----------------------------------------------------------------------------
module Control.Parallel (
par, seq -- re-exported
) where
import Prelude
-- Maybe parIO and the like could be added here later.
-- | Indicates that it may be beneficial to evaluate the first
-- argument in parallel with the second. Returns the value of the
-- second argument.
--
-- @a `par` b@ is exactly equivalent semantically to @b@.
--
-- @par@ is generally used when the value of @a@ is likely to be
-- required later, but not immediately. Also it is a good idea to
-- ensure that @a@ is not a trivial computation, otherwise the cost of
-- spawning it in parallel overshadows the benefits obtained by
-- running it in parallel.
--
-- Note that actual parallelism is only supported by certain
-- implementations (GHC with the @-threaded@ option, and GPH, for
-- now). On other implementations, @par a b = b@.
--
par :: a -> b -> b
-- For now, Hugs does not support par properly.
par a b = b
|