GCDAsyncSocket "didReadDataWithTag" Never called with NSOperation subclass - iphone

Question

In a "getMyFile" method of some XIB file.
I am creating a object of class "A"(subclass of NSOperation) and adding it to a "myFileQueue"(object of NSOperationQueue).
myFileQueue.MaxConcurrentOperationCount = 1;
Problem : didReadDataWithTag" delegate NEVER called in any case.
#import "GCDAsyncSocket.h"
//and all other required classes are imported correctly
//Class : A
#interface A : NSOperation
{
{
GCDAsyncSocket* socket;
dispatch_queue_t dQueue;
BOOL isWorkDone;
}
}
#implementation A {
-main(){
#autoreleasepool {
isWorkDone = NO;
dQueue = dispatch_queue_create(#"MyDQueue", NULL);
socket = [[GCDAsyncSocket alloc] initWithDelegate:self delegateQueue:dQueue];
//NOTE: Even after setting delegateQueue: dispatch_get_main_queue()
//didReadDataWithTag delegate never called
NSError *err = nil;
if (![socket connectToHost:#"192.168.1.142" onPort:12345 error:&err]) // Asynchronous!
{
// If there was an error, it's likely something like "already connected" or "no delegate set"
NSLog(#"I goofed: %#", err);
}
do{
[NSThread sleep:0.2];
}while(!isWorkDone)
}
}
- (void)socket:(GCDAsyncSocket *)sender didConnectToHost:(NSString *)host port:(UInt16)port
{
NSString* myString= #"testing";
NSData* data=[myString dataUsingEncoding: [NSString defaultCStringEncoding] ];
[socket writeData:data withTimeout:-1 tag:1];
}
- (void)socket:(GCDAsyncSocket *)sock didWriteDataWithTag:(long)tag
{
[socket readDataToData:[GCDAsyncSocket ZeroData] withTimeout:-1 tag:TAG_RESPONSE_HEADER];
}
- (void)socket:(GCDAsyncSocket *)sender didReadData:(NSData *)data withTag:(long)tag
{
NSLog(#"didReadDataWithTag called...."); //this method never called in any case
isWorkDone = YES;
}
}