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Randal L. SchwartzSep 20, 2026 • 6 min read
Share State Across Dart Isolates Without Losing Your Mind: Enter shared_map
How to bypass tedious SendPort/ReceivePort plumbing and share synchronized in-memory state across Da...
#dart#flutter#architecture#concurrency
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Jishnu SahaSep 19, 2026 • 19 min read
How Does a Database Let Everyone Read and Write at Once?
In the previous post we dug into how a database physically stores your rows — pages, slotted pages,....
#database#postgres#concurrency#jishnusaha
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Nikhil KamaniSep 19, 2026 • 4 min read
From Thread Pools to Virtual Threads: How Spring Boot on Java 21 Scales in Production
Layoffs, hiring freezes, uncertainty—that’s the current vibe. So I decided to revisit basics. While ...
#java#springboot#performance#concurrency
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Rohit KoriSep 20, 2026 • 11 min read
Java Concurrency & Multithreading: 40 Interview Questions
1. Process vs Thread A process has its own memory space and OS resources; threads live...
#programming#java#multithreading#concurrency
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Anthony GarcesSep 25, 2026 • 7 min read
The Watchdog That Would Have Passed Every Test and Hung Anyway
TL;DR: A watchdog fixes a stall only when timeout errors are terminal and non-retryable; idle and...
#concurrency#flakytests#testdesign
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jamilxtSep 23, 2026 • 8 min read
Java Finally Killed Double-Checked Locking. The Code Proves It.
Somewhere in the codebase you work on right now, there is almost certainly a field like...
#java#jvm#concurrency#performance
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Morgan MaSep 23, 2026 • 6 min read
The CAS Succeeded on a Recycled Generation
The lock-free path failed on reuse, not enqueue. Pointer-only CAS cannot see a recycled node. I trea...
#cpp#debugging#testing#concurrency
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RONI DASSep 25, 2026 • 5 min read
Blinkit System Design: Selling the Last Packet of Milk Exactly Once
2,443 dark stores, per-store inventory, a race-tested reservation, stock that goes missing, and chan...
#systemdesign#database#concurrency#architecture
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RONI DASSep 25, 2026 • 4 min read
Two People Tap Seat 14 at Once: Designing redBus Seat Locks
Seat holds with an expiry, the race tested on PostgreSQL, paying after the hold ends, and one seat s...
#systemdesign#concurrency#database#interview
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ItsEvilDuckSep 24, 2026 • 1 min read
Demonstrating Python's multiprocessing.Pool worker limits
I built multiprocessing-pool-demo because understanding how Python's multiprocessing.Pool manages...
#python#multiprocessing#concurrency#developertools
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