Manual Pages for UNIX Darwin command on man MPI_File_set_atomicity
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Manual Pages for UNIX Darwin command on man MPI_File_set_atomicity

MPIFilesetatomicity(3OpenMPI) MPIFilesetatomicity(3OpenMPI)

NAME

MMPPIIFFiilleesseettaattoommiicciittyy - Sets consistency semantics for data-access

operations (collective). SSYYNNTTAAXX C Syntax

#include

int MPIFilesetatomicity(MPIFile fh, int flag) Fortran Syntax INCLUDE 'mpif.h'

MPIFILESETATOMICITY(FH, FLAG, IERROR)

INTEGER FH, FLAG, IERROR

CC++++ SSyynnttaaxx

#include

void MPI::File::Setatomicity(bool flag) IINNPPUUTT PPAARRAAMMEETTEERRSS fh File handle (handle). flag ttrruuee to enable atomic mode, ffaallssee to enable nonatomic mode (boolean). OOUUTTPPUUTT PPAARRAAMMEETTEERR

IERROR Fortran only: Error status (integer).

DESCRIPTION

The consistency semantics for data-access operations using the set of

file handles created by one collective MPIFileopen is set by collec-

tively calling MPIFilesetatomicity. All processes in the group must pass identical values for fh and flag. If flag is true, atomic mode is set; if flag is false, nonatomic mode is set. The default value on a call to MPIFileopen in Open MPI is true for jobs running on more than one node, false for jobs running on a single

SMP. For more information, see the MPI-2 standard.

EERRRROORRSS Almost all MPI routines return an error value; C routines as the value

of the function and Fortran routines in the last argument. C++ func-

tions do not return errors. If the default error handler is set to

MPI::ERRORSTHROWEXCEPTIONS, 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 MPIERRORSRETURN. The error handler may be changed with

MPIFileseterrhandler; the predefined error handler

MPIERRORSAREFATAL may be used to make I/O errors fatal. Note that

MPI does not guarantee that an MPI program can continue past an error. Open MPI 1.2 September 2006MPIFilesetatomicity(3OpenMPI)




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