Re: RES: Parallel Process with readers - pcsc-lite

At 03:45 PM 7/3/2013, Ludovic Rousseau wrote:
>2013/7/3 MURILO COSTA <[email protected]>:
>> I thought that maybe can be a Java problem, do you know some software to do this kind of test (parallelism) ? I'll check if pcsc-tools can do that...
>
>I guess it is a javax.smartcardio "limitation".
>
>You need to create one context per reader using SCardEstablishContext.
>I bet the Java wrapper creates only one context for all the readers.
>In pcsc-lite the context is associated to a mutex. So all your
>commands will block on the same mutex even if they use different
>readers.
>I don't know if is it easy or even possible to avoid this Java wrapper
>"feature".


Probably not - here's the source code from the default provider implementation for JDK7.  It even comments that it uses the same context id for each of these:




final class PCSCTerminals extends CardTerminals {

    // SCARDCONTEXT, currently shared between all threads/terminals
    private static long contextId;

    // terminal state used by waitForCard()
    private Map<String,ReaderState> stateMap;

    PCSCTerminals() {
        // empty
    }

    static synchronized void initContext() throws PCSCException {
        if (contextId == 0) {
            contextId = SCardEstablishContext(SCARD_SCOPE_USER);
        }
    }


One way around this is to grab the source code and build yourself a different provider using the code as a base.

Mike




>> Do you think that issue have some relationship with this Ludovic post:
>> http://ludovicrousseau.blogspot.com.br/2013/06/ccid-descriptor-statistics_7148.html
>
>No.
>
>Bye
>
>--
> Dr. Ludovic Rousseau
>
>_______________________________________________
>Muscle mailing list
>[email protected]
>http://lists.musclecard.com/mailman/listinfo/muscle_lists.musclecard.com