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function wasRunning = StartUpdateProcess
% wasRunning = StartUpdateProcess
%
% OS X: ___________________________________________________________________
%
% If the OS X update process is running then just return 1. Otherwise
% start the update process and return 0.
%
% Because the update process runs as root, StartUpdateProcess requires a
% password be entered.
%
% Note that StartUpdateProcess first checks to be sure that the update
% process is running before launching one, so there is no danger of it
% starting an additional update process if one is already running
%
% OS 9: ___________________________________________________________________
%
% StartUpdateProcess does not exist in OS 9.
%
% WINDOWS: ________________________________________________________________
%
% StartUpdateProcess does not exist in Windows.
%
% _________________________________________________________________________
%
% see also: IsUpdateRunning, Rush, Priority
% HISTORY
% 1/8/04 awi Wrote it.
% 7/15/04 awi Improved documentation.
%first check to see if the update process is running
wasRunning=IsUpdateRunning;
if wasRunning>1
% This should never happen.
warning('More than one update process is running. There should be only one.');
return;
elseif wasRunning==1
return;
else % it was not running
% fprintf('The OS X system update process has been halted to prevent interruption of MATLAB during "Rush" and "Priority" commands.\n');
% fprintf('If the update process is not running then the Psychtoolbox automatically restarts the update process when MATLAB\n');
% fprintf('exits. Starting the MATLAB process requires the system administrator password. To restart update process, enter\n');
% fprintf('the system administrator password at the prompt. You can also start the update process by entering at the\n');
% fprintf('Terminal shell prompt:\n');
% fprintf('\tsudo update\n');
% fprintf('From the shell you can check to see if the update process is running by issueing the command:\n');
% fprintf('\tps -awx | grep update\n');
% fprintf('\n');
unix('sudo /usr/sbin/update');
end
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