Lwt 5.1.2

Bugs fixed

• Do not run C exit hooks after failed exec (#764, diagnosed Lucian Wischik).
• discover.ml: don't add flags for missing system libraries (#760, #761, Olaf Hering).
• discover.ml: don't run the opam binary (#761).
• Warning on 4.10 in lwt_unix_stubs.c (#766).

Lwt 5.1.1

Bugs fixed

• Exception raised by Lwt_main.run upon call to exit (#758, reported Gal Schlezinger).

Lwt 5.1.0

Additions

• Lwt.all (9976f67).

Documentation

• Add index.mld for nicer odoc output (1059a80, prompted Anurag Soni).
• Link to rwo-lwt from the online manual to make it more discoverable (4129a22, suggested Anurag Soni).
• Fix doc links in opam files (7617607).

Lwt 5.0.1

Bugs fixed

• Additional fix for libev detection under esy (#757, Antonio Nuno Monteiro).

Lwt 5.0.0, Lwt_ppx 2.0.0

Breaking

See #584 for an extended summary and discussion of this release as a whole, or individual issues for each change specifically.

• The callback passed to Lwt.async must now evaluate to unit Lwt.t, rather than _ Lwt.t (#603, requested @cfcs).
• Lwt.choose, Lwt.nchoose, Lwt.nchoose_split, Lwt.pick, and Lwt.npick now raise Invalid_argument if given the empty list (#557, Tim Reinke).
• Catch nested calls to Lwt_main.run (#607, #609, prompted François-René Rideau).
• Use the new Lwt_unix.IO_vectors in Lwt_unix.recv_msg and Lwt_unix.send_msg (#594, prompted Marcello Seri).
• Make Lwt_unix.Async_switch a synonym for Lwt_unix.Async_detach (#572).
• Remove the redundant configure.ml (#700).
• PPX: remove support for general [%lwt ...] expressions (#527).
• PPX: remove support for Lwt_log and the -log option (#520).
• PPX: remove the -no-debug option (#528).

Bugs fixed

• libev detection under esy (#755, Antonio Nuno Monteiro).

Lwt 4.5.0

Additions

• Implement Lwt_unix.readv and Lwt_unix.writev on Windows using Lwt_unix.read and Lwt_unix.write (#745, requested Ulrik Strid).
• Implement Lwt_unix.wait4 on Android using Unix.waitpid, as on Windows (#752, @EduardoRFS).
• LWT_DISCOVER_ARGUMENTS=--verbose flag, passed through environment variable, for debugging the feature discovery (configuration) process (#740).

Bugs fixed

• To help with fork, don't call back into Lwt_main at process exit to call Lwt exit hooks when there are none (#737, prompted Martin Jambon).
• Properly retain references to buffers in Lwt_unix.readv, Lwt_unix.writev, Lwt_bytes.read, Lwt_bytes.write, and Lwt_bytes.mincore; the references could be released too early in rare circumstances (#742, prompted Olaf Hering).
• Don't install a SIGCHLD handler when Lwt is linked in but not used (#738, requested Sam Goldman, additional information Waleed Khan).
• Link with -lpthread on more platforms that support and require the flag (#748, Olivier Andrieu).
• Fix syntax errors in feature test programs (#748, Olivier Andrieu).
• C warning with OCaml 4.10 (#751, @kit-ty-kate).

Miscellaneous

• Make tests more reliable (#726, #743, prompted Olaf Hering).
• Fix deprecation annotation on internal API (#735, Antonio Nuno Monteiro).
• Fix broken link in Lwt_mvar docs (#739, reported @tg-x).
• Fix broken links in README (#750, @imbsky).

Lwt 4.4.0, Lwt_ppx 1.2.4

Additions

• ?suffix argument for Lwt_io.with_temp_file and Lwt_io.open_temp_file (#724, requested Volker Diels-Grabsch).
• Lwt_io.with_temp_dir and Lwt_io.create_temp_dir (#724, requested Volker Diels-Grabsch).

Changes

• Lwt_io.establish_server: increase default backlog from 5 to SOMAXCONN (#731, suggested Konstantin Olkhovskiy).
• PPX: use OCaml 4.09 ASTs to support recent features (074f679).
• PPX: deprecate let%lwt structure items (#733, prompted Didier Le Botlan).

Miscellaneous

• Tests now pass in more environments (#721, #722, #725, #729, reported Olaf Hering).

Lwt 4.3.1

Bugs fixed

• Lwt clobbered backtraces (#714, 6e855b8, 4694853, reported Volker Diels-Grabsch).
• Lwt_unix.fork was broken on glibc 2.28 (#704, @ygrek).
• Fix build with musl-gcc (#718, #719, reported Fabian Hemmer).
• Support more Lwt_unix.madvise options (#716, Anton Kochkov).

Miscellaneous

• Silence configure script (#717, requested Anil Madhavapeddy).
• Greatly sped up CI and tests.

Lwt 4.3.0, Lwt_ppx 1.2.3, Lwt_react 1.1.3

Planned to break in 5.0.0

For general discussion of breakage in Lwt 5.0.0, see #584. See #293 about how Lwt announces and does breaking changes.

• The signature of Lwt.async will change from (unit -> 'a Lwt.t) -> unit to (unit -> unit Lwt.t) -> unit (#603, prompted @cfcs).
• Lwt_unix.send_msg and Lwt_unix.recv_msg will be changed to take Lwt_unix.IO_vectors.t instead of Lwt_unix.io_vectors (#702, prompted Marcello Seri).
• Nesting calls to Lwt_main.run will be forbidden, and will raise an Failure. Most programs don't do this (#609, prompted François-René Rideau).
• configure.ml will be removed in favor of an improved discover.ml This affects only users who are configuring Lwt as part of a manual installation (i.e., not users of opam or esy). See discover.ml for usage (#700).
• Lwt_unix.async_method will have no effect. In practice, it already does nothing, and has almost no users (#572).

The following planned breaking changes have already been announced:

• Lwt.pick will raise Invalid_argument on the empty list, instead of returning a forever-pending promise. Also applies to Lwt.choose, Lwt.npick, Lwt.nchoose, and Lwt.nchoose_split (#562, Tim Reinke, prompted Hezekiah Carty).
• Remove translation of [%lwt ...] to Lwt.catch from the PPX (#527).
• Remove -no-debug option from the PPX (#528).
• Remove Lwt_log support from the PPX (#520).

Additions

• Lwt_process: allow setting working directory for new processes (#694, Thomas Leonard).
• PPX: use OCaml 4.08 ASTs to support latest features (#697).
• Lwt_io.NumberIO: use compiler intrinsics for better performance (#178, requested Mauricio Fernandez).

Bugs fixed

• Race condition in Lwt_react.S.limit (4e592eb).
• Use fallback rule during configuration (#693, Hongchang Wu).
• Fix typos (#688, #692, @Fourchaux).

Lwt 4.2.1

Bug fixed

• Detect libev correctly when building under esy (#679, Antonio Nuno Monteiro).