|
Last change
on this file was 2, checked in by bird, 22 years ago |
|
Initial revision
|
-
Property cvs2svn:cvs-rev
set to
1.1
-
Property svn:eol-style
set to
native
-
Property svn:executable
set to
*
|
|
File size:
859 bytes
|
| Line | |
|---|
| 1 | This readme refers to the file thr-mach.c.
|
|---|
| 2 |
|
|---|
| 3 | Under mach, thread priorities are kinda strange-- any given thread has
|
|---|
| 4 | a MAXIMUM priority and a BASE priority. The BASE priority is the
|
|---|
| 5 | current priority of the thread and the MAXIMUM is the maximum possible
|
|---|
| 6 | priority the thread can assume. The developer can lower, but never
|
|---|
| 7 | raise the maximum priority.
|
|---|
| 8 |
|
|---|
| 9 | The gcc concept of thread priorities is that they run at one of three
|
|---|
| 10 | levels; interactive, background, and low.
|
|---|
| 11 |
|
|---|
| 12 | Under mach, this is translated to:
|
|---|
| 13 |
|
|---|
| 14 | interactive -- set priority to maximum
|
|---|
| 15 | background -- set priority to 2/3 of maximum
|
|---|
| 16 | low -- set priority to 1/3 of maximum
|
|---|
| 17 |
|
|---|
| 18 | This means that it is possible for a thread with the priority of
|
|---|
| 19 | interactive to actually run at a lower priority than another thread
|
|---|
| 20 | with a background, or even low, priority if the developer has modified
|
|---|
| 21 | the maximum priority.
|
|---|
| 22 |
|
|---|
| 23 |
|
|---|
Note:
See
TracBrowser
for help on using the repository browser.
