spmd_igath.F

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!||====================================================================
!||    spmd_igath            ../engine/source/mpi/anim/spmd_igath.F
!||--- called by ------------------------------------------------------
!||    aniskew               ../engine/source/output/anim/generate/aniskew.F
!||    aniskewf              ../engine/source/output/anim/generate/aniskewf.F
!||    dsphnor               ../engine/source/output/anim/generate/dsphnor.F
!||--- calls      -----------------------------------------------------
!||--- uses       -----------------------------------------------------
!||    spmd_comm_world_mod   ../engine/source/mpi/spmd_comm_world.f90
!||====================================================================
      SUBROUTINE spmd_igath(SRBUF,LEN,LRECV)
C-----------------------------------------------
C   I m p l i c i t   T y p e s
C-----------------------------------------------
        USE spmd_comm_world_mod, ONLY : spmd_comm_world
#include      "implicit_f.inc"
C-----------------------------------------------------------------
C   M e s s a g e   P a s s i n g
C-----------------------------------------------
#include "spmd.inc"
C-----------------------------------------------
C   C o m m o n   B l o c k s
C-----------------------------------------------
#include      "com01_c.inc"
#include      "task_c.inc"
C-----------------------------------------------
C   D u m m y   A r g u m e n t s
C-----------------------------------------------
      INTEGER SRBUF(*), LEN, LRECV
C-----------------------------------------------
C   L o c a l  V a r i a b l e s
C-----------------------------------------------
#ifdef MPI
      INTEGER MSGOFF,MSGOFF2,MSGTYP,INFO,I,K,ATID,ATAG,ALEN,RLEN,S1
      INTEGER STATUS(MPI_STATUS_SIZE),IERROR
      DATA msgoff/7013/
      DATA msgoff2/7068/
C-----------------------------------------------
C   S o u r c e  L i n e s
C-----------------------------------------------
      s1 = 1
      IF (ispmd/=0) THEN
        msgtyp=msgoff2
 
        CALL mpi_send(len,s1,mpi_integer,
     .                it_spmd(1),msgtyp,
     .                spmd_comm_world,ierror)
 
        msgtyp=msgoff
        IF(len > 0 ) THEN
          CALL mpi_send(srbuf,len,mpi_integer,
     .                it_spmd(1),msgtyp,
     .                spmd_comm_world,ierror)
        ENDIF
 
      ELSE
 
        lrecv = len
 
        DO i=2,nspmd
            msgtyp=msgoff2
            CALL mpi_recv(rlen,s1,mpi_integer,
     .                    it_spmd(i),msgtyp,
     .                    spmd_comm_world,status,ierror)
            msgtyp=msgoff
 
            IF(rlen > 0 ) THEN
              ! Even though Receive of length = 0 can cost nothing
              ! SRBUF(LRECV+1) must exist
              CALL mpi_recv(srbuf(lrecv+1),rlen,mpi_integer,
     .                    it_spmd(i),msgtyp,
     .                    spmd_comm_world,status,ierror)
 
            ENDIF
            lrecv = lrecv + rlen 
 
        END DO
 
      ENDIF
C
#endif
      RETURN
      END