Question

Is the following piece of code

  if(ESRCH == pthread_kill(Thread_Id,0))
            start_Thread_Again

a good way to check if my thread has accidentally exited? Can we use it similar to

   wait(-1,W_NOHANG)

Answer 1

“Accidentally exited?” A thread does not exit accidentally, it exits because your code tells it to do so [meaning you have a bug if you didn’t want it to exit].

From the manpage for pthread_kill: “As in kill(), if sig is zero, error checking shall be performed but no signal shall actually be sent.”

Your code is wrong, it must check for equality.