Zeek_72_Life-Cycle of a Thread

Life-Cycle of a Thread

A thread goes through various stages in its lifecycle.

For example, A thread is born,It gets started, It runs  and then dies. 

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                                    Start()                                           run()

         NEW            ⇨    RUNNABLE  ⇨   RUNNING  

                         ↘(ERROR)                                                           ↙end      ↘ sleep(),wait()

                                        ⇨    ⇨                         DEAD        ⬅   WAITING

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Following are the stages of the life cycle −

• 
  
• New :
• A new thread begins its life cycle in the new state.
•  It remains in this state until the program starts the thread.
•   It is also referred to as a born thread.
• 
  
• Runnable: 
• After a newly born thread is started, the thread becomes runnable.
• A thread in this state is considered to be executing its task.
• 
  
•  Waiting: 
• Sometimes, a thread transitions to the waiting state while the thread waits for another thread to perform a task.
•  Thread transitions back to the runnable state only when another thread signals the waiting thread to continue executing.
• 
  
•  Timed Waiting:
• A runnable thread can enter the timed waiting state for a specified interval of time.
• A thread in this state transitions back to the runnable state when that time interval expires or when the event it is waiting for occurs.
• 
  
•  Terminated (Dead): 
• A runnable thread enters the terminated state when it completes its task or otherwise terminates.