facebook/folly
Nov 2024 – Feb 2025
2 Months active
Languages Used
C++
Technical Skills
ConcurrencyMemory ManagementMultithreadingTestingAsynchronous ProgrammingC++ Coroutines
David Geraghty (SEA)
PROFILE
David Geraghty (sea)
Over a two-month period, this developer contributed to the facebook/folly repository by enhancing concurrency primitives and extending coroutine queue functionality in C++. Their work included resolving a thread safety issue in Semaphore::signalSlow by adjusting atomic memory ordering, which improved synchronization reliability under high contention without altering the public API. Additionally, they implemented a timed dequeue feature for coroutine-based queues, introducing the co_try_dequeue_for API to support safe, timeout-aware operations. Both efforts demonstrated a strong focus on concurrency, asynchronous programming, and robust testing practices, resulting in improved internal stability and reliability for folly’s synchronization and queue components in multithreaded environments.
Overall Statistics
Feature vs Bugs
50%Features
Repository Contributions
2Total
Bugs
1
Commits
2
Features
1
Lines of code
184
Activity Months2
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Work History
February 2025
1 Commits • 1 Features
Feb 1, 2025February 2025 monthly summary focusing on key accomplishments for facebook/folly. The standout delivery this month is the timed dequeue feature for coroutine queue APIs, enabling safe, timed dequeues and reducing errors when combining with timeout/cancellation logic. This work is complemented by solid test coverage and a clear commit that implements the API for coro queues.
1 Commits • 1 Features
Feb 1, 2025February 2025 monthly summary focusing on key accomplishments for facebook/folly. The standout delivery this month is the timed dequeue feature for coroutine queue APIs, enabling safe, timed dequeues and reducing errors when combining with timeout/cancellation logic. This work is complemented by solid test coverage and a clear commit that implements the API for coro queues.
February 2025
November 2024
1 Commits
Nov 1, 2024Monthly summary for 2024-11: Hardening folly's concurrency primitives. Primary effort fixed a TSAN-detected race in Semaphore::signalSlow by changing atomic memory order from relaxed to release when the wait list is empty, ensuring token counts increment synchronizes with acquire loads in wait(). This change improves correctness and reliability of thread synchronization under high contention. No public API changes; internal stability improvements to folly's Semaphore primitive.
November 2024
1 Commits
Nov 1, 2024Monthly summary for 2024-11: Hardening folly's concurrency primitives. Primary effort fixed a TSAN-detected race in Semaphore::signalSlow by changing atomic memory order from relaxed to release when the wait list is empty, ensuring token counts increment synchronizes with acquire loads in wait(). This change improves correctness and reliability of thread synchronization under high contention. No public API changes; internal stability improvements to folly's Semaphore primitive.
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Quality Metrics
Correctness100.0%
Maintainability100.0%
Architecture100.0%
Performance100.0%
AI Usage20.0%
Skills & Technologies
Programming Languages
C++
Technical Skills
Asynchronous ProgrammingC++ CoroutinesConcurrencyMemory ManagementMultithreadingTesting
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