removefilesemaphore(semaphore)

function removefilesemaphore(semaphore)
%REMOVEFILESEMAPHORE  Remove semaphore after file access.
%		REMOVEFILESEMAPHORE(SEMAPHORE) removes the semaphore(s) set by function
%		SETFILESEMAPHORE to allow file access for other Matlab processes.
%
%		Example:
%		sem = setfilesemaphore('test.mat');
%		% access file test.mat here
%		dir test.mat.semaphore.*
%		removefilesemaphore(sem);
%
%		Markus Buehren
%		Last modified 21.12.2008
%
%		See also SETFILESEMAPHORE.

checkWaitTime = 0.1;

% remove semaphore files
for fileNr = 1:length(semaphore)
	if existfile(semaphore{fileNr})
		
			% do not use function deletewithsemaphores.m here!
			
			% sometimes deletion permission is not given, so try several times to
			% delete the file

			warnID = 'MATLAB:DELETE:Permission';
			warnState = warning('query', warnID);
			warning('off', warnID);

		fileDeleted = false;
		for attemptNr = 1:10
				lastwarn('');
			try
				delete(semaphore{fileNr}); %% file access %%
				if isempty(lastwarn)
					fileDeleted = true;
					break
				end
			catch
				% wait before checking again
				pause(checkWaitTime);
			end
			end
			warning(warnState);

			if ~fileDeleted
				% try one last time with display of warning message
				delete(semaphore{fileNr});

		end
	end
end