Today was my last day of work at Viz. It was good… got the testing infrastructure started. Did as much as I could given I only had 8 hours to work on it. Managed to get it done after 5.5 (Wednesday plus some of today) and did some final bug fixing and integrating afterwards. Bid farewell to everyone. <\/p>\n
Today was our P3 interview, which marked the end of our kernel project. His main criticism was that we used 5 locking primitives in our kernel (mutex, cond [condition variable], icond [internal condition variable], ENTER_CRIT\/EXIT_CRIT, and disable_interrupts\/enable_interrupts). He said this was indicative of “running away” from problems by creating more locking primitives than figuring out those problems. Yeah, sounds about right. He also found a potential deadlock in our kernel (that, at least, is very very unlikely) and a few problems with the scheduler. Also, one part of our kernel (a function that either copies to\/from userspace\/kernel space or vice versa depending on where the pointer you pass to it is) was called a 1337 hax and we were told that 1337 hax should be very well documented (whereas ours was lacking any documentation… oops). Also, we generally had bad quality\/missing documentation in our kernel. Not surprising, given how we mostly did the documentation in the last 2 days.<\/p>\n
Today was our pen-based computing presentation, which marks the end of the pen-based class and also of our adventure game mapping tool project. That went pretty well… we managed to implement all desired features and Carl and Edmund got saving\/scrolling working at the last minute. Woo.<\/p>\n
Also, today was our P4 late day. We went into it rather confused on why free was causing page faults left and right and wondering if it was a kernel issue. After about 5 hours of debugging (in addition to the debugging yesterday), as I read through the code because I was completely stumped, I discovered the lines: Overall, it’s been a good semester. I think I’ve decided on a job (the one I kinda decided I wanted since the beginning), and I’ll send out the acceptance letter tomorrow (along side my last rejection letter).<\/p>\n","protected":false},"excerpt":{"rendered":" Today was my last day of work at Viz. It was good… got the testing infrastructure started. Did as much as I could given I only had 8 hours to work on it. Managed to get it done after 5.5 … Continue reading
\nfile_desc* fd_struct;
\n...
\nfd_struct = (file_desc*)malloc(sizeof(fd_struct));
\n...<\/code>
\nOops.
\nSo yeah, the end of OS projects (and our ~7 hour debug issue) and of the semester of workdeath was a stupid typo bug. Whee.<\/p>\n