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Parallel Processing with Threads
Threads allow for multiple flows of execution within a process
simultaneously.
The child process has a unique process ID different parent process ID.
Parent and childs share file pointers and a shared memory segment.
POSIX Threads are common for Linux.
You can use threads with C, Java, Perl, Python, etc .
Zombies
Processes marked "defunct" are dead processes (so-called
"zombies") that remain because their parent has not destroyed
them properly. These processes will be destroyed by init(8) if
the parent process exits.