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

5.7.0.tar.gz
md5=737039d29d45b2d2b35db6931c8d75c6
sha512=42e629920783428673b99c9d7a639237c9e6b35079b5d907bc67e7ea506acf9edadc48cec580bdcfd2410ed9412bf5e6bcc8b09de2fa7d35ce1490973d05ddd1

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: 17 Aug 2023

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"
  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 < "4.4.0" | >= "4.8.1"
  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
  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. coap
  59. coap-server-lwt
  60. coclobas
  61. cohttp-curl-lwt
  62. cohttp-lwt
  63. cohttp-lwt-jsoo
  64. cohttp-lwt-unix >= "1.1.1"
  65. cohttp-lwt-unix-nossl
  66. cohttp-lwt-unix-ssl
  67. cohttp-mirage
  68. cohttp-server-lwt-unix
  69. comby
  70. comby-semantic
  71. conan-lwt
  72. conduit-lwt
  73. conduit-lwt-unix
  74. cowabloga >= "0.2.2"
  75. crunch >= "2.0.0"
  76. cstruct-lwt
  77. csv-lwt
  78. csvprovider
  79. ctypes >= "0.15.0" & < "0.21.1"
  80. ctypes-foreign >= "0.21.1"
  81. current
  82. current-albatross-deployer
  83. current_docker
  84. current_examples
  85. current_git
  86. current_github
  87. current_gitlab
  88. current_ocluster
  89. current_rpc >= "0.4"
  90. current_slack
  91. current_web
  92. DkSDKFFIOCaml_Std
  93. dap
  94. data-encoding < "0.1.1"
  95. datakit
  96. datakit-bridge-github
  97. datakit-bridge-local-git
  98. datakit-ci
  99. datakit-client = "0.11.0"
  100. datakit-github
  101. devkit >= "1.2"
  102. dht < "0.2.0"
  103. distributed-lwt
  104. dkim-mirage
  105. dlm
  106. dns >= "0.19.1" & < "0.20.1"
  107. dns-certify
  108. dns-cli >= "4.6.3"
  109. dns-client < "7.0.0"
  110. dns-client-lwt
  111. dns-client-mirage
  112. dns-forward >= "0.9.0"
  113. dns-forward-lwt-unix
  114. dns-lwt
  115. dns-mirage
  116. dns-resolver
  117. dns-server
  118. dns-stub
  119. dnssd
  120. docker_hub
  121. docteur >= "0.0.2"
  122. docteur-solo5
  123. docteur-unix >= "0.0.5"
  124. doi2bib
  125. dream
  126. dream-httpaf
  127. dream-pure
  128. dream-serve
  129. dropbox
  130. dune-rpc-lwt >= "3.7.0" & != "3.10.0"
  131. dune_watch
  132. earlybird
  133. elasticsearch-cli >= "0.4"
  134. equinoxe
  135. eris-lwt
  136. ethernet
  137. ez_api >= "1.2.0"
  138. ezcurl-lwt
  139. ezirmin
  140. ezjs_min < "0.2"
  141. ezjsonm >= "0.4.2" & < "0.5.0"
  142. ezjsonm-lwt
  143. ezresto
  144. ezresto-directory >= "0.5"
  145. faraday-lwt
  146. faraday-lwt-unix >= "0.6.0"
  147. fat-filesystem >= "0.12.0"
  148. fiber-lwt
  149. flowtype >= "0.72.0"
  150. frenetic < "2.0.0"
  151. fsevents-lwt
  152. fswatch_lwt
  153. fuseau-lwt
  154. gamepad
  155. gdb
  156. gdbprofiler >= "0.3"
  157. git != "1.4.3" & != "1.7.2"
  158. git-cohttp
  159. git-cohttp-mirage
  160. git-cohttp-unix
  161. git-mirage >= "3.0.0"
  162. git-paf
  163. git-unix = "1.11.1" | >= "3.0.0"
  164. github
  165. github-hooks < "0.2.0" | >= "0.4.0"
  166. github-unix >= "4.4.0"
  167. gitlab-unix
  168. gitlab_pipeline_notifier
  169. gluten-lwt
  170. gluten-lwt-unix < "0.4.0"
  171. gluten-mirage < "0.4.0"
  172. graphql-lwt
  173. gremlin
  174. grpc-lwt
  175. guardian
  176. gufo
  177. h2-lwt
  178. h2-lwt-unix < "0.10.0"
  179. h2-mirage
  180. happy-eyeballs-lwt
  181. happy-eyeballs-mirage
  182. hardcaml < "1.1.0"
  183. hardcaml-examples >= "0.3.0"
  184. hardcaml-framework
  185. hidapi-lwt
  186. hiredis != "0.4"
  187. hl_yaml
  188. hockmd
  189. horned_worm < "0.3.1"
  190. http-lwt-client
  191. http-mirage-client
  192. http-multipart-formdata >= "2.0.0" & < "3.0.0"
  193. http2https
  194. httpaf-lwt-unix
  195. hvsock >= "1.0.2"
  196. i3ipc >= "0.1.4"
  197. imaplet-lwt
  198. influxdb-lwt
  199. inotify >= "2.4"
  200. inquire < "0.3.0"
  201. interface-prime-lwt
  202. iocaml < "0.4.6"
  203. iocaml-kernel >= "0.4.3" & < "0.4.6"
  204. iocamljs-kernel
  205. ip2location
  206. ip2locationio
  207. ipv6-multicast-lwt
  208. irc-client-lwt
  209. irc-client-lwt-ssl
  210. irc-client-tls
  211. irmin < "0.9.6" | = "0.9.10" | >= "0.11.0"
  212. irmin-bench
  213. irmin-chunk
  214. irmin-cli
  215. irmin-client
  216. irmin-containers
  217. irmin-fs >= "2.3.0"
  218. irmin-git >= "2.3.0"
  219. irmin-graphql >= "2.3.0"
  220. irmin-http >= "2.3.0"
  221. irmin-indexeddb
  222. irmin-layers
  223. irmin-mem >= "2.3.0"
  224. irmin-mirage-git >= "2.3.0"
  225. irmin-mirage-graphql >= "2.3.0"
  226. irmin-pack
  227. irmin-server
  228. irmin-test >= "2.3.0"
  229. irmin-unix >= "2.3.0"
  230. irmin-watcher >= "0.3.0"
  231. jerboa
  232. jitsu
  233. joolog
  234. jose < "0.9.0"
  235. js_of_ocaml < "2.5"
  236. js_of_ocaml-lwt >= "3.5.0"
  237. jsoo_broadcastchannel
  238. jsoo_router
  239. jsoo_storage
  240. jupyter >= "2.3.0"
  241. jupyter-kernel >= "0.4"
  242. kafka >= "0.3" & < "0.5"
  243. kafka_lwt
  244. kappa-library
  245. ke >= "0.5"
  246. ketrew >= "3.2.0"
  247. kinetic-client < "0.0.3" | >= "0.0.9"
  248. kubecaml
  249. lablqml < "0.6"
  250. lambda-runtime
  251. lambda-term >= "1.13"
  252. lambda_streams_lwt
  253. launchd
  254. ldp
  255. learn-ocaml >= "0.13.0"
  256. learn-ocaml-client >= "0.13.0"
  257. ledgerwallet >= "0.4.0"
  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
  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
  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"
  359. mirage-qubes-ipv4
  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. ocsigenserver >= "2.10"
  404. ocsipersist
  405. ocsipersist-dbm
  406. ocsipersist-lib
  407. ocsipersist-pgsql
  408. ocsipersist-sqlite
  409. octez-distributed-lwt-internal
  410. octez-l2-libs
  411. octez-libs
  412. octez-proto-libs
  413. octez-protocol-compiler
  414. octez-proxy-server
  415. octez-rpc-process
  416. octez-shell-libs
  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-sync-github-prs
  426. openflow < "0.2.0"
  427. opentelemetry-client-cohttp-lwt
  428. opentelemetry-cohttp-lwt >= "0.4"
  429. opentelemetry-lwt
  430. opium >= "0.11.0" & != "0.16.0"
  431. opium-graphql
  432. opium_kernel
  433. opomodoro
  434. order-i3-xfce
  435. ordma >= "0.0.3"
  436. oskel >= "0.3.0"
  437. ounit-lwt < "2.2.0"
  438. ounit2-lwt
  439. owork
  440. ox < "1.1.0"
  441. ozulip
  442. paf
  443. paf-cohttp
  444. pcap-format >= "0.3.3" & < "0.5.0"
  445. petrol
  446. pgx_lwt
  447. pgx_lwt_mirage
  448. pgx_lwt_unix < "2.0"
  449. piaf
  450. plebeia >= "2.0.0"
  451. plist-xml-lwt
  452. plotkicadsch >= "0.4.0"
  453. ppx_defer >= "0.4.0"
  454. ppx_deriving_rpc
  455. ppx_json_types
  456. ppx_netblob
  457. ppx_rapper_lwt
  458. ppx_sqlexpr
  459. proc-smaps
  460. prof_spacetime
  461. prometheus
  462. prometheus-app
  463. promise_jsoo_lwt
  464. protocol-9p >= "0.10.0"
  465. protocol-9p-unix
  466. qcow >= "0.8.1"
  467. qcow-format < "0.3"
  468. qcow-tool
  469. qfs = "0.5" | >= "0.7"
  470. quests
  471. rawlink >= "1.0" & < "2.1"
  472. rawlink-lwt
  473. rdf_json_ld
  474. rdf_lwt
  475. redis-lwt
  476. reparse-lwt
  477. reparse-lwt-unix
  478. resource-pooling >= "0.3.2"
  479. resp
  480. resp-mirage >= "0.10.0"
  481. resp-unix >= "0.10.0"
  482. resto
  483. resto-cohttp-client >= "0.4"
  484. resto-cohttp-self-serving-client
  485. resto-cohttp-server >= "0.4" & < "0.6" | >= "0.9"
  486. resto-directory >= "0.4"
  487. riak
  488. ringo-lwt
  489. river
  490. rock
  491. rpc >= "1.5.1" & < "7.1.0"
  492. rpclib-js
  493. rpclib-lwt
  494. SZXX < "4.0.0"
  495. sanddb
  496. scgi
  497. sendmail-lwt
  498. serial
  499. server-reason-react
  500. session-cohttp-lwt
  501. session-cookie-lwt
  502. session-postgresql-lwt >= "0.4.1"
  503. sessions
  504. shared-block-ring < "2.3.0" | >= "3.0.0"
  505. shared-memory-ring >= "1.2.0" & < "2.0.0"
  506. shared-memory-ring-lwt
  507. sherlodoc
  508. sihl < "0.2.0"
  509. slack
  510. slacko
  511. socket-daemon < "0.3.0"
  512. spin < "0.8.0"
  513. spoke
  514. spotify-web-api < "0.2.1"
  515. sqlexpr = "0.7.1" | >= "0.9.0"
  516. statsd-client
  517. stk
  518. stog >= "0.16.0"
  519. syguslib-utils
  520. syndic >= "1.4" & < "1.6.0"
  521. tar-format >= "0.4.1"
  522. tar-mirage
  523. tar-unix
  524. tcpip >= "3.1.1" & < "3.4.1" | >= "4.1.0"
  525. teash
  526. telegraml
  527. terminus
  528. tezos-base >= "13.0"
  529. tezos-clic >= "13.0"
  530. tezos-crypto >= "13.0"
  531. tezos-crypto-dal
  532. tezos-error-monad >= "8.0" & < "9.0" | >= "13.0"
  533. tezos-lwt-result-stdlib >= "9.0"
  534. tezos-p2p >= "11.0" & < "13.0"
  535. tezos-protocol-compiler >= "13.0"
  536. tezos-protocol-environment >= "13.0"
  537. tezos-proxy >= "17.1"
  538. tezos-proxy-server
  539. tezos-stdlib
  540. tezos-stdlib-unix >= "8.0" & < "9.0" | >= "13.0"
  541. tezos-test-helpers >= "12.0"
  542. tezos-wasmer
  543. tezos-webassembly-interpreter-extra
  544. tezt
  545. tftp
  546. themoviedb
  547. tidy_email
  548. tls = "0.10.1" | >= "0.10.6" & < "0.16.0"
  549. tls-lwt
  550. tls-mirage
  551. transmission-rpc
  552. tube >= "4.3.0"
  553. tuntap >= "1.0.0" & < "1.7.0" | >= "2.0.0"
  554. typerex-lldb
  555. u2f
  556. uring
  557. uspf
  558. uspf-lwt
  559. utop >= "1.4.0"
  560. uwt >= "0.3.0"
  561. vchan >= "0.9.7" & < "2.0.0" | >= "2.0.3"
  562. vchan-unix
  563. vchan-xen
  564. vercel
  565. vhd-format >= "0.7.0" & < "0.8.0"
  566. vhd-format-lwt >= "0.12.0"
  567. vhd-tool < "0.12.0"
  568. vmnet >= "1.3.2"
  569. vpnkit >= "0.2.0"
  570. vue-jsoo < "0.3"
  571. wayland < "2.0"
  572. webauthn
  573. websocket < "2.3"
  574. xe-unikernel-upload
  575. xen-api-client < "0.9.14"
  576. xen-block-driver
  577. xen-evtchn < "1.0.6" | >= "2.0.0"
  578. xen-evtchn-unix
  579. xen-gnt >= "2.2.3"
  580. xenctrl < "0.9.29" | >= "0.9.32"
  581. xenstore >= "1.3.0"
  582. xenstore_transport >= "1.0.0"
  583. xentropyd
  584. yocaml_git
  585. yocaml_unix
  586. yurt < "0.3"
  587. zmq-lwt >= "5.2.1"

Conflicts

None