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Unix process states

 
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Old 02-21-2012
Question Unix process states
I am trying to write my own Unix compliant (SUSv4) OS - Just a hobby OS, nothing serious. While going through the standard, I couldn't find any explicit information on process states. What I could find was (excluding the real-time considerations)-

Quote:
# 3.444 Zombie Process
A process that has terminated and that is deleted when its exit status has been reported to another process which is waiting for that process to terminate.

#4.1.4 Scheduling Policy
A scheduling policy affects process or thread ordering:
- When a process or thread is a running thread and it becomes a blocked thread
- When a process or thread is a running thread and it becomes a preempted thread
- When a process or thread is a blocked thread and it becomes a runnable thread
- When a running thread calls a function that can change the priority or scheduling policy of a process or thread
- In other scheduling policy-defined circumstances
From this it can be inferred that the following process states might exist-
RUNNING, BLOCKED, PREEMPTED, RUNNABLE, ZOMBIE

I was wondering whether the Unix specification gives something more detailed?

If not, does any implementation of the above criteria meet the specification? Or is there something more?
 
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mysql_zap

MYSQL_ZAP(1)						       MySQL Database System						      MYSQL_ZAP(1)

NAME

       mysql_zap - kill processes that match a pattern

SYNOPSIS

       mysql_zap [-signal] [-?Ift] pattern

DESCRIPTION

       mysql_zap kills processes that match a pattern. It uses the ps command and Unix signals, so it runs on Unix and Unix-like systems.

       Invoke mysql_zap like this:

	   shell> mysql_zap [-signal] [-?Ift] pattern

       A process matches if its output line from the ps command contains the pattern. By default, mysql_zap asks for confirmation for each
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       If the -signal option is given, it specifies the name or number of the signal to send to each process. Otherwise, mysql_zap tries first
       with TERM (signal 15) and then with KILL (signal 9).

       mysql_zap supports the following additional options:

       o   --help, -?, -I

	   Display a help message and exit.

       o   -f

	   Force mode.	mysql_zap attempts to kill each process without confirmation.

       o   -t

	   Test mode. Display information about each process but do not kill it.

COPYRIGHT

       Copyright 2007-2008 MySQL AB, 2008-2010 Sun Microsystems, Inc.

       This documentation is free software; you can redistribute it and/or modify it only under the terms of the GNU General Public License as
       published by the Free Software Foundation; version 2 of the License.

       This documentation is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

       You should have received a copy of the GNU General Public License along with the program; if not, write to the Free Software Foundation,
       Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or see http://www.gnu.org/licenses/.

SEE ALSO

       For more information, please refer to the MySQL Reference Manual, which may already be installed locally and which is also available online
       at http://dev.mysql.com/doc/.

AUTHOR

       Sun Microsystems, Inc. (http://www.mysql.com/).

MySQL 5.1							    04/06/2010							      MYSQL_ZAP(1)