prelude: don't set Lwt_engine to poll if libev is available#52
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libev is default if it is available (both opam package and c library during lwt build), otherwise default is select which is worse than poll (limit on 1024 fd) and poll is guaranteed to be available. So ideally the fix should be - check if engine is select and if so - switch to poll, otherwise do nothing |
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I didn't find a way to do this, engine is object with no way to identify afaics Instead I made it check for libev availability, and use poll if not available |
rr0gi
approved these changes
Nov 24, 2025
| *) | ||
| let () = | ||
| Lwt_engine.set @@ new Lwt_engines.poll | ||
| if not (Lwt_config._HAVE_LIBEV && Lwt_config.libev_default) then begin |
yasunariw
changed the title
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started making it possible to identify current engine, see ocsigen/lwt#1097 |
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Setting the lwt engine to poll at the top level here causes unexpected behavior when the library is used. On Linux, it overrides the default engine, which is libev.