Lwt 4.2.0, Lwt_ppx 1.2.2, Lwt_react 1.1.2

Additions

• Lwt.both (#668, Brendan Long, Jeremy Yallop).
• ppx_let support with open Lwt.Infix (#667, Brendan Long).
• Lwt_stream.of_seq (#646, Hezekiah Carty).
• Lwt_io.is_closed (#635, Andreas Garnaes).
• Lwt_unix.IO_vectors.byte_count (#645, Raphaël Proust).
• Support for higher baud rates in Lwt_unix.tcgetattr and Lwt_unix.tcsetattr (#678, Frédéric Fortier).
• Replacement functions in Lwt_main for deprecated functions based on Lwt_sequence (#660).

Bugs fixed

• OCaml 4.08 compatibility (#658).
• Stack overflow in Lwt_stream.iter_p (#432, Varun Kohli).
• Incorrect bounds check in Lwt_bytes.mincore (#627, Cédric Le Moigne).
• Lwt_bytes.mincore will not be available in future releases of OpenBSD (#663, Kenneth Westerback).
• Missing header in the Android build (#652, Justus Matthiesen).
• Build broken on MSVC (98303de, 85535f7, Dmitry Bely).
• Build broken on OpenBSD (#672, Christopher Zimmermann).
• Lwt_io.of_bytes produces a channel with inaccurate positions (#636, Nathan Rebours).
• Lwt_io._.read_int behaves incorrectly on 32-bit systems (#671, reported Dmitry Bely).
• Inaccurate locations for errors related to ;%lwt (#602, @kandu).
• (_ : t) not recognized as a catch-all pattern by the PPX (#640, Florian Angeletti).
• Race condition in Lwt_react.E.limit (#606, Avni Fatehpuria).
• Premature deallocation in Lwt_react.E.with_finaliser and Lwt_react.S.with_finaliser (#626, El-Hassan Wanas).

Miscellaneous

• New tests for Lwt_bytes, portions of Lwt_unix (#619, #621, #628, #630, #673, Cédric Le Moigne, Anurag Soni).
• Test suite improvements (#656, Dave Parfitt).
• Clarifications for documentation of Lwt.try_bind, Lwt.pick (#648, #650, Bikal Lem).
• Fixed documentation of Lwt_io.read_line (#657, Yoni Levy).
• Fixed some typos (#611, #613, Rich Neswold).

Lwt 4.1.0, Lwt_ppx 1.2.1

Additions

• Change license to MIT (#560).
• Lwt_fmt, an Lwt-aware version of Format (#548, Gabriel Radanne).
• Lwt_io.establish_server_with_client_socket (#586).

Bugs fixed

• Lwt_stream.iter_n: rename ?max_threads argument to ?max_concurrency (#581, Hezekiah Carty).
• PPX: reject match expressions that have only exception cases (#597, Raphaël Proust).

Miscellaneous

• Improvements to Lwt_pool docs (#575, Bobby Priambodo).
• Restore all PPX tests (#590, Jess Smith).

Lwt 4.0.1

Bugs fixed

• Race condition in worker thread management in Lwt_unix (#569, diagnosed Gabe Levi).
• Hang in Lwt_unix.read on Windows (#574, #569, 86a6baf, diagnosed Gabe Levi).
• Docs: note that Lwt_io.open_file for writing truncates the file by default (#570, reported Tóth Róbert).

Lwt 4.0.0, Lwt_ppx 1.2.0, Lwt_react 1.1.1

Breaking

These changes were announced in Lwt 3.1.0 and Lwt 3.2.0. See #453 about smooth upgrade paths.

• Delete package lwt.ppx. The PPX syntax is in package lwt_ppx since Lwt 3.2.0 (#338).
• Remove >> syntax from the PPX (#495).
• Delete modules Lwt_log, Lwt_daemon, Lwt_log_core, and package lwt.log. These are in package lwt_log since Lwt 3.2.0, but it is recommended to use Logs_lwt from the logs library instead (#484, initiated Hannes Mehnert).
• Delete package lwt.preemptive. It is an alias for lwt.unix since Lwt 3.2.0 (#487).
• Delete package lwt.syntax. The Camlp4 syntax is in package lwt_camlp4 since Lwt 3.2.0 (#370).
• Delete module Lwt_chan, a predecessor of Lwt_io (#441).
• Delete package lwt.simple-top, a predecessor of utop (#371).
• Make resolvers (Lwt.u) contravariant (#458).

Planned to break in 5.0.0

• 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).

Bugs fixed

• Lwt_io.file_length now fails with EISDIR when used on a directory (#563, requested Cedric Cellier).
• Lwt_react.E.limit and Lwt_react.S.limit now working more correctly (#566, @Freyr666).

Miscellaneous

• Documentation improvements (#561, Jason Evans).

Lwt 3.3.0, Lwt_ppx 1.1.0

Bugs fixed

• Restore backtrace support in the PPX (#554, #556, Gabe Levi).
• Serious logic error that could cause Lwt to hang or crash (#549, reported @koen-struyve).
• All Lwt_list functions are now tail-recursive (#538, Joseph Thomas).

Additions

• Support ;%lwt syntax in the PPX (#307, Hezekiah Carty).
• Lwt_stream.iter_n (#312, Hezekiah Carty).

Miscellaneous

• Testing improvements (#536, #541, @cedlemo).
• Documentation improvements (#544, #546, #547, #553, #559, Daniil Baturin, Jason Evans, Jess Smith, Milo Turner).

Lwt_ppx 1.0.1, Lwt 3.2.1

Lwt 3.2.1 is released because it still packages lwt.ppx, a deprecated copy of package lwt_ppx, and the two packages should be kept in sync.

Deprecations

• All PPX options are deprecated and should not be used (#534).
• The [%lwt ...] PPX syntax should be replaced by Lwt.catch (#534).

Fixes

• Clean up PPX -help usage message output (#525, Zan Doye).

Miscellaneous

• More thorough testing (#512, #535, Joseph Thomas).
• Clarification of the C binding (#521, @cedlemo).

Lwt 3.2.0

Additions

• Lwt_mvar.take_available, Lwt_mvar.is_empty (#459, Hezekiah Carty).
• Lwt_io.open_temp_file, Lwt_io.with_temp_file (#467, Joe Thomas).
• New reference documentation for module Lwt (#469).
• Lwt_pool.clear and ?dispose argument for Lwt_pool.create (#483, Hezekiah Carty).
• Lwt_pool.wait_queue_length (#493, Jerome Vouillon).

Bugs fixed

• Lwt.npick never worked (#447, Zack Coker).
• Lwt_pool.use now always calls ?validate on elements (#461, Joe Thomas).
• Better locations generated by the PPX (#470, Fabian Hemmer).
• Keep worker thread count accurate in Lwt_unix when pthread_create fails (#493, @koen-struyve).
• Leaked exceptions in Lwt_list (#499).
• Memory leak in Lwt_unix.getnameinfo (#503, Hannes Mehnert).

Planned to break in 4.0.0

See #453 for details and instructions about planned breakage in Lwt 4.0.0.

• The semantics of Lwt will be adjusted for better exception and stack safety (#500).
• The PPX will be factored out into its own opam package, lwt_ppx. This package is installable from opam now, as of Lwt 3.2.0 (#338).
• Similarly, the deprecated Camlp4 syntax will be factored out into lwt_camlp4, which is installable from opam now (#370).
• Modules Lwt_log, Lwt_log_core, Lwt_log_rules, and Lwt_daemon are being deprecated and factored out into opam package lwt_log, also installable from opam now. Use the logs library for logging, in particular module Logs_lwt. Direct daemonization is deprecated on most platforms (#484, Hannes Mehnert).
• The >> construct from the PPX will be deleted (#471, Raphaël Proust).
• Package lwt.preemptive is being merged into lwt.unix. In 3.2.0, lwt.preemptive becomes an alias for lwt.unix, and the package name lwt.preemptive will be deleted in 4.0.0 (#487).

Deprecations

• Lwt.waiter_of_wakener should not be used, as it can lead to soundness bugs in future (but not current) Lwt (#458).
• Lwt_sequence was deprecated in Lwt 2.6.0, but it now has a warning attached, as do Lwt.add_task_r and Lwt.add_task_l, which use it (#361).
• Use of the following functions is discouraged, but they have not yet received deprecation warnings: Lwt.with_value, Lwt.cancel, Lwt.state, Lwt.ignore_result (#359, #469).

Miscellaneous

• Replace references to Camlp4 in the manual with the PPX (#457, Bobby Priambodo).
• More tests for Lwt_pool (#464, Joe Thomas).
• Expect tests for the PPX (#474, Fabian Hemmer).

Lwt_ssl 1.1.1

• Compatibility with -safe-string, and thus OCaml 4.06. Lwt_ssl.read and Lwt_ssl.write now take a buffer of type bytes as argument, rather than a buffer of type string (#479).

Lwt 3.1.0

Additions

• Port to Jbuilder (#374, Andrew Ray).
• Lwt_io.establish_server_with_client_address (#346, Rudi Grinberg).
• Lwt_unix.getcwd (#403, Raphaël Proust).

Planned to break in 4.0.0

• Delete lwt.simple-top (#371).
• Delete Lwt_chan (#441).

Fixes

• Make Lwt_log functions tail-recursive (#348, Jan Doms).
• Make more of Lwt_list tail-recursive (#347, Jan Doms).
• Improve string messages in exceptions (#368, #382, Jan Doms, Raphaël Proust).
• Don't call Unix.set_nonblock or Unix.clear_nonblock unnecessarily on some fds (#356, David Sheets).
• Lwt_unix.sleep and Lwt_unix.timeout returning too early when using libev (#433, Stijn Devriendt).
• Lwt_sequence.fold_r iterating the wrong way in some cases (#405, Stijn Devriendt).
• Build conflicts in some cases due to duplicate cst_to_constr function (#362, Jérémie Dimino).
• Don't use deprecated readdir_r system call (#430, Raphaël Proust).

Miscellaneous

• The Lwt core, lwt.ml, has been thoroughly refactored and commented (#354, reviewed Gabriel Radanne, Edwin Török, Raphaël Proust, Jan Doms, Fabian Hemmer, Sebastien Mondet, Simon Cruanes, Anil Madhavapeddy, Pierre Chambart, and many others).
• Lots of tests for most of the Lwt core (#339, #389, #392, #440, #448, #450, Joseph Thomas, Ryan Slade).
• Documentation fixes (including by Joseph Thomas, Raphaël Proust, Richard Degenne, Stavros Polymenis).
• Contributing documentation (#379).
• Massively adjust whitespace for legibility (#400, #409, #416, Richard Degenne).
• Improvements to CI (Etienne Millon, Raphael Rafatpanah, Zack Coker, Yotam Barnoy).
• The additional packages lwt_ssl, lwt_react, lwt_glib get new minor releases, the change being new Jbuilder build systems (#374, Andrew Ray).

Lwt 3.0.0

Breaking

• These changes were originally announced in release 2.7.0 (#308).
• Lwt_engine.libev now has an optional argument for selecting the libev back end (#269, #294, Jeremy Yallop).
• Lwt_io.establish_server has been changed to make it more difficult to leak file descriptors (#258, #260).
• Lwt_io.shutdown_server now evaluates to a promise, which completes when the listening socket's close(2) operation completes (#259).
• Lwt_unix.bind now evaluates to a promise, because the bind(2) system call can block for Unix domain sockets (#296, requested David Sheets).
• ocamlfind packages lwt.react, lwt.ssl, lwt.glib are replaced by lwt_react, lwt_ssl, lwt_glib. These have been separate OPAM packages, under those names, since 2.7.0 (#301).