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World Congress 2023 • Sep 27, 2023

Coroutine explained yet again 60 years later

Mikhail Maslo

Why is a 60-year-old compiler concept driving modern concurrency? Discover how stackless coroutines transform messy callbacks into clean, highly scalable async flows.

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#1 about 2 min

Introduction to coroutines and their historical origins

Melvin Conway's initial work on co-compilers demonstrates how historical computing solutions established foundations for modern coroutines.

#2 about 3 min

Execution flow and suspending states in coroutines

Comparing regular functions to suspendable routines reveals how saving internal states enables advanced execution flows.

#3 about 5 min

Under the hood of coroutines with state machines

Translating complex coroutine execution into underlying compiler state machines provides a reliable mechanism for managing resumption.

#4 about 5 min

Differences between stackful and stackless coroutine classifications

Comparing stack reliance shows that stackful routines permit deep suspensions while stackless models minimize memory overhead.

#5 about 6 min

Symmetric versus asymmetric control transfers in coroutines

Analyzing yield behaviors illustrates how asymmetric models simplify caller relationships compared to arbitrary symmetric control transfers.

#6 about 2 min

Performance and memory tradeoffs among coroutine classifications

Evaluating varied coroutine structures guides developers in balancing execution speed with strict memory footprint constraints.

#7 about 6 min

Positioning coroutines within hardware and software thread hierarchies

Positioning routines against kernel resources clarifies how cooperative user-level threads avoid intensive operating system scheduling overhead.

#8 about 5 min

Implementing cooperative multitasking in modern programming languages

Applying asynchronous markers to heavy concurrency workloads replaces nested callback structures with linear readable code sequences.

#9 about 2 min

Audience questions on language support for async programming

Addressing language disparities emphasizes how coroutine support fundamentally accelerates modern asynchronous development workflows.

Matching moments

3:26 min

Simplifying asynchronous concurrency patterns safely with coroutines logic

Urs Peter · World Congress 2022

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Compiler state machines and asynchronous concurrent task execution

Grzegorz Lang · World Congress 2022

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Handling asynchronous operations with native Kotlin coroutines

Georg Dresler Georg Dresler · World Congress 2026 Europe

4:35 min

Orchestrating concurrent routines with channels and goroutines

Frank Müller · World Congress 2021

2:28 min

Adding strong type checking and generic programming concepts

Bjarne Stroustrup · World Congress 2022

1:11 min

Origins of Project Loom and lightweight threading semantics

Ivan Šarić Ivan Šarić · Europe 2026 Virtual

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