Author Archives: Ofek Shilon

Reading Specific Monitor Dimensions

Posted on June 19, 2014 by Ofek Shilon

Almost 2 years ago I wrote about the proper way of getting the EDID – and in particular the physical monitor size. I did leave a loose end: I actually had to query the dimensions of a specific monitor (specified … Continue reading →

Posted in Win32 | 8 Comments

Blogging 101

Posted on June 19, 2014 by Ofek Shilon

This is post #101, which makes the previous post #100. When I started all this I didn’t think I’d have 100 things to say.  Glad I was wrong, and hope to still have useful things to say for 100 more … Continue reading →

Posted in Musings | Leave a comment

Vector Deleting Destructor and Weak Linkage

Posted on June 13, 2014 by Ofek Shilon

Now that the discussions on weak linker symbols and vector deleting destructors are in place, it is time to discuss a fact that might seem esoteric but has far reaching implications. After that, it is time to ask for your … Continue reading →

Posted in VC++ | 9 Comments

Executing Code Once Per Thread in an OpenMP Loop

Posted on June 10, 2014 by Ofek Shilon

Take this toy loop: Now suppose you want to run some preparation code once per thread – say, SetThreadName, or SetThreadPriority or whatnot.  How would you go about that? If you code it before the loop the code would execute … Continue reading →

Posted in C++, VC++ | 5 Comments

On Vector Deleting Destructors and some new/delete internals

Posted on June 9, 2014 by Ofek Shilon

A word is due on vector deleting destructors – previously mentioned as the only functions that got weakly bound by the linker. The usual disclaimers apply: everything that follows is my own investigation, in code and online. Nothing here is … Continue reading →

Posted in VC++ | 6 Comments

Setting a Watch on Wide Registers in VS

Posted on June 3, 2014 by Ofek Shilon

General-purpose registers can be watched from the watch window pretty much as regular variables: (the ‘$’ prefix is optional, but is recommended by MS – probably as means to minimize clashes with code variables.) It is less known that you … Continue reading →

Posted in Debugging, VC++ | Leave a comment

x86/x64 Numerical differences – Correction

Posted on February 19, 2014 by Ofek Shilon

In a previous post a truncation scheme was suggested, to circumvent x86/x64 differences in math library implementations: Since then, I accumulated some mileage with the scheme and have come to understand that line 8: -is flawed. Since we drop the … Continue reading →

Posted in Algorithms, C++, VC++ | Leave a comment

Linker Weak Symbols

Posted on February 10, 2014 by Ofek Shilon

C++’s One-Definition-Rule roughly states that In the entire program, an object or non-inline function cannot have more than one definition; if an object or function is used, it must have exactly one definition. Which sounds like a good idea – … Continue reading →

Posted in VC++ | 3 Comments

x86/x64 Library Numerical differences

Posted on February 1, 2014 by Ofek Shilon

There are many online sets of examples of 64 bit migration pitfalls, but I recently came across two that that appear not to be mentioned elsewhere. First, downright compiler bugs.  We still have those and some raise their head only … Continue reading →

Posted in VC++ | 3 Comments

Solving rxinput.dll Crashes

Posted on October 17, 2013 by Ofek Shilon

Recently I started getting hit by access violations with weird stacks: It seems an exception is thrown early in the life of some thread, during the initialization routine of rxinput.dll – a dll I never heard of. Naïve googling taught … Continue reading →

Posted in DirectX, Win32 | 3 Comments