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crash in CFReadStreamOpen when called from secondary thread

Hello!

I am trying to do an HTTP GET from a secondary thread, & when I call  CFReadStreamOpen, I get a crash in the debugger.("Program Received Signal: EXC_ARITHMETIC")
The crash occurs in _CFNetConnectionRegisterClass. If I call CFReadStreamOpen from the main thread, it works fine. What am I missing ? Do I need to do any initialization in the secondary thread ?

Thanks,
Shalini

PS:

Here is how I create the thread :
    MPCriticalRegionID criticalRegion;
    OSStatus retStatus = MPCreateCriticalRegion(&criticalRegion);
       
    retStatus = MPEnterCriticalRegion(criticalRegion, 5000*2);
    MPTaskID taskID;
    retStatus = MPCreateTask(&ThreadFunc, strArray, 0, 0, NULL, NULL, 0, &taskID);
    retStatus = MPExitCriticalRegion(criticalRegion);  
    retStatus = MPDeleteCriticalRegion(criticalRegion);

My HTTP GET calls look like this:

        CFStringRef url = "" href="http://10.169.150.209:8080/MetadataUploadServlet?Screenname=foo&Title=Testing&ThumbnailExtension=jpg">http://10.169.150.209:8080/MetadataUploadServlet?Screenname=foo&Title=Testing&ThumbnailExtension=jpg");

        CFURLRef myURL = CFURLCreateWithString(kCFAllocatorDefault, url, NULL);

        CFStringRef requestMethod = CFSTR("GET");

        CFHTTPMessageRef myRequest = CFHTTPMessageCreateRequest(kCFAllocatorDefault, requestMethod, myURL,
                               kCFHTTPVersion1_1);
       

            CFDataRef mySerializedRequest = CFHTTPMessageCopySerializedMessage(myRequest);
            CFReadStreamRef stream = CFReadStreamCreateForHTTPRequest(kCFAllocatorDefault, myRequest);
       
            CFStreamClientContext    ctxt      = { 0, (void*)NULL, NULL, NULL, NULL };

            CFReadStreamSetProperty(stream, kCFStreamPropertyHTTPAttemptPersistentConnection, kCFBooleanTrue);
            CFReadStreamSetClient(stream, kNetworkEvents, ReadStreamClientCallBack, &ctxt);
            CFReadStreamScheduleWithRunLoop(stream, CFRunLoopGetCurrent(), kCFRunLoopCommonModes);
            CFReadStreamOpen(stream);

      
        CFRelease(myRequest);
        CFRelease(myURL);
        CFRelease(url);
        myRequest = NULL; 


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