stjohnd777 / mailbox

This program monitors a inbox directory

• references as inbox
• image files
• image file is processed producing a result, in most cases another image. result is placed into an outbox directory

How Monitor File Events

• inotify mechanism for monitoring file events.
• https://www.linuxjournal.com/article/8478
• https://man7.org/linux/man-pages/man7/inotify.7.html
• The Linux Programming interface, Chapter 19 pg. 419

Designed to implement an image processing chain

• fault tolerant
• scalable
• persistent storage
• SOA

Growth

• memory mapped file
• shared memory
• message oriented middleware

Targeting Linux System

• generic posix
• zcu102, zcu104

Terms

• port
• node
• directories
  • inbox
  • outbox
  • err_box
  • log
  • cmd_box -File
  • pulse

State

• image file exists in inbox directory when process starts polling
  • process the images
• image file is moved into directory from another process
  • process image when copy is complete
• process creates file in inbox directory, writes to the file, then closes the file
  • process file when the file is close on write