TweetFollow Us on Twitter

Mar 95 Viewpoint
Volume Number:11
Issue Number:3
Column Tag:The Editor’s Viewpoint

The Editor’s Viewpoint

By Scott T Boyd, Editor

I recently came across the following e-mail closing:

“(Anxiously awaiting a protected memory MacOS)”

We all know what he was getting at, don’t we? If only we had memory protection, life would be oh-so-much better. As often as we hear this, read this, and utter this, it must be true.

Memory protection - it’s got to be good. Make sure that stray writes won’t damage anything else, and the machine will stand solid as a rock, impervious to the vagaries of programmer error and lack of foresight. Let’s go march in front of Apple’s R&D center with placards, bullhorns, and riot police, and demand our memory protection now!

pan•a•ce•a n. a supposed remedy, cure, or medicine for all diseases or ills; cure-all [Webster’s New World Dictionary, 2nd College Edition]

Memory protection sounds so good, but it’s a panacea, a holy grail. Now, that’s not to say that it’s necessarily a bad thing; far from it. Nevertheless, it’s not the solution. If it were, unix systems wouldn’t crash, and wouldn’t get corrupted, but they do.

What is the solution? I’ll get to that, but for now consider this - fixation on a panacea can distract us to the point of missing real solutions.

The writer of the e-mail I mentioned above listed a serious of difficulties he experienced recently while trying to install and use a complex environment. He also offered his workarounds. Let’s take a look at the problems.

Crashes. Workaround - reinstall MacOS from scratch (clean install). Reason - system corruption from repeated crashes.

Corrupted files and file system. Workaround - run Norton Utilities, Disk First Aid, and so forth. A bad file system often gets worse, so fix problems early and avoid more damage.

Faulty system extensions. Workaround - remove suspect extensions. These can cause trouble whether they’re intact or corrupted.

Unknown crashes. Workaround - power down the machine for a few minutes. Reason - don’t know, but it seems to work sometimes when simple rebooting doesn’t.

Incorrect parameter RAM settings. Workaround - zap PRAM. Reason - bad settings can result in improperly configured hardware and software.

While this list isn’t complete, let’s see what we can quickly figure out about what’s happening here.

Problem: corrupted system file. Possible causes include:

• power or system failure during a write to the system file, due to “natural causes” or “human nature” (see below).

• power or system failure before the file system cache is flushed to disk, or while a file is open

• faulty hardware (SCSI termination, SCSI drive, cables, etc.)

• bad software changing the system file unintentionally or incorrectly.

Problem: file system corruption. Possible causes include all of the above, as well as improper use of file system calls (e.g. it would be bad to write directly to any of a number of system-owned files).

Problem: incompatibilities introduced by extensions. Possible causes are too numerous to mention. It’s hard to write system software, and that’s what extensions are - system software. Extendibility makes the Macintosh interesting, and it comes with a price.

Problem: Only a shutdown, power off, then restart solves problem. Typically caused by equipment problems (overheating, for example). Might also be that something needs to be reset but doesn’t except during a cold start.

Problem: configuration settings improperly set. Probable cause? Someone or something writing to PRAM unintentionally or incorrectly.

Back to the suggestion that protected memory will fix lots of problems - will it?

Will it protect the file system from corruption in the event of power failure? system failure? Wouldn’t that really require a robust file system? Perhaps a transaction-based system, complete with commit/rollback (like most databases do)?

Power failure comes in many forms. “Human nature” runs deep, and I’ve seen power failure result from inadvertent use of what looks very much like a floppy eject button on the front of certain models of Macintosh (e.g. my PowerMac 6100). My 18-month-old daughter, who seriously enjoys inserting floppies into floppy slots, one day put one into my 6100.

When I explained that it can only hold one, and you have to take it out before you can put another in, she decided that she’d better get that first one out of there. Without hesitation, she reached right up to push the floppy eject button. The next 60 ticks flowed by as slowly as a glacier’s movement as I (calmly?) said, “NO!” and rushed to avert disaster.

If only I’d had protected memory, right? A system design along the lines of a PowerBook (such as a soft power switch and battery backup) might prove more efficacious. (Of course, moving the switch elsewhere might work, too!)

Will memory protection defend against poorly-written system software? Having written some Apple system software myself, I can assure you that it’s entirely possible that Apple might accidentally ship some system software that has a bug in it. Not that I ever shipped any bugs (not on purpose, at any rate), but I did ship a few bug fixes, some for buggy Apple code, some for buggy 3rd-party code. Any errors in the system software may bring it to its knees, no matter what kind of protection is in place. Ever see a unix kernel crash? I have. Ever see the Power Macintosh memory-protected nanokernel crash? I have (three times yesterday, and twice today, unfortunately). Computers are complicated beasts, and it’s extremely tough to cover all the possibilities, memory protection notwithstanding.

Will memory protection protect against someone writing to the system file directly? Nope. How about protecting against someone adding or changing resources in the system file? Again, nope. Is it possible to protect the system file? Sure. One example is the Macintosh Classic, which can boot from ROM (just try to change that system file!). By the same token, anything that is protected by a software mechanism, yet offers an API for writing, opens up the possibility that someone may use it incorrectly. This same reasoning covers what happens with PRAM. It’s generally pretty difficult to write to PRAM without using the API. Yet we still see situations where the PRAM (or the CUDA, which handles serial on the AVs) gets incorrectly configured. Bugs in Apple’s code? Bugs in 3rd party code? Sure. Will protection help? Not really.

What’s the solution? Modernization, certainly. Memory protection is a good thing (holy grails are nice to have), but it’s going to be a while yet. And keep in mind what it’s supposed to protect against - flawed software that goes astray. And who writes it? We all do! It’s time that we learn what mistakes we’re making, and then teach each other about them, and then devise methods to avoid them.

Finally, Apple could help out with overhauled and/or new APIs which help us avoid common pitfalls. Such APIs could help by making errors harder to make (reducing the error modes), and by offering services so we can stop writing some of the same old code for the umpteenth time. And how about offering only the calls we need, and not a few thousand calls of everything you could ever think of?

On a Slightly Different Topic

So you want to start a company and you’re sweating it out at your “real” job while developing your killer idea? Maybe you’ve taken the big step and gone out on your own to bring the killer idea to market. Maybe, just maybe, it looks almost like a product. Now what do you do? Why, marketing, of course! And how better to start than by building a “presence”? Not every upstart could pull it off, but the odd assortment of Collaboration Technologies, Mark/Space Softworks, MacUp, Mac the Knife, and even Apple filled Bondage A Go Go with wide-eyed MacWorld show-goers to mingle and gawk at people in black/leather/fetish attire. As with many marketing efforts, it’s hard to know whether Mac Black ’95 achieved the desired effect, but no doubt remains about whether the attendees will remember it!

Food For Thought

Have Net, will travel! - Brad Kollmyer

 

Community Search:
MacTech Search:

Software Updates via MacUpdate

Latest Forum Discussions

See All

Combo Quest (Games)
Combo Quest 1.0 Device: iOS Universal Category: Games Price: $.99, Version: 1.0 (iTunes) Description: Combo Quest is an epic, time tap role-playing adventure. In this unique masterpiece, you are a knight on a heroic quest to retrieve... | Read more »
Hero Emblems (Games)
Hero Emblems 1.0 Device: iOS Universal Category: Games Price: $2.99, Version: 1.0 (iTunes) Description: ** 25% OFF for a limited time to celebrate the release ** ** Note for iPhone 6 user: If it doesn't run fullscreen on your device... | Read more »
Puzzle Blitz (Games)
Puzzle Blitz 1.0 Device: iOS Universal Category: Games Price: $1.99, Version: 1.0 (iTunes) Description: Puzzle Blitz is a frantic puzzle solving race against the clock! Solve as many puzzles as you can, before time runs out! You have... | Read more »
Sky Patrol (Games)
Sky Patrol 1.0.1 Device: iOS Universal Category: Games Price: $1.99, Version: 1.0.1 (iTunes) Description: 'Strategic Twist On The Classic Shooter Genre' - Indie Game Mag... | Read more »
The Princess Bride - The Official Game...
The Princess Bride - The Official Game 1.1 Device: iOS Universal Category: Games Price: $3.99, Version: 1.1 (iTunes) Description: An epic game based on the beloved classic movie? Inconceivable! Play the world of The Princess Bride... | Read more »
Frozen Synapse (Games)
Frozen Synapse 1.0 Device: iOS iPhone Category: Games Price: $2.99, Version: 1.0 (iTunes) Description: Frozen Synapse is a multi-award-winning tactical game. (Full cross-play with desktop and tablet versions) 9/10 Edge 9/10 Eurogamer... | Read more »
Space Marshals (Games)
Space Marshals 1.0.1 Device: iOS Universal Category: Games Price: $4.99, Version: 1.0.1 (iTunes) Description: ### IMPORTANT ### Please note that iPhone 4 is not supported. Space Marshals is a Sci-fi Wild West adventure taking place... | Read more »
Battle Slimes (Games)
Battle Slimes 1.0 Device: iOS Universal Category: Games Price: $1.99, Version: 1.0 (iTunes) Description: BATTLE SLIMES is a fun local multiplayer game. Control speedy & bouncy slime blobs as you compete with friends and family.... | Read more »
Spectrum - 3D Avenue (Games)
Spectrum - 3D Avenue 1.0 Device: iOS Universal Category: Games Price: $2.99, Version: 1.0 (iTunes) Description: "Spectrum is a pretty cool take on twitchy/reaction-based gameplay with enough complexity and style to stand out from the... | Read more »
Drop Wizard (Games)
Drop Wizard 1.0 Device: iOS Universal Category: Games Price: $1.99, Version: 1.0 (iTunes) Description: Bring back the joy of arcade games! Drop Wizard is an action arcade game where you play as Teo, a wizard on a quest to save his... | Read more »

Price Scanner via MacPrices.net

14-inch M4 Pro/M4 Max MacBook Pros on sale th...
Don’t pay full price! Get a new 14″ MacBook Pro with an M4 Pro or M4 Max CPU for up to $320 off Apple’s MSRP this weekend at these retailers…they are the lowest prices available for these MacBook... Read more
Get a 15-inch M4 MacBook Air for $150 off App...
A couple of Apple retailers are offering $150 discounts on new 15″ M4 MacBook Airs this weekend. Prices at these retailers start at $1049: (1): Amazon has new 15″ M4 MacBook Airs on sale for $150 off... Read more
Unreal Mobile is offering a $100 discount on...
Unreal Mobile, an MVNO using AT&T and T-Mobile’s networks, is offering a $100 discount on any new iPhone with service. This includes new iPhone 16 models as well as iPhone 15, 13, and SE phones... Read more
16-inch M4 Pro MacBook Pros on sale for $250-...
Don’t pay full price! Amazon has 16-inch M4 Pro MacBook Pros (Silver or Black colors) on sale right now for up to $300 off Apple’s MSRP. Shipping is free. These are the lowest prices currently... Read more
Get a 14-inch M4 MacBook Pro for up to $240 o...
Amazon is offering a $150-$250 discount on Apple’s 14-inch M4 MacBook Pros right now. Shipping is free. Be sure to select Amazon as the seller, rather than a third-party seller: – 14″ M4 MacBook Pro... Read more
Clearance 14-inch M3 Pro MacBook Pros availab...
B&H Photo has clearance 14″ M3 Pro MacBook Pros (in Black or Silver) on sale for $500 off original MSRP, only $1499. B&H offers free 1-2 day delivery to most US addresses: – 14″ 11-Core M3... Read more
Sams Club is offering a $50 discount on Titan...
Sams Club has Titanium Apple Watch Series 10 models on sale for $50 off Apple’s MSRP. Sams Club Membership required. Note that sale prices are for online orders only, in-store prices may vary. Choose... Read more
Sunday Sale: Apple’s latest 13-inch M4 MacBoo...
Amazon has new 13″ M4 MacBook Airs on sale for $150 off MSRP right now, starting at $849. Sale prices apply to most colors and configurations. Be sure to select Amazon as the seller, rather than a... Read more
Apple’s M4 Mac minis on sale for record-low p...
B&H Photo has M4 and M4 Pro Mac minis in stock and on sale right now for up to $150 off Apple’s MSRP, each including free 1-2 day shipping to most US addresses. Prices start at only $469: – M4... Read more
Week’s Best Deals: 14-inch M4 MacBook Pros fo...
Don’t pay full price! These retailers are offering $200-$250 discounts on new 14-inch M4 MacBook Pros this week…they are the lowest sale prices available for new MacBook Pros: (1): Amazon is offering... Read more

Jobs Board

All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.