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SocketWaitNext[{socket1,socket2,…}]

waits until there is data ready to read on any of the socketi, then returns that socket.

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SocketWaitNext

SocketWaitNext[{socket1,socket2,…}]

waits until there is data ready to read on any of the socketi, then returns that socket.

Details

Examples

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Basic Examples  (2)

Connect to a site 5 times and measure how long it takes for the first connection to be ready:

Wolfram Language code: socks = Table[SocketConnect["http://exampledata.wolfram.com"], 5];

Write a request out on all the sockets and measure how long it takes for at least one of them to get back a request:

Wolfram Language code: WriteString[#, "GET /50states.txt HTTP/1.1 "]& /@ socks; First@AbsoluteTiming[SocketWaitNext[socks]]

Close the sockets:

Wolfram Language code: Close /@ socks;

Open a server socket and connect some clients to it:

Wolfram Language code: server = SocketOpen[Automatic]; clients = Table[SocketConnect[server], 4];

Initially, none of the clients are ready:

Wolfram Language code: SocketReadyQ /@ clients

Write data to a random client from the server in the local session after a delay of 3 seconds:

Wolfram Language code: SessionSubmit[ScheduledTask[WriteString[RandomChoice[server["ConnectedClients"]], DateString[]], {3}]]

Read the data sent to the client once it has been submitted:

Wolfram Language code: ByteArrayToString[SocketReadMessage[First[SocketWaitNext[clients]]]]

Close the sockets:

Wolfram Language code: Close[server]; Close /@ clients;

Possible Issues  (1)

SocketWaitNext does not support web sockets:

Wolfram Language code: socket = SocketConnect["wss://echo.websocket.org"]; SocketWaitNext[{socket}]
Wolfram Research (2017), SocketWaitNext, Wolfram Language function, https://reference.wolfram.com/language/ref/SocketWaitNext.html.

Text

Wolfram Research (2017), SocketWaitNext, Wolfram Language function, https://reference.wolfram.com/language/ref/SocketWaitNext.html.

CMS

Wolfram Language. 2017. "SocketWaitNext." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/SocketWaitNext.html.

APA

Wolfram Language. (2017). SocketWaitNext. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/SocketWaitNext.html

BibTeX

@misc{reference.wolfram_2026_socketwaitnext, author="Wolfram Research", title="{SocketWaitNext}", year="2017", howpublished="\url{https://reference.wolfram.com/language/ref/SocketWaitNext.html}", note=[Accessed: 13-June-2026]}

BibLaTeX

@online{reference.wolfram_2026_socketwaitnext, organization={Wolfram Research}, title={SocketWaitNext}, year={2017}, url={https://reference.wolfram.com/language/ref/SocketWaitNext.html}, note=[Accessed: 13-June-2026]}