text: /*
   * Copyright (C) by Argonne National Laboratory
   *     See COPYRIGHT in top-level directory
   */
  
  #include "adio.h"
  
  #ifdef HAVE_UNISTD_H
  #include <unistd.h>
  #endif
  #ifdef HAVE_SIGNAL_H
  #include <signal.h>
  #endif
  #ifdef HAVE_SYS_TYPES_H
  #include <sys/types.h>
  #endif
  #ifdef HAVE_AIO_H
  #include <aio.h>
  #endif
  #ifdef HAVE_SYS_AIO_H
  #include <sys/aio.h>
  #endif
  
  #include "mpiu_greq.h"
  
  #ifdef ROMIO_HAVE_WORKING_AIO
  /* ADIOI_GEN_IreadContig
   *
   * This code handles two distinct cases.  If ROMIO_HAVE_WORKING_AIO is not
   * defined, then I/O is performed in a blocking manner.  Otherwise we post
   * an asynchronous I/O operation using the appropriate aio routines.
   *
   * In the aio case we rely on ADIOI_GEN_aio(), which is implemented in
   * common/ad_iwrite.c.
   */
  void ADIOI_GEN_IreadContig(ADIO_File fd, void *buf, int count,
                             MPI_Datatype datatype, int file_ptr_type,
                             ADIO_Offset offset, MPI_Request * request, int *error_code)
  {
      MPI_Count len, typesize;
      int aio_errno = 0;
      static char myname[] = "ADIOI_GEN_IREADCONTIG";
  
      MPI_Type_size_x(datatype, &typesize);
      len = count * typesize;
  
      if (file_ptr_type == ADIO_INDIVIDUAL)
          offset = fd->fp_ind;
      aio_errno = ADIOI_GEN_aio(fd, buf, count, datatype, offset, 0, request);
      if (file_ptr_type == ADIO_INDIVIDUAL)
          fd->fp_ind += len;
  
      fd->fp_sys_posn = -1;
  
      /* --BEGIN ERROR HANDLING-- */
      if (aio_errno != 0) {
          MPIO_ERR_CREATE_CODE_ERRNO(myname, aio_errno, error_code);
          return;
      }
      /* --END ERROR HANDLING-- */
  
      *error_code = MPI_SUCCESS;
  }
  #endif
  
  /* Generic implementation of IreadStrided calls the blocking ReadStrided
   * immediately.
   */
  void ADIOI_GEN_IreadStrided(ADIO_File fd, void *buf, int count,
                              MPI_Datatype datatype, int file_ptr_type,
                              ADIO_Offset offset, ADIO_Request * request, int *error_code)
  {
      ADIO_Status status;
      MPI_Count typesize;
      MPI_Offset nbytes = 0;
  
      /* Call the blocking function.  It will create an error code
       * if necessary.
       */
      ADIO_ReadStrided(fd, buf, count, datatype, file_ptr_type, offset, &status, error_code);
  
      if (*error_code == MPI_SUCCESS) {
          MPI_Type_size_x(datatype, &typesize);
          nbytes = (MPI_Offset) count *(MPI_Offset) typesize;
      }
      MPIO_Completed_request_create(&fd, nbytes, error_code, request);
  }
  