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Archive for the 'General' Category

(Chronologically Listed)

More x64 assembler fun-facts–new assembler directives

The Windows x64 ABI (Application Binary Interface) presents some new challenges for assembly programming that don’t exist for x86. A couple of the changes that must be taken into account can can be seen as very positive. First of all, there is now one and only one OS specified calling convention. We certainly could have [...]

Posted by Allen Bauer on October 10th, 2011 under 64bit, CodeGear, Delphi, General, Work | Comment now »

x64 assembler fun-facts

While implementing the x64 built-in assembler for Delphi 64bit, I got to “know” the AMD64/EM64T architecture a lot more. The good thing about the x64 architecture is that it really builds on the existing instruction format and design. However, unlike the move from 16bit to 32bit where most existing instruction encodings were automatically promoted to [...]

Posted by Allen Bauer on October 5th, 2011 under 64bit, Delphi, General | 6 Comments »

“Talk Amongst Yourselves” #3

So far we’ve had “Testing synchronization primitives” and “Writing a ‘self-monitoring’ thread-pool.” Let’s build on those topics, and discuss what to do with exceptions that occur within a scheduled work item within a thread pool.
My view is that exceptions should be caught and held for later inspection, or re-raised at some synchronization point. What do [...]

Posted by Allen Bauer on April 7th, 2010 under Delphi, General, Parallel Programming, Work | 5 Comments »

Another installment of “Talk Amongst Yourselves”

Let’s start thinking about thread pools. How do you manage a general purpose thread pool in the face of no-so-well-written-code? For instance, a task dispatched into the thread pool never returns, effectively locking that thread from ever being recycled. How do you monitor this? How long do you wait before spooling out a new thread? [...]

Posted by Allen Bauer on March 26th, 2010 under CodeGear, Delphi, General, Parallel Programming, Work | 7 Comments »

Simple question… very hard answer… Talk amongst yourselves…

I’m going to try a completely different approach to this post. I’ll post a question and simply let the discussion ensue. I would even encourage the discussion to spill over to the public newsgroups/forums. Question for today is:
How can you effectively unit-test synchronization primitives for correctness or more generally, how would you test a concurrency [...]

Posted by Allen Bauer on March 22nd, 2010 under CodeGear, Delphi, General, Parallel Programming | 25 Comments »

A Happy Accident and a Silly Accident

By now you’re all aware that we’re getting ready to move to a new building here in Scotts Valley. This process is giving us a chance to clean out our offices and during all these archeological expeditions, some lost artifacts are being (re)discovered. Note the following:

These are some bookends that my father made [...]

Posted by Allen Bauer on February 23rd, 2010 under CodeGear, General, Random, Work | 3 Comments »

What. The. Heck.

Is. This? I simply cannot explain this. At. All.

This was on a bulletin/white-board in the break area. I’d never noticed it because it was covered with photos from various sign-off (final authorization to release the product) celebrations. Lots of photos of both past and present co-workers, many thinner and with more hair ;-). Since [...]

Posted by Allen Bauer on February 19th, 2010 under CodeGear, Delphi, General, Random, Work | 10 Comments »

A case when FreeAndNil is your enemy

It seems that my previous post about FreeAndNil sparked a little controversy. Some of you jumped right on board and flat agreed with my assertion. Others took a very defensive approach. Still others, kept an “arms-length” view. Actually, the whole discussion in the comments was very enjoyable to read. There were [...]

Posted by Allen Bauer on February 16th, 2010 under CodeGear, Delphi, General, Work, ednfront | 38 Comments »

Oh, the things you find…

When you’re cleaning out your office.

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Posted by Allen Bauer on February 12th, 2010 under Delphi, General, Work | 3 Comments »

A case against FreeAndNil

I really like the whole idea behind Stackoverflow. I regularly read and contribute where I can. However, I’ve seen a somewhat disturbing trend among a lot of the answers for Delphi related questions. Many questions ask (to the effect) “why does this destructor crash when I call it?” Invariably, someone would post an answer with [...]

Posted by Allen Bauer on February 5th, 2010 under Delphi, General, Work | 31 Comments »

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