17.2.104. MPI_File_get_atomicity

MPI_File_get_atomicity - Returns current consistency semantics for data-access operations.

17.2.104.1. SYNTAX

17.2.104.1.1. C Syntax

#include <mpi.h>

int MPI_File_get_atomicity(MPI_File fh, int *flag)

17.2.104.1.2. Fortran Syntax

USE MPI
! or the older form: INCLUDE 'mpif.h'
MPI_FILE_GET_ATOMICITY(FH, FLAG, IERROR)
     INTEGER FH, IERROR
     LOGICAL FLAG

17.2.104.1.3. Fortran 2008 Syntax

USE mpi_f08
MPI_File_get_atomicity(fh, flag, ierror)
     TYPE(MPI_File), INTENT(IN) :: fh
     LOGICAL, INTENT(OUT) :: flag
     INTEGER, OPTIONAL, INTENT(OUT) :: ierror

17.2.104.2. INPUT PARAMETER

  • fh: File handle (handle).

17.2.104.3. OUTPUT PARAMETER

  • flag: true if atomic mode is enabled, false if nonatomic mode is enabled (boolean).

  • IERROR: Fortran only: Error status (integer).

17.2.104.4. DESCRIPTION

MPI_File_get_atomicity returns the current consistency semantics for data access operations on the set of file handles created by one collective MPI_File_open. If flag is true, atomic mode is currently enabled; if flag is false, nonatomic mode is currently enabled.

17.2.104.5. ERRORS

Almost all MPI routines return an error value; C routines as the value of the function and Fortran routines in the last argument.

Before the error value is returned, the current MPI error handler is called. For MPI I/O function errors, the default error handler is set to MPI_ERRORS_RETURN. The error handler may be changed with MPI_File_set_errhandler; the predefined error handler MPI_ERRORS_ARE_FATAL may be used to make I/O errors fatal. Note that MPI does not guarantee that an MPI program can continue past an error.