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Re: Chunked Transfer read callback pause

From: Dan Fandrich <>
Date: Sat, 30 Jun 2012 21:59:14 +0200

On Sat, Jun 30, 2012 at 06:47:38PM +0500, Usman Raza wrote:
> Hello all, im using curl for chunked transfer in a separate thread, by reading
> from a buffer, could anyone tell me how could i pause it, so i could maybe
> switch to another thread (which will write to the buffer) and then switch back
> to resume transfer? i did came across the curl_easy_pause(CURL *handle , int
> bitmask ) function which could be used with returning CURL_READFUNC_PAUSE from
> a callback, but im not sure how i can use it to accomplish thread
> synchronization.Appreciate any help on this.Thanks.

libcurl is inherently paused while in a callback, so if you're just using
the easy interface and therefore have just a single transfer
outstanding, you can ignore curl_easy_pause and just do your thread
synchronization within the read callback. Simply don't return from that
callback with valid data until it's available! You can do any sort
of synchronization you want in that callback, just don't return before
the data is ready.

>>> Dan
List admin:
Received on 2012-06-30