Published on: 2025-06-13 23:14:31
The Radio Astronomy Software Defined Receiver (RASDR) is a system that provides a versatile Software-Defined Receiver (SDR) that is optimized for Radio Astronomy. RASDR2 is the current hardware that is in testing with a planned general release at this conference. See multiple other presentations at this conference as well as previous SARA Journals and Proceedings publications for the history of this SARA project.
Keywords: astronomy conference defined radio software
Find related items on AmazonPublished on: 2025-06-14 08:45:07
Building interactive web pages with Guile Hoot Dave Thompson — November 30, 2023 A question we frequently hear in discussions about WebAssembly (Wasm) is: "Can Wasm call the DOM (Document Object Model) API?" The answer is: Yes, thanks to Wasm Garbage Collection! In this post, we will use Guile Hoot (our Scheme to Wasm compiler) to demonstrate how a language that compiles to Wasm GC can be used to implement the kind of interactivity we're used to implementing with JavaScript. We'll start ver
Keywords: define document new null ref
Find related items on AmazonPublished on: 2025-07-04 15:39:15
Try unlimited access Only undefined for 4 weeks Then undefined per month. Complete digital access to quality FT journalism on any device. Cancel anytime during your trial.
Keywords: access anytime cancel device undefined
Find related items on AmazonPublished on: 2025-08-21 04:13:51
Thank you, Bing Copilot (ChatGPT), for giving me another “thing I just learned” to blog about. In the early days of “K&R C”, things were quite a bit different. C was not nearly as portable as it is today. While the ANSI-C standard helped quite a bit, once it became a standard, there were still issues when moving C code from machines of different architectures — for example: int x; What is x? According to the C standard, and “int” is “at least 16 bits.” On my Radio Shack Color Computer, and in
Keywords: bit bits code define int
Find related items on AmazonPublished on: 2025-08-23 18:26:46
Fun with -fsanitize=undefined and Picolibc Both GCC and Clang support the -fsanitize=undefined flag which instruments the generated code to detect places where the program wanders into parts of the C language specification which are either undefined or implementation defined. Many of these are also common programming errors. It would be great if there were sanitizers for other easily detected bugs, but for now, at least the undefined sanitizer does catch several useful problems. Supporting the
Keywords: __x sanitizer sizeof undefined unsigned
Find related items on AmazonPublished on: 2025-09-12 08:16:32
LAMBDA: A defined subformula. element: An input that defines the value you are passing through the formula. calculation: The formula you want the function to execute and return. This is required and must be the last argument.
Keywords: argument calculation defined defines formula
Find related items on AmazonPublished on: 2025-09-17 13:26:13
C and C++ Prioritize Performance over Correctness PDF Posted on Friday, August 18, 2023. The original ANSI C standard, C89, introduced the concept of “undefined behavior,” which was used both to describe the effect of outright bugs like accessing memory in a freed object and also to capture the fact that existing implementations differed about handling certain aspects of the language, including use of uninitialized values, signed integer overflow, and null pointer handling. The C89 spec define
Keywords: behavior complement performance program undefined
Find related items on AmazonPublished on: 2025-09-18 04:26:13
C and C++ Prioritize Performance over Correctness PDF Posted on Friday, August 18, 2023. The original ANSI C standard, C89, introduced the concept of “undefined behavior,” which was used both to describe the effect of outright bugs like accessing memory in a freed object and also to capture the fact that existing implementations differed about handling certain aspects of the language, including use of uninitialized values, signed integer overflow, and null pointer handling. The C89 spec define
Keywords: behavior complement performance program undefined
Find related items on AmazonPublished on: 2025-09-29 22:57:59
When I first joined the Chapel team, one pattern used in its C++-based compiler made a strong impression on me. Since then, I’ve used the pattern many more times, and have been very satisfied with how it turned out. However, it feels like the pattern is relatively unknown, so I thought I’d show it off, and some of its applications in the Chapel compiler . I’ve slightly tweaked a lot of the snippets I directly show in this article for the sake of simpler presentation; I’ve included links to the o
Keywords: ast code define node uast
Find related items on AmazonPublished on: 2025-10-10 23:16:33
A Guide to Undefined Behavior in C and C++, Part 1 Also see Part 2 and Part 3. Programming languages typically make a distinction between normal program actions and erroneous actions. For Turing-complete languages we cannot reliably decide offline whether a program has the potential to execute an error; we have to just run it and see. In a safe programming language, errors are trapped as they happen. Java, for example, is largely safe via its exception system. In an unsafe programming languag
Keywords: behavior case code compiler undefined
Find related items on AmazonPublished on: 2025-11-07 23:37:26
TLDR; Starting from Linux kernel version 6.9 on x86_64, there’s a new config option CONFIG_X86_FRED enabled and it adds 16 bytes to the starting point of a task’s kernel stack area, so you’ll need to account for this extra padding in your “raw” kernel stack & pt_regs lookup code. Introduction I’ve been using Ubuntu 24.04 as my main eBPF development and testing platform without issues since its release. It is shipped with Linux kernel version 6.8.0, but Canonical recently released an optional n
Keywords: define ebpf fred kernel struct
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