The program paint
A demonstration: drawing with the pointer.
left button: draw right button: erase click a color at the top c: clear
This program is also a service: it serves its exports while it runs. Another program draws on the paper with isolated calls. The calls execute in the one thread of this program, between two input events.
| Fact | Value |
|---|---|
| Source | programs/paint |
| Boot image | in the boot image; the image is not built, so its size is not known |
| Imports | none |
| Imported by | none |
Exports
| Export | What it does |
|---|---|
| line(from_x: Integer, from_y: Integer, to_x: Integer, to_y: Integer, color: Integer) -> Integer | draws a line on the paper, with a color of the palette (0 to 5) |
| write(x: Integer, y: Integer, text: Text, color: Integer) -> Integer | draws a text on the paper, with a color of the palette (0 to 5) |
| clear() | erases the paper |
| lines() -> Integer | gives the count of lines that calls drew since the last clear |
| entry() |
Read from the source of the module, as the build reads it to describe the exports (tools/kerneltool/describe.odin).
What the root service gives it
| What | Value | As the root service says |
|---|---|---|
| Grants | {.Serve} | sample: the module of the tables, started as a program when a caller connects. |
| Budget: pages, programs, threads | {pages = 2048, programs = 1, threads = 1} | Not named in things_of: the budget of each other program. |
Read from grants_of and things_of in programs/root/main.odin; budget_of in the same file adds the limits of processor time and of log records.