Life of a Process

Program vs Process

• Programs -> The applications that we can un.
• Processes -> Programs that are running.

Process Creation and Termination

Windows

boot -> smss.exe -> winlogon.exe -> csrss.exe

Linux

in Linux, processes have a parent child relationship.
all processes come from a process.
the initial process is init

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Managing Process

Reading Process Information

Windows

• taskmgr.exe
• TaskList

linux

• ps -x
• ps -ef
• /proc -> stores files corresponds to running processes

Signals

a way to tell a process that something's just happened

Windows & Linux

• SIGINT -> signal interrupt CTRL + C

Managing Processes

Windows

• Process Explorer -> a utility Microsoft created to let users look at running processes.

Linux

• kill -> sends SIGTERM
• kill -KILL -> sends SIGKILL
• kill -TSTP -> sends SIGTSTP (terminal stop)
• kill -CONT -> sends SIGCONT (continue)
• SIGTERM -> give process time to clean up before die
• SIGKILL -> kill process without giving it time to clean up.
• SIGTSTP -> put a process in a suspended state
• SIGCONT -> resume suspeneded process

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Process Utilization

Resource Monitoring

Windows

• Resource Monitoring tool

Linux

• top -> shows the top processes that are using the most resources on machine.
• uptime ->
• lsof => lists open files and what processes are using them.