per-process status

[giampaolo]

From g.rodola on December 27, 2010 15:34:37

This should be similar to STAT column of "ps aux" output and should return an 
integer or a (code, status_str) namedtuple reflecting the current process 
status (running, sleeping, etc...). On Linux this is available via /proc, as 
always, and the code->name mapping can be taken from fs/proc/array.c in the 
Linux kernel source code. 
http://www.takatan.net/lxr/source/fs/proc/array.c#L129 On FreeBSD we can use 
kinfo_proc, as always, but I'm still not sure where to take the name mappings. 
http://fxr.watson.org/fxr/source/sys/user.h#L110 No Idea about OSX and Windows. 
I'm cc-ing wj32.64 in case he knows something about Windows.

Either we choose to return an integer or a nametuple, it probably makes sense 
to expose constants such as psutil.PROC_STATUS_RUNNING, 
psutil.PROC_STATUS_STOPPED, etc. as well.

Original issue: http://code.google.com/p/psutil/issues/detail?id=143

[giampaolo]

From g.rodola on December 27, 2010 09:46:02

First draft for Linux and BSD committed as r871 and r872 .

It seems there's no concept of "process status" on Windows. 
We got threads instead, and a thread can be either in a "suspended" or 
"resumed"/"running" state.
I think we can say that a process can be either in a "running" or "suspended" 
state depending on the status of its threads.

Perhaps we might assume that a process is in a "suspended" state if one of its 
threads is supsended, else we can assume it's "running".
There's no API to easily determine such a thing but here are some suggestions: 
http://stackoverflow.com/questions/1006691/how-to-check-if-a-win32-thread-is-running-or-in-suspended-state
 Still not sure whether this is worth the effort, though.

[giampaolo]

From wj32...@gmail.com on December 27, 2010 12:10:48

You can do this easily by calling NtQuerySystemInformation. If you don't mind, 
I would like to do a rewrite of a lot of the functions to use the undocumented 
functions, as they are far easier to work with than the public ones.

[giampaolo]

From g.rodola on December 27, 2010 12:30:15

It's ok as long as we do not drop mingw32 support and tests keep passing also 
on 64 bit platforms.
If you're going to rewrite a lot of stuff it'b better if we split the work in 
separate tickets.

As for this specific feature feel free to provide a patch or just commit 
against the trunk (you have write access). As you want.

Is the assumption I made above correct btw? Does processes status on Windows 
work as I guessed?

[giampaolo]

From wj32...@gmail.com on December 30, 2010 20:18:46

Yes, that's correct. I don't have MinGW so I can't test the support for it. So 
maybe I won't do the rewrite...

[giampaolo]

From g.rodola on February 15, 2011 03:38:30

Some Windows instructions: 
http://vtopan.wordpress.com/2009/04/15/how-to-find-out-if-a-threadprocess-is-suspended-get-thread-state/

[giampaolo]

From g.rodola on February 17, 2011 02:33:21

Implemented on OSX in r917 .

Labels: Progress-3in4

[giampaolo]

From g.rodola on February 21, 2011 19:48:11

Implemented on Windows in r930 .
Thanks to wj32.64 for the help.

Status: FixedInSVN
Labels: -Progress-3in4 Progress-4in4

[giampaolo]

From g.rodola on February 28, 2011 13:56:01

Labels: Milestone-0.2.1

[giampaolo]

From g.rodola on March 20, 2011 14:55:37

Status: Fixed

[giampaolo]

From g.rodola on June 09, 2011 15:33:51

Labels: -OpSys-All

[giampaolo]

From g.rodola on March 02, 2013 03:57:44

Updated csets after the SVN -> Mercurial migration: r871 == revision 
0ce06bfb58fe r917 == revision 0a9131af50cc r930 == revision 2c1fe1a56d95