MPIX_Op_create_x(3) MPI MPIX_Op_create_x(3) NAME MPIX_Op_create_x - Creates a user-defined reduction op with an extra_state SYNOPSIS int MPIX_Op_create_x(MPIX_User_function_x *user_fn_x, MPIX_Destructor_function *destructor_fn, int commute, void *extra_state, MPI_Op *op) INPUT PARAMETERS user_fn_x - user defined function with extra_state (function) destructor_fn - callback when op is freed (function) commute - true if commutative; false otherwise. (logical) extra_state - extra state (None) OUTPUT PARAMETERS op - operation (handle) NOTES ON MPIX_USER_FUNCTION_X The calling list for the user function type is typedef void (MPIX_User_function_x) (void * a, void * b, MPI_Count len, MPI_Datatype datatype, void *extra_state); There are a few differences from MPI_User_function used in MPI_Op_create. 1. It passes len and datatype as scalar input, rather than as addresses. 2. The len is of MPI_Count, rather than int. 3. It accepts a void *ex- tra_state which is passed from users during MPIX_Op_create_x. 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 inte- ger 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 state- ment. 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 ar- gument. Before the value is returned, the current MPI error handler is called. By default, this error handler aborts the MPI job. The error han- dler may be changed with MPI_Comm_set_errhandler (for communicators), MPI_File_set_errhandler (for files), and MPI_Win_set_errhandler (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 guarantee that an MPI program can continue past an error; however, MPI implementations will attempt to continue whenever possible. MPI_SUCCESS - No error; MPI routine completed successfully. MPI_ERR_ARG - Invalid argument. Some argument is invalid and is not identified by a specific error class (e.g., MPI_ERR_RANK ). MPI_ERR_OTHER - Other error; use MPI_Error_string to get more information about this error code. 4/10/2026 MPIX_Op_create_x(3)
NAME | SYNOPSIS | INPUT PARAMETERS | OUTPUT PARAMETERS | NOTES ON MPIX_USER_FUNCTION_X | THREAD AND INTERRUPT SAFETY | NOTES FOR FORTRAN | ERRORS
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