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MPI_Group_intersection(3) MPI MPI_Group_intersection(3) NAME MPI_Group_intersection - Produces a group as the intersection of two existing groups SYNOPSIS int MPI_Group_intersection(MPI_Group group1, MPI_Group group2, MPI_Group *newgroup) INPUT PARAMETERS group1 - first group (handle) group2 - second group (handle) OUTPUT PARAMETER newgroup - intersection group (handle) NOTES The output group contains those processes that are in both group1 and group2 . THREAD AND INTERRUPT SAFETY This routine is thread-safe. This means that this routine may be safely used by multiple threads without the need for any user-provided thread locks. However, the routine is not interrupt safe. Typically, this is due to the use of memory allocation routines such as malloc or other non-MPICH runtime routines that are themselves not interrupt- safe. NOTES FOR FORTRAN All MPI routines in Fortran (except for MPI_WTIME and MPI_WTICK ) have an additional argument ierr at the end of the argument list. ierr is an integer and has the same meaning as the return value of the routine in C. In Fortran, MPI routines are subroutines, and are invoked with the call statement. All MPI objects (e.g., MPI_Datatype , MPI_Comm ) are of type INTEGER in Fortran. ERRORS All MPI routines (except MPI_Wtime and MPI_Wtick ) return an error value; C routines as the value of the function and Fortran routines in the last argument. Before the value is returned, the current MPI error handler is called. By default, this error handler aborts the MPI job. The error handler may be changed with MPI_Comm_set_errhandler (for com- municators), MPI_File_set_errhandler (for files), and MPI_Win_set_er- rhandler (for RMA windows). The MPI-1 routine MPI_Errhandler_set may be used but its use is deprecated. The predefined error handler MPI_ERRORS_RETURN may be used to cause error values to be returned. Note that MPI does not guarentee that an MPI program can continue past an error; however, MPI implementations will attempt to continue when- ever possible. MPI_SUCCESS - No error; MPI routine completed successfully. MPI_ERR_GROUP - Null or invalid group passed to function. MPI_ERR_INTERN - This error is returned when some part of the MPICH implementa- tion is unable to acquire memory. SEE ALSO MPI_Group_free LOCATION src/mpi/group/group_intersection.c 9/20/2012 MPI_Group_intersection(3)
NAME | SYNOPSIS | INPUT PARAMETERS | OUTPUT PARAMETER | NOTES | THREAD AND INTERRUPT SAFETY | NOTES FOR FORTRAN | ERRORS | SEE ALSO | LOCATION
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