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Thread Delay (Grade A)Security-tested data-ai skill for Claude AI. Grade A. Avoid overusing threadDelay because time-dependent code is unstable and unportable. Prefer synchronization variables like TMVar or retry combinato

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Daniel NikulshynReviewed by Daniel Nikulshyn·Updated July 2026

Overview

Avoid overusing threadDelay because time-dependent code is unstable and unportable. Prefer synchronization variables like TMVar or retry combinators. Use when writing or reviewing Haskell code that delays threads, waits, or polls. This can be used intentionally for permanent thread stopping, for example, to prevent resources from being reclaimed by the GC. In tests, it may be used as a last resort when synchronisation variables are too complex, but using retry systems is generally recommended over threadDelay.

Key features

  • Thread delay functionality
  • Integration with Haskell code
  • Security testing

Pricing

Model
Free
Category
Skills
Rating
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Use cases

Testing

Thread Delay can be used in test code when logic requires a delay, but preferable alternatives should be considered.

Permanent Thread Stop

Thread Delay can be used to intentionally permanently stop a thread, holding onto resources.

Haskell Code Delay

Thread Delay can be used in Haskell code to introduce delays, waits, or polls, but its use is discouraged.

Pros & Cons

Pros

  • Allows for thread delays in Haskell code
  • Can be useful in certain test code scenarios
  • Can be used to intentionally permanently stop a thread

Cons

  • Time-dependent code is unstable and unportable
  • Can cause execution to stop for a specified time, leading to delays
  • Preferable alternatives exist, such as synchronization variables or retry combinators

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Q&A

Can Thread Delay be used to permanently stop a thread?

Yes, a long‑lived delay such as "forever threadDelay maxBound" can intentionally keep a thread alive and hold its resources for testing or specific scenarios.

Asked by Vikram Rao · Sep 28, 2025

What are better alternatives to threadDelay?

Prefer synchronization variables like TMVar or retry combinators (e.g., fullJitterBackoff, exponentialBackoff) for more reliable and adaptive waiting.

Asked by Renata Silva · Aug 27, 2025

When should I avoid using threadDelay?

Avoid it in production code because time-dependent delays are unstable, unportable, and can cause unpredictable execution times across machines.

Asked by Dara Fitzgerald · Aug 26, 2025

What does Thread Delay do in Haskell code?

Thread Delay provides a function that pauses a thread for a specified time, useful for intentional waiting, polling, or preventing GC from reclaiming resources.

Asked by Leila Hassan · Jul 25, 2025

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