This is a discussion on the technical merits of coroutines and sender-receiver pipelines for high-frequency trading and finance. Vinnie Falco presented issues with coroutine-based IO, highlighting problems like allocator timing, error handling, and the need for a recycling allocator. Deitmar Kuhl argued that sender-receiver pipelines offer better performance and compile-time guarantees. Ville and others emphasized the importance of avoiding allocations and exceptions. The group debated the relevance of past consensus and the need for new evidence to revisit decisions. The meeting concluded with a commitment to further discussions on mailing lists. The meeting discussed the integration of  tasks and the need for further iteration on open design questions.  The group debated the three-channel completion model's ability to handle complicated success outcomes, with Ian arguing for API design solutions and Vinnie highlighting the need for deferral due to unresolved issues. A vote revealed no clear consensus, with eight strongly in favor, two weakly in favor, zero neutral, two weakly against, and seven strongly against. The importance of using the reflector for expert input was stressed.

Action Items

• Write up and post the detailed critique/analysis of the coroutine vs. senders concerns discussed (including the points raised in this meeting) to the LEWG/mailing list for follow-up discussion

Outline

Technical Meeting Setup and Agenda Overview

• Michael Wong introduces Brian as his co-chair and finance sub-chair, emphasizing the need for procedural and technical precision.
• Michael warns attendees that the meeting will focus on technical merits, not relitigation, and apologizes for any missed attendees.
• The agenda includes code of conduct, patent policies, and a roll call due to the large number of attendees.
• Michael adopts the agenda without objections and notes the absence of action items from the previous meeting.

2026 Planning and WG 21 Face-to-Face Meeting

• Michael outlines the 2026 planning, including a meeting in Croydon in two weeks to finalize the C 26 and triage remaining national body comments.
• The WG 21 face-to-face meeting will inform but not finalize SG 14's position, emphasizing SG 14's role in providing a low latency and finance domain perspective.
• Michael invites questions about logistics and planning before moving to the main paper discussion.
• Speaker 5 suggests taking minutes, and Michael assigns the task to Mark, who agrees to take notes.

Remaining Notes taken by Mark Hoemann is attached as pdf, thank you Mark.