PetscCommGetNewTag

Gets a unique new tag from a PETSc communicator

Synopsis

#include "petscsys.h"   
PetscErrorCode PetscCommGetNewTag(MPI_Comm comm, PetscMPIInt *tag)

Collective

Input Parameter

• comm - the MPI communicator

Output Parameter

• tag - the new tag

Notes

All processors that share the communicator MUST call this routine EXACTLY the same number of times. This tag should only be used with the current objects communicator; do NOT use it with any other MPI communicator.

See Also

PetscObjectGetNewTag(), PetscCommDuplicate()

Level

developer

Location

src/sys/objects/tagm.c

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