Calling a custom function on Buy

[yogesh.karale]

I am trying to run a custom function when We get buy signal. But could not figure out how to do it.

The crude logic is something like this.

Buy = (condition for buy)
Sell = (condition for Sell)

Buy=ExRem(Buy,Sell); ( avoid multiple signals showing)
Sell=ExRem(Sell,Buy);

if(Buy)
{
myfunction_1();
}

if(Sell)
{
myfunction_2();
}

I want these functions called only once when the buy or sell signal arrives.

I am totally stuck.

Thanks