Module 13 · From ScratchContainer Runtime

Container 01: Fork and Exec

Processes Threads and the Kernel · Open board

A process, a thread, and the kernel they both ask for help. This stage is the first half of that board: one process starting another.

Before you start. Build Your Own Container Runtime set out the build: a container is an ordinary process with walls around it. This stage builds the process and no walls. A process is a running program, and the kernel gives each one a number, its process id or pid (Processes, Threads & the Kernel draws it). The terminal command echo $? prints the number the last program ended with; zero means it went well. You need nothing else.

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Lab

The program needs twelve pages at once. What happens when it gets eleven frames?

Drag Frames of real memory from 24 down to 11, then back to 12, and watch Time spent working.

Open The working set →

Three long jobs are running when you press a key. How long until the keypress gets the CPU?

Click Take turns, drag How long one turn lasts from 100 ms down to 1 ms, and watch The keypress waits.

Open The time slice →