inGPIO.waitForEdge() leads to hang in program execution

[0xsubh]

Hi, I am trying to poll the GPIO pins and slightly modified the chp06/gpio/tests/test_syspoll.cpp as follows:

#include<iostream>
#include<unistd.h>
#include"GPIO.h"
using namespace exploringBB;
using namespace std;

int main(){
   GPIO outGPIO(44), inGPIO(45);
   inGPIO.setDirection(INPUT);    //button is an input
   outGPIO.setDirection(OUTPUT);  //LED is an output
   for(int i=0;i<100;i++)
   {
      outGPIO.setValue(HIGH);
      usleep(10);
      outGPIO.setValue(LOW);
      cout<< endl <<"toggle done";

      // poll the echo pin to go high
      inGPIO.setEdgeType(FALLING);   //wait for rising edge
      inGPIO.waitForEdge();          //will wait forever
      cout<< endl <<"checkpoint";
      usleep(1000*100);
   }
   return 0;
}

I am unable to debug this problem