MPI_T_category_changed(3) MPI MPI_T_category_changed(3) NAME MPI_T_category_changed - Get the timestamp indicating the last change to the categories SYNOPSIS int MPI_T_category_changed(int *update_number) OUTPUT PARAMETERS update_number - update number (integer) NOTES If two subsequent calls to this routine return the same timestamp, it is guaranteed that the category information has not changed between the two calls. If the timestamp retrieved from the second call is higher, then some categories have been added or expanded. 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. 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_T_ERR_INVALID - Invalid use of the interface or bad parameter values(s). MPI_T_ERR_NOT_INITIALIZED - The MPI tool information interface is not initialized. MPI_ERR_OTHER - Other error; use MPI_Error_string to get more information about this error code. 4/10/2026 MPI_T_category_changed(3)
NAME | SYNOPSIS | OUTPUT PARAMETERS | NOTES | THREAD AND INTERRUPT SAFETY | ERRORS
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