| --- Log opened Wed Apr 17 00:00:08 2013 |
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| 01:12 | <@sshine> | for a bunch of processes that procure a semaphore, is there any guarantee (e.g. in POSIX) that semaphores will be used FIFO or in other ways fairly? |
| 01:14 | <@Azash> | Found an rtems mailing list that says it's FIFO blocking |
| 01:14 | <@Azash> | Meanwhile someone on StackOverflow says there is no guarantee |
| 01:14 | <@sshine> | is that for POSIX semaphores, or semaphores in general? |
| 01:15 | <@Azash> | Hm, the latter is C but does not mention POSIX |
| 01:15 | <@sshine> | Pthreads, eh? |
| 01:15 | <@Azash> | Here's the former http://www.rtems.com/ml/rtems-users/2004/april/msg00086.html |
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| 02:32 | <&ToxicFrog> | sshine: semaphores are part of a POSIX standard independent of pthreads, actually, hence why they don't have the pthread_ prefix |
| 02:34 | <&ToxicFrog> | Anyways, the POSIX standard does not specify how the scheduling works beyond a "may be subject to priority inversion" warning |
| 02:35 | <&ToxicFrog> | If you are targeting a specific implementation (e.g. a specific linux kernel version) you can of course come up with guarantees specific to that. |
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| 04:06 | | * McMartin prepares a 2KB patch. |
| 04:06 | <&McMartin> | This is much more alarming than that 1.3MB patch from last week. |
| 04:07 | | * McMartin decides he will hold off on it and trigger it so that it will be done with the automated aspect of testing when he arrives at work tomorrow. |
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| --- Log closed Wed Apr 17 10:41:57 2013 |
| --- Log opened Wed Apr 17 10:42:05 2013 |
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| 14:56 | <@froztbyte> | http://www.pcworld.com/article/2033318/black-annex-is-the-best-qbasic-game-youve -ever-seen.html |
| 14:58 | < RichyB> | I find the "it requires a 2.6GHz CPU" a bit surprising. |
| 14:59 | < RichyB> | There are some open-source BASIC implementations which go really fast. The language doesn't have (many) semantics that are hard to turn into very terse, quick object code, after all. |
| 15:56 | <@froztbyte> | yeah, I'm left to wonder how much time the author had to spend building some advanced constructs |
| 15:56 | <@froztbyte> | I mean, if all you get are the bricks, you can still get pretty far just with those |
| --- Log closed Wed Apr 17 16:11:13 2013 |
| --- Log opened Wed Apr 17 16:11:20 2013 |
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| 16:41 | < RichyB> | Maybe it's running in actual QBASIC. |
| 16:41 | < RichyB> | Y'know, actual old steam-powered-interpreter QBASIC. |
| 16:42 | <@froztbyte> | mmmmmmmm |
| 16:42 | <@froztbyte> | that'd be tricky |
| 16:42 | <@froztbyte> | I expect the very first issue you'd have is translating the compiler output |
| 16:42 | <@froztbyte> | which, you know, you could actually beat into shape (by further abuse of qbasic) |
| 16:43 | < RichyB> | Huh? All he'd have to do is ship QBASIC.EXE along with his BAS file(s). |
| 16:43 | < RichyB> | (possibly with a copy of DOSbox) |
| 16:43 | <@froztbyte> | yes, that's my point, *old* qbasic probably won't run on modern platforms |
| 16:44 | <&ToxicFrog|W`rkn> | It definitely won't, but I don't know what you're on about wrt "translating the compiler output" |
| 16:44 | <@froztbyte> | and (automatically correctly) surrounding shit with dosbox for the correct visual mode switches and stuff is probably another world of pain |
| 16:44 | <&ToxicFrog|W`rkn> | Old QBASIC is a DOS IDE and interpreter. |
| 16:44 | <@froztbyte> | ToxicFrog|W`rkn: well, I never used qbasic |
| 16:44 | <@froztbyte> | I'd assumed it was a compiled language |
| 16:44 | <&ToxicFrog|W`rkn> | You write your program (in the IDE or a separate editor) and load and run it from inside QBASIC.EXE |
| 16:44 | <@froztbyte> | I'm only familiar with the general state of things around that timeline, have used very few of them personally |
| 16:45 | <&ToxicFrog|W`rkn> | Wrapping it with dosbox is just a matter of putting dosbox itself in the same dir along with a dosbox.conf with an appropriate [autoexec] section; it's not actually very hard at all. |
| 16:45 | <&ToxicFrog|W`rkn> | It does, of course, mean that you need a lot more beef to run it,. |
| 16:46 | <@froztbyte> | last time I tried doing anything with dosbox, I was reminded of 1994 and getting highmem.sys and everything else playing along well |
| 16:46 | <&ToxicFrog|W`rkn> | Yeah, that hasn't really been the case for, at minimum, 3+ years |
| 16:46 | <@froztbyte> | ah |
| 16:46 | <@froztbyte> | sweet |
| 16:46 | <&ToxicFrog|W`rkn> | Longer if you count the first usable frontends (DBGL/D-FEND) |
| 16:47 | <&ToxicFrog|W`rkn> | Seriously, if you're configuring dosbox yourself, just use DBGL. |
| 16:47 | < RichyB> | QBASIC.EXE is an interpreter. |
| 16:47 | < RichyB> | I think you'd just run it as something like "QBASIC.EXE /run DONKEY.BAS" |
| 16:47 | <&ToxicFrog|W`rkn> | If you're releasing something wrapped in DOSBOX, you use DBGL, then package up dosbox + your program + the config file DBGL generated and there you go. |
| 16:47 | < RichyB> | ? put that in dosbox's [autoexec] section and you have yourself a fully-packaged DOS game. |
| 16:47 | < RichyB> | What TF said. |
| 16:48 | <&ToxicFrog|W`rkn> | Or you can just configure it by hand; set the graphic options as you see fit and then just [autoexec] mount game c; c:; qbasic /run donkey.bas |
| 16:48 | <&ToxicFrog|W`rkn> | (this is in fact how GOG does all of their DOS releases, modulo some additional trickery to get CD music and whatnot working) |
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| 18:06 | | * Derakon mutters at transformation matrices. |
| 18:06 | <&Derakon> | I must be misunderstanding something. |
| 18:06 | <&Derakon> | Say I want to apply three rotation transformations to an array. So I have their transformations A, B, and C. |
| 18:07 | <&Derakon> | I start with an identity matrix to represent "no transformation". Then I do C*B*A*I to get the transformation matrix. |
| 18:07 | <&Derakon> | But the problem is that A*I is losing data somehow. |
| 18:08 | <&Derakon> | For example: http://pastebin.com/hZxvvDV7 |
| 18:09 | <&Derakon> | (That's a 90-degree rotation about the Z axis there) |
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| 19:11 | <&Derakon> | Turns out the problem was that numpy was doing per-element multiplication instead of matrix multiplication; I needed to use numpy.dot() instead. Whoops. |
| 19:12 | < RichyB> | AH |
| 19:13 | < RichyB> | (*) means element-wise multiplication if you're using numpy.array()s but matrix-multiplication if you're using numpy.matrix() |
| 19:13 | < RichyB> | Man, that's not even slightly confusing. |
| 19:13 | < RichyB> | Oh wait yes it is. ;P |
| 19:14 | < RichyB> | Sew, use array() everywhere and use .dot() to get matrix multiplication. |
| 19:27 | <&Derakon> | Right. |
| 19:43 | | * RichyB was seriously confused there too. |
| 19:43 | < RichyB> | A by I_A should always be equal to A, no matter what A is. |
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| --- Log closed Thu Apr 18 00:00:22 2013 |