Re: ActiveMQ CPP library - limit on number of connections/threads

[duncant]

I did some more digging on this in the decaf code.

The error message is coming from this code in ThreadLocalImpl.cpp:

ThreadLocalImpl::ThreadLocalImpl() : tlsKey(0) {
    tlsKey = Threading::createThreadLocalSlot(this);

    if (tlsKey < 0) {
        throw RuntimeException(
            __FILE__, __LINE__, "Thread Local storage limit reached.");
    }
}

So looking at createThreadLocalSlot, in Threading.cpp I see:

    ...stuff...
    for (index = 0; index < DECAF_MAX_TLS_SLOTS; index++) {
        if (library->tlsSlots[index] == NULL) {
            library->tlsSlots[index] = threadLocal;
            break;
        }
    }
    ...stuff...
    return index < DECAF_MAX_TLS_SLOTS ? index : -1;

So, looks like DECAF_MAX_TLS_SLOTS is what's causing my problem.  This is
defined in ThreadingTypes.h:

    #define DECAF_MAX_TLS_SLOTS 384


Hmmm... 384 is 128 times 3.  So maybe each mq consumer creates 3 threads,
therefore I'm running out at 128?  

I wonder what will happen if I just increase DECAF_MAX_TLS_SLOTS and
rebuild.  Right now I'm just blundering around.  I don't suppose there are
still any decaf developers around?





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