source: trunk/WRF.COMMON/WRFV3/external/RSL_LITE/buf_for_proc.c

/***********************************************************************
     
                              COPYRIGHT
     
     The following is a notice of limited availability of the code and 
     Government license and disclaimer which must be included in the 
     prologue of the code and in all source listings of the code.
     
     Copyright notice
       (c) 1977  University of Chicago
     
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     derivative works, and to redistribute to others at no charge.  If 
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             it must include the copyright notice and Government       
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          b) You must cause the modified Software to carry prominent   
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             the Software.
     
     This software was authored by:
     
     Argonne National Laboratory
     J. Michalakes: (630) 252-6646; email: michalak@mcs.anl.gov
     Mathematics and Computer Science Division
     Argonne National Laboratory, Argonne, IL  60439
     
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                      GOVERNMENT LICENSE AND DISCLAIMER
     
     This computer code material was prepared, in part, as an account 
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***************************************************************************/

#ifndef MS_SUA
# include <stdio.h>
#endif
#include <stdlib.h>
#include "rsl_lite.h"
#ifndef STUBMPI
#  include "mpi.h"
#endif

typedef struct bufdesc {
  char * buf ;
  int size ;
} bufdesc_t ;

/* buftab[RSL_SENDBUF] is send buffer descriptor,
   buftab[RSL_RECVBUF] is recv buffer descriptor. */
static bufdesc_t buftab[2][RSL_MAXPROC] ;
static int first = 1 ;

/* 
   buffer_for_proc

   returns a pointer to a buffer already allocated for processor P if
   it is big enough; otherwise, it frees the existing buffer, if there
   is one and then allocates a new one that is big enough.  If RSL_FREEBUF
   is called for a P, the two buffers (send and recv) are truncated and
   freed and NULL is returned.

   You are guaranteed to get back the same buffer as the previous call
   for a given P, as long as the size is less than the size passed to
   the previous call.  Thus, you can use this routine to manage the
   pointers to the buffers for P and avoid having to set up arrays
   of pointers in the routines that use these buffers.

*/

char *
buffer_for_proc( P, size, code )
  int P ;   /* processor number */
  int size,             /* requested size */
      code ;            /* RSL_SENDBUF, RSL_RECVBUF, or RSL_FREEBUF */
{
  int p ;
  int i, j ;
  char mess[1024] ;
  char * ret ;

  ret = NULL ;
  if ( first )
  {
    for ( p = 0 ; p < RSL_MAXPROC ; p++ )
    {
      buftab[0][p].buf  = NULL ;    
      buftab[1][p].buf  = NULL ;    
      buftab[0][p].size = 0 ;    
      buftab[1][p].size = 0 ;    
    }
    first = 0 ;
  }
  if ( P < 0 || P >= RSL_MAXPROC )
  {
    sprintf(mess,"Bad P argument to buffer_for_proc.  P = %d. Has RSL_MESH been called?\n",P) ;
    RSL_TEST_ERR( 1, mess ) ;
  }
  if ( code == RSL_FREEBUF )
  {
/* fprintf(stderr,"buffer_for_proc freeing buffer %d\n",P) ; */
    if ( buftab[0][P].buf != NULL ) RSL_FREE( buftab[0][P].buf ) ;
    if ( buftab[1][P].buf != NULL ) RSL_FREE( buftab[1][P].buf ) ;
    buftab[0][P].buf  = NULL ;    
    buftab[1][P].buf  = NULL ;    
    buftab[0][P].size = 0 ;    
    buftab[1][P].size = 0 ;    
/* show_tot_size() ; */
  }
  else if ( code == RSL_SENDBUF || code == RSL_RECVBUF )
  {
    if ( buftab[code][P].size < size )
    {
#if 0
fprintf(stderr,"buffer_for_proc %s %d : was %d, increasing to %d\n",
         (code == RSL_SENDBUF)?"RSL_SENDBUF":"RSL_RECVBUF",
         P,buftab[code][P].size, size+512) ;
#endif
      if ( buftab[code][P].buf != NULL ) RSL_FREE( buftab[code][P].buf ) ;
      buftab[code][P].buf = RSL_MALLOC(char,size+512) ;
      buftab[code][P].size = size+512 ;
/* show_tot_size() ; */
    }
    ret = buftab[code][P].buf ;
  }
  return(ret) ;
}

show_tot_size()
{
  int P ;
  int acc ;
  acc = 0 ;
  for ( P = 0 ; P < RSL_MAXPROC ; P++ )
  {
    acc += buftab[0][P].size ;
    acc += buftab[1][P].size ;
  }
#ifndef MS_SUA
  fprintf(stderr,"Total bytes allocated for buffers: %d\n", acc ) ;
#endif
}

int
buffer_size_for_proc( P, code )
  int P ;
  int code ;
{
  return( buftab[code][P].size ) ;
}