[TinyTut] - Change Thread Priority

[plusminus]

[align=center][TinyTut] - Change Thread Priority[/align]

What you learn: You will learn how to change the Thread-Priority of your Activity (Process). Possible field of use: Audio-Applications needing High-Priority Threads.

Difficulty: 2 of 5

Questions/Problems: Simply post below...

What it will look like:
[align=center]Nothing to see here...[/align]

Description:
0.) To raise the Thread-Priority of our Threads in our Activity we need a 'uses-permission' in the AndroidManifest.xml to do so:

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Using xml Syntax Highlighting

1. <uses-permission id="android.permission.RAISED_THREAD_PRIORITY"/>

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So now you can change/raise the Priority of any Thread within your Activity using the following code:

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Using java Syntax Highlighting

1. import android.os.Process;
2.  
3. // ...
4.  
5.  
6.  
7. // -----------------------------------
8.  
9. // Set the priority of the calling thread, based on Linux priorities:
10.  
11. // -----------------------------------
12.  
13.  
14.  
15. // Changes the Priority of the calling Thread!
16.  
17. Process.setThreadPriority(12);
18.  
19. // Changes the Priority of passed Thread (first param)
20.  
21. Process.setThreadPriority(Process.myTid(), 12);

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[align=center]:warning: Where the range is from -20 (high) to +19 (low). Choose not too high [/align]
The best is to use pre-defined constants from android.os.Process:

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Using java Syntax Highlighting

1. // Lower is 'more impotant'
2.  
3. Process.THREAD_PRIORITY_LOWEST = 19
4.  
5. Process.THREAD_PRIORITY_BACKGROUND = 5
6.  
7. Process.THREAD_PRIORITY_DEFAULT = 0
8.  
9. Process.THREAD_PRIORITY_FOREGROUND = -5
10.  
11. Process.THREAD_PRIORITY_DISPLAY = -10
12.  
13. Process.THREAD_PRIORITY_URGENT_DISPLAY = -15

Parsed in 0.030 seconds, using GeSHi 1.0.8.4

More detailed explanation on which Priority to use when.


Regards,
plusminus

[regulatre]

Does the Thread.setPriority work in the Android jvm? I'm actually starting my threads with Thread t = new Thread() {blah.......

And I can't find a way to use Process.setThreadPriority(tid,priority). But the Thread class does offer a setPriority(priority) method...

But according to this: http://www.javamex.com/tutorials/thread ... what.shtml
Thread priority can't be changed by non-root user, so it wouldn't work then in my app?