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function wasRunning=KillUpdateProcess
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% wasRunning=KillUpdateProcess
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% OS X: ___________________________________________________________________
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% Kill the OS X update daemon. Killing update prevents interruption of
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% MATLAB at 30-second intervals, enabling the Psychtoolbox to run smooth,
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% uninterrupted animations.
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% Use Priority or Rush instead of KillUpdateProcess; You need not invoke
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% KillUpdateProcess directly from your scripts because Priority and Rush do
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% IMPORTANT: When first installing the Psychtoolbox on your computer, run
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% the included simplepsychtoolboxsetup.sh script from an OS X terminal
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% window. By modifying system file "/etc/sudoers"
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% simplepsychtoolboxsetup.sh gives MATLAB permission to shutdown the OS X
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% update process. KillUpdateProcess will detect if MATLAB does not have
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% permission to kill the update process and prompt you to run
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% simplepsychtoolboxsetup.sh.
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% KillUpdateProcess first checks to see if an update process is running. If
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% no update process is running, then KillUpdateProcess returns value 0 to
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% indicate that no update process was running. If an update process is
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% running, then KillUpdateProcess kills the update process, reads the jobs
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% list to verify that update was indeed killed, and returns value 1 to
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% indicate that update was running. If KillUpdateProcess can not kill
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% update because simplepsychtoolboxsetup.sh has not been run, then it
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% prompts within the MATLAB command window to run
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% simplepsychtoolboxsetup.sh, opens a terminal window, and issues
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% To insure that MATLAB does not exit without restarting the update
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% process, The Psychtoolbox script finish.m, which MATLAB automatically
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% calls when exiting MATLAB, invokes StartUpdateProcess. KillUpdateProcess
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% will fail to kill update if it does not detect a finish.m file on the
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% MATLAB path which contains a call to StartUpdateProcess.
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% KillUpdateProcess will fail to kill update under any of these conditions:
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% - There is no finish.m file on the MATLAB path
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% - There is more than one finish.m file on the MATLAB path
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% - There is a single finish.m file on the MATLAB path but it does not
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% contain a StartUpdateProcess call.
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% - The system "/etc/sudoers" file does not give MATLAB permission to
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% shutdown update. If KillUpdateProcess detects that
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% simplepsychtoolboxsetup.sh has not been run, then it reports this, prompts
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% to run simplepsychtoolboxsetup.sh, and returns the value Nan.
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% The OS X update process is part of its BSD Unix foundation. For more
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% information on update, see the Unix manual page for update. (Enter "man
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% update" in the OS X Terminal window.)
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% OS 9: ___________________________________________________________________
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% KillUpdateProcess does not exist in OS 9.
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% WINDOWS: ________________________________________________________________
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% KillUpdateProcess does not exist in Windows.
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% _________________________________________________________________________
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% See also: StartUpdateProcess, KillUpdateProcess, IsUpdateRunning
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% 1/8/04 awi Wrote it.
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% 1/16/04 awi Improved comments. Added AssertOSX.
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% Consider changing this to AssertUnix.
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% 1/16/04 awi Replaced kill line.
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% 8/21/05 awi Return Nan in case of no permission to shutdown update.
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% 8/22/05 awi Prepended explanation to notice that "Priority" evoked it.
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% 8/24/05 awi Deleted from help text paragraph stating that KillUpdateProcess
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% requests su password. Mario's script which modifies the
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% sudoers file obviates that.
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% Explained simplepsychtoolboxsetup.sh in help.
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% 10/10/05 awi Merged with dgp version: changed "strcmp" to "streq"
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% A better solution to the problem of insurring that the update process is
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% eventually restored would be to provide a Cocoa application, launched by
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% KillUpdateDameon, which checked for update and nagged if it went
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% undetected for a time. If MATLAB were found to be not running it would
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% make sure that update was running. The same application could handle
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% starting and stopping update. Even if the app did not
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% handle starting and stopping, this scheme could be made foolproof (for
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% reasonable levels of foolishness) if the app would not exit unless update
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% was running and matlab would not kill update unless the app were running.
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% That way alwyas either update is running or the update restoration app is
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% running. This update gurantor app could also have time limit after which
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% it will restart update even if MATLAB were running. Perhaps it could
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% decide this on the basis of MATLAB idle time?
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% check that the shell script to give everyone permission to shut down and
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% restart the update process has been run. It leaves its mark by backing
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% up the /etc/sudoers file into /etc/sudoers_pre_psychtoolbox. This is
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% not a perfect test, because someone could modify /etc/sudoers without
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% deleting the /etc/sudoers_pre_psychtoolbox file. However, we can not
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% examine the contents of sudoers without root.
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if exist('/etc/sudoers_pre_psychtoolbox')~=2
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fprintf(' This message has been triggered by an attempt to raise priority of the MATLAB \n');
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fprintf(' process above level 0. If you did not call "Priority" or "Rush" directly from the\n');
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fprintf(' MATLAB command line, then it may have been called within another script or function\n');
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fprintf(' which you did call\n');
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fprintf(' In order to use raise priority on OS X you first need to run the script\n');
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fprintf(' simplepsychtoolboxsetup.sh from the OS X Terminal command line. In OS X,\n');
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fprintf(' Priority and Rush commands require shutting down the system "update" process\n');
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fprintf(' for as long as priority remains above 0. Shutting down update ordinarily\n');
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fprintf(' requires entering an administrator password. However, the Psychtoolbox\n');
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fprintf(' includes a shell script which will reconfigure your computer to allow MATLAB\n');
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fprintf(' to shutdown update without having to enter a password. Examining your /etc\n');
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fprintf(' directory, the absence of file "sudoers_pre_psychtoolbox " seems to indicate that\n');
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fprintf(' you have not run the simplepsychtoolboxsetup.sh script since installing\n');
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fprintf(' the Psychtoolbox.\n\n');
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fprintf(' Should I open a terminal window and give instructions ');
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yn=input(' [Y/N]? ','s');
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goAhead=streq(upper(yn), 'Y') || streq(upper(yn), 'YES');
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exitOut=streq(upper(yn), 'N') || streq(upper(yn), 'NO');
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keepAsking= ~(goAhead || exitOut);
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unix('open -a Terminal');
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fprintf('\n\n\nInstructions for calling the simplepsychtoolboxsetup.sh script within the\n');
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fprintf('terminal window:\n\n');
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fprintf('1. Find the full path to the simplepsychtoolboxsetup.sh script on your\n');
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fprintf(' hard drive. For example, if you keep your Psychtoolbox folder inside\n');
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fprintf(' your applications folder, then the path would be:\n');
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fprintf(' /Applications/Psychtoolbox/PsychContributed\n\n');
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fprintf('2. Use the unix cd command to move to the PsychContributed directory. For example:\n');
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fprintf(' cd /Applications/Psychtoolbox/PsychContributed\n\n');
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fprintf('3. Invoke the simplepsychtoolboxsetup.sh script using Sudo. You will then be\n');
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fprintf(' prompted to enter an administrator password. For example:\n');
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fprintf(' sudo ./simplepsychtoolboxsetup.sh\n\n\n');
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fprintf(' If you successfully run the simplepsychtoolboxsetup.sh script after installing\n');
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fprintf(' the Psychtoolbox, then you should thereafter be able to raise priority\n');
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% check that the command to restart update is implanted in the finish file
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if ~IsStartUpdateImplantedInFinish
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error('Killing the update process first requires that StartUpdateProcess be called from the finish.m file. See "help KillUpdateProcess".');
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p=GetProcessDescriptorFromCommandName('update');
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error('Multiple processes with command name "update" detected. This is unexpected.');
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else %there is only one update process
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% unix([ 'sudo kill ' int2str(p.pid) ]);
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unix('sudo /usr/bin/killall update');
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pause(1); %allow OS X lots of time to shut down update before checking.
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p=GetProcessDescriptorFromCommandName('update');
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%allow OS X lots more time to shut down update before checking.
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p=GetProcessDescriptorFromCommandName('update');
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error('Failed to kill the update process');
added
removed
Psychtoolbox/PsychPriority/KillUpdateProcess.m
