The slave-thread package
Vanilla thread management in Haskell is low level and it does not approach the problems related to thread deaths. When it's used naively the following typical problems arise:
When a forked thread dies due to an uncaught exception, the exception does not get raised in the main thread, which is why the program continues to run as if nothing happened, i.e., with the presumption that the already dead thread is running normally. It does not need an explanation that this may bring your program to a chaotic state.
Another issue is that one thread dying does not affect any of the threads forked from it. That's why your program may be accumulating ghost threads.
Ever dealt with your program ignoring the <Ctrl-C> strikes?
This library solves all the issues above with a concept of a slave thread. A slave thread has the following properties:
When it dies for whatever reason (exception or finishing normally) it kills all the slave threads that were forked from it. This protects you from ghost threads.
It waits for all slaves to die and execute their finalizers before executing its own finalizer and getting released itself. This gives you hierarchical releasing of resources.
When a slave thread dies with an uncaught exception it reraises it in the parent thread. This protects you from silent exceptions. If your program is brought to an erroneous state you can be sure of getting informed.
|Versions||0.1.0, 0.1.1, 0.1.2, 0.1.3, 0.1.4, 0.1.5, 0.1.6, 18.104.22.168, 1.0.1, 22.214.171.124, 1.0.2|
|Dependencies||base (>=4.5 && <4.8), base-prelude (>=0.1.3 && <0.2), list-t (>=0.2.4 && <0.3), mmorph (>=1.0.4 && <1.1), partial-handler (>=0.1.0 && <0.2), stm-containers (>=0.2.0 && <0.3), transformers (>=0.3 && <0.5) [details]|
|Copyright||(c) 2014, Nikita Volkov|
|Author||Nikita Volkov <email@example.com>|
|Maintainer||Nikita Volkov <firstname.lastname@example.org>|
|Category||Concurrency, Concurrent, Error Handling, Exceptions, Failure|
|Source repository||head: git clone git://github.com/nikita-volkov/slave-thread.git|
|Uploaded||Sun Oct 19 04:21:19 UTC 2014 by NikitaVolkov|
|Distributions||LTSHaskell:1.0.2, NixOS:1.0.2, Tumbleweed:1.0.2|
|Downloads||2359 total (32 in the last 30 days)|
|Status||Docs uploaded by user
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