Returns a new info object containing the hints of the callback function registered for the callback safety level specified by cb_safety of the event-registration handle associated with event_registration.


int MPI_T_event_callback_get_info(MPI_T_event_registration event_registration,
                                  MPI_T_cb_safety cb_safety,
                                  MPI_Info *info_used)

Input Parameters

event registration (handle)
callback safety level (integer)

Output Parameters

info object (handle)

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.


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 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.

No error; MPI routine completed successfully.
Invalid use of the interface or bad parameter values(s).
The handle is invalid.
The MPI tool information interface is not initialized.
Other error; use MPI_Error_string to get more information about this error code.