When I tried to run a slightly adapted version of multithread.c out of the
examples with https url's it failed miserably on our VMS test system.

I got 6, unable to resolve host ( how do you build curl with ares
support??)
or 27 , unable to create SSL context or just core ( stack on VMS ) dumps,
usually
in Curl_SSLconnect.

If I put a sleep(4) in the loop that creates the threads, it works ok.

(See attached file: mt.c)
Btw. the OpenSSL docu is rather blunt. It says at least the 2 static
locking routines should
be provided when running OpenSSL in a multithreaded environment.

All in all, Jose Chung might be right that something needs to be done.
regards,
Jose

|---------+---------------------------------------->
| | Daniel Stenberg |
| | <daniel-curl_at_haxx.se> |
| | Sent by: |
| | curl-library-admin_at_lists.sour|
| | ceforge.net |
| | |
| | |
| | 12/16/2003 11:24 AM |
| | Please respond to |
| | curl-library |
| | |
|---------+---------------------------------------->
>--------------------------------------------------------------------------------------------------------|
  | |
  | To: libcurl Mailing list <curl-library_at_lists.sourceforge.net> |
  | cc: |
  | Subject: Re: thread safe use of openssl |
>--------------------------------------------------------------------------------------------------------|

On Tue, 16 Dec 2003, jose chung wrote:

> Based on my perusal of the CURL code, it doesn't seem like it uses
OpenSSL
> in a thread safe manner as it does not implement either the static
locking
> or dynamic locking callbacks.

I've been under the impression that our use of OpenSSL does not warrant
those
locking methods. I take your mail here as a saying that we do.

I find that odd, since I believe we have lots of users who have used
libcurl
multi-threaded for HTTPS transfers...

> Since I couldn't find it, and since I had problems using HTTPS in CURL
with
> multithreaded apps, I've implemented static and dynamic locking for VMS,
> AIX, and Win32 into CURL.

I don't want locking methods inside libcurl, since locking is a
multi-platform
nightmare. The share interface was added for sharing data between multiple
threads, and I figure we could indeed use that interface for locking/share
SSL
resources as well should this be determined to be necessary.

> I'm not certain if CURL has intentionally left this as an exercise for
the
> user, but if it hasn't, I'd be happy to contribute what I have.

I would inded be interested, but we should perhaps first clear out what the
problems you've been experiencing resulted in and that this locking is
really
necessary.

--
    Daniel Stenberg -- http://curl.haxx.se/ -- http://daniel.haxx.se/
   [[ Do not send mails to this email address. They won't reach me. ]]
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