In each case, the composition waits for all processes to finish, either
successfully or with poison. At the end of this, if any process
exited with poison, the composition will rethrow this poison. If all
the processes completed successfully, the results will be returned. If
you want to ignore poison from the sub-processes, use an empty poison
onPoisonTrap with each branch.
Runs the given list of processes in parallel, and then returns a list of the results, in the same order as the processes given. Will only return when all the inner processes have completed.
Runs all the given processes in parallel and discards any output. Does
not return until all the processes have completed. runParallel_ ps is effectively equivalent
runParallel ps >> return ().
A useful operator for performing a two process equivalent of runParallel that gives the return values back as a pair rather than a list. This also allows the values to have different types
A monad transformer used for introducing forking blocks.
Executes a forking block. Processes may be forked off inside (using the
fork function). When the block completes, it waits for all the forked
off processes to complete before returning the output, as long as none of
the processes terminated with uncaught poison. If they did, the poison
is propagated (rethrown).
Forks off the given process. The process then runs in parallel with this code, until the end of the forking block, when all forked-off processes are waited for. At that point, once all of the processes have finished, if any of them threw poison it is propagated.