Tag Archives: unlock

LIVE Webinar on Learn to Unlock the Maze of Data Variables and Data Summarizing

This Meetup was suggested by someone in Meetup for R and Matlab users

http://www.meetup.com/R-Matlab-Users/

This Meetup will be announced to the group if 3 people say they're going. Or you can announce it now. 

Alice Bradly suggested a new Meetup.

What: [Free Webinar] Learn to Unlock the Maze of Data Variables and Data Summarizing

When: Monday, June 10, 2013 8:00 PM

Where: 
Online
  http://www.edupristine.com/webinars/learn-to-unlock-the-maze-of-data-variables-and-data-summarizing/
CO, NY 

Register Now: http://www.edupristine.com/webinars/learn-to-unlock-the-maze-of-data-variables-and-data-summarizing/
Date: Mon, Jun 10, 2013 8:00 PM EDT (See time in your zone: http://timeanddate.com/s/2dgz)

This session will talk about:
Types of ..

HOW DO YOU START A PROFITABLE TRADING BUSINESS? Read more NOW >>>

NOTE I now post my TRADING ALERTS into my personal FACEBOOK ACCOUNT and TWITTER. Don't worry as I don't post stupid cat videos or what I eat!

Any good ideas on how to unlock the order book when there are gaps from real time order feed?

Any good ideas on how to unlock the order book when there are gaps from real time order feed?

There are gaps from the feed, if missing one order execute message, this order may stay on the order book forever. Do you have any good idea to fix this problem?

——

Most feeds have a gap refresh mechanism. You should be able to determine the gap based on the missing sequence number and do a request for refresh.

—–

Somehow, we can not use retransmission line now, and there are also request limits for retransmission. so besides avoiding gaps, we also need to unlock/uncross the order book when gaps occur in rare condition.

—-

If you don’t have access to retransmission channels how to you deal with a network outage or system or application restart? At this stage your book is completely trashed. Furthermore, retransmission limits for the exchanges that I deal with are in the 100K range. If you are anywhere close to the limits you have bigger problems.

 

HOW DO YOU START A PROFITABLE TRADING BUSINESS? Read more NOW >>>

NOTE I now post my TRADING ALERTS into my personal FACEBOOK ACCOUNT and TWITTER. Don't worry as I don't post stupid cat videos or what I eat!

Simplest C++ Multithreading with Thread classes, mutex, set, wait, lock, unlock defined

Simplest C++ Multithreading with Thread classes, mutex, set, wait, lock, unlock defined

I have searched high and low for the best and simplest multi threading explained within C++. As you know, I have already posted some articles on Linux processes and how deadlocks work. Theoretically, we are trying to prevent the Dead Diamond of Death syndrome. Both Java and C++ have potential solutions but Java has all these features built in natively. C++ needs a new set of classes defined which includes a specialized Thread class.
Using a set of mutex method, we can lock certain processes from subsequent messing up the state of a current thread. An example of mutex locking a storage block of code, look at:
int g_iStorage = 0;
CMutexClass MyMutex;

void StoreValue( int *pInt )
{
MyMutex.Lock(); //the gate keeper. only one thread
//allowed in at a time

g_iStorage = *pInt; //protected data, critical code section

MyMutex.Unlock(); //unblocks, allowing another thread to
//access g_iStorage

}

There are some other methods which work the same way Java’s Threading class and methods. These methods are explained below:
void Set() Sets an event state to signaled, notifying the blocked thread.
BOOL Wait() Places the calling thread in a blocked state until the event state is set to signaled. Returns TRUE on success, FALSE on failure.
void Reset() Resets a signaled event to unsignaled.
event object being used by a receiving thread::
CEventClass event;
.
.
//thread code

.
.
while(bContinueRunning)
{

event.Wait(); // wait for an event to occur

// perform some task

.
.
event.Reset(); // reset the event to un-signaled

}
.
.
Example of an event object used by one thread signaling another:
EventClass event;
.
.
// change some data

.
.
event.Set(); // notify thread that an event has occured,

// set event to signaled

There is more detailed info you could go into. I do believe if you know enough of above, you should be able to show some rudimentary knowledge in multithreading within C++. I would recommend following through with the link below as it is fairly close representation of how Java works.
To download and better understand how all this Thread classes work, go to http://www.codeproject.com/KB/threads/threadobject.aspx
It also contains a very good end to end set of source files to generate your own Thread classes which include the mutexes explained.

HOW DO YOU START A PROFITABLE TRADING BUSINESS? Read more NOW >>>

NOTE I now post my TRADING ALERTS into my personal FACEBOOK ACCOUNT and TWITTER. Don't worry as I don't post stupid cat videos or what I eat!