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===== 5.7.0 =====
====== Breaking API changes ======
* Lwt_result.catch now takes a function (unit -> 'a t) rather than a promise ('a t). (#965)
* Remove the deprecated Lwt.result type (use Stdlib.result instead). (#968)
* Remove the deprecated Lwt.make_value and Lwt.make_result functions (use Ok and Error instead). (#968)
* Remove the deprecated and unsafe waiter_of_wakener (keep the waiter around when you create the wakener instead). (#968)
* Remove the deprecated Lwt_stream.on_termination and Lwt_stream.on_terminate (bind to Lwt_stream.closed instead). (#968)
* Remove the deprecated Lwt_stream.result type (use Stdlib.result instead). (#968)
* Remove the deprecated Lwt_stream.map_exn function (use wrap_exn instead). (#968)
====== Additions ======
* Lwt.Exception_filter for enabling/disabling system-exception catching. (#964)
* Lwt.reraise an exception raising function which preserves backtraces, recommended for use in Lwt.catch. (#963)
* Expose Lwt_io.delete_recursively for deleting a directory and its content recursively. (#984, Antonin Décimo)
* Lwt_preemptive.run_in_main_dont_wait to run a function in the main preemptive thread but without waiting for the result. (Kate Deplaix, #960)
* Lwt_unix.handle_signal and Lwt_engine.forwards_signal to allow other IO libraries (such as Eio) to share signal handlers. (Thomas Leonard, #993, #991)
====== Build ======
* Remove unused dependency in dune file. (#969, Kate Deplaix)
* Fix some compilation warnings for C stubs with OCaml 5. (#976, Antonin Décimo)
====== Fixes ======
* Use SA_ONSTACK on OCaml5 to avoid SIGSEGV. (Thomas Leonard, #993, #981)
* Fix race in worker loop. (Thomas Leonard, #993, #994)
* Fix marshall header size in Lwt_io.read_value. (Simmo Saan, #995)
====== Misc ======
* Resolve paused promises only once in main loop. This lets Lwt.pause behave identical to Lwt_unix.yield. (#917, Christopher Zimmermann, Favonia)
===== 5.6.1 =====
====== Fixes ======
* Fix null file descriptor being closed when used as redirection for standard fd of child processes. (#957, Antonin Décimo)
===== 5.6.0 =====
====== Installability ======
* Lwt is now compatible with OCaml 5.00. Lwt is now incompatible with OCaml 4.02. (#925, #923, Kate Deplaix, Patrick Ferris)
* Lwt is now incompatible with OCaml.4.07 and earlier. (#947, Hannes Mehnert, Tim McGilchrist)
* Lwt-unix is now compatible with OCaml 5.0.0. (#953, David Allsopp)
====== Additions ======
* In the Lwt_io module, add `?cloexec:bool` optional arguments to functions that create file descriptors (`pipe`). The `?cloexec` argument is simply forwarded to the wrapped Lwt_unix function. (#872, #911, Antonin Décimo)
* Add Lwt_result.error, Lwt_result.iter, and Lwt_result.iter_error for consistency with Stdlib. (#927, Antonin Décimo)
* Lwt_result.bind_error. (#943, Boning Dong)
* Add ?cloexec parameter to Lwt_io.pipe. (#911, Antonin Décimo)
====== Misc ======
* On Windows, make Lwt_process.create_process duplicate standard handles given to the child process if they're not inheritable, to mimic the behaviour of Unix.create_process. (#909, Antonin Décimo)
* Add missing dependency to `cppo` in lwt-react's opam file. (#946, Rizo I)
* Improve documentation (especially internal links). (#928, Antonin Décimo)
* Fix documentation of infix choose. (#952, Reynir Björnsson)
* Only define OCAML_NAME_SPACE for OCaml<5.0.0. (#929, Antonin Décimo)
* Replace mentions of Pervasives with Stdlib in the doc. (#954, Antonin Décimo)
* Improve deprecation message for auto_yield. (#908, Seb Mondet)
* Fix mirage tutorial link. (#936, Tuomas Lukka)
* Fix issues in opam file. (#937, Andreas Hauptmann)
====== Fixes ======
* Fix win32_spawn leaking dev_null fd in the parent process. (#906, Antonin Décimo)
* Prefer SetHandleInformation to DuplicateHandle in set_close_on_exec for sockets. DuplicateHandle mustn't be used on sockets. (#907, Antonin Décimo)
* Lwt.pick and Lwt.choose select preferentially failed promises as per documentation (#856, #874, Raman Varabets)
* Use the WSA_FLAG_NO_HANDLE_INHERIT on Windows when creating sockets with WSASocket if the cloexec (non-inheritable) parameter is true. Fixes a Windows problem where a child process would inherit a supposedly non-inheritable socket. (#910, Antonin Décimo)
* Fix macOS/arm64 tests which have a 16k page. (#932, Kate Deplaix)
* Fix Lwt_unix.closedir incorrectly checking the return value of closedir(3). (#942, Antonin Décimo)
* Fix custom_operations struct not fully initialized after OCaml 4.08. (Antonin Décimo, #918)
* Fix missing include directive. (#940, Antonin Décimo)
* Fix missing initialisation in Unix stub. (#941, Antonin Décimo)
====== Deprecations ======
* Alias Lwt_result.map_err and Lwt_result.bind_lwt_err to Lwt_result.map_error and Lwt_result.bind_lwt_error for consistency with Stdlib. (#927, Antonin Décimo)
===== 5.5.0 =====
====== Deprecations ======
* Lwt_main.yield and Lwt_unix.yield are deprecated in favor of the generic Lwt.pause, and Lwt_unix.auto_yield is deprecated in favor of the new Lwt_unix.auto_pause. Currently, Lwt_main.run resolves paused promises more frequently than yielded promises; the difference is unintended but existing applications could unintentionally depend on it. (#855, #858, Favonia)
====== Fixes ======
* Use is_blocking in dup and dup2 to fix ENOTSOCK on Windows. (#869, Antonin Décimo)
* Lwt_unix.lstat was incorrectly calling Unix.stat on Win32. Fixes the behavior of Lwt_io.with_temp_dir following symlinks to directories on Win32. (#883, Antonin Décimo)
* Support deleting symlinks on Windows during cleanup of Lwt_io.with_temp_dir. (#886, Antonin Décimo)
* Lwt_react.S.l[2-6]_s used polymorphic equality which could cause errors when handling functional values. (#893, Jérôme Vouillon)
* On Windows, treat ERROR_BROKEN_PIPE on read as zero-read instead of error. See OCaml PR #4790. (#898, Antonin Décimo)
* Fix compilation under MSVC by replacing Noreturn with CAMLnoreturn. (#880, #887, Nicolás Ojeda Bär)
====== Additions ======
* Lwt_bytes.blit_from_string: string complement of Lwt_bytes.blit. (#882, Hugo Heuzard)
* Lwt_seq: a Seq-like data-structure with Lwt delayed nodes. (#836, #842, Zach Shipko)
* Lwt_unix.auto_pause: the replacement of Lwt_unix.auto_yield that uses Lwt.pause instead of Lwt_unix.yield. (#855, #858, Favonia)
* Lwt_stream.return, Lwt_stream.return_lwt: singleton stream constructors. (#864, Boning Dong)
* Add ?to_dir param from Unix.symlink to Lwt_unix.symlink wrapper. (#884, Antonin Décimo)
* Lwt_stream.of_lwt_seq to convert an Lwt-sequence into an Lwt-stream. (#873)
* Support IPv6 (always) and PF_UNIX (with OCaml >= 4.14) socketpair on Windows. (#870, #876, Antonin Décimo, David Allsopp)
* In the Lwt_unix module, add `?cloexec:bool` optional arguments to functions that create file descriptors (`dup`, `dup2`, `pipe`, `pipe_in`, `pipe_out`, `socket`, `socketpair`, `accept`, `accept_n`). The `?cloexec` argument is simply forwarded to the wrapped Unix function (with OCaml >= 4.05, see PR ocaml/ocaml#650), or emulated as best-effort with `Unix.set_close_on_exec` on older OCaml versions. (#327, #847, #872, #901, Antonin Décimo)
* Lwt_domain: helpers for using domainslib from Lwt. (#860, Sudha Parimala)
====== Misc ======
* Code quality improvement: remove an unneeded Obj.magic. (#844, Benoit Montagu)
* On Windows, use the Unicode API in C stubs and functions introduced in OCaml 4.06 to handle Unicode strings. Raise the minimum requirement to OCaml 4.06 (on Windows only). (#843, #903, Antonin Décimo)
* More complete coverage in the CI. (#890, #894, #896, Sora Morimoto)
* Code quality improvement: use exception pattern instead of try-with. (#895, Antonin Décimo)
* Code quality improvement: fix warnings on 4.13. (#899)
===== 5.4.2 =====
====== Bugs fixed ======
* Fix compilation on Windows by providing missing dummy stubs (#868, Andreas Hauptmann, Antonin Décimo).
===== 5.4.1 =====
====== Bugs fixed ======
* Fix Lwt_fmt.stderr to actually point to stderr (#852, #850, Volker Diels-Grabsch).
* Make temporary files created by Lwt_io.with_temp_dir deletable on Windows by removing the RO bit (#849, #861, Antonin Décimo).
* Handle ECONNABORTED in Lwt_io.establish_server* (#829, #830, Reynir Björnsson, Hannes Mehnert).
====== Bugfixes ======
* Fix Lwt_fmt.stderr to actually point to stderr (#852, #850, Volker Diels-Grabsch).
* Lwt_io.establish_server* handles ECONNABORTED (#829, #830, Reynir Björnsson)
===== 5.4.0 (2020-12-16) =====
====== Installability ======
* Support for OCaml 4.12 (#804, #826, Kate Deplaix).
* lwt_ppx now uses ppxlib. This introduce a transitive dependency to OCaml.4.04 (#807, Philippe Veber).
====== Bugfixes ======
* Catch exceptions in Lwt_react.of_stream (#809, Petter A. Urkedal).
* Avoid segfaults in Lwt_unix.tcsetattr (#798, Frédéric Fortier).
====== Additions ======
* fork method in Lwt_engine. This method is a noop in the released engines but it paves the way to a libuv-based engine (#811, Ulrik Strid, Anton Bachin).
* Lwt_main.abandon_yielded_and_paused for use in conjunction with Lwt.fork (#789, Julien Tesson).
* Lwt.wrap_in_cancelable to complete protect and no_cancel (#785).
* Support for IOV_MAX in [Lwt_unix.IO_vectors.system_limit (#801, Pino Toscano).
* Lwt_unix.send_msgto (#805, Antonio Nuno Monteiro).
* Lwt.dont_wait, a more explicit alternative to Lwt.async (#820, François Thiré).
====== Miscellaneous ======
* Avoid double-reversing when traversing lists. This may change the order in which some promises are collected, which may change which of several rejection is arbitrarily selected during concurrent traversal (#784).
* Numerous documentation improvements (including external contributions from Bikal Lem, Sudha Parimala, and Hannes Mehnert).
===== 5.3.0 (2020-04-22) =====
* Add let* and and* in Lwt.Syntax and Lwt_result.Syntax (#775, Rahul Kumar).
* Also add let+ and and+ (#776, Craig Ferguson).
* Add Lwt_result.both (#775, Rahul Kumar).
* Always use libev if detected (#601).
===== 5.2.0 (2020-03-09) =====
* Add Lwt_unix.pread, Lwt_unix.pwrite, and Lwt_unix.pwrite_string (#768,
Pierre Chambart).
* Internally use accept4(2) when available (#769, Pierre Chambart).
* PPX: internally use 4.10 ASTs (#765).
===== 5.1.2 (2020-02-23) =====
====== 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).
===== 5.1.1 (2020-01-07) =====
====== Bugs fixed ======
* Exception raised by Lwt_main.run upon call to exit (#758, reported Gal
Schlezinger).
===== 5.1.0 (2019-12-28) =====
====== 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).
===== 5.0.1 (2019-12-22) =====
====== Bugs fixed ======
* Additional fix for libev detection under esy (#757, Antonio Nuno Monteiro).
===== 5.0.0 (2019-12-15) =====
====== 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).
===== 4.5.0 (2019-12-15) =====
====== 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).
===== 4.4.0 (2019-10-09) =====
====== 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).
===== 4.3.1 (2019-09-26) =====
====== 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.
===== 4.3.0 (2019-08-20) =====
====== 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).
====== 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).
===== 4.2.1 (2019-04-02) =====
====== Bug fixed ======
* Detect libev correctly when building under esy (#679, Antonio Nuno
Monteiro).
===== 4.2.0 (2019-03-25) =====
====== 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 ======
* 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).
===== 4.1.0 (2018-06-26) =====
====== 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).
===== 4.0.1 (2018-04-13) =====
====== 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).
===== 4.0.0 (2018-03-30) =====
====== 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).
===== 3.3.0 (2018-03-07) =====
====== Bugs fixed ======
* Restore backtrace support (#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).
===== 3.2.1 (2018-01-11) =====
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).
===== 3.2.0 (2017-12-19) =====
====== 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).
===== 3.1.0 (2017-07-19) =====
====== 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).
===== 3.0.0 (2017-04-10) =====
====== 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).
===== 2.7.1 (2017-04-08) =====
====== Fixes ======
* OCaml 4.05 compatibility (Mauricio Fernandez, #322).
* Give Lwt_unix.file_exists the same semantics as Sys.file_exists, with
respect to not raising Unix.Unix_error (Mauricio Fernandez, #316).
* Improve diagnostics from build scripts (Tim Cuthbertson, #313, #314).
====== Additions ======
* Announce Lwt_result, which was originally released as an experimental module
in release 2.6.0 (Simon Cruanes, #320, #247).
===== 2.7.0 (2017-01-03) =====
====== 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 ======
* Ungraceful failure if directory handle used after Lwt_unix.closedir (#292).
* Buffer overflow in Lwt_unix.readdir and Lwt_unix.readdir_n (#292).
* Unnecessary allocations in Lwt_unix.readdir_n (#292, found Jeremly Yallop).
====== Miscellaneous ======
* Annotate existing deprecations with [@@ocaml.deprecated ...] (5737f5b).
* Improvements to the examples (#288, Rich Neswold).
* Documentation fixes, including by Rich Neswold.
* New tests and various minor internal improvements.
* Run tests in CI with all OCaml warnings enabled (dadb926).
* Much cleaner build output.
* Add scratch/ directory for local use by developers.
===== 2.6.0 (2016-10-27) =====
====== Additions ======
* Lwt_stream.closed and Lwt_stream.is_closed (#223, Spiros Eliopoulos).
* Lwt_switch.with_switch (#256, Thomas Leonard).
* Define 'a Lwt.result as ('a, exn) result (#247, Simon Cruanes).
* Lwt_condition.broadcast_exn (#241, Nicolas Ojeda Bar).
* Lwt_unix.utimes (#193).
====== Bugfixes ======
* Memory leak in Lwt_unix.readdir_n (#229, diagnosed Thomas Leonard).
* Memory leak in Lwt.protected (#56, #181, reported @ygrek, Mauricio
Fernandez).
* Lwt_switch.turn_off hook exception handling (995b704).
* Handling of ENOTCONN when channels passed to handler of
Lwt_io.establish_server are closed (95fb431).
* Duplicate exceptions on implicit close in Lwt_io.with_connection (b1afe45).
* Deadlock in Lwt_main.at_exit (#48, #114, reported Jérôme Vouillon, Vincent
Bernardoff).
* Performance of Lwt_preemptive.detach (#218, #219, Mauricio Fernandez).
* Bad hash functions for libev loops (#146, reported Mark Christiaens).
* Hash of uninitialized data in Lwt_io (#217, reported Jeremy Yallop).
* Update log sections after Lwt_log.load_rules (#188, reported @rand00).
* Print three digits for milliseconds in Lwt_log (#264, Fabian Hemmer).
* Do not truncate Unix job notification ids in C (#277, diagnosed
@stijn-devriendt).
====== Deprecations ======
* Lwt_stream.on_termination: bind on Lwt_stream.closed instead.
* Lwt.make_value, Lwt.make_error: use result's Ok and Error constructors.
* Lwt_pqueue, Lwt_sequence: use min-heaps and linked lists from another
library (#135).
* Pa_lwt, Pa_lwt_log: use Ppx_lwt.
====== Miscellaneous ======
* Update examples to use PPX syntax instead of Camlp4 (#108, Peter Zotov).
* Set up Travis, AppVeyor for testing on Linux, OS X, Cygwin, and MinGW. MSVC
also planned.
* Large amount of local documentation fixes (Hezekiah Carty, Etienne Millon,
Leo Wzukw, Sebastien Mondet, reports by others).
* A bunch of new tests.
===== 2.5.2 (2016-04-25) =====
* Fix compatibility for 4.03 (#227)
* Various documentation fixes (#199,#200,#210)
* Improve wildcard detection in the ppx (#198)
* Fix Lwt_stream: bounded_push#close wake the reader (#201)
* Fix infinite loop with Lwt_stream.choose (#214)
* Fix laziness failure with Lwt_io.common#close (#207)
===== 2.5.1 (2015-12-07) =====
* Lwt_stream.on_terminate -> Lwt_stream.on_termination
* Lwt_unix: handle O_CLOEXEC
* Lwt_log: add OSX syslog path
* Ppx: Improve lwt%match, improve catchall detection
* Add Lwt_unix.file_exists and Lwt_unix.Large_file.file_exists
* Build fixes
===== 2.5.0 (2015-07-03) =====
* API CHANGE: Functions in Lwt_io that were previously using a
~buffer_size argument now takes a ~buffer argument.
* Accept ?buffer argument in Lwt_ssl.{in,out}_channel_of_descr.
* Use newer Ssl bigarray read/write functionality to avoid
allocation in Lwt_ssl.
* Fix non-reentrant function calls (#136)
* IPv4 multicast support.
* Add support for if%lwt in ppx extension.
* Add Lwt.return_some.
* Disable log syntax extension by default in ppx.
Give [-log] as ppx argument to enable it.
* Nanosecond precision for Lwt_unix.stat.
* Minor fixes + documentation improvements.
===== 2.4.8 (2015-03-11) =====
* Fix compilation under Windows (#117, #129)
* Fix Lwt_engine.on_timer (#121)
* Add Lwt_log_core.reset_rules (#123)
* Fixed typos in the documentation (#119, #131)
===== 2.4.7 (2015-01-06) =====
* camlp4 is now optional.
* Add safe_string compliance except for Lwt_ssl (need ocaml-ssl fix).
* Add Lwt.Infix module to open instead of Lwt to have (>>=), etc.
* Add Lwt_list.filter_map_{s,p} functions.
* Add Lwt.fail_{with,invalid_arg} functions.
* Improved Android support.
* Remove deprecated lwt.text and lwt.top libraries.
* Remove deprecated Lwt_signal and Lwt_event modules from
lwt.react.
* Fix #111: try_lwt wrongly warns about unused match case.
* Fix #96: Fix Lwt_react.S.limit and Lwt_react.E.limit.
* Fix #91: Workaround to fix compilation on OSX.
===== 2.4.6 (2014-10-12) =====
* Add a ppx syntax extension
* Add a ?fd argument to
Lwt_io.{open_connection,with_connection,establish_server}.
* Fix stub for getaddrinfo and getprotobyname
* Windows fix: don't throw an exception in the notification handler
if we're shutting down
* Fix include file search in ./configure
* ./configure fixes for windows
* Fix: use sys_exit instead of exit when Unix.execv fails
===== 2.4.5 (2014-04-21) =====
* Lwt_ssl: expand API to allow setting socket options with Ssl
functions
* fix for camlp4 trunk
* support for React 1.0.0
* add Lwt_sequence.find_node_* functions
* Lwt_log: get backtrace early to overcome exns in
Printexc.to_string
* fix potential deadlock in lwt_unix_recv_notifications
* lwt.glib fixes:
- handle HUP
- fix for BSD/OSX
* do not raise an exception in Lwt_log if argv[0] is blank
===== 2.4.4 (2013-10-22) =====
* add Android support
* fix issues in stubs for Lwt_unix jobs
* fix compatibility issue with OCaml 4.01
* fix the stub for ev_timer_init
* add Lwt.log containing Lwt_log_core, the Unix-free part of Lwt_log
* add Lwt_ssl.get_fd
* fix stdout/stderr redirections in Lwt_daemon.daemonize
* add Lwt_list.{map,iter}i{_s,_p}
===== 2.4.3 (2012-12-27) =====
* fix Lwt_ssl.{in,out}_channel_of_descr: shutdown and close the
socket when the channel is closed
===== 2.4.2 (2012-09-28) =====
* fix the stub for Lwt_unix.readdir
* change the default method for Lwt_glib.install
(use the glib main loop by default: more portable)
* ignore invalid file descriptors returned by glib
(like the emulation of select in glib does)
* use environment variables in discover.ml
- use LIBRARY_PATH and C_INCLUDE_PATH for searching headers
- allow to pass flags for a library in <LIB>_CLFAGS and <LIB>_LIBS
* add Lwt_unix.on_signal_full
===== 2.4.1 (2012-08-22) =====
* Add Lwt_stream.on_terminate
* Fix Lwt_gc
* Fix stubs for get_credentials on *BSD
===== 2.4.0 (2012-07-16) =====
* Reimplement Lwt_stream
- much simpler and more efficient
- do not use Weak
- add bounded push streams
* Add Lwt.async
* Add Lwt_preemptive.run_in_main
* Implement Lwt_unix.get_credentials on MacOS X/OpenBSD
* Ensure that on_cancel functions are executed first
* Better implementation of Lwt.cancel with more tests
* Simplify the API for unix jobs
* Better handling of the master lock in libev stubs
* Windows fixes/updates:
- pass -lws2_32 instead of ws2_32.lib if building with mingw
- fix a bug causing Lwt_unix.read/write to block when a socket
is not readable/writable
- port Lwt_process and Lwt_unix.system to Windows
* Compatibility with OCaml 4.00:
- add O_SHARE_DELETE to Lwt_unix.open_flag
- add -package compiler-libs.toplevel for files using Toploop
* Do not use module Sys for signal handling to avoid
OCaml code to be called in a C thread
* Fix Lwt_unix.wrap_syscall: try instead of Lwt.catch
* Fix a dead-lock between lwt_unix_send_notification
and lwt_unix_recv_notifications
* Fix #277: add a function to return the Ssl.socket of a Lwt_ssl.socket
* Fix problems with C libraries detection/linking
===== 2.3.2 (2011-11-04) =====
* Add location informations in logs:
** allow loggers to get the current location through local storage
** pass current location to logging functions
** pass the current location with the syntax extension
* Add Lwt.on_termination
* Add Lwt_unix.reinstall_signal_handler
* Add Lwt_io.flush_all
* Add assert_lwt keyword to the syntax extension
* Add Lwt.wrap
* Add Lwt_glib.iter and Lwt_glib.wakeup
* OCaml 3.13 ready
* Allow to compile without libev support
* Fix bugs in Lwt_io
* Better handling of forks
* Fix many problems on Windows
===== 2.3.1 (2011-07-13) =====
* Fix building of documentation when using the tarball
* Add Lwt_unix.fsync and Lwt_unix.fdatasync
* Fix the stubs for Lwt_unix.send_msg when fd-passing is not
available
* Add -lwt-sequence-strict option to the syntax extension
* Use a custom PRNG state for Lwt.choose and Lwt.pick
* Fix a display glitch when starting the toplevel
* Add Lwt_unix.fork which should now be used when one want to use
Lwt in the child process
* Better implementation of Lwt_unix.readlink and
Lwt_unix.gethostbyname, which fixes compilation on Hurd
* Add Lwt.wakeup_later and Lwt.wakeup_later_exn to be used when one
need to do lot of nested wakeup, which fixes a buffer overflow in
Lwt_mutex
* Fix Lwt_unix.abort and Lwt_unix.close (threads was never wakeup)
* Fix Lwt_throttle for correct timings
* Fix subtle use of cancel
===== 2.3.0 (2011-04-12) =====
* Add an extensible system of engines to:
** allow the user to replace libev by another event system, such
as select
** allow easier integration of external libraries supporting
asynchronous operations
* Lots of improvements for Windows:
** use the OCaml select instead of libev by default on Windows
** make asynchronous operations on non-socket file descriptors
such as pipes to work
** make glib integration to work
* Better use of engines in Lwt_unix: now events are cached to minimize
the amount of calls to epoll_ctl
* Use an eventfd when possible for notifications for faster delivery