https://github.com/ptsochantaris/semalot

An elementary counting semaphore for async tasks in Swift
https://github.com/ptsochantaris/semalot

concurrency ios macos swift threading

Last synced: 4 months ago
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An elementary counting semaphore for async tasks in Swift

• Host: GitHub
• URL: https://github.com/ptsochantaris/semalot
• Owner: ptsochantaris
• License: mit
• Created: 2023-08-08T22:43:08.000Z (almost 2 years ago)
• Default Branch: main
• Last Pushed: 2024-10-11T23:06:52.000Z (8 months ago)
• Last Synced: 2025-01-30T22:41:35.730Z (5 months ago)
• Topics: concurrency, ios, macos, swift, threading
• Language: Swift
• Homepage:
• Size: 26.4 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        


# Semalot

👨 "Semalot!" 👨‍🦱 "Semalot!!" 👴 "Semalot!!!" 🤦‍♀️ "It's only a counter…" 👨👨‍🦱👴 _"Shh!!!!"_

An elementary counting semaphore for async tasks in Swift, which I use a lot in my code so I thought I should turn it into a package!

[![](https://img.shields.io/endpoint?url=https%3A%2F%2Fswiftpackageindex.com%2Fapi%2Fpackages%2Fptsochantaris%2Fkey-vine%2Fbadge%3Ftype%3Dswift-versions)](https://swiftpackageindex.com/ptsochantaris/key-vine) [![](https://img.shields.io/endpoint?url=https%3A%2F%2Fswiftpackageindex.com%2Fapi%2Fpackages%2Fptsochantaris%2Fkey-vine%2Fbadge%3Ftype%3Dplatforms)](https://swiftpackageindex.com/ptsochantaris/key-vine)

Currently used in

- [Trailer](https://github.com/ptsochantaris/trailer)

- [Trailer-CLI](https://github.com/ptsochantaris/trailer-cli)

- [Gladys](https://github.com/ptsochantaris/gladys)

Detailed docs [can be found here](https://swiftpackageindex.com/ptsochantaris/semalot/documentation)

## Overview

Does what it says on the tin. It's simple and efficient, does not use any dispatch locks, and does not cause any Task queue congestion.

```

let maxConcurrentOperations = Semalot(tickets: 3)

try await withThrowingTaskGroup { group in

    for request in lotsOfRequests {

        await maxConcurrentOperations.takeTicket()

        group.addTask {

            let data = try await urlSession.data(for: request).0

            await doThings(with: data)

            maxConcurrentOperations.returnTicket()

        }

    }

}

```

## License

Copyright (c) 2023 Paul Tsochantaris. Licensed under the MIT License, see LICENSE for details.