| ActiveMac | Anonymous | Create a User | Reviews | News | Forums | Advertise |
|
|
|
User Controls |
|
New User |
|
Login |
|
Edit/View My Profile |
|
|
|
|
|
|
|
ActiveMac |
|
Articles |
|
Forums |
|
Links |
|
News |
|
News Search |
|
Reviews |
|
|
|
|
|
|
|
News Centers |
|
Windows/Microsoft |
|
DVD |
|
ActiveHardware |
|
Xbox |
|
MaINTosh |
|
News Search |
|
|
|
|
|
|
|
ANet Chats |
|
The Lobby |
|
Special Events Room |
|
Developer's Lounge |
|
XBox Chat |
|
|
|
|
|
|
|
FAQ's |
|
Windows 98/98 SE |
|
Windows 2000 |
|
Windows Me |
|
Windows "Whistler" XP |
|
Windows CE |
|
Internet Explorer 6 |
|
Internet Explorer 5 |
|
Xbox |
|
DirectX |
|
DVD's |
|
|
|
|
|
|
|
TopTechTips |
|
Registry Tips |
|
Windows 95/98 |
|
Windows 2000 |
|
Internet Explorer 4 |
|
Internet Explorer 5 |
|
Windows NT Tips |
|
Program Tips |
|
Easter Eggs |
|
Hardware |
|
DVD |
|
|
|
|
|
|
|
Latest Reviews |
|
Applications |
|
Microsoft Windows XP Professional |
|
Norton SystemWorks 2002 |
|
|
|
Hardware |
|
Intel Personal Audio Player 3000 |
|
Microsoft Wireless IntelliMouse Explorer |
|
|
|
|
|
|
|
Site News/Info |
|
About This Site |
|
Affiliates |
|
ANet Forums |
|
Contact Us |
|
Default Home Page |
|
Link To Us |
|
Links |
|
Member Pages |
|
Site Search |
|
Awards |
|
|
|
|
|
|
|
Credits |
 |
Why are process and thread IDs multiples of four? | |
|
||
| Time: 07:17 EST/12:17 GMT | News Source: Microsoft | Posted By: Kenneth van Surksum | ||
|
Raymond Chen:
On Windows NT-based operating systems,
process and thread IDs happen always to be a multiple of four.
Is this just a coincidence?
Yes, it's just a coincidence, and you shouldn't rely on it
since it is not part of the programming contract.
For example,
Windows 95 process and thread IDs were not always
multiples of four.
(By comparison,
the reason that
kernel handles are always a multiple of four
is part of the specification and will be guaranteed
for the foreseeable future.)
Process and thread IDs are multiples of four as a side-effect of
code re-use.
The same code the allocates kernel handles is also used to allocate
process and thread IDs.
Since kernel handles are a multiple of four,
so too are process and thread IDs.
This is an implementation detail,
so don't write code that relies on it.
I'm just telling you to satify your curiosity. | ||
|
Write Comment
Return to News |
Displaying 301 through 325 of 559 Prev | First | Last | Next |
The time now is
4:53:36 AM
ET.
Any comment problems? E-mail us |
|
Write Comment
Return to News |
Displaying 301 through 325 of 559 Prev | First | Last | Next |
The time now is
4:53:36 AM
ET.
Any comment problems? E-mail us |
