Let's resume the book club.

# Chapter 9

Chapter 9 wasn't very exxeptional, most of it was about learning regex
related stuff.

there's a typo that hits hard in 9.4:

Quote:There is another tool is use extremely useful, which remains to be seen.

The end of chapter 9 is seninha's favorite, diving into AWK examples.

Apart from these, ramfs seems like a pretty nice idea as a command. I
know it's a replicated in Linux and other systems too. But I'm not sure
it's as easy as on Plan9.


# Chapter 10

This chapter was about the basic of concurrent programming, discussions
about race conditions, mutex (lock/unlock) and the specific application
to Plan9.

The naming is interesting: rendezvous to synchronize processes at a
certain position.

Quote:When a process calls rendezvous with a given tag, the process blocks until
another process calls rendezvous with the same tag, then exchange value.

Lastly, the concept of semaphore is actually really well explained,
I never knew it was a train metaphor.