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-bin >= "0.6.0"
  105. dkim-mirage
  106. dlm
  107. dns >= "0.19.1" & < "0.20.1"
  108. dns-certify
  109. dns-cli >= "4.6.3"
  110. dns-client < "7.0.0"
  111. dns-client-lwt
  112. dns-client-mirage
  113. dns-forward >= "0.9.0"
  114. dns-forward-lwt-unix
  115. dns-lwt
  116. dns-mirage
  117. dns-resolver
  118. dns-server
  119. dns-stub
  120. dnssd
  121. docker_hub
  122. docteur >= "0.0.2"
  123. docteur-solo5
  124. docteur-unix >= "0.0.5"
  125. doi2bib
  126. dream
  127. dream-httpaf
  128. dream-pure
  129. dream-serve
  130. dropbox
  131. dune-rpc-lwt >= "3.7.0" & != "3.10.0"
  132. dune_watch
  133. earlybird
  134. elasticsearch-cli >= "0.4"
  135. equinoxe
  136. eris-lwt
  137. ethernet
  138. ez_api >= "1.2.0"
  139. ezcurl-lwt
  140. ezirmin
  141. ezjs_min < "0.2"
  142. ezjsonm >= "0.4.2" & < "0.5.0"
  143. ezjsonm-lwt
  144. ezresto
  145. ezresto-directory >= "0.5"
  146. faraday-lwt
  147. faraday-lwt-unix >= "0.6.0"
  148. fat-filesystem >= "0.12.0"
  149. fiber-lwt
  150. flowtype >= "0.72.0"
  151. frenetic < "2.0.0"
  152. fsevents-lwt
  153. fswatch_lwt
  154. fuseau-lwt
  155. gamepad
  156. gdb
  157. gdbprofiler >= "0.3"
  158. git != "1.4.3" & != "1.7.2"
  159. git-cohttp
  160. git-cohttp-mirage
  161. git-cohttp-unix
  162. git-mirage >= "3.0.0"
  163. git-paf
  164. git-unix = "1.11.1" | >= "3.0.0"
  165. github
  166. github-hooks < "0.2.0" | >= "0.4.0"
  167. github-unix >= "4.4.0"
  168. gitlab-unix
  169. gitlab_pipeline_notifier
  170. gluten-lwt
  171. gluten-lwt-unix < "0.4.0"
  172. gluten-mirage < "0.4.0"
  173. graphql-lwt
  174. gremlin
  175. grpc-lwt
  176. guardian
  177. gufo
  178. h2-lwt
  179. h2-lwt-unix < "0.10.0"
  180. h2-mirage
  181. happy-eyeballs-lwt
  182. happy-eyeballs-mirage
  183. hardcaml < "1.1.0"
  184. hardcaml-examples >= "0.3.0"
  185. hardcaml-framework
  186. hidapi-lwt
  187. hiredis != "0.4"
  188. hl_yaml
  189. hockmd
  190. horned_worm < "0.3.1"
  191. http-lwt-client
  192. http-mirage-client
  193. http-multipart-formdata >= "2.0.0" & < "3.0.0"
  194. http2https
  195. httpaf-lwt-unix
  196. httpun-lwt
  197. httpun-mirage
  198. httpun-ws-lwt
  199. hvsock >= "1.0.2"
  200. i3ipc >= "0.1.4"
  201. imaplet-lwt
  202. influxdb-lwt
  203. inotify >= "2.4"
  204. inquire < "0.3.0"
  205. interface-prime-lwt
  206. iocaml < "0.4.6"
  207. iocaml-kernel >= "0.4.3" & < "0.4.6"
  208. iocamljs-kernel
  209. ip2location
  210. ip2locationio
  211. ip2whois
  212. ipv6-multicast-lwt
  213. irc-client-lwt
  214. irc-client-lwt-ssl
  215. irc-client-tls
  216. irmin < "0.9.6" | = "0.9.10" | >= "0.11.0"
  217. irmin-bench
  218. irmin-chunk
  219. irmin-cli
  220. irmin-client
  221. irmin-containers
  222. irmin-fs >= "2.3.0"
  223. irmin-git >= "2.3.0"
  224. irmin-graphql >= "2.3.0"
  225. irmin-http >= "2.3.0"
  226. irmin-indexeddb
  227. irmin-layers
  228. irmin-mem >= "2.3.0"
  229. irmin-mirage-git >= "2.3.0"
  230. irmin-mirage-graphql >= "2.3.0"
  231. irmin-pack
  232. irmin-server
  233. irmin-test >= "2.3.0"
  234. irmin-unix >= "2.3.0"
  235. irmin-watcher >= "0.3.0"
  236. jerboa
  237. jitsu
  238. joolog
  239. jose < "0.9.0"
  240. js_of_ocaml < "2.5"
  241. js_of_ocaml-lwt >= "3.5.0"
  242. jsoo_broadcastchannel
  243. jsoo_router
  244. jsoo_storage
  245. jupyter >= "2.3.0"
  246. jupyter-kernel >= "0.4"
  247. kafka >= "0.3" & < "0.5"
  248. kafka_lwt
  249. kappa-library
  250. ke >= "0.5"
  251. ketrew >= "3.2.0"
  252. kinetic-client < "0.0.3" | >= "0.0.9"
  253. kubecaml
  254. lablqml < "0.6"
  255. lambda-runtime
  256. lambda-term >= "1.13"
  257. lambda_streams_lwt
  258. launchd
  259. ldp
  260. learn-ocaml >= "0.13.0"
  261. learn-ocaml-client >= "0.13.0"
  262. ledgerwallet >= "0.4.0"
  263. letsencrypt
  264. letsencrypt-app
  265. letsencrypt-dns
  266. letters
  267. libres3
  268. links != "0.9"
  269. linol-lwt
  270. llama
  271. lru_cache < "v0.16.0"
  272. lwt-binio < "0.2.0"
  273. lwt-canceler
  274. lwt-dllist
  275. lwt-exit
  276. lwt-parallel >= "1.0.0"
  277. lwt-pipe
  278. lwt-pipeline
  279. lwt-watcher
  280. lwt-zmq < "1.0.0"
  281. lwt_camlp4
  282. lwt_domain
  283. lwt_eio
  284. lwt_glib >= "1.0.1"
  285. lwt_log >= "1.1.0"
  286. lwt_ppx
  287. lwt_ppx_let
  288. lwt_react >= "1.0.1"
  289. lwt_ssl >= "1.0.1"
  290. mariadb < "0.5.1"
  291. markup = "0.7.6"
  292. markup-lwt
  293. mdx
  294. mechaml
  295. mehari-lwt-unix
  296. mehari-mirage
  297. memtrace-mirage
  298. metrics-influx
  299. metrics-lwt
  300. metrics-mirage
  301. metrics-unix
  302. mimic
  303. mindstorm-lwt
  304. mirage >= "0.4.1" & != "0.6.1" & < "0.8.0" | >= "0.10.0" & < "2.7.0"
  305. mirage-block < "1.0.0" | >= "2.0.0"
  306. mirage-block-ccm
  307. mirage-block-combinators
  308. mirage-block-lwt
  309. mirage-block-partition
  310. mirage-block-ramdisk
  311. mirage-block-solo5
  312. mirage-block-unix < "2.3.0" | = "2.8.2" | >= "2.13.0"
  313. mirage-block-xen
  314. mirage-bootvar-solo5 >= "0.2.0"
  315. mirage-bootvar-unix
  316. mirage-bootvar-xen >= "0.4.0"
  317. mirage-channel >= "4.0.0"
  318. mirage-channel-lwt
  319. mirage-clock-freestanding < "3.0.0"
  320. mirage-clock-lwt
  321. mirage-clock-unix >= "1.3.0" & < "3.0.0"
  322. mirage-console >= "3.0.0"
  323. mirage-console-lwt
  324. mirage-console-solo5 >= "0.2.0"
  325. mirage-console-unix >= "2.2.1"
  326. mirage-console-xen >= "5.0.0"
  327. mirage-console-xen-backend
  328. mirage-console-xen-cli
  329. mirage-crypto-entropy
  330. mirage-crypto-rng >= "0.7.0" & < "0.11.0"
  331. mirage-crypto-rng-lwt
  332. mirage-crypto-rng-mirage >= "0.8.8"
  333. mirage-device >= "2.0.0"
  334. mirage-dns < "3.0.0"
  335. mirage-entropy
  336. mirage-flow >= "1.0.3" & < "1.2.0" | >= "2.0.0"
  337. mirage-flow-combinators
  338. mirage-flow-lwt < "1.3.0" | >= "1.5.0"
  339. mirage-flow-rawlink
  340. mirage-flow-unix >= "1.3.0"
  341. mirage-fs >= "3.0.0"
  342. mirage-fs-lwt
  343. mirage-fs-unix < "1.1.1" | >= "1.3.0"
  344. mirage-http
  345. mirage-http-unix
  346. mirage-http-xen
  347. mirage-kv >= "3.0.0"
  348. mirage-kv-lwt
  349. mirage-kv-unix
  350. mirage-logs != "0.3.0"
  351. mirage-nat < "3.0.0"
  352. mirage-net >= "3.0.1"
  353. mirage-net-fd
  354. mirage-net-lwt
  355. mirage-net-macosx
  356. mirage-net-solo5
  357. mirage-net-unix >= "2.2.0"
  358. mirage-net-xen
  359. mirage-os-shim >= "3.0.0"
  360. mirage-profile
  361. mirage-protocols >= "4.0.0" & < "8.0.0"
  362. mirage-protocols-lwt
  363. mirage-qubes < "0.2" | >= "0.4"
  364. mirage-qubes-ipv4
  365. mirage-random-stdlib >= "0.1.0"
  366. mirage-runtime >= "3.7.0"
  367. mirage-solo5
  368. mirage-stack >= "2.0.0" & < "4.0.0"
  369. mirage-stack-lwt
  370. mirage-time >= "2.0.0"
  371. mirage-time-lwt
  372. mirage-time-unix
  373. mirage-types-lwt < "3.7.1"
  374. mirage-unix >= "3.0.0"
  375. mirage-vnetif
  376. mirage-vnetif-stack
  377. mirage-www >= "1.1.0"
  378. mirage-xen
  379. mirror
  380. monorobot
  381. moonpool-lwt
  382. mqtt >= "0.0.2"
  383. mrmime >= "0.5.0"
  384. multipart-form-data >= "0.2.0"
  385. multipart_form >= "0.2.0" & < "0.4.0"
  386. multipart_form-cohttp-lwt < "0.6.0"
  387. multipart_form-lwt
  388. mwt
  389. naboris
  390. nanomsg
  391. nbd = "2.1.1" | >= "4.0.3"
  392. nbd-tool
  393. nbd-unix
  394. netchannel
  395. nocrypto >= "0.5.4"
  396. nottui-lwt
  397. nproc
  398. nsq >= "0.4.0"
  399. obrowser
  400. obuilder
  401. obus >= "1.2.1"
  402. ocaml-variants >= "4.00.1+mirage-unix" & < "4.00.1+open-types"
  403. ocluster
  404. ocluster-api
  405. ocluster-worker
  406. ocplib-concur
  407. ocplib-resto
  408. ocsigenserver >= "2.10"
  409. ocsipersist
  410. ocsipersist-dbm
  411. ocsipersist-lib
  412. ocsipersist-pgsql
  413. ocsipersist-sqlite
  414. octez-distributed-lwt-internal
  415. octez-internal-libs
  416. octez-l2-libs
  417. octez-libs
  418. octez-proto-libs
  419. octez-protocol-compiler
  420. octez-proxy-server
  421. octez-rpc-process
  422. octez-shell-libs
  423. octez-smart-rollup-wasm-benchmark-lib
  424. odoc >= "2.0.0" & < "2.1.0"
  425. oframl
  426. ojquery
  427. ojs-base
  428. ojs_base
  429. omigrate
  430. oneffs
  431. opam-sync-github-prs
  432. openflow < "0.2.0"
  433. opentelemetry-client-cohttp-lwt
  434. opentelemetry-cohttp-lwt >= "0.4"
  435. opentelemetry-lwt
  436. opium >= "0.11.0" & != "0.16.0"
  437. opium-graphql
  438. opium_kernel
  439. opomodoro
  440. order-i3-xfce
  441. ordma >= "0.0.3"
  442. oskel >= "0.3.0"
  443. ounit-lwt < "2.2.0"
  444. ounit2-lwt
  445. owork
  446. ox < "1.1.0"
  447. ozulip
  448. paf
  449. paf-cohttp
  450. passage
  451. pcap-format >= "0.3.3" & < "0.5.0"
  452. petrol
  453. pgx_lwt
  454. pgx_lwt_mirage
  455. pgx_lwt_unix < "2.0"
  456. piaf
  457. picos >= "0.3.0"
  458. plebeia >= "2.0.0"
  459. plist-xml-lwt
  460. plotkicadsch >= "0.4.0"
  461. ppx_defer >= "0.4.0"
  462. ppx_deriving_rpc
  463. ppx_json_types
  464. ppx_netblob
  465. ppx_rapper_lwt
  466. ppx_sqlexpr
  467. proc-smaps
  468. prof_spacetime
  469. prometheus
  470. prometheus-app
  471. promise_jsoo_lwt
  472. protocol-9p >= "0.10.0"
  473. protocol-9p-unix
  474. qcow >= "0.8.1"
  475. qcow-format < "0.3"
  476. qcow-tool
  477. qfs = "0.5" | >= "0.7"
  478. quests
  479. rawlink >= "1.0" & < "2.1"
  480. rawlink-lwt
  481. rdf_json_ld
  482. rdf_lwt
  483. redis-lwt
  484. reparse-lwt
  485. reparse-lwt-unix
  486. resource-pooling >= "0.3.2"
  487. resp
  488. resp-mirage >= "0.10.0"
  489. resp-unix >= "0.10.0"
  490. resto
  491. resto-cohttp-client >= "0.4"
  492. resto-cohttp-self-serving-client
  493. resto-cohttp-server >= "0.4" & < "0.6" | >= "0.9"
  494. resto-directory >= "0.4"
  495. riak
  496. ringo-lwt
  497. river
  498. rock
  499. rpc >= "1.5.1" & < "7.1.0"
  500. rpclib-js
  501. rpclib-lwt
  502. SZXX < "4.0.0"
  503. sanddb
  504. scgi
  505. sendmail-lwt
  506. serial
  507. server-reason-react
  508. session-cohttp-lwt
  509. session-cookie-lwt
  510. session-postgresql-lwt >= "0.4.1"
  511. sessions
  512. shared-block-ring < "2.3.0" | >= "3.0.0"
  513. shared-memory-ring >= "1.2.0" & < "2.0.0"
  514. shared-memory-ring-lwt
  515. sherlodoc
  516. sihl < "0.2.0"
  517. slack
  518. slacko
  519. slipshow
  520. socket-daemon < "0.3.0"
  521. speed
  522. spin < "0.8.0"
  523. spoke
  524. spotify-web-api < "0.2.1"
  525. sqlexpr = "0.7.1" | >= "0.9.0"
  526. statsd-client
  527. stk
  528. stog >= "0.16.0"
  529. syguslib-utils
  530. syndic >= "1.4" & < "1.6.0"
  531. tar-format >= "0.4.1"
  532. tar-mirage
  533. tar-unix
  534. tcpip >= "3.1.1" & < "3.4.1" | >= "4.1.0"
  535. teash
  536. telegraml
  537. terminus
  538. tezos-base >= "13.0"
  539. tezos-clic >= "13.0"
  540. tezos-crypto >= "13.0"
  541. tezos-crypto-dal
  542. tezos-error-monad >= "8.0" & < "9.0" | >= "13.0"
  543. tezos-lwt-result-stdlib >= "9.0"
  544. tezos-p2p >= "11.0" & < "13.0"
  545. tezos-protocol-compiler >= "13.0"
  546. tezos-protocol-environment >= "13.0"
  547. tezos-proxy >= "17.1"
  548. tezos-proxy-server
  549. tezos-stdlib
  550. tezos-stdlib-unix >= "8.0" & < "9.0" | >= "13.0"
  551. tezos-test-helpers >= "12.0"
  552. tezos-wasmer
  553. tezos-webassembly-interpreter-extra
  554. tezt
  555. tftp
  556. themoviedb
  557. tidy_email
  558. tls = "0.10.1" | >= "0.10.6" & < "0.16.0"
  559. tls-lwt
  560. tls-mirage
  561. transmission-rpc
  562. tube >= "4.3.0"
  563. tuntap >= "1.0.0" & < "1.7.0" | >= "2.0.0"
  564. twirp_cohttp_lwt_unix
  565. typerex-lldb
  566. u2f
  567. uring
  568. uspf
  569. uspf-lwt
  570. utop >= "1.4.0"
  571. uwt >= "0.3.0"
  572. vchan >= "0.9.7" & < "2.0.0" | >= "2.0.3"
  573. vchan-unix
  574. vchan-xen
  575. vercel
  576. vhd-format >= "0.7.0" & < "0.8.0"
  577. vhd-format-lwt >= "0.12.0"
  578. vhd-tool < "0.12.0"
  579. vmnet >= "1.3.2"
  580. vpnkit >= "0.2.0"
  581. vue-jsoo < "0.3"
  582. wayland < "2.0"
  583. webauthn
  584. websocket < "2.3"
  585. xe-unikernel-upload
  586. xen-api-client < "0.9.14"
  587. xen-block-driver
  588. xen-evtchn < "1.0.6" | >= "2.0.0"
  589. xen-evtchn-unix
  590. xen-gnt >= "2.2.3"
  591. xen-gnt-unix >= "4.0.2"
  592. xenctrl < "0.9.29" | >= "0.9.32"
  593. xenstore >= "1.3.0"
  594. xenstore_transport >= "1.0.0"
  595. xentropyd
  596. yocaml_git
  597. yocaml_unix
  598. yurt < "0.3"
  599. zmq-lwt >= "5.2.1"

Conflicts

None

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