eesupp/src/exch_cycle_ebl.F

C $Header: $

      SUBROUTINE EXCH_CYCLE_EBL( myThid )
C     /==========================================================\
C     | SUBROUTINE EXCH_CYCLE_EBL                                |
C     | o Cycle exchange buffer level.                           |
C     |==========================================================|
C     | Step the "exchange buffer level" to next value.          |
C     | The buffer level is used to prevent consecutive messages |
C     | overwriting one another. Because we know that every tile |
C     | will participate in an exchange we can be sure that every|
C     | tile will cycle through the buffers with the same        |
C     | sequence. Also we know that a tile cannot start a new    |
C     | exchange before it has completed its end of the previous |
C     | exchange. Thus by cycling through three buffer levels we |
C     | can be sure that the buffer we write to will be free.    |
C     |  That is by the time we are participating in the third   |
C     | exchange transaction we know that both ends of the first |
C     | transaction must have completed.                         |
C     | Note --                                                  |
C     | 1. We allow more than three levels below although this   |
C     | is not necessary.                                        |
C     \==========================================================/
      IMPLICIT NONE
C     == Global data ==
#include "SIZE.h"
#include "EEPARAMS.h"
#include "EESUPPORT.h"
#include "EXCH.h"

C     == Routine arguments ==
C     myThid - Thread number of this instance of the routine
      INTEGER myThid

C     == Local variables ==
C     bi, bj - Loop counters
      INTEGER bi, bj

      DO bj=myByLo(myThid),myByHi(myThid)
       DO bi=myBxLo(myThid),myBxHi(myThid)
C--     Use next level exchange buffer in cycle.
        exchangeBufLevel(1,bi,bj) = exchangeBufLevel(1,bi,bj)+1
        IF ( exchangeBufLevel(1,bi,bj) .GT. NUMBER_OF_BUFFER_LEVELS )
     &   exchangeBufLevel(1,bi,bj) = 1
       ENDDO
      ENDDO

      RETURN
      END
1	cnh	1.1	C $Header: $
2
3			SUBROUTINE EXCH_CYCLE_EBL( myThid )
4			C /==========================================================\
5			C \| SUBROUTINE EXCH_CYCLE_EBL \|
6			C \| o Cycle exchange buffer level. \|
7			C \|==========================================================\|
8			C \| Step the "exchange buffer level" to next value. \|
9			C \| The buffer level is used to prevent consecutive messages \|
10			C \| overwriting one another. Because we know that every tile \|
11			C \| will participate in an exchange we can be sure that every\|
12			C \| tile will cycle through the buffers with the same \|
13			C \| sequence. Also we know that a tile cannot start a new \|
14			C \| exchange before it has completed its end of the previous \|
15			C \| exchange. Thus by cycling through three buffer levels we \|
16			C \| can be sure that the buffer we write to will be free. \|
17			C \| That is by the time we are participating in the third \|
18			C \| exchange transaction we know that both ends of the first \|
19			C \| transaction must have completed. \|
20			C \| Note -- \|
21			C \| 1. We allow more than three levels below although this \|
22			C \| is not necessary. \|
23			C \==========================================================/
24			IMPLICIT NONE
25			C == Global data ==
26			#include "SIZE.h"
27			#include "EEPARAMS.h"
28			#include "EESUPPORT.h"
29			#include "EXCH.h"
30
31			C == Routine arguments ==
32			C myThid - Thread number of this instance of the routine
33			INTEGER myThid
34
35			C == Local variables ==
36			C bi, bj - Loop counters
37			INTEGER bi, bj
38
39			DO bj=myByLo(myThid),myByHi(myThid)
40			DO bi=myBxLo(myThid),myBxHi(myThid)
41			C-- Use next level exchange buffer in cycle.
42			exchangeBufLevel(1,bi,bj) = exchangeBufLevel(1,bi,bj)+1
43			IF ( exchangeBufLevel(1,bi,bj) .GT. NUMBER_OF_BUFFER_LEVELS )
44			& exchangeBufLevel(1,bi,bj) = 1
45			ENDDO
46			ENDDO
47
48			RETURN
49			END