RFLO_RandomInit.F90

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!******************************************************************************
!
! Purpose: Initializes random number generator in each region
!
! Description: none.
!
! Input:  does not use any data already present
!
! Output: regions(:)%randData is initialized
!
! Notes:
!
!   Uses positive seeds.
!
!   The seed 0 is forbidden; negative seeds are used for unstructured regions.
!
!******************************************************************************
!
! $Id: RFLO_RandomInit.F90,v 1.4 2008/12/06 08:44:07 mtcampbe Exp $
!
! Copyright: (c) 2003 by the University of Illinois
!
!******************************************************************************

SUBROUTINE rflo_randominit( regions )

  USE moddatatypes
  USE moddatastruct, ONLY : t_region
  USE modglobal,     ONLY : t_global
  USE modrandom,     ONLY : randomseed
  USE moderror
  USE modparameters
  IMPLICIT NONE

! ... parameters
  TYPE(t_region), POINTER :: regions(:)

! ... loop variables
  INTEGER :: ireg

! ... local variables
  INTEGER :: iclock1,seed,seedclock
  TYPE(t_global), POINTER :: global

!******************************************************************************

  global => regions(1)%global

  CALL registerfunction( global,'RFLO_RandomInit',&
  'RFLO_RandomInit.F90' )

! ******************************************************************************
! Set seed type
! ******************************************************************************

  SELECT CASE(global%randSeedType)
    CASE(rand_seed_type_fixed)
      seedclock = 0
    CASE(rand_seed_type_clock)
      CALL system_clock(iclock1)
      seedclock = iclock1
  END SELECT ! global%randSeedType

! ******************************************************************************
! Loop over regions
! ******************************************************************************

  DO ireg=1,global%nRegions
    IF (regions(ireg)%procid==global%myProcid .AND. &   ! region active and
        regions(ireg)%active==active) THEN              ! on my processor
      seed = ireg + global%nRegions * global%randSeedOffset +seedclock
      IF (seed <= 0) THEN  ! RFLO seeds must be positive
        CALL errorstop( global,err_illegal_value,__line__ )
      ENDIF
      CALL randomseed(seed,regions(ireg)%randData)
    ENDIF ! procid
  ENDDO

! finalize

  CALL deregisterfunction( global )

END SUBROUTINE rflo_randominit

!******************************************************************************
!
! RCS Revision history:
!
! $Log: RFLO_RandomInit.F90,v $
! Revision 1.4  2008/12/06 08:44:07  mtcampbe
! Updated license.
!
! Revision 1.3  2008/11/19 22:17:20  mtcampbe
! Added Illinois Open Source License/Copyright
!
! Revision 1.2  2005/12/01 17:25:04  fnajjar
! Added capability for clock-based random seed
!
! Revision 1.1  2004/11/29 21:25:16  wasistho
! lower to upper case
!
! Revision 1.3  2003/11/21 22:30:04  fnajjar
! Added global seed offset for Random Number Generator
!
! Revision 1.2  2003/05/15 02:57:01  jblazek
! Inlined index function.
!
! Revision 1.1  2003/02/17 19:31:11  jferry
! Implemented portable random number generator ModRandom
!
!******************************************************************************