Process Creation

# Parent process create children processes, which, in turn create other processes, forming a tree of processes.

# Resource sharing

# Parent and children share all resources.

# Children share subset of parent’s resources.

# Parent and child share no resources.

# Execution

# Parent and children execute concurrently.

# Parent waits until children terminate.

 

 

$ Address space

@ Child duplicate of parent.

@ Child has a program loaded into it.

$ UNIX examples

@  fork system call creates new process

@ exec system call used after a fork to replace the process’ memory space with a new program.