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authorJoey Hess2016-04-05 13:26:42 -0400
committerJoey Hess2016-04-05 13:26:42 -0400
commit4332d4e54c417cd4edb0a1f37dc5ad97ce706048 (patch)
treefbba88b786f10b9306f909679ece4128a81924e7 /src/System/Process/Concurrent.hs
parentf093568d9156e551071a0ad2583a03307b717aa2 (diff)
propellor spin
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+-- |
+-- Copyright: 2015 Joey Hess <id@joeyh.name>
+-- License: BSD-2-clause
+--
+-- The functions exported by this module are intended to be drop-in
+-- replacements for those from System.Process, when converting a whole
+-- program to use System.Console.Concurrent.
+
+module System.Process.Concurrent where
+
+import System.Console.Concurrent
+import System.Console.Concurrent.Internal (ConcurrentProcessHandle(..))
+import System.Process hiding (createProcess, waitForProcess)
+import System.IO
+import System.Exit
+
+-- | Calls `createProcessConcurrent`
+--
+-- You should use the waitForProcess in this module on the resulting
+-- ProcessHandle. Using System.Process.waitForProcess instead can have
+-- mildly unexpected results.
+createProcess :: CreateProcess -> IO (Maybe Handle, Maybe Handle, Maybe Handle, ProcessHandle)
+createProcess p = do
+ (i, o, e, ConcurrentProcessHandle h) <- createProcessConcurrent p
+ return (i, o, e, h)
+
+-- | Calls `waitForProcessConcurrent`
+--
+-- You should only use this on a ProcessHandle obtained by calling
+-- createProcess from this module. Using this with a ProcessHandle
+-- obtained from System.Process.createProcess etc will have extremely
+-- unexpected results; it can wait a very long time before returning.
+waitForProcess :: ProcessHandle -> IO ExitCode
+waitForProcess = waitForProcessConcurrent . ConcurrentProcessHandle