What are the reasons why parents can terminate their child processes?
A parent may terminate the execution of one of its children for a variety of reasons, such as these:
- The child has exceeded its usage of some of the resources that it has been allocated.
- The task assigned to the child is no longer required.
What happens when a process having no child process?
If any process has no child process then wait() returns immediately “-1”.
What happens when process terminates?
What will happen when a process terminates? Explanation: When a process terminates, it removes from all queues. All allocated resources to that particular process are deallocated and all those resources are returned back to OS. Long-term scheduler selects processes from the job queue and puts them in the ready queue.
How do I make parent process wait?
Syntax in c language: pid_t wait(int *stat_loc); If any process has more than one child processes, then after calling wait(), parent process has to be in wait state if no child terminates. If only one child process is terminated, then return a wait() returns process ID of the terminated child process.
When a child process terminates or stops the kernel will generate a?
When a child process terminates, some information is returned to the parent process. When a child process terminates before the parent has called wait, the kernel retains some information about the process, such as its exit status, to enable its parent to call wait later.
What happens if parent process terminates before init?
If the parent process terminates before the child does, init will indeed take over that responsibility, but it may not be aware of that immediately, so the child may remain a zombie for longer, and thus take up more resources.
Why does parent process wait until all of its child?
It is common for network servers (e.g., FTP and mail) to have one main process that listens for incoming connections, and then to fork a child each time it gets a client connection. Such child processes could terminate at arbitrary times (determined by the clients), and there is no reason for the main process to wait for its children.
When to call wait for child process to end?
Usually, the wait function is called before a child process terminates, in which case the parent process waits for a child process to end; however, if the system already has information about a terminated child process when wait is called, the return from wait occurs immediately. wait also returns if a signal is received and is not ignored.
When is the wait function called in a child process?
Usually, the wait function is called before a child process terminates, in which case the parent process waits for a child process to end; however, if the system already has information about a terminated child process when wait is called, the return from wait occurs immediately.