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Revision 68994912262e9c2ae98bff7968c23cd4cc8b9e8b authored by Martin Schlather on 24 August 2008, 00:00:00 UTC, committed by Gabor Csardi on 24 August 2008, 00:00:00 UTC
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  The function \code{FileExists} checks whether a file or a lock-file

  The function \code{LockRemove} removes a lock-file
   FileExists(file, PrintLevel=RFparameters()$Print)

  \item{file}{name of the data file}
  \item{PrintLevel}{if \code{PrintLevel<=1} no messages are displayed}

  \code{FileExists} checks whether file or file.lock exists. 
  If none of them exists \code{file}.lock is created and hostname and
  PID are written into \code{file}.lock.  This is useful if several processes
  use the same directory.  Further, it is checked whether another process
  has tried to create the same file in the same instance.  In this case
  \code{FileExists} returns for at least one of the processes that
  \code{file}.lock has already been created.

  \code{FileExists} returns
  \item{1}{if \code{file} already exists}
  \item{2}{if \code{file}.lock already exists}
  \item{3}{if \code{file}.lock was tried to be created, but another process
    inferred and got priority}
  \item{0}{otherwise, \code{file} and \code{file}.lock did not exist and
    \code{file}.lock has been created}

\author{Martin Schlather, \email{martin.schlather@math.uni-goettingen.de}


%  LocalWords:  FileExists LockRemove PrintLevel RFparameters PID Schlather url
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