Hacker News: mandarax8

New comment by mandarax8 in "Reverting the incremental GC in Python 3.14 and 3.15"

mandarax8 — Thu, 14 May 2026 13:08:42 +0000

Please read up some more about Java and GCs. Memory allocation and GC are heavily intertwined.

New comment by mandarax8 in "Optimizing a lock-free ring buffer"

mandarax8 — Thu, 26 Mar 2026 16:39:53 +0000

See https://fgiesen.wordpress.com/2012/07/21/the-magic-ring-buff... which takes it even further :)

New comment by mandarax8 in "A tale about fixing eBPF spinlock issues in the Linux kernel"

mandarax8 — Wed, 25 Mar 2026 11:31:09 +0000

Indeed I misread. I figured the NMI must have been nested or otherwise they wouldn't have gone through all this trouble just to drop samples :)

New comment by mandarax8 in "A tale about fixing eBPF spinlock issues in the Linux kernel"

mandarax8 — Mon, 23 Mar 2026 08:37:21 +0000

Not OP: how would you handle the second interrupt during the interrupt handler here then? I can see how you could use two separate ring buffers for different contexts, but I don't see how to handle the nested interrupt. Also indeed they just drop all these samples that get deadlocked.

Actually, as long as you use different ring buffers for interrupt/non-interrupt context, it should be fine to just drop if you encounter a deadlock due to interrupting an already running interrupt handler.

New comment by mandarax8 in "A tale about fixing eBPF spinlock issues in the Linux kernel"

mandarax8 — Fri, 20 Mar 2026 11:31:24 +0000

One thing wasn't clear for me in the article: is there only one such ringbuffer defined by the kernel or can the eBPF program specify as many ringbuffers as it wants?

New comment by mandarax8 in "An interactive intro to quadtrees"

mandarax8 — Fri, 27 Feb 2026 18:02:20 +0000

I give up, tell me the AABB trick please

New comment by mandarax8 in "C++ says “We have try... finally at home”"

mandarax8 — Sun, 28 Dec 2025 13:23:35 +0000

The entire point of the article is that you cannot throw from a destructor. Now how do you signal that closing/writing the file in the destructor failed?

New comment by mandarax8 in "4 billion if statements (2023)"

mandarax8 — Fri, 12 Dec 2025 20:57:57 +0000

Maybe we can even find some correlation in the bit pattern of the input and the Boolean table!

New comment by mandarax8 in "Shaders: How to draw high fidelity graphics with just x and y coordinates"

mandarax8 — Sun, 23 Nov 2025 15:35:09 +0000

The pixel position has to be known, how else are you rasterizing something?

New comment by mandarax8 in "Apple M5 chip"

mandarax8 — Wed, 15 Oct 2025 17:33:39 +0000

Their current OpenGL 4.1 actually does run on top of metal making it even more blatantly obvious that they just don't want to.

New comment by mandarax8 in "OpenGL: Mesh shaders in the current year"

mandarax8 — Fri, 10 Oct 2025 19:30:46 +0000

I'm not sure exactly what you mean, but you can both output line primitives directly from the mesh shader or output mitered/capped extruded lines via triangles.

As far as other platforms, there's VK_EXT_line_rasterization which is a port of opengl line drawing functionality to vulkan.

New comment by mandarax8 in "Under the hood: Vec"

mandarax8 — Thu, 09 Oct 2025 15:05:31 +0000

That said MSVC,GCC and clang all implement it to allocate an exact value.

New comment by mandarax8 in "Shipping WebGPU on Windows in Firefox 141"

mandarax8 — Wed, 16 Jul 2025 14:26:19 +0000

Can you point me to some good middleware then? I haven't been able to find any.

New comment by mandarax8 in "Parameterized types in C using the new tag compatibility rule"

mandarax8 — Fri, 27 Jun 2025 17:14:20 +0000

Any kind of relative/offset pointers require negative pointer arithmetic. https://www.gingerbill.org/article/2020/05/17/relative-point...

New comment by mandarax8 in "Bzip2 crate switches from C to 100% Rust"

mandarax8 — Wed, 18 Jun 2025 07:56:10 +0000

You can still statically link all your own code but dynamically link libc/other system dependencies.

New comment by mandarax8 in "Simplest C++ Callback, from SumatraPDF"

mandarax8 — Sun, 15 Jun 2025 21:35:34 +0000

Yeah it's a shame that to go from your idea to something that's 'general' (ie just some arbitrary arguments) you need to write this arcane garbage.

New comment by mandarax8 in "Simplest C++ Callback, from SumatraPDF"

mandarax8 — Sun, 15 Jun 2025 20:32:10 +0000

std::bind is bad for him for the same reasons std::function is bad though

New comment by mandarax8 in "Simplest C++ Callback, from SumatraPDF"

mandarax8 — Sun, 15 Jun 2025 20:24:37 +0000

What he shows here is 75% of c++26's std::function_ref. It's mainly missing variadic arguments and doesn't support all types of function objects.

https://github.com/TartanLlama/function_ref/blob/master/incl...

New comment by mandarax8 in "Fun with Futex"

mandarax8 — Tue, 03 Jun 2025 20:05:56 +0000

But you can embed this 1 byte lock into other bigger objects (eg. high bytes of a pointer).

With 4 byte locks your run into the exact same false sharing issues.

New comment by mandarax8 in "Show HN: Hexi – Modern header-only network binary serialisation for C++"

mandarax8 — Fri, 28 Mar 2025 19:32:59 +0000

Because the only way to do metaprogramming in C++ is via the type system. Thismakes it so you need to implement 'functions' as types.