Summary When considering the use of pthread_mutex_t vs std::atomic_flag for achieving locks in a multi-threaded environment, especially in real-time systems, understanding the performance implications is crucial. The question revolves around the speed of acquiring a lock with pthread_mutex_t when the lock can be achieved immediately, and how it compares to using std::atomic_flag. Root Cause The … Read more
Summary Upgrading a C++17 codebase to C++20 using MSVC 2022 triggered a series of obscure compiler errors (C3878, C2760, C2065, C7510) in template-heavy code. The root cause was the two-phase name lookup changes introduced in C++20, specifically the requirement to use the typename keyword for dependent type names. The template code relied on pre-C++20 behaviors … Read more
Summary The question revolves around the optimization technique used in Excel’s Solver tool, specifically whether it’s more effective to double the max iterations or execute the Solver twice with a lower max iteration limit, starting from the result of the previous calculation. The author observed that executing Solver twice with reduced iterations led to consistent … Read more
Streamlit Service Interruption Postmortem: Persistent Execution Failure on Windows Terminals Summary A Streamlit application deployed on a Windows Server was designed for 24/7 availability but terminated unexpectedly upon terminal closure. The failure stemmed from misapplied daemonization approaches. Resolution involved implementing native Windows service management through NSSM to decouple app execution from terminal sessions. Root Cause … Read more
Summary When working with WiFi connections on devices like the ESP32, using the Arduino-IDE, a common question arises regarding the most efficient way to print data to the client. The options in question are: using multiple client.print() statements with a mix of strings and floats, or concatenating all the data into a single string before … Read more
Why two modes for tininess in IEEE754 Floating-point standard? Summary IEEE 754 defines two tininess detection modes (before rounding and after rounding) for determining underflow during floating-point operations. While the functional difference occurs in an extremely narrow numerical range (~2⁻¹⁵⁰ for single-precision), these modes offer flexibility to hardware designers in balancing precision requirements against implementation … Read more
Summary This article addresses a common issue in Power Automate where users need to group an array by one column and concatenate text in another column. The problem arises when working with arrays of objects and the requirement is to aggregate data based on a specific key. Root Cause The root cause of this issue … Read more
Summary The “column must appear in the GROUP BY clause” error occurs when using Laravel Livewire PowerGrid to display aggregated data by month from a PostgreSQL database. This error is caused by the fact that the id column is not included in the GROUP BY clause, but is used in the ORDER BY clause. The … Read more
Summary The Micropython code example for Bluetooth Low Energy (BLE) communication between a central and peripheral device using ble_simple_central.py and ble_simple_peripheral.py is not working as expected. The peripheral device is able to print received data correctly, but the central device is only printing <memoryview> instead of the actual data. Root Cause The root cause of … Read more
# Postmort hospitaleem: Stale UI Data in WPF MVVM Due to Unhandled Database Changes ## Summary A WPF MVVM application failed to reflect external database changes in UI controls (`DataGrid`, `TextBox`, etc.) because it lacked a mechanism to detect/apply live updates. This led users to act on **stale data**. ## Root Cause The core failure … Read more