ocaml-multicore/eio

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Effects-based direct-style IO for multicore OCaml

Stars: 724
Forks: 86
Open beginner issues: 0
Indexed issues: 42
Avg merge: 1d 14h
Merged PRs (30d): 8

Dominant language: OCaml
License: No license data
Last GitHub push: Sep 17, 2026
Latest indexed: Sep 20, 2026
Contributing guide: No contributing guide
Code of conduct: Code of conduct
Beginner labels: good first issue help wanted

Beginner friendly Everything

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42 open issues indexed

No way to create a hard link Open

ocaml-multicore/eio#925 · 1 comment · 1 reaction · 1 assignee · Opened Aug 20, 2026
No way to sync a directory Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

ocaml-multicore/eio#912 · 1 comment · Opened Jul 30, 2026
Pty raises IO error on Linux Open

Difficulty 4/5 3-5 days Newbie friendliness 42/100

ocaml-multicore/eio#902 · 4 comments · Opened Jul 22, 2026
eio_linux should disable fixed buffers by default Open

Difficulty 3/5 1-2 days Newbie friendliness 48/100

ocaml-multicore/eio#845 · 3 comments · 1 reaction · Opened May 29, 2026
Proposal: Make Eio.Flow.buffer_sink closable Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

ocaml-multicore/eio#834 · Opened Mar 16, 2026
Proposal: Add tempdir utilities Stdenv.tmp, Path.open_temp_dir, etc. Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

ocaml-multicore/eio#831 · 4 comments · Opened Feb 17, 2026
Missing error handling in Eio.Net.run_server if "accept" fails Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

ocaml-multicore/eio#830 · 2 comments · Opened Feb 16, 2026
Add a `Pool.dispose` function Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

ocaml-multicore/eio#824 · Opened Nov 22, 2025
Path.mkdirs on windows return Permission_denied Open

windows

Difficulty 3/5 1-2 days Newbie friendliness 48/100

ocaml-multicore/eio#819 · 2 comments · Opened Aug 20, 2025
RWLock Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

ocaml-multicore/eio#811 · Opened Jul 6, 2025
Domains spawned by the Domain Manager do not inherit fiber-local state Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

ocaml-multicore/eio#807 · 9 comments · 1 reaction · Opened May 29, 2025
Sharing a Uring from a Parent to a Child Process Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

ocaml-multicore/eio#801 · 9 comments · Opened Apr 25, 2025
API request: predicate to check whether we are running under an event loop Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

ocaml-multicore/eio#800 · 2 comments · 1 reaction · Opened Apr 21, 2025
Eio.Resource and Type-Safety Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

ocaml-multicore/eio#774 · 12 comments · Opened Oct 28, 2024
Get main test-suite running on Windows Open

good first issue windows

ocaml-multicore/eio#761 · 12 comments · 1 reaction · 1 assignee · Opened Oct 4, 2024
Buf_write should have back-pressure Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 28/100

ocaml-multicore/eio#760 · 2 comments · Opened Oct 4, 2024
Disable Windows symlinking test Open

good first issue windows

Difficulty 3/5 1-2 days Newbie friendliness 35/100

ocaml-multicore/eio#759 · 16 comments · Opened Oct 2, 2024
Signal handlers may not run, especially with eio_linux Open

bug

Difficulty 5/5 Over a week Newbie friendliness 25/100

ocaml-multicore/eio#732 · Opened May 22, 2024
Extending eio from the outside Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

ocaml-multicore/eio#725 · 1 comment · Opened Apr 27, 2024
Restore "available" metadata on eio_windows Open

windows

Difficulty 1/5 Under an hour Newbie friendliness 62/100

ocaml-multicore/eio#619 · 2 comments · Opened Sep 22, 2023
Creating a process group in `Fork_action` (?) Open

Difficulty 4/5 3-5 days Newbie friendliness 32/100

ocaml-multicore/eio#595 · 1 comment · Opened Jul 28, 2023
Add Condition to `Eio.Std` Open

api enhancement

Difficulty 2/5 1-3 hours Newbie friendliness 38/100

ocaml-multicore/eio#580 · 3 comments · Opened Jul 11, 2023
Feature request: Stream select Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

ocaml-multicore/eio#577 · 6 comments · Opened Jul 8, 2023
Switches documentation Open

documentation

Difficulty 3/5 1-2 days Newbie friendliness 38/100

ocaml-multicore/eio#548 · 2 comments · Opened Jun 5, 2023
Redirecting stderr to stdout Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 45/100

ocaml-multicore/eio#546 · 3 comments · Opened Jun 5, 2023
Eio.Net: IPv6 multicast support Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

ocaml-multicore/eio#536 · 1 comment · Opened May 30, 2023
Eio.Net: SCTP support Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

ocaml-multicore/eio#535 · 1 comment · Opened May 30, 2023
Feature Request: `Eio.Process.of_pid` to "attach" the process_mgr to an existing process Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 15/100

ocaml-multicore/eio#525 · 2 comments · Opened May 24, 2023
Add missing file operations Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

ocaml-multicore/eio#510 · 3 comments · Opened May 8, 2023
odocs: Clicking on `Mutex.t` link gives 404 Open

documentation

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

ocaml-multicore/eio#486 · 1 comment · Opened Apr 13, 2023
integrate iperfv3 benchmark Open

ocaml-multicore/eio#479 · 4 comments · 1 assignee · Opened Mar 31, 2023
Add more stress tests and benchmarks Open

enhancement good first issue help wanted

ocaml-multicore/eio#450 · 12 comments · 1 assignee · Opened Feb 25, 2023
Confusing API for open_out: ~append Vs ~create Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

ocaml-multicore/eio#444 · 2 comments · Opened Feb 22, 2023
Make Waiters lock-free Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 30/100

ocaml-multicore/eio#382 · 5 comments · Opened Dec 5, 2022
docs: Eio_mock using datagram sockets Open

enhancement

Difficulty 3/5 1-2 days Newbie friendliness 35/100

ocaml-multicore/eio#372 · 2 comments · Opened Nov 20, 2022
Can't use connected UDP sockets Open

api bug

Difficulty 4/5 3-5 days Newbie friendliness 25/100

ocaml-multicore/eio#345 · 1 comment · Opened Oct 11, 2022
Mutex API ergonomics Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

ocaml-multicore/eio#336 · 13 comments · Opened Oct 1, 2022
Skip network tests when network is unavailable Open

good first issue help wanted

ocaml-multicore/eio#275 · 7 comments · 1 assignee · Opened Aug 9, 2022
Consider renaming Stream Open

api

Difficulty 5/5 Over a week Newbie friendliness 25/100

ocaml-multicore/eio#267 · 8 comments · 1 reaction · Opened Jul 29, 2022
Ctf tracing: extend the `Fiber` API to allow labelling fibers Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

ocaml-multicore/eio#216 · 2 comments · Opened May 17, 2022
Decide on cstruct vs bytes Open

api

Difficulty 5/5 Over a week Newbie friendliness 25/100

ocaml-multicore/eio#140 · 17 comments · Opened Jan 10, 2022
Windows support Open

enhancement windows

Difficulty 5/5 Over a week Newbie friendliness 25/100

ocaml-multicore/eio#125 · 29 comments · 1 reaction · Opened Jan 3, 2022

ocaml-multicore/eio

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