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libcurl
neovasant
neovasant

Reputation: 3

libcurl multi asynchronous support

From the examples and documentation, it seems libcurl multi interface provides asynchronous support in batch mode i.e. easy handles are added to multi and then finally the requests are fired simultaneously with curl_multi_socket_action. Is it possible to trigger a request, when easy handle is added but the control returns to application after request is written on the socket?

EDIT: It'll help in firing request in the below model, instead of firing requests in batch(assuming request creation on client side and processing on the server takes same duration)
Client -----|-----|-----|-----|
Server < >|-----|-----|-----|----|

Upvotes: 0

Views: 762

Answers (2)

yayaya
yayaya

Reputation: 165

you can check the documents this: https://curl.haxx.se/libcurl/c/hiperfifo.html

It's combined with libevent and libcurl. When running, the program creates the named pipe "hiper.fifo"

Whenever there is input into the fifo, the program reads the input as a list of URL's and creates some new easy handles to fetch each URL via the curl_multi "hiper" API.

The fifo buffer is handled almost instantly, so you can even add more URL's while the previous requests are still being downloaded.

Then libcurl will download all easy handles asynchronously by calling curl_multi_socket_action ,so the control will return to system.

Upvotes: 0

Daniel Stenberg
Daniel Stenberg

Reputation: 58114

The multi interface returns "control" to the application as soon as it would otherwise block. It will therefor also return control after it has sent off the request.

But I guess you're asking how you can figure out exactly when the request has been sent? I think that's only really possibly by using CURLOPT_DEBUGFUNCTION and seeing when the request is sent. Not really a convenient way...

Upvotes: 1

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