| Safe Haskell | Safe-Infered |
|---|
Ganeti.Query.Exec
Description
Executing jobs as processes
The protocol works as follows (MP = master process, FP = forked process):
- MP sets its own livelock as the livelock of the job to be executed.
- FP creates its own lock file and sends its name to the MP.
- MP updates the lock file name in the job file and confirms the FP it can start.
- FP calls
executeFileand replaces the process with a Python process - FP sends an empty message to the MP to signal it's ready to receive the necessary information.
- MP sends the FP its job ID.
- FP sends an empty message to the MP again.
- MP sends the FP its live lock file name (since it was known only to the Haskell process, but not the Python process).
- Both MP and FP close the communication channel.
- isForkSupported :: IO Bool
- connectConfig :: ConnectConfig
- listOpenFds :: Error e => ResultT e IO [Fd]
- rethrowAnnotateIOError :: String -> IO a -> IO a
- runJobProcess :: JobId -> Client -> IO ()
- forkWithPipe :: ConnectConfig -> (Client -> IO ()) -> IO (ProcessID, Client)
- forkJobProcess :: (Error e, Show e) => JobId -> FilePath -> (FilePath -> ResultT e IO ()) -> ResultT e IO (FilePath, ProcessID)
Documentation
isForkSupported :: IO BoolSource
listOpenFds :: Error e => ResultT e IO [Fd]Source
rethrowAnnotateIOError :: String -> IO a -> IO aSource
runJobProcess :: JobId -> Client -> IO ()Source
forkWithPipe :: ConnectConfig -> (Client -> IO ()) -> IO (ProcessID, Client)Source
Arguments
| :: (Error e, Show e) | |
| => JobId | a job to process |
| -> FilePath | the daemons own livelock file |
| -> (FilePath -> ResultT e IO ()) | a callback function to update the livelock file and process id in the job file |
| -> ResultT e IO (FilePath, ProcessID) |
Forks the job process and starts processing of the given job. Returns the livelock of the job and its process ID.