Revision da8174e204c4b3c8aff0fa179a0b53656129ef8e authored by Martin Schlather on 01 March 2004, 00:00:00 UTC, committed by Gabor Csardi on 01 March 2004, 00:00:00 UTC
1 parent 3e1677b
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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 was created}

\author{Martin Schlather, \email{}


%  LocalWords:  FileExists LockRemove PrintLevel RFparameters PID Schlather url
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