On Mon, Jul 08, 2013 at 12:41:35PM -0400, Keyur Govande wrote:
> On Mon, Jul 8, 2013 at 2:44 AM, Yehezkel Horowitz
> <horowity_at_checkpoint.com> wrote:
> >
> > > The goal of this email was to know if there's a way to distinguish these 2 cases, so a.php can make the appropriate decision.
> >
> > Are you looking for something like curl_multi_info_read ?
> >
> > You can combine it with curl_multi_wait in order to easily handle all the async operations.
> >
>
> Sorry, not sure I understand.
>
> Neither of those scenarios is an error, so curl_multi_info_read()
> returns NULL when called right after curl_multi_exec() as show below:
>
> $mc_handle = curl_multi_init();
> $c = curl_init();
> // Set up the handle and options
> curl_multi_add_handle($mc_handle, $c);
> do {
> $cme = curl_multi_exec($mc_handle, $remain);
> } while ($cme == CURLM_CALL_MULTI_PERFORM);
> $rc = curl_multi_info_read($mc_handle); // This returns FALSE i.e.
> NULL from the C library both when the connection was successful and
> when it is still waiting.
>
>
> > > We're currently using the 7.19.7 version of libcurl.
> >
> > This is quite old, and you’ll not be able to use curl_multi_wait (added in 7.28.0), but I see you are using curl_multi_select which probably do the job for you.
> >
> >
>
> Neither curl_multi_wait() nor the 'older' function curl_multi_fdset()
> exposes whether the internal file descriptor is ready for writes
> (indicating a successful connection).
>

Seems to me that what you're doing isn't asynchronous at all. You're
using a single thread and the only behavior that *might* be categorized
as asynchronous is your attempt at this guessing game to allow some
local work to be done before attempting to read the response from the
server. I feel you've created a solution in search of a problem.

Daniel's earlier comment about your need to not know the internal state
of the transfer is spot on. If you want to do this asynchronously, then
really do it asynchronously. Spin off a separate thread to do the
transfer and join it when you're ready for the response.

Cheers,
Dave

> >
> > HTH
> >
> >
> >
> > Yehezkel Horowitz
> >
> >
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Received on 2013-07-08