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document equiv. of concurrently with n tasks #171

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document equiv. of concurrently with n tasks #171

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9 changes: 9 additions & 0 deletions Control/Concurrent/Async/Internal.hs
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Original file line number Diff line number Diff line change
Expand Up @@ -609,6 +609,9 @@ race_ ::
-- > withAsync left $ \a ->
-- > withAsync right $ \b ->
-- > waitBoth a b
--
-- To run more than two actions concurrently, refer to the documentation
-- of 'mapConcurrently'.
concurrently ::
CALLSTACK
IO a -> IO b -> IO (a,b)
Expand Down Expand Up @@ -764,6 +767,12 @@ concurrently_ left right = concurrently' left right (collect 0)
--
-- > pages <- mapConcurrently getURL ["url1", "url2", "url3"]
--
-- A list of tasks can also be given, to run more than two functions
-- 'concurrently':
--
-- > runAllConcurrently = mapConcurrently id
-- > results <- runAllConcurrently [fun1, fun2, fun3]
--
-- Take into account that @async@ will try to immediately spawn a thread
-- for each element of the @Traversable@, so running this on large
-- inputs without care may lead to resource exhaustion (of memory,
Expand Down