I plan to execute a command in a subprocess from a Lwt Framework (Dream). I guess, all Unix syscall (fork, pipe…) from the current (father) process should be done from Lwt_unix module, and the Unix syscall from the child process should be done directly from Unix (and avoid scheduling some Lwt promi…

See the documentation of Lwt_unix.fork, the options and recommendations are explained there.

Fork in a Lwt framework

cvine August 29, 2025, 9:34pm 3

Note though that Lwt_unix.fork isn’t safe for the reasons mentioned here. New processes and Lwt don’t work well together. Unix.create_process* is OK though.

2 Likes

Topic		Replies	Views
Lwt, fork, possible to reset Lwt_main.run? Learning lwt	6	787	March 30, 2022
Strange issue with Lwt_unix.wait_read not waiting when called from a compiled binary Ecosystem lwt	3	971	February 12, 2018
Best practice on mixing Async and Lwt? Ecosystem lwt , async	15	2566	November 23, 2019
Ignoring Lwt values Learning	13	1627	September 1, 2019
Lwt_unix.read from a large file and scheduling Learning lwt , unix	5	2186	July 7, 2017

Fork in a Lwt framework

Related topics