NAME¶

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

SYNTAX¶

C Syntax
    #include <mpi.h>
    int MPI_File_get_atomicity(MPI_File  fh, int *flag)

Fortran Syntax¶

    INCLUDE 'mpif.h'
    MPI_FILE_GET_ATOMICITY( FH, FLAG, IERROR)
	INTEGER FH, IERROR 
	LOGICAL FLAG

C++ Syntax¶

#include <mpi.h>
bool MPI::File::Get_atomicity() const

INPUT PARAMETER¶

fh

File handle (handle).

 

OUTPUT PARAMETER¶

flag

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

IERROR

Fortran only: Error status (integer).

 

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.

ERRORS¶

Almost all MPI routines return an error value; C routines as the value of the function and Fortran routines in the last argument. C++ functions do not return errors. If the default error handler is set to MPI::ERRORS_THROW_EXCEPTIONS, then on error the C++ exception mechanism will be used to throw an MPI:Exception object. 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.