operating system one of the most important type of operating system is real time operating system Real time operating system: Definition: Real time operating system is that type of operating system that complete its task within the deadline or specific time period if not perform it will cause severe consequences . For example: medical imaging system robotics scientific tools some appliances of home phones and cellular switching There are some types of real time operating system: Soft real time operating system Hard real time operating system Firm real time operating system Hard real time operating system: Hard real time operating system is that type of operating system in which system has to sticky perform a given task within the time interval but if task does not perform it will really cause serious consequences . For example : Medical imaging test MRI CT scan Bomb Blast Soft real time operating system Definition :: soft real time operating system is that type of real time operating in which there is no severe consequences if task does not perform within the time limit . for example :; cellular phones and switching Robotics

1. Real Time Operating System :
Definition :
“Real time operating system is that operating
system in which each task perform their function
with in “Prescribed Deadline” and “Failure” to
these deadlines cause serious consequences “
 Example :
• Medical imaging system
• Robotics system
• Scientific experiments
• Weapon system
• Home appliances control system
• Phones and cellular switching

2. Types of real time
operating system
Hard real time
operating
system
Soft real time
operating
system

3. Types of Real time operating system (on
the basis of deadline) :
• Hard real time operating system
• Soft real time operating system
 Hard real time operating system :
“This type of operating system can never miss
its deadline. Missing the deadline may have
disastrous consequences is known as hard real
time operating system “
Definition :

4.  Example:
• Flight control systems
• Weapons defense system
• Medical system
• Railway signaling system
Soft real time operating system :
Definition :
“This type of operating system can miss
its deadline occasionally with some
acceptably low probability. Missing
deadline have no disastrous
consequences known as soft real time
operating system.”

5. Example :
• Telephone switches
• Personal computer
• Electronic games
• Weather monitoring systems
Advantages
of (RTOS) :
• Maximum consumption
• Shorter task shifting time
• Best memory allocation
• Quite error free
Disadvantages
of (RTOS):
•Less multitasking
•Complex scheduling algorithm
•Severe consequence on
missing deadline
•Low priority task delay