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16:24:12
beach
However, between phase 3 and phase 4, I don't see any differences at all, at least not at the moment. The entire SICL machinery is needed in both phases.
16:33:17
beach
I already mentioned "A key concept in all operating system is the process. [...] Associated with each process is its address space, a list of memory locations from 0 to some maximu, which the process can read and write. The address space contains the executable program, the program's data, and its stack."
16:34:51
beach
"Some things that C does not have include ...., and garbage collection. The last one is a show stopper for operating systems."
16:38:22
scymtym
had they stopped at "A key concept in all operating system is the process.", one could argue that a process is the technical realization of a computation and that multiple simultaneous ones should be supported by an operating system. but mentioning the address space and its particularities make that implausible
16:39:02
beach
Oh, I see how they can weasel out of the Genera thing. They could just declare that Genera is not an operating system. I mean, after all, it has garbage collection, so it can't be an operating system.
16:39:03
scymtym
the second one could be read as C not having gc is a show stopper for writing an os in C :)
16:41:58
beach
"When an interrupt occurs, the operating system may have only a few microseconds to perform some action, or lose critical information. Having the garbage collector kick in at an arbitrary moment is intolerable."
16:43:53
scymtym
and the gc would disable or defer interrupt handlers? why? and how would it "kick in" by itself?
16:46:14
beach
How many reputable OS books are out there? This one and that by Silberschatz et al I know. Any others? I am not counting books for specific systems here.
16:47:33
scymtym
my systems programming course was C, BSD sockets and a bit of Linux kernel dissection
16:59:25
beach
"Each process image consists of a process control block, a user stack, the private address space of the process, and any other address space that the process shares with other processes."
21:37:03
heisig
The idea is to have one package for normal users (petalisp-api) and another package for those hacking on Petalisp internals (petalisp-core). I am quite happy with the change.
0:36:49
no-defun-allowed
there's house in haskell if you're really bored, but it's coop multitasking and you can break it if you're too good at orthello iirc
0:43:40
jcowan
IBM once had something called the FORTRAN OS, but it was apparently an OS (of the MS-DOS program loader type) for Fortran programs, probably written in assembler.