Weird behavior of external interrupts

for project, i'm using 2 internal pull-up resistor buttons on arduino uno.

both work in conjunction interrupt in order trigger specific function outside of loop().

for reason, when exiting 1 of functions, programmingmode() or cleaningmode(), program seems
trigger function again if hold down button long.  if press , release either button quickly,
the program functions normally.

i have 2 theories, although attempts solve either 1 have not solved problem:

  1.  when either button pressed within programmingmode() or cleaningmode(), interrupt called second time.
  2.  the interrupts, although set falling, somehow pickup rising action of button well??

here's code:

code: [select]

int programmingpin = 2;      
int cleaningpin = 3;      

int interruptprogramming = 0;
int interruptcleaning = 1;    

volatile int programmingstatus = 0;    
volatile int cleaningstatus = 0;      

void setup()
{
   attachinterrupt(interruptprogramming, isprogrammingmode, falling);
   attachinterrupt(interruptcleaning, iscleaningmode, falling);  
   
   digitalwrite(programmingpin, high);
   digitalwrite(cleaningpin, high);
}

void loop()
{
   if (programmingstatus == 1)
   {
       programmingmode();
       programmingstatus = 0;
   }
   
   if (cleaningstatus == 1)
   {
       cleaningmode();
       cleaningstatus = 0;
   }
}

void isprogrammingmode()
{
   programmingstatus = 1;
}

void iscleaningmode()
{
   cleaningstatus = 1;
}

void programmingmode()
{        
   for ( ; ; )
   {
       if (digitalread(programmingpin) == low)
       {
           break;
       }
   }
}

void cleaningmode()
{
   for ( ; ; )
   {
       if (digitalread(cleaningpin) == low)
       {
           break;
       }
   }
}


moderator edit: [code] [/code] tags added.

a couple of questions me understand doing

1. mean "i'm using 2 internal pull-up resistor buttons" ?
2. empty loops in functions ?

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