package lwt

  1. Overview
  2. Docs
Promises and event-driven I/O

Install

Dune Dependency

github.com Readme Changelog MIT License Edit opam file Versions (45)

Authors

  1. J
    Jérôme Vouillon
  2. J
    Jérémie Dimino

Maintainers

  1. R
    Raphaël Proust <code@bnwr.net>
  2. Anton Bachin

Sources

5.6.1.tar.gz
md5=279024789a0ec84a9d97d98bad847f97
sha512=698875bd3bfcd5baa47eb48e412f442d289f9972421321541860ebe110b9af1949c3fbc253768495726ec547fe4ba25483cd97ff39bc668496fba95b2ed9edd8

Description

A promise is a value that may become determined in the future.

Lwt provides typed, composable promises. Promises that are resolved by I/O are resolved by Lwt in parallel.

Meanwhile, OCaml code, including code creating and waiting on promises, runs in a single thread by default. This reduces the need for locks or other synchronization primitives. Code can be run in parallel on an opt-in basis.

Published: 29 Jun 2022

README

Lwt

Lwt is a concurrent programming library for OCaml. It provides a single data type: the promise, which is a value that will become determined in the future. Creating a promise spawns a computation. When that computation is I/O, Lwt runs it in parallel with your OCaml code.

OCaml code, including creating and waiting on promises, is run in a single thread by default, so you don't have to worry about locking or preemption. You can detach code to be run in separate threads on an opt-in basis.

Here is a simplistic Lwt program which requests the Google front page, and fails if the request is not completed in five seconds:

open Lwt.Syntax

let () =
  let request =
    let* addresses = Lwt_unix.getaddrinfo "google.com" "80" [] in
    let google = Lwt_unix.((List.hd addresses).ai_addr) in

    Lwt_io.(with_connection google (fun (incoming, outgoing) ->
      let* () = write outgoing "GET / HTTP/1.1\r\n" in
      let* () = write outgoing "Connection: close\r\n\r\n" in
      let* response = read incoming in
      Lwt.return (Some response)))
  in

  let timeout =
    let* () = Lwt_unix.sleep 5. in
    Lwt.return None
  in

  match Lwt_main.run (Lwt.pick [request; timeout]) with
  | Some response -> print_string response
  | None -> prerr_endline "Request timed out"; exit 1

(* ocamlfind opt -package lwt.unix -linkpkg example.ml && ./a.out *)

In the program, functions such as Lwt_io.write create promises. The let* ... in construct is used to wait for a promise to become determined; the code after in is scheduled to run in a "callback." Lwt.pick races promises against each other, and behaves as the first one to complete. Lwt_main.run forces the whole promise-computation network to be executed. All the visible OCaml code is run in a single thread, but Lwt internally uses a combination of worker threads and non-blocking file descriptors to resolve in parallel the promises that do I/O.


Overview

Lwt compiles to native code on Linux, macOS, Windows, and other systems. It's also routinely compiled to JavaScript for the front end and Node by js_of_ocaml.

In Lwt,

  • The core library Lwt provides promises...

  • ...and a few pure-OCaml helpers, such as promise-friendly mutexes, condition variables, and mvars.

  • There is a big Unix binding, Lwt_unix that binds almost every Unix system call. A higher-level module Lwt_io provides nice I/O channels.

  • Lwt_process is for subprocess handling.

  • Lwt_preemptive spawns system threads.

  • The PPX syntax allows using all of the above without going crazy!

  • There are also some other helpers, such as Lwt_react for reactive programming. See the table of contents on the linked manual pages!


Installing

  1. Use your system package manager to install a development libev package. It is often called libev-dev or libev-devel.

  2. opam install conf-libev lwt


Documentation

We are currently working on improving the Lwt documentation (drastically; we are rewriting the manual). In the meantime:

  • The current manual can be found here.

  • Mirage has a nicely-written Lwt tutorial.

  • An example of a simple server written in Lwt.

  • Concurrent Programming with Lwt is a nice source of Lwt examples. They are translations of code from the excellent Real World OCaml, but are just as useful if you are not reading the book.

Note: much of the current manual refers to 'a Lwt.t as "lightweight threads" or just "threads." This will be fixed in the new manual. 'a Lwt.t is a promise, and has nothing to do with system or preemptive threads.


Contact

Open an issue, visit Discord chat, ask on discuss.ocaml.org, or on Stack Overflow.

Release announcements are made in /r/ocaml, and on discuss.ocaml.org. Watching the repo for "Releases only" is also an option.


Contributing

  • CONTRIBUTING.md contains tips for working on the code, such as how to check the code out, how review works, etc. There is also a high-level outline of the code base.

  • Ask us anything, whether it's about working on Lwt, or any question at all about it :)

  • The documentation always needs proofreading and fixes.

  • You are welcome to pick up any other issue, review a PR, add your opinion, etc.

  • Any feedback is welcome, including how to make contributing easier!


Libraries to use with Lwt

Dependencies (5)

  1. ocplib-endian
  2. ocaml >= "4.08" & < "5.1"
  3. dune-configurator
  4. dune >= "1.8.0"
  5. cppo build & >= "1.1.0"

Dev Dependencies (1)

  1. ocamlfind dev & >= "1.7.3-1"

  1. 0install >= "2.15.1"
  2. aches-lwt
  3. albatross
  4. alcotest-lwt
  5. alcotest-mirage
  6. ambient-context-lwt
  7. amqp-client >= "0.9.0" & < "1.0.2" | >= "1.1.0"
  8. amqp-client-lwt >= "2.0.1"
  9. angstrom-lwt-unix >= "0.11.0"
  10. anthill
  11. anycache-lwt
  12. arakoon < "1.8.6" | >= "1.8.8"
  13. archi-lwt
  14. arp >= "2.3.1"
  15. arp-mirage >= "2.2.1"
  16. awa-lwt
  17. awa-mirage
  18. aws-lwt
  19. aws-s3-lwt
  20. awsm-lwt
  21. azure-cosmos-db
  22. baardskeerder
  23. balancer
  24. bap < "1.0.0"
  25. bap-server < "0.2.0"
  26. bastet_lwt
  27. bimage-lwt
  28. biocaml = "0.4.0"
  29. bistro >= "0.4.0"
  30. brozip
  31. builder
  32. builder-web
  33. bun >= "0.3.3"
  34. c3
  35. calculon
  36. caldav
  37. camltc = "0.9.5" | >= "0.9.7.0"
  38. canary
  39. capnp-rpc-lwt
  40. capnp-rpc-unix >= "0.9.0"
  41. caqti-lwt >= "0.11.0"
  42. caqti-mirage
  43. carton
  44. carton-git < "0.7.2"
  45. carton-lwt
  46. cf-lwt
  47. chamelon
  48. chamelon-unix
  49. chamo >= "3.0"
  50. channel
  51. charrua-client >= "1.3.0"
  52. charrua-client-lwt
  53. charrua-client-mirage
  54. charrua-core < "0.3"
  55. charrua-unix >= "0.3" & != "0.10"
  56. clz
  57. cmdtui-lambda-term
  58. coclobas
  59. cohttp-curl-lwt
  60. cohttp-lwt
  61. cohttp-lwt-jsoo
  62. cohttp-lwt-unix >= "1.1.1"
  63. cohttp-lwt-unix-nossl
  64. cohttp-lwt-unix-ssl
  65. cohttp-mirage
  66. cohttp-server-lwt-unix
  67. comby
  68. comby-semantic
  69. conan-lwt
  70. conduit-lwt
  71. conduit-lwt-unix
  72. cowabloga >= "0.2.2"
  73. crunch >= "2.0.0"
  74. cstruct-lwt
  75. csv-lwt
  76. csvprovider
  77. ctypes >= "0.15.0" & < "0.21.1"
  78. ctypes-foreign >= "0.21.1"
  79. current
  80. current-albatross-deployer
  81. current_docker
  82. current_examples
  83. current_git
  84. current_github
  85. current_gitlab
  86. current_ocluster
  87. current_rpc >= "0.4"
  88. current_slack
  89. current_web
  90. DkSDKFFIOCaml_Std
  91. dap
  92. data-encoding < "0.1.1"
  93. datakit
  94. datakit-bridge-github
  95. datakit-bridge-local-git
  96. datakit-ci
  97. datakit-client = "0.11.0"
  98. datakit-github
  99. devkit >= "1.2"
  100. dht < "0.2.0"
  101. distributed-lwt
  102. dkim-bin >= "0.6.0"
  103. dkim-mirage
  104. dlm
  105. dns >= "0.19.1" & < "0.20.1"
  106. dns-certify
  107. dns-cli >= "4.6.3"
  108. dns-client < "7.0.0"
  109. dns-client-lwt
  110. dns-client-mirage
  111. dns-forward >= "0.9.0"
  112. dns-forward-lwt-unix
  113. dns-lwt
  114. dns-mirage
  115. dns-resolver
  116. dns-server
  117. dns-stub
  118. dnssd
  119. docker_hub
  120. docteur >= "0.0.2"
  121. docteur-solo5
  122. docteur-unix >= "0.0.5"
  123. doi2bib
  124. dream
  125. dream-httpaf
  126. dream-pure
  127. dream-serve
  128. dropbox
  129. dune-rpc-lwt
  130. dune_watch
  131. earlybird
  132. elasticsearch-cli >= "0.4"
  133. equinoxe
  134. eris-lwt
  135. ethernet
  136. ez_api >= "1.2.0"
  137. ezcurl-lwt
  138. ezirmin
  139. ezjs_min < "0.2"
  140. ezjsonm >= "0.4.2" & < "0.5.0"
  141. ezjsonm-lwt
  142. ezresto
  143. ezresto-directory >= "0.5"
  144. faraday-lwt
  145. faraday-lwt-unix >= "0.6.0"
  146. fat-filesystem >= "0.12.0"
  147. fiber-lwt
  148. flowtype >= "0.72.0"
  149. frenetic < "2.0.0"
  150. fsevents-lwt
  151. fswatch_lwt
  152. fuseau-lwt
  153. gamepad
  154. gdb
  155. gdbprofiler >= "0.3"
  156. git != "1.4.3" & != "1.7.2"
  157. git-cohttp
  158. git-cohttp-mirage
  159. git-cohttp-unix
  160. git-mirage >= "3.0.0"
  161. git-paf
  162. git-unix = "1.11.1" | >= "3.0.0"
  163. github
  164. github-hooks < "0.2.0" | >= "0.4.0"
  165. github-unix >= "4.4.0"
  166. gitlab-unix
  167. gitlab_pipeline_notifier
  168. gluten-lwt
  169. gluten-lwt-unix < "0.4.0"
  170. gluten-mirage < "0.4.0"
  171. graphql-lwt
  172. gremlin
  173. grpc-lwt
  174. guardian
  175. gufo
  176. h2-lwt
  177. h2-lwt-unix < "0.10.0"
  178. h2-mirage
  179. happy-eyeballs-lwt
  180. happy-eyeballs-mirage
  181. hardcaml < "1.1.0"
  182. hardcaml-examples >= "0.3.0"
  183. hardcaml-framework
  184. hiredis != "0.4"
  185. hl_yaml
  186. hockmd
  187. horned_worm < "0.3.1"
  188. http-lwt-client
  189. http-mirage-client
  190. http-multipart-formdata >= "2.0.0" & < "3.0.0"
  191. http2https
  192. httpaf-lwt-unix
  193. httpun-lwt
  194. httpun-mirage
  195. httpun-ws-lwt
  196. hvsock >= "1.0.2"
  197. i3ipc >= "0.1.4"
  198. imaplet-lwt
  199. influxdb-lwt
  200. inotify >= "2.4"
  201. inquire < "0.3.0"
  202. interface-prime-lwt
  203. iocaml < "0.4.6"
  204. iocaml-kernel >= "0.4.3" & < "0.4.6"
  205. iocamljs-kernel
  206. ip2location
  207. ip2locationio
  208. ip2whois
  209. ipv6-multicast-lwt
  210. irc-client-lwt
  211. irc-client-lwt-ssl
  212. irc-client-tls
  213. irmin < "0.9.6" | = "0.9.10" | >= "0.11.0"
  214. irmin-bench
  215. irmin-chunk
  216. irmin-cli
  217. irmin-containers
  218. irmin-fs >= "2.3.0"
  219. irmin-git >= "2.3.0"
  220. irmin-graphql >= "2.3.0"
  221. irmin-http >= "2.3.0"
  222. irmin-indexeddb
  223. irmin-layers
  224. irmin-mem >= "2.3.0"
  225. irmin-mirage-git >= "2.3.0"
  226. irmin-mirage-graphql >= "2.3.0"
  227. irmin-pack
  228. irmin-server
  229. irmin-test >= "2.3.0"
  230. irmin-unix >= "2.3.0"
  231. irmin-watcher >= "0.3.0"
  232. jerboa
  233. jitsu
  234. joolog
  235. jose < "0.9.0"
  236. js_of_ocaml < "2.5"
  237. js_of_ocaml-lwt >= "3.5.0"
  238. jsoo_broadcastchannel
  239. jsoo_router
  240. jsoo_storage
  241. jupyter >= "2.3.0"
  242. jupyter-kernel >= "0.4"
  243. kafka >= "0.3" & < "0.5"
  244. kafka_lwt
  245. kappa-library
  246. ke >= "0.5"
  247. ketrew >= "3.2.0"
  248. kinetic-client < "0.0.3" | >= "0.0.9"
  249. kubecaml
  250. lablqml < "0.6"
  251. lambda-runtime
  252. lambda-term >= "1.13"
  253. lambda_streams_lwt
  254. launchd
  255. ldp
  256. learn-ocaml >= "0.13.0"
  257. learn-ocaml-client >= "0.13.0"
  258. letsencrypt
  259. letsencrypt-app
  260. letsencrypt-dns
  261. letters
  262. libres3
  263. links != "0.9"
  264. linol-lwt
  265. llama
  266. lru_cache < "v0.16.0"
  267. lwt-binio < "0.2.0"
  268. lwt-canceler
  269. lwt-dllist
  270. lwt-exit
  271. lwt-parallel >= "1.0.0"
  272. lwt-pipe
  273. lwt-pipeline
  274. lwt-watcher
  275. lwt-zmq < "1.0.0"
  276. lwt_camlp4
  277. lwt_domain
  278. lwt_eio < "0.4"
  279. lwt_glib >= "1.0.1"
  280. lwt_log >= "1.1.0"
  281. lwt_ppx
  282. lwt_ppx_let
  283. lwt_react >= "1.0.1"
  284. lwt_ssl >= "1.0.1"
  285. mariadb < "0.5.1"
  286. markup = "0.7.6"
  287. markup-lwt
  288. mdx
  289. mechaml
  290. mehari-lwt-unix
  291. mehari-mirage
  292. memtrace-mirage
  293. metrics-influx
  294. metrics-lwt
  295. metrics-mirage
  296. metrics-unix
  297. mimic
  298. mindstorm-lwt
  299. mirage >= "0.4.1" & != "0.6.1" & < "0.8.0" | >= "0.10.0" & < "2.7.0"
  300. mirage-block < "1.0.0" | >= "2.0.0"
  301. mirage-block-ccm
  302. mirage-block-combinators
  303. mirage-block-lwt
  304. mirage-block-partition
  305. mirage-block-ramdisk
  306. mirage-block-solo5
  307. mirage-block-unix < "2.3.0" | = "2.8.2" | >= "2.13.0"
  308. mirage-block-xen
  309. mirage-bootvar-solo5 >= "0.2.0"
  310. mirage-bootvar-unix
  311. mirage-bootvar-xen >= "0.4.0"
  312. mirage-channel >= "4.0.0"
  313. mirage-channel-lwt
  314. mirage-clock-freestanding < "3.0.0"
  315. mirage-clock-lwt
  316. mirage-clock-unix >= "1.3.0" & < "3.0.0"
  317. mirage-console >= "3.0.0"
  318. mirage-console-lwt
  319. mirage-console-solo5 >= "0.2.0"
  320. mirage-console-unix >= "2.2.1"
  321. mirage-console-xen >= "5.0.0"
  322. mirage-console-xen-backend
  323. mirage-console-xen-cli
  324. mirage-crypto-entropy
  325. mirage-crypto-rng >= "0.7.0" & < "0.11.0"
  326. mirage-crypto-rng-lwt
  327. mirage-crypto-rng-mirage >= "0.8.8"
  328. mirage-device >= "2.0.0"
  329. mirage-dns < "3.0.0"
  330. mirage-entropy
  331. mirage-flow >= "1.0.3" & < "1.2.0" | >= "2.0.0"
  332. mirage-flow-combinators
  333. mirage-flow-lwt < "1.3.0" | >= "1.5.0"
  334. mirage-flow-rawlink
  335. mirage-flow-unix >= "1.3.0"
  336. mirage-fs >= "3.0.0"
  337. mirage-fs-lwt
  338. mirage-fs-unix < "1.1.1" | >= "1.3.0"
  339. mirage-http
  340. mirage-http-unix
  341. mirage-http-xen
  342. mirage-kv >= "3.0.0"
  343. mirage-kv-lwt
  344. mirage-kv-unix < "3.0.1"
  345. mirage-logs != "0.3.0"
  346. mirage-nat < "3.0.0"
  347. mirage-net >= "3.0.1"
  348. mirage-net-fd
  349. mirage-net-lwt
  350. mirage-net-macosx
  351. mirage-net-solo5
  352. mirage-net-unix >= "2.2.0"
  353. mirage-net-xen
  354. mirage-os-shim >= "3.0.0"
  355. mirage-profile
  356. mirage-protocols >= "4.0.0" & < "8.0.0"
  357. mirage-protocols-lwt
  358. mirage-qubes < "0.2" | >= "0.4" & < "0.9.4"
  359. mirage-qubes-ipv4 < "0.9.4"
  360. mirage-random-stdlib >= "0.1.0"
  361. mirage-runtime >= "3.7.0"
  362. mirage-solo5
  363. mirage-stack >= "2.0.0" & < "4.0.0"
  364. mirage-stack-lwt
  365. mirage-time >= "2.0.0"
  366. mirage-time-lwt
  367. mirage-time-unix
  368. mirage-types-lwt < "3.7.1"
  369. mirage-unix >= "3.0.0"
  370. mirage-vnetif
  371. mirage-vnetif-stack
  372. mirage-www >= "1.1.0"
  373. mirage-xen
  374. mirror
  375. monorobot
  376. moonpool-lwt
  377. mqtt = "0.0.2"
  378. mrmime >= "0.5.0"
  379. multipart-form-data >= "0.2.0"
  380. multipart_form >= "0.2.0" & < "0.4.0"
  381. multipart_form-cohttp-lwt < "0.6.0"
  382. multipart_form-lwt
  383. mwt
  384. naboris
  385. nanomsg
  386. nbd = "2.1.1" | >= "4.0.3"
  387. nbd-tool
  388. nbd-unix
  389. netchannel
  390. nocrypto >= "0.5.4"
  391. nottui-lwt
  392. nproc
  393. nsq >= "0.4.0"
  394. obrowser
  395. obuilder
  396. obus >= "1.2.1"
  397. ocaml-variants >= "4.00.1+mirage-unix" & < "4.00.1+open-types"
  398. ocluster
  399. ocluster-api
  400. ocluster-worker
  401. ocplib-concur
  402. ocplib-resto
  403. ocsigen-start >= "4.1.0" & < "4.7.0"
  404. ocsigenserver >= "2.10"
  405. ocsipersist
  406. ocsipersist-dbm
  407. ocsipersist-lib
  408. ocsipersist-pgsql
  409. ocsipersist-sqlite
  410. octez-distributed-lwt-internal < "19.0"
  411. octez-l2-libs < "19.0"
  412. octez-libs < "19.0"
  413. octez-proto-libs < "19.0"
  414. octez-protocol-compiler < "19.0"
  415. octez-proxy-server < "19.0"
  416. octez-shell-libs < "19.0"
  417. octez-smart-rollup-wasm-benchmark-lib
  418. odoc >= "2.0.0" & < "2.1.0"
  419. oframl
  420. ojquery
  421. ojs-base
  422. ojs_base
  423. omigrate
  424. oneffs
  425. opam-compiler < "0.2.0"
  426. opam-sync-github-prs
  427. openflow < "0.2.0"
  428. opentelemetry-client-cohttp-lwt
  429. opentelemetry-cohttp-lwt >= "0.4"
  430. opentelemetry-lwt
  431. opium >= "0.11.0" & != "0.16.0"
  432. opium-graphql
  433. opium_kernel
  434. opomodoro
  435. order-i3-xfce
  436. ordma >= "0.0.3"
  437. oskel >= "0.3.0"
  438. ounit-lwt < "2.2.0"
  439. ounit2-lwt
  440. owork
  441. ox < "1.1.0"
  442. ozulip
  443. paf
  444. paf-cohttp
  445. passage
  446. pcap-format >= "0.3.3" & < "0.5.0"
  447. petrol
  448. pgx_lwt
  449. pgx_lwt_mirage
  450. pgx_lwt_unix < "2.0"
  451. piaf
  452. plebeia >= "2.0.0"
  453. plist-xml-lwt
  454. plotkicadsch >= "0.4.0"
  455. ppx_defer >= "0.4.0"
  456. ppx_deriving_rpc
  457. ppx_json_types
  458. ppx_netblob
  459. ppx_rapper_lwt
  460. ppx_sqlexpr
  461. proc-smaps
  462. prof_spacetime
  463. prometheus
  464. prometheus-app
  465. promise_jsoo_lwt
  466. protocol-9p >= "0.10.0"
  467. protocol-9p-unix
  468. qcow >= "0.8.1"
  469. qcow-format < "0.3"
  470. qcow-tool
  471. qfs = "0.5" | >= "0.7"
  472. quests
  473. rawlink >= "1.0" & < "2.1"
  474. rawlink-lwt
  475. rdf_json_ld < "1.0.0"
  476. rdf_lwt < "1.0.0"
  477. redis-lwt
  478. reparse-lwt
  479. reparse-lwt-unix
  480. resource-pooling >= "0.3.2"
  481. resp
  482. resp-mirage >= "0.10.0"
  483. resp-unix >= "0.10.0"
  484. resto
  485. resto-cohttp-client >= "0.4"
  486. resto-cohttp-self-serving-client
  487. resto-cohttp-server >= "0.4" & < "0.6" | >= "0.9"
  488. resto-directory >= "0.4"
  489. riak
  490. ringo-lwt
  491. river
  492. rock
  493. rpc >= "1.5.1" & < "7.1.0"
  494. rpclib-js
  495. rpclib-lwt
  496. SZXX < "4.0.0"
  497. sanddb
  498. scgi
  499. sendmail-lwt
  500. serial
  501. server-reason-react
  502. session-cohttp-lwt
  503. session-cookie-lwt
  504. session-postgresql-lwt >= "0.4.1"
  505. sessions
  506. shared-block-ring < "2.3.0" | >= "3.0.0"
  507. shared-memory-ring >= "1.2.0" & < "2.0.0"
  508. shared-memory-ring-lwt
  509. sihl < "0.2.0"
  510. slack
  511. slacko
  512. slipshow
  513. socket-daemon < "0.3.0"
  514. speed
  515. spin < "0.8.0"
  516. spoke
  517. spotify-web-api < "0.2.1"
  518. sqlexpr = "0.7.1" | >= "0.9.0"
  519. statsd-client
  520. stk
  521. stog >= "0.16.0" & < "1.0.0"
  522. syguslib-utils
  523. syndic >= "1.4" & < "1.6.0"
  524. tar-format >= "0.4.1"
  525. tar-mirage
  526. tar-unix < "3.0.0"
  527. tcpip >= "3.1.1" & < "3.4.1" | >= "4.1.0"
  528. teash
  529. telegraml
  530. terminus
  531. tezos-base >= "13.0"
  532. tezos-clic >= "13.0"
  533. tezos-crypto >= "13.0"
  534. tezos-crypto-dal
  535. tezos-error-monad >= "8.0" & < "9.0" | >= "13.0"
  536. tezos-lwt-result-stdlib >= "9.0"
  537. tezos-p2p >= "11.0" & < "13.0"
  538. tezos-protocol-compiler >= "13.0"
  539. tezos-protocol-environment >= "13.0"
  540. tezos-proxy >= "17.1"
  541. tezos-proxy-server
  542. tezos-stdlib
  543. tezos-stdlib-unix >= "8.0" & < "9.0" | >= "13.0"
  544. tezos-test-helpers >= "12.0"
  545. tezos-wasmer
  546. tezos-webassembly-interpreter-extra
  547. tezt
  548. tftp
  549. themoviedb
  550. tidy_email
  551. tls = "0.10.1" | >= "0.10.6" & < "0.16.0"
  552. tls-lwt < "0.17.4"
  553. tls-mirage
  554. transmission-rpc
  555. tube >= "4.3.0"
  556. tuntap >= "1.0.0" & < "1.7.0" | >= "2.0.0"
  557. twirp_cohttp_lwt_unix
  558. typerex-lldb
  559. u2f
  560. uring
  561. uspf
  562. uspf-lwt
  563. utop >= "1.4.0"
  564. uwt >= "0.3.0"
  565. vchan >= "0.9.7" & < "2.0.0" | >= "2.0.3"
  566. vchan-unix
  567. vchan-xen
  568. vercel
  569. vhd-format >= "0.7.0" & < "0.8.0"
  570. vhd-format-lwt >= "0.12.0"
  571. vhd-tool < "0.12.0"
  572. vmnet >= "1.3.2"
  573. vpnkit >= "0.2.0"
  574. vue-jsoo < "0.3"
  575. wayland < "2.0"
  576. webauthn
  577. websocket < "2.3"
  578. xe-unikernel-upload
  579. xen-api-client < "0.9.14"
  580. xen-block-driver
  581. xen-evtchn < "1.0.6" | >= "2.0.0"
  582. xen-evtchn-unix
  583. xen-gnt >= "2.2.3"
  584. xen-gnt-unix >= "4.0.2"
  585. xenctrl < "0.9.29" | >= "0.9.32"
  586. xenstore >= "1.3.0"
  587. xenstore_transport >= "1.0.0"
  588. xentropyd
  589. yocaml_git
  590. yocaml_unix
  591. yurt < "0.3"
  592. zmq-lwt

Conflicts

None

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