ocsigen/lwt

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OCaml promises and concurrent I/O

Stars: 793
Forks: 186
Open beginner issues: 0
Indexed issues: 69

Dominant language: OCaml
License: MIT
Last GitHub push: Jul 11, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: No beginner labels indexed
PR merge metrics: No merged PRs in 30d

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69 open issues indexed

Lwt_unix should use `caml_unix_check_path` or `caml_string_is_c_safe` for C stubs that take a string as input Open

Difficulty 3/5 1-2 days Newbie friendliness 55/100

ocsigen/lwt#1124 · Opened Aug 18, 2026
Lwt_io.establish_server*: max number of connections Open

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

ocsigen/lwt#1111 · Opened Jun 19, 2026
All `*_s` combinators of Lwt_react eat exceptions silently Open

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

ocsigen/lwt#1101 · 2 comments · Opened Feb 12, 2026
lwt.5.9.2 doesn't compile anymore on Windows with the Cygwin backend Open

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

ocsigen/lwt#1081 · 8 comments · Opened Oct 10, 2025
Fix CI on macos Open

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

ocsigen/lwt#1076 · 1 comment · Opened Sep 9, 2025
dlopen cannot locate symbol "lwt_unix_not_available; cannot locate symbol "caml_unix_cloexec_default Open

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

ocsigen/lwt#1051 · 2 comments · Opened Feb 2, 2025
Linking for Lwt_unix Open

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

ocsigen/lwt#1031 · 1 comment · Opened Oct 15, 2024
Lwt not handling Ctrl+C correctly when running in Docker Open

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

ocsigen/lwt#1027 · 1 comment · 1 reaction · Opened Aug 22, 2024
Document history, especially the relation to Lwt from unison Open

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

ocsigen/lwt#1018 · Opened May 5, 2024
Lwt does not use `Sys.set_signal` Open

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

ocsigen/lwt#1012 · Opened Apr 15, 2024
How to use Lwt_unix with OCaml 5 effects? Open

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

ocsigen/lwt#1003 · 4 comments · Opened Nov 12, 2023
Documentation of `Lwt_stream.create` and `Lwt_stream.get` Open

Difficulty 1/5 1-3 hours Newbie friendliness 32/100

ocsigen/lwt#990 · Opened May 4, 2023
Have a separate set of `Lwt_process.pread` that also return the process status Open

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

ocsigen/lwt#989 · 2 comments · Opened May 2, 2023
Clarify documentation of Lwt_stream.get_available Open

Difficulty 1/5 Under an hour Newbie friendliness 45/100

ocsigen/lwt#988 · Opened Apr 20, 2023
Default Unix pool size (1000) is insane and dangerous Open

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

ocsigen/lwt#974 · 2 reactions · Opened Jan 7, 2023
memory consumption blowups in downstream projects using Lwt Open

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

ocsigen/lwt#972 · 5 comments · Opened Nov 13, 2022
forking breaks lwt-io if happens after Lwt_main.run Open

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

ocsigen/lwt#970 · 3 comments · Opened Oct 28, 2022
passing `env` in `Lwt_process` doesn't work on Windows Open

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

ocsigen/lwt#966 · 1 comment · Opened Oct 19, 2022
Support `Lwt_process` in multi-domain settings Open

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

ocsigen/lwt#959 · 1 comment · Opened Jun 30, 2022
EBADF from Lwt_process.with_* Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

ocsigen/lwt#956 · 4 comments · Opened Jun 24, 2022
`src/unix/config/discover.exe` puts too much `-I` includes which can mislead the compiler Open

Difficulty 3/5 1-2 days Newbie friendliness 42/100

ocsigen/lwt#944 · Opened May 17, 2022
Ppx_lwt docs link returns 404 error (since 5.4.0) Open

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

ocsigen/lwt#926 · 1 comment · Opened Jan 30, 2022
Provide `Lwt.sleep` as a Unix-less function Open

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

ocsigen/lwt#924 · 3 comments · 1 reaction · Opened Jan 25, 2022
Proposals to get rid of the obscure Lwt_io.Channel_closed("input") exception when a Lwt_process times-out Open

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

ocsigen/lwt#919 · 7 comments · 2 reactions · Opened Jan 10, 2022
Suggestion: make Lwt_unix and Lwt_js implement a virtual library with their shared signature Open

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

ocsigen/lwt#915 · 1 comment · Opened Dec 22, 2021
Use the Lwt PPX inside Lwt Open

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

ocsigen/lwt#912 · 5 comments · 2 reactions · Opened Dec 6, 2021
Lwt and OCaml 5 Open

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

ocsigen/lwt#897 · 4 comments · 3 reactions · Opened Oct 17, 2021
Segmentation Fault: in process#close (docker / musl / alpine --only) Open

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

ocsigen/lwt#889 · 1 comment · Opened Sep 28, 2021
Feature request: implement `Unix.realpath` for OCaml 4.13.0 Open

Difficulty 2/5 1-3 hours Newbie friendliness 42/100

ocsigen/lwt#888 · 1 reaction · Opened Sep 21, 2021
Error: Unbound type constructor Result.result Open

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

ocsigen/lwt#879 · 1 comment · Opened Aug 30, 2021
Provide "close on exec" in Lwt_unix and "close all fds" in Lwt_process Open

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

ocsigen/lwt#872 · 3 comments · Opened Jul 24, 2021
Lwt should depend on conf-libev Open

Difficulty 1/5 Under an hour Newbie friendliness 42/100

ocsigen/lwt#871 · 9 comments · 3 reactions · Opened Jul 12, 2021
Link to "canceable" broken Open

Difficulty 2/5 1-3 hours Newbie friendliness 42/100

ocsigen/lwt#867 · 5 comments · Opened Jun 3, 2021
Link to dev version of documentation is dead Open

Difficulty 1/5 Under an hour Newbie friendliness 45/100

ocsigen/lwt#866 · Opened Jun 3, 2021
Lwt.npick and Lwt.nchoose return type Open

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

ocsigen/lwt#857 · 2 comments · Opened May 21, 2021
Unexpected behavior of `cancel` with `Lwt_stream.iter_n` Open

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

ocsigen/lwt#845 · Opened Mar 31, 2021
Missing or improper flush on "%!" Open

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

ocsigen/lwt#841 · 10 comments · Opened Feb 19, 2021
Suggestion to clarify exception management in the docs. Open

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

ocsigen/lwt#840 · 1 comment · 3 reactions · Opened Feb 10, 2021
Dead links in the readme Open

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

ocsigen/lwt#839 · 2 comments · Opened Feb 1, 2021
Error code from getaddrinfo is lost Open

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

ocsigen/lwt#835 · 5 comments · Opened Jan 20, 2021
Lwt_result test suite Open

Difficulty 3/5 1-2 days Newbie friendliness 30/100

ocsigen/lwt#823 · 2 comments · 1 reaction · Opened Nov 26, 2020
A Roadmap for Porting lwt.unix to libuv Open

proposal

Difficulty 5/5 Over a week Newbie friendliness 18/100

ocsigen/lwt#813 · 13 comments · 14 reactions · Opened Oct 27, 2020
semantics/documentation of Lwt_unix.fork Open

docs

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

ocsigen/lwt#812 · 3 comments · Opened Oct 23, 2020
Lwt_unix.getaddrinfo hangs Open

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

ocsigen/lwt#797 · 1 comment · Opened Aug 7, 2020
Avoid dependencies on compatibility modules when possible Open

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

ocsigen/lwt#794 · 8 comments · 1 reaction · Opened Jul 9, 2020
Explicit backtrace handling Open

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

ocsigen/lwt#720 · 3 reactions · Opened Sep 25, 2019
Improve performance in CPU-bound programs Open

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

ocsigen/lwt#622 · 8 comments · 8 reactions · Opened Sep 19, 2018
Tell libev to use kqueue by default on macOS Open

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

ocsigen/lwt#601 · 5 comments · 3 reactions · Opened Jun 27, 2018
Optimize Lwt_io.establish_server(_with_client_socket) Open

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

ocsigen/lwt#600 · 1 reaction · Opened Jun 20, 2018
Async jobs are never killed Open

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

ocsigen/lwt#588 · 1 comment · 1 reaction · Opened May 4, 2018

ocsigen/lwt

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