#include "PP81_OPTIONS.h"

CBOP
C     !ROUTINE: PP81_OUTPUT
C     !INTERFACE:
      SUBROUTINE PP81_OUTPUT( myTime, myIter, myThid )

C     !DESCRIPTION: \bv
C     *==========================================================*
C     | SUBROUTINE PP81_OUTPUT
C     | o Do PP81 diagnostic output.
C     *==========================================================
C     | The following CPP flag (MULTIPLE_RECORD_PP81_STATE_FILES) is
C     | #define/#undefed here since it is specific to this routine
C     | and very user-preference specific.
C     |
C     | If #undefed (default) the state files are written as in all versions
C     | prior to checkpoint32, where a file is created per variable, per time
C     | and per tile. This *has* to be the default because most users use this
C     | mode and all utilities and scripts (diagnostic) assume this form.
C     | It is also robust, as explained below.
C     |
C     | If #defined, subsequent snap-shots are written as records in the
C     | same file (no iteration number in filenames).
C     | Advantages: - fewer files
C     |       - for small problems, is easy to copy the output around
C     | Disadvantages:
C     |       - breaks a lot of diagnostic scripts
C     |       - for large or long problems this creates huge files
C     |       - is an unexpected, unsolicited change in behaviour which came
C     |         as a surprise (in c32) and inconvenience to several users
C     |       - can not accomodate changing the frequency of output
C     |         after a pickup (this is trivial in previous method
C     |         but needs new code and parameters in this new method)
C     *==========================================================*
C     \ev

C     !USES:
      IMPLICIT NONE
C     === Global variables ===
#include "SIZE.h"
#include "EEPARAMS.h"
#include "PARAMS.h"
#include "PP81.h"

C     !INPUT/OUTPUT PARAMETERS:
C     == Routine arguments ==
C     myTime :: my time in simulation ( s )
C     myIter :: my Iteration number
C     myThid :: my Thread Id number
      _RL     myTime
      INTEGER myIter
      INTEGER myThid

#ifdef ALLOW_PP81

C     !FUNCTIONS:
      LOGICAL  DIFFERENT_MULTIPLE
      EXTERNAL DIFFERENT_MULTIPLE

C     !LOCAL VARIABLES:
C     == Local variables ==
      CHARACTER*(10) suff
CEOP

C----------------------------------------------------------------
C     Dump snapshot of PP variables.
C----------------------------------------------------------------

      IF ( myIter.NE.nIter0 .AND.
     &     DIFFERENT_MULTIPLE( PPdumpFreq, myTime, deltaTClock )
     &   ) THEN

       IF (PPwriteState) THEN
C       Write each snap-shot as a new file
        IF ( rwSuffixType.EQ.0 ) THEN
          WRITE(suff,'(I10.10)') myIter
        ELSE
          CALL RW_GET_SUFFIX( suff, myTime, myIter, myThid )
        ENDIF
        CALL WRITE_FLD_XYZ_RL('PPviscAr.',suff,PPviscAr,
     &       myIter,myThid)
        CALL WRITE_FLD_XYZ_RL('PPdiffKr.',suff,PPdiffKr,
     &       myIter,myThid)
       ENDIF

      ENDIF

#endif /* ALLOW_PP81 */

      RETURN
      END
