---
title: "#concurrency Code Snippets"
lang: "en"
author: "Mohammad Abu Mattar"
canonical: https://mkabumattar.com/tags/concurrency
---

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# #Concurrency

[Home](/)›[All Snippets](/codesnippets)›[All Tags](/codesnippets/tags)›[Concurrency](/codesnippets/tags/concurrency)

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# #Concurrency

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[![Bash Script Locking: Prevent Concurrent Runs with a PID File](/_astro/hero.CF-paSMK_vzFHW.webp)](/codesnippets/post/bash-script-locking-pid-file)

## [Bash Script Locking: Prevent Concurrent Runs with a PID File](/codesnippets/post/bash-script-locking-pid-file)

-   [Bash](/codesnippets/categories/bash)
-   [Automation](/codesnippets/categories/automation)
-   18 Aug 2026
-   04 Mins read

Quick Tip Wrap any script that must not run twice at once in a PID-file lock, and a second copy simply exits instead of corrupting your data. The Problem The Problem Cron does not c

[#Bash](/codesnippets/tags/bash)[#Pid file](/codesnippets/tags/pid-file)[#Locking](/codesnippets/tags/locking)+3 tags

[Bash](/codesnippets/bash)

[View Code](/codesnippets/post/bash-script-locking-pid-file)

[![Python Async HTTP Requests with aiohttp: Fetch Multiple URLs Concurrently](/_astro/hero.DFXqyT8a_Zqhl7o.webp)](/codesnippets/post/python-async-http-aiohttp-concurrent-requests)

## [Python Async HTTP Requests with aiohttp: Fetch Multiple URLs Concurrently](/codesnippets/post/python-async-http-aiohttp-concurrent-requests)

-   [Python](/codesnippets/categories/python)
-   [Async](/codesnippets/categories/async)
-   26 Jul 2026
-   05 Mins read

Quick Tip Reuse one aiohttp session, fan your requests out with asyncio.gather, and cap them with a semaphore to fetch hundreds of URLs in the time one loop would take. The Problem \*\*The

[#Python](/codesnippets/tags/python)[#Aiohttp](/codesnippets/tags/aiohttp)[#Asyncio](/codesnippets/tags/asyncio)+3 tags

[Python](/codesnippets/python)

[View Code](/codesnippets/post/python-async-http-aiohttp-concurrent-requests)