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function locked = parallelLock(id, varargin)
% PARALLELLOCK
%
% Author:: Andrea Vedaldi
% AUTORIGHTS
% Copyright (C) 2008-09 Andrea Vedaldi
%
% This file is part of the VGG MKL Class and VGG MKL Det code packages,
% available in the terms of the GNU General Public License version 2.
jobopts.parallelize = 0 ;
jobopts.jobId = NaN ;
jobopts.taskId = NaN ;
jobopts.jobDir = '' ;
jobopts.waitJobs = [] ;
jobopts.numNodes = 50 ;
jobopts.waitJobs = [] ;
jobopts.freeMemMb = 1900 ;
jobopts = vgg_argparse(jobopts, varargin) ;
% get who is calling me
drop = dbstack ;
callingMFile = drop(2).name ;
clear drop ;
useLockServer = 1 ;
% --------------------------------------------------------------------
% If not parallel
% --------------------------------------------------------------------
if ~ jobopts.parallelize
locked = true ;
return ;
end
% --------------------------------------------------------------------
% If parallel, and taskId is specified
% --------------------------------------------------------------------
if ~isnan(jobopts.taskId)
if ~useLockServer
% This is a genuine parallel instance
jobDir = jobopts.jobDir ;
jobId = jobopts.jobId ;
jobName = sprintf('j%d-%s', jobId, callingMFile) ;
lockDir = fullfile(jobDir, jobName, 'locks') ;
% try to acquire lock
lockPath = fullfile(lockDir, sprintf('%06d.lock', id)) ;
if exist(lockPath, 'file')
fprintf('''%s'' already locked.\n', lockPath) ;
locked = false ;
return ;
end
system(sprintf('touch "%s"', lockPath)) ;
fprintf('Acquired lock ''%s''.\n', lockPath) ;
else
locked = tinyLockClient('adam.robots.ox.ac.uk', '2000', sprintf('%d.%d', jobopts.jobId, id)) ;
return ;
end
locked = true ;
return ;
end
% --------------------------------------------------------------------
% If parallel, and taskId is not specified
% --------------------------------------------------------------------
% This is the controller process only
locked = false ;
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