Release Lwt 2.7.0 · ocsigen/lwt

General

Values of types 'a Lwt.t are now referred to as promises rather than threads (#300). The manual has not yet been updated.

Breaking

After this release, Lwt will switch to semantic versioning. Future breaking changes will first require deprecation, then a major version number increase (#293).
Lwt no longer supports OCaml 4.01 (#272).
Lwt_unix.fdatasync is no longer available on macOS. It was calling an undocumented system call on that system (#285, Jeremy Yallop).

Planned to break in 3.0.0

APIs in this category have deprecation messages attached. The messages will be displayed if you recompile your code, and can also be seen in #308.
Lwt_engine.libev will have an argument for selecting the libev back end (#269, #294, Jeremy Yallop).
Lwt_io.establish_server will be replaced by a version that makes it difficult to leak file descriptors (#258, #260).
Lwt_io.shutdown_server will evaluate to a promise, which indicates when the close operation completes (#259).
Lwt_unix.bind will evaluate to a promise, since bind can block for Unix domain sockets (#296, requested David Sheets).
ocamlfind packages lwt.react, lwt.ssl, and lwt.glib will be replaced by the new lwt_react, lwt_ssl, and lwt_glib. These are now distributed in new OPAM packages with the same names, separately from OPAM package lwt (#301).

Additions

Lwt_unix.readv and Lwt_unix.writev – zero-copy scatter/gather I/O (#291, #299).
?fail_on_error argument for Lwt_log.load_rules (#306, Daniil Baturin).
Lwt_log.level_of_string (#306, Daniil Baturin).

Changes

Lwt_stream.of_list, Lwt_stream.of_array, Lwt_stream.of_string now immediately push all elements into the created streams (#239, Spiros Eliopoulos).

Deprecations

Lwt_stream.map_exn in favor of Lwt_stream.wrap_exn, which uses OCaml's standard result type (#295).

Bugs fixed

Miscellaneous

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