July 2013
Intermediate to advanced
322 pages
8h 43m
English
Content preview from Parallel and Concurrent Programming in HaskellBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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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->IOThreadStatus
Here, ThreadStatus is defined as follows:
dataThreadStatus=ThreadRunning--
|ThreadFinished--
|ThreadBlockedBlockReason--
|ThreadDied--
deriving(Eq,Ord,Show)
-
The thread is currently running (or runnable).
-
The thread has finished.
-
The thread is blocked (the
BlockReasontype is explained shortly).-
The ...
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