text: /* -*- Mode: C; c-basic-offset:4 ; -*- */
  /* 
   *   $Id$    
   *
   *   Copyright (C) 1997 University of Chicago. 
   *   See COPYRIGHT notice in top-level directory.
   */
  
  #include "mpioimpl.h"
  
  #ifdef HAVE_WEAK_SYMBOLS
  
  #if defined(HAVE_PRAGMA_WEAK)
  #pragma weak MPI_File_read_at_all_begin = PMPI_File_read_at_all_begin
  #elif defined(HAVE_PRAGMA_HP_SEC_DEF)
  #pragma _HP_SECONDARY_DEF PMPI_File_read_at_all_begin MPI_File_read_at_all_begin
  #elif defined(HAVE_PRAGMA_CRI_DUP)
  #pragma _CRI duplicate MPI_File_read_at_all_begin as PMPI_File_read_at_all_begin
  /* end of weak pragmas */
  #endif
  
  /* Include mapping from MPI->PMPI */
  #define MPIO_BUILD_PROFILING
  #include "mpioprof.h"
  #endif
  
  /*@
      MPI_File_read_at_all_begin - Begin a split collective read using explict offset
  
  Input Parameters:
  . fh - file handle (handle)
  . offset - file offset (nonnegative integer)
  . count - number of elements in buffer (nonnegative integer)
  . datatype - datatype of each buffer element (handle)
  
  Output Parameters:
  . buf - initial address of buffer (choice)
  
  .N fortran
  @*/
  int MPI_File_read_at_all_begin(MPI_File fh, MPI_Offset offset, void *buf,
                           int count, MPI_Datatype datatype)
  {
      int error_code, datatype_size;
  #ifndef PRINT_ERR_MSG
      static char myname[] = "MPI_FILE_READ_AT_ALL_BEGIN";
  #endif
      MPI_Status status;
  
  #ifdef PRINT_ERR_MSG
      if ((fh <= (MPI_File) 0) || (fh->cookie != ADIOI_FILE_COOKIE)) {
  	FPRINTF(stderr, "MPI_File_read_at_all_begin: Invalid file handle\n");
  	MPI_Abort(MPI_COMM_WORLD, 1);
      }
  #else
      ADIOI_TEST_FILE_HANDLE(fh, myname);
  #endif
  
      if (offset < 0) {
  #ifdef PRINT_ERR_MSG
  	FPRINTF(stderr, "MPI_File_read_at_all_begin: Invalid offset argument\n");
  	MPI_Abort(MPI_COMM_WORLD, 1);
  #else
  	error_code = MPIR_Err_setmsg(MPI_ERR_ARG, MPIR_ERR_OFFSET_ARG,
  				     myname, (char *) 0, (char *) 0);
  	return ADIOI_Error(fh, error_code, myname);	    
  #endif
      }
  
      if (count < 0) {
  #ifdef PRINT_ERR_MSG
  	FPRINTF(stderr, "MPI_File_read_at_all_begin: Invalid count argument\n");
  	MPI_Abort(MPI_COMM_WORLD, 1);
  #else
  	error_code = MPIR_Err_setmsg(MPI_ERR_ARG, MPIR_ERR_COUNT_ARG,
  				     myname, (char *) 0, (char *) 0);
  	return ADIOI_Error(fh, error_code, myname);
  #endif
      }
  
      if (datatype == MPI_DATATYPE_NULL) {
  #ifdef PRINT_ERR_MSG
          FPRINTF(stderr, "MPI_File_read_at_all_begin: Invalid datatype\n");
          MPI_Abort(MPI_COMM_WORLD, 1);
  #else
  	error_code = MPIR_Err_setmsg(MPI_ERR_TYPE, MPIR_ERR_TYPE_NULL,
  				     myname, (char *) 0, (char *) 0);
  	return ADIOI_Error(fh, error_code, myname);	    
  #endif
      }
  
      if (fh->access_mode & MPI_MODE_SEQUENTIAL) {
  #ifdef PRINT_ERR_MSG
          FPRINTF(stderr, "MPI_File_read_at_all_begin: Can't use this function because file was opened with MPI_MODE_SEQUENTIAL\n");
          MPI_Abort(MPI_COMM_WORLD, 1);
  #else
  	error_code = MPIR_Err_setmsg(MPI_ERR_UNSUPPORTED_OPERATION, 
                          MPIR_ERR_AMODE_SEQ, myname, (char *) 0, (char *) 0);
  	return ADIOI_Error(fh, error_code, myname);
  #endif
      }
  
      if (fh->split_coll_count) {
  #ifdef PRINT_ERR_MSG
          FPRINTF(stderr, "MPI_File_read_at_all_begin: Only one active split collective I/O operation allowed per file handle\n");
          MPI_Abort(MPI_COMM_WORLD, 1);
  #else
  	error_code = MPIR_Err_setmsg(MPI_ERR_IO, MPIR_ERR_MULTIPLE_SPLIT_COLL,
                                myname, (char *) 0, (char *) 0);
  	return ADIOI_Error(fh, error_code, myname);
  #endif
      }
  
      fh->split_coll_count = 1;
  
      MPI_Type_size(datatype, &datatype_size);
      if ((count*datatype_size) % fh->etype_size != 0) {
  #ifdef PRINT_ERR_MSG
          FPRINTF(stderr, "MPI_File_read_at_all_begin: Only an integral number of etypes can be accessed\n");
          MPI_Abort(MPI_COMM_WORLD, 1);
  #else
  	error_code = MPIR_Err_setmsg(MPI_ERR_IO, MPIR_ERR_ETYPE_FRACTIONAL,
  				     myname, (char *) 0, (char *) 0);
  	return ADIOI_Error(fh, error_code, myname);	    
  #endif
      }
  
      ADIO_ReadStridedColl(fh, buf, count, datatype, ADIO_EXPLICIT_OFFSET,
  			  offset, &status, &error_code);
      return error_code;
  }
  