PetscCallMPI

Checks error code returned from MPI calls, if non-zero it calls the error handler and then returns

Synopsis

#include <petscerror.h>
void PetscCallMPI(MPI_Function(args))

Not Collective

Input Parameter

• MPI_Function - an MPI function that returns an MPI error code

Notes

Always returns the error code PETSC_ERR_MPI; the MPI error code and string are embedded in the string error message. Do not use this to call any other routines (for example PETSc routines), it should only be used for direct MPI calls. The user may configure PETSc with the --with-strict-petscerrorcode option to check this at compile-time, otherwise they must check this themselves.

This routine can only be used in functions returning PetscErrorCode themselves. If the calling function returns a different type, use PetscCallMPIAbort() instead.

Example Usage

  PetscCallMPI(MPI_Comm_size(...)); // OK, calling MPI function

  PetscCallMPI(PetscFunction(...)); // ERROR, use PetscCall() instead!

Fortran Notes

The Fortran function from which this is used must declare a variable PetscErrorCode ierr and ierr must be the final argument to the MPI function being called.

In the main program and in Fortran subroutines that do not have ierr as the final return parameter one should use PetscCallMPIA()

Fortran Usage

  PetscErrorCode ierr or integer ierr
  ...
  PetscCallMPI(MPI_Comm_size(...,ierr))
  PetscCallMPIA(MPI_Comm_size(...,ierr)) ! Will abort after calling error handler

  PetscCallMPI(MPI_Comm_size(...,eflag)) ! ERROR, final argument must be ierr

See Also

SETERRMPI(), PetscCall(), SETERRQ(), SETERRABORT(), PetscCallAbort(), PetscCallMPIAbort(), PetscTraceBackErrorHandler(), PetscPushErrorHandler(), PetscError(), CHKMEMQ

Level

beginner

Location

include/petscerror.h

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