=== ANCHOR POEM ===
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Hi, I'm learning about semaphores right now and trying to explain them to a
friend. But I only sorta understand how they work - can anyone look at this
pseudocode and tell me if I'm on the right track?
![Some C pseudocode working through the semaphore design pattern. Here's the text of the pseudocode: /* no lock example */ void start_thread(int* x) { *x += 1; } int main() { int x = 0; for (1000 times){ start_thread(&x); } print(x); } /* in this case you have no idea what will print because thread A will take x and be like "ah yes it's 423" and then in the next instruction it'll be like "I'll increment this to be 424" and in the next one it'll say "okay now it's time to store 424 in the variable X" but like... there's a thousand threads all doing that at the same time, so odds are you'll have 5 that are like "ah yes this is 423 I'll set it to 424" */ /* not a good plan. Need a lock, so only one thread can use it at once. */ /* mutex example: */ void start_thread(int* x, int* x_mutex) { *x += 1; *x_mutex = 0; } int main() { int x = 0; int x_mutex = 0; for (1000 times){ while (x_mutex != 0){ } /* do nothing */ x_mutex = thread_id; start_thread(&x, &x_mutex); } print(x); } /* this should print 1000, but it's basically as slow as doing it single threaded. */ #define MAX 10 void start_thread(int* x, int* x_semaphore) { *x += 1; *x_semaphore += 1; } int main() { int x[MAX]; int x_semaphore = MAX; for (1000 times) { for (int i = 0; i < MAX; i++) { x_semaphore -= 1; start_thread(&x[i], &x_semaphore); } while (x_semaphore != MAX) { } /* do nothing */ } int value = sum(x, MAX); print(value); }](/similar-different/media/224b236a8660c34a.png "Some C pseudocode working through the semaphore design pattern. Here's the text of the pseudocode: /* no lock example */ void start_thread(int* x) { *x += 1; } int main() { int x = 0; for (1000 times){ start_thread(&x); } print(x); } /* in this case you have no idea what will print because thread A will take x and be like \"ah yes it's 423\" and then in the next instruction it'll be like \"I'll increment this to be 424\" and in the next one it'll say \"okay now it's time to store 424 in the variable X\" but like... there's a thousand threads all doing that at the same time, so odds are you'll have 5 that are like \"ah yes this is 423 I'll set it to 424\" */ /* not a good plan. Need a lock, so only one thread can use it at once. */ /* mutex example: */ void start_thread(int* x, int* x_mutex) { *x += 1; *x_mutex = 0; } int main() { int x = 0; int x_mutex = 0; for (1000 times){ while (x_mutex != 0){ } /* do nothing */ x_mutex = thread_id; start_thread(&x, &x_mutex); } print(x); } /* this should print 1000, but it's basically as slow as doing it single threaded. */ #define MAX 10 void start_thread(int* x, int* x_semaphore) { *x += 1; *x_semaphore += 1; } int main() { int x[MAX]; int x_semaphore = MAX; for (1000 times) { for (int i = 0; i < MAX; i++) { x_semaphore -= 1; start_thread(&x[i], &x_semaphore); } while (x_semaphore != MAX) { } /* do nothing */ } int value = sum(x, MAX); print(value); }")
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=== SIMILARITY RANKED ===
--- #1 fediverse/111 ---
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@user-95 that's why I like programming - it's my favorite form of spelling.
i'm not very good at remembering all the names and the numbers, but I like to
think I can make things do a function.
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--- #2 fediverse/1246 ---
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@user-883
hehe if I don't understand how it works it's difficult for me to use things.
My Linux friends get so exasperated with me because I'm like "cool script
gimme like 2 days to figure it out" and they're like "bro just use these
flags" and I'm like "no"
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--- #3 fediverse/1221 ---
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@user-883
either that or I might get lost in some C code we'll see how things develop
>.>
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--- #4 fediverse/1518 ---
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│ CW: strange-politics-scary │
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acceleration-ism is just "learning the truth faster than they do"
tbh should be more like "learning things to show them" but eh whatever gets
the job done
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--- #5 fediverse/3680 ---
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it's probably a good idea to write pseudocode, then real code, instead of
starting with real code, and bugfixing something incomplete and more difficult
to reason with.
unless you write real code easier than pseudocode. idk do what works for you.
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--- #6 fediverse/581 ---
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@user-428
sometimes I think about how much more productive I'd be if I had a code editor
that let me draw arrows and smiley faces and such alongside the code. Or if I
could position things strangely, like two functions side-by-side with boxes
drawn around them. Or diagrams or flowcharts or graphs or...
something that would output to raw txt format, but would present itself as an
image that could be edited.
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--- #7 fediverse/5719 ---
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I love dispatch tables! which is a term I just learned and a concept I have
been using for a while.
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--- #8 fediverse/2459 ---
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this is the simplest implementation of scalable anarchism I could think of.
tell me how it's flawed so I can improve it before I need it.
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--- #9 fediverse/376 ---
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@user-281
I'm just a rando but my understanding is that posting on the fediverse is
sorta like writing on the sky, and anyone that wants can read it. I could be
wrong though
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--- #10 fediverse/4128 ---
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@user-883
wait until they learn what you've been working on while they were getting
better at... whatever they're more experienced in than you.
the computer pictures you post are legitimately some of the coolest I've
known! I don't exactly go looking for that kind of stuff because it's not my
thing, but I appreciate seeing all the neat stuff you're working on.
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--- #11 fediverse/5663 ---
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I'm going to write some lua code that doesn't do anything useful and which I
don't share with anyone
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--- #12 fediverse/3124 ---
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I should not have to follow 16 steps that I don't understand just because you
decided my system wasn't good enough for me.
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--- #13 fediverse/3817 ---
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hey, anyone wanna build the matrix with me? minus the human CPUs of course.
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--- #14 messages/264 ---
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Don't write self documenting code! Force people to read the documentation so
they know how to use it
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--- #15 fediverse/6292 ---
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I'm stuck. I don't know how to leverage whatever talents I have into making
things happen. Maybe I should seek advice from a wise elder...
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--- #16 fediverse/4804 ---
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I love it when wine doesn't work because it "failed to open program.exe"
... okay, can you tell me why it failed?
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--- #17 fediverse/4084 ---
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│ CW: re: -mentioned │
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@user-1074
the more you try, the more you have to calculate, which is a problem, because
endlessly recursive calculations create infinite loops, which frankly are
impossible to compute because they defy computation! Not good, not ideal, no
thank you, not for me, no thanks, not what I'd like.
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--- #18 fediverse/112 ---
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I live through the moments where I find a folder of stuff I made that I forgot
about and I can go back and see it for the first time.
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--- #19 fediverse/2774 ---
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I want to emphasize that my mask is just as much a part of me as the other
part.
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--- #20 fediverse/466 ---
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I love Linux. All I have to do is type "authserver" and "worldserver" and
wouldn't you know it suddenly a universe is created (with very constrained
rules) that anyone might inhabit should they desire to. It's not like I'm
perfect - oh wait I have a toot about that, gimme a sec
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