--
-----------------------------------------------------------------------------
-#include "ghcconfig.h"
+-- No: #hide, because bits of this module are exposed by the stm package.
+-- However, we don't want this module to be the home location for the
+-- bits it exports, we'd rather have Control.Concurrent and the other
+-- higher level modules be the home. Hence:
+
+-- #not-home
module GHC.Conc
( ThreadId(..)
, writeTVar -- :: a -> TVar a -> STM ()
, unsafeIOToSTM -- :: IO a -> STM a
-#ifdef mingw32_TARGET_OS
+#ifdef mingw32_HOST_OS
, asyncRead -- :: Int -> Int -> Int -> Ptr a -> IO (Int, Int)
, asyncWrite -- :: Int -> Int -> Int -> Ptr a -> IO (Int, Int)
, asyncDoProc -- :: FunPtr (Ptr a -> IO Int) -> Ptr a -> IO Int
, asyncReadBA -- :: Int -> Int -> Int -> Int -> MutableByteArray# RealWorld -> IO (Int, Int)
, asyncWriteBA -- :: Int -> Int -> Int -> Int -> MutableByteArray# RealWorld -> IO (Int, Int)
#endif
+
+#ifndef mingw32_HOST_OS
+ , ensureIOManagerIsRunning
+#endif
) where
import System.Posix.Types
import GHC.Ptr ( Ptr(..), plusPtr, FunPtr(..) )
import GHC.STRef
import Data.Typeable
-#include "Typeable.h"
infixr 0 `par`, `pseq`
\end{code}
%************************************************************************
\begin{code}
-data ThreadId = ThreadId ThreadId#
+data ThreadId = ThreadId ThreadId# deriving( Typeable )
-- ToDo: data ThreadId = ThreadId (Weak ThreadId#)
-- But since ThreadId# is unlifted, the Weak type must use open
-- type variables.
it defines 'ThreadId' as a synonym for ().
-}
-INSTANCE_TYPEABLE0(ThreadId,threadIdTc,"ThreadId")
-
-
--forkIO has now been hoisted out into the Concurrent library.
{- | 'killThread' terminates the given thread (GHC only).
thread has received the exception. This is a useful property to know
when dealing with race conditions: eg. if there are two threads that
can kill each other, it is guaranteed that only one of the threads
-will get to kill the other. -}
+will get to kill the other.
+
+If the target thread is currently making a foreign call, then the
+exception will not be raised (and hence 'throwTo' will not return)
+until the call has completed. This is the case regardless of whether
+the call is inside a 'block' or not.
+ -}
throwTo :: ThreadId -> Exception -> IO ()
throwTo (ThreadId id) ex = IO $ \ s ->
case (killThread# id ex s) of s1 -> (# s1, () #)
transactions.
\begin{code}
-newtype STM a = STM (State# RealWorld -> (# State# RealWorld, a #))
-
-INSTANCE_TYPEABLE1(STM,stmTc,"STM" )
+newtype STM a = STM (State# RealWorld -> (# State# RealWorld, a #)) deriving( Typeable )
unSTM :: STM a -> (State# RealWorld -> (# State# RealWorld, a #))
unSTM (STM a) = a
catchSTM :: STM a -> (Exception -> STM a) -> STM a
catchSTM (STM m) k = STM $ \s -> catchSTM# m (\ex -> unSTM (k ex)) s
-data TVar a = TVar (TVar# RealWorld a)
-
-INSTANCE_TYPEABLE1(TVar,tvarTc,"TVar" )
+data TVar a = TVar (TVar# RealWorld a) deriving( Typeable )
instance Eq (TVar a) where
(TVar tvar1#) == (TVar tvar2#) = sameTVar# tvar1# tvar2#
\begin{code}
--Defined in IOBase to avoid cycle: data MVar a = MVar (SynchVar# RealWorld a)
-INSTANCE_TYPEABLE1(MVar,mvarTc,"MVar" )
-
-- |Create an 'MVar' which is initially empty.
newEmptyMVar :: IO (MVar a)
newEmptyMVar = IO $ \ s# ->
%************************************************************************
\begin{code}
-#ifdef mingw32_TARGET_OS
+#ifdef mingw32_HOST_OS
-- Note: threadDelay, threadWaitRead and threadWaitWrite aren't really functional
-- on Win32, but left in there because lib code (still) uses them (the manner
-- in which they're used doesn't cause problems on a Win32 platform though.)
asyncRead :: Int -> Int -> Int -> Ptr a -> IO (Int, Int)
-asyncRead (I# fd) (I# isSock) (I# len) (Ptr buf) = do
- (l, rc) <- IO (\s -> case asyncRead# fd isSock len buf s of
- (# s, len#, err# #) -> (# s, (I# len#, I# err#) #))
- -- special handling for Ctrl+C-aborted 'standard input' reads;
- -- see rts/win32/ConsoleHandler.c for details.
- if (l == 0 && rc == -2)
- then asyncRead (I# fd) (I# isSock) (I# len) (Ptr buf)
- else return (l,rc)
+asyncRead (I# fd) (I# isSock) (I# len) (Ptr buf) =
+ IO $ \s -> case asyncRead# fd isSock len buf s of
+ (# s, len#, err# #) -> (# s, (I# len#, I# err#) #)
asyncWrite :: Int -> Int -> Int -> Ptr a -> IO (Int, Int)
-asyncWrite (I# fd) (I# isSock) (I# len) (Ptr buf) =
- IO $ \s -> case asyncWrite# fd isSock len buf s of
+asyncWrite (I# fd) (I# isSock) (I# len) (Ptr buf) =
+ IO $ \s -> case asyncWrite# fd isSock len buf s of
(# s, len#, err# #) -> (# s, (I# len#, I# err#) #)
asyncDoProc :: FunPtr (Ptr a -> IO Int) -> Ptr a -> IO Int
-- given file descriptor (GHC only).
threadWaitRead :: Fd -> IO ()
threadWaitRead fd
-#ifndef mingw32_TARGET_OS
+#ifndef mingw32_HOST_OS
| threaded = waitForReadEvent fd
#endif
| otherwise = IO $ \s ->
-- given file descriptor (GHC only).
threadWaitWrite :: Fd -> IO ()
threadWaitWrite fd
-#ifndef mingw32_TARGET_OS
+#ifndef mingw32_HOST_OS
| threaded = waitForWriteEvent fd
#endif
| otherwise = IO $ \s ->
--
threadDelay :: Int -> IO ()
threadDelay time
-#ifndef mingw32_TARGET_OS
+#ifndef mingw32_HOST_OS
| threaded = waitForDelayEvent time
#else
| threaded = c_Sleep (fromIntegral (time `quot` 1000))
}}
-- On Windows, we just make a safe call to 'Sleep' to implement threadDelay.
-#ifdef mingw32_TARGET_OS
-foreign import ccall safe "Sleep" c_Sleep :: CInt -> IO ()
+#ifdef mingw32_HOST_OS
+foreign import stdcall safe "Sleep" c_Sleep :: CInt -> IO ()
#endif
foreign import ccall unsafe "rtsSupportsBoundThreads" threaded :: Bool
-- - forkProcess will kill the IO manager thread. Let's just
-- hope we don't need to do any blocking IO between fork & exec.
-#ifndef mingw32_TARGET_OS
+#ifndef mingw32_HOST_OS
data IOReq
= Read {-# UNPACK #-} !Fd {-# UNPACK #-} !(MVar ())
{-# NOINLINE pendingEvents #-}
{-# NOINLINE pendingDelays #-}
(pendingEvents,pendingDelays) = unsafePerformIO $ do
- startIOServiceThread
+ startIOManagerThread
reqs <- newIORef []
dels <- newIORef []
return (reqs, dels)
-- the first time we schedule an IO request, the service thread
-- will be created (cool, huh?)
-startIOServiceThread :: IO ()
-startIOServiceThread = do
+ensureIOManagerIsRunning :: IO ()
+ensureIOManagerIsRunning
+ | threaded = seq pendingEvents $ return ()
+ | otherwise = return ()
+
+startIOManagerThread :: IO ()
+startIOManagerThread = do
allocaArray 2 $ \fds -> do
- throwErrnoIfMinus1 "startIOServiceThread" (c_pipe fds)
+ throwErrnoIfMinus1 "startIOManagerThread" (c_pipe fds)
rd_end <- peekElemOff fds 0
wr_end <- peekElemOff fds 1
writeIORef stick (fromIntegral wr_end)
+ c_setIOManagerPipe wr_end
quickForkIO $ do
allocaBytes sizeofFdSet $ \readfds -> do
allocaBytes sizeofFdSet $ \writefds -> do
fdSet wakeup readfds
maxfd <- buildFdSets 0 readfds writefds reqs
- -- check the current time and wake up any thread in threadDelay whose
- -- timeout has expired. Also find the timeout value for the select() call.
- now <- getTicksOfDay
- (delays', timeout) <- getDelay now ptimeval delays
-
-- perform the select()
- let do_select = do
+ let do_select delays = do
+ -- check the current time and wake up any thread in
+ -- threadDelay whose timeout has expired. Also find the
+ -- timeout value for the select() call.
+ now <- getTicksOfDay
+ (delays', timeout) <- getDelay now ptimeval delays
+
res <- c_select ((max wakeup maxfd)+1) readfds writefds
nullPtr timeout
if (res == -1)
then do
err <- getErrno
if err == eINTR
- then do_select
- else return res
+ then do_select delays'
+ else return (res,delays')
else
- return res
- res <- do_select
+ return (res,delays')
+
+ (res,delays') <- do_select delays
-- ToDo: check result
- b <- takeMVar prodding
- if b then alloca $ \p -> do c_read (fromIntegral wakeup) p 1; return ()
- else return ()
+ b <- fdIsSet wakeup readfds
+ if b == 0
+ then return ()
+ else alloca $ \p -> do
+ c_read (fromIntegral wakeup) p 1; return ()
+ s <- peek p
+ if (s == 0xff)
+ then return ()
+ else do sp <- peekElemOff handlers (fromIntegral s)
+ quickForkIO (deRefStablePtr sp)
+ return ()
+
+ takeMVar prodding
putMVar prodding False
reqs' <- completeRequests reqs readfds writefds []
b <- takeMVar prodding
if (not b)
then do fd <- readIORef stick
- with 42 $ \pbuf -> do c_write (fromIntegral fd) pbuf 1; return ()
+ with 0xff $ \pbuf -> do c_write (fromIntegral fd) pbuf 1; return ()
else return ()
putMVar prodding True
+foreign import ccall "&signal_handlers" handlers :: Ptr (StablePtr (IO ()))
+
+foreign import ccall "setIOManagerPipe"
+ c_setIOManagerPipe :: CInt -> IO ()
+
-- -----------------------------------------------------------------------------
-- IO requests
projects / ghc-base.git / blobdiff