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Parallel and Concurrent Programming in Haskell
book

Parallel and Concurrent Programming in Haskell

by Simon Marlow
July 2013
Intermediate to advanced content levelIntermediate to advanced
322 pages
8h 43m
English
O'Reilly Media, Inc.
Content preview from Parallel and Concurrent Programming in Haskell

Chapter 15. Debugging, Tuning, and Interfacing with Foreign Code

Debugging Concurrent Programs

In this section, I’ve collected a few tricks and techniques that you might find useful when debugging Concurrent Haskell programs.

Inspecting the Status of a Thread

The threadStatus function (from GHC.Conc) returns the current state of a thread:

threadStatus :: ThreadId -> IO ThreadStatus

Here, ThreadStatus is defined as follows:

data ThreadStatus
  = ThreadRunning                    -- 1
  | ThreadFinished                   -- 2
  | ThreadBlocked  BlockReason       -- 3
  | ThreadDied                       -- 4
  deriving (Eq, Ord, Show)
1

The thread is currently running (or runnable).

2

The thread has finished.

3

The thread is blocked (the BlockReason type is explained shortly).

4

The ...

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Publisher Resources

ISBN: 9781449335939Supplemental ContentErrata Page