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prevent threads not awaiting migration from blocking their response

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Trolli Schmittlauch 2020-08-17 11:37:04 +02:00
parent c49c1a89c9
commit b8cedada48
1 changed files with 6 additions and 4 deletions
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10
src/Hash2Pub/PostService.hs
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@ -232,10 +232,12 @@ subscriptionDelivery serv senderID subList = do
:: STM (Either String ()))
-- TODO: should this always signal migration finished to avoid deadlocksP
liftIO $ putMVar syncMVar () -- wakes up waiting thread
liftIO $ putMVar syncMVar () -- blocks until waiting thread has resumed
-- delete this migration from ongoing ones
liftIO . atomically $ modifyTVar' (migrationsInProgress serv) $
HMap.delete (fromInteger senderID)
-- allow response to be completed independently from waiting thread
_ <- liftIO . forkIO $ do
putMVar syncMVar () -- blocks until waiting thread has resumed
-- delete this migration from ongoing ones
liftIO . atomically $ modifyTVar' (migrationsInProgress serv) $
HMap.delete (fromInteger senderID)
case res of
Left err -> throwError err410 {errBody = BSUL.fromString err}
Right _ -> pure ""