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  • #9379

Closed
Open
Opened Jul 29, 2014 by Feuerbach@trac-Feuerbach

Blocked STM transaction is not interruptible

import Control.Exception
import Control.Concurrent
import Control.Concurrent.STM
import Foreign.StablePtr

main :: IO ()
main = do
  tv <- atomically $ newTVar True
  _ <- newStablePtr tv
  t <- mask_ $ forkIO (blockSTM tv)
  killThread t

blockSTM :: TVar Bool -> IO ()
blockSTM tv = do
  atomically $ do
    v <- readTVar tv
    check $ not v

This code blocks forever. As I understand it, since the transaction blocks, it should be interruptible even despite the mask, and so killThread must succeed here, and the program should finish promptly.

Trac metadata
Trac field Value
Version 7.8.3
Type Bug
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component Runtime System
Test case
Differential revisions
BlockedBy
Related
Blocking
CC simonmar
Operating system
Architecture
Assignee
Assign to
7.8.4
Milestone
7.8.4 (Past due)
Assign milestone
Time tracking
None
Due date
None
Reference: ghc/ghc#9379