MPI_Attr_get(3) MPI MPI_Attr_get(3) NAME MPI_Attr_get - Retrieves attribute value by key SYNOPSIS int MPI_Attr_get(MPI_Comm comm, int keyval, void *attribute_val, int *flag) INPUT PARAMETERS comm - communicator to which attribute is attached (handle) keyval - key value (integer) OUTPUT PARAMETERS attribute_val - attribute value, unless flag = false (None) flag - true if an attribute value was extracted; false if no attribute is associated with the key (logical) DEPRECATED FUNCTION The current MPI standard defines this routine as deprecated. The routine may continue to be used, but new code should use the replacement routine. The replacement for this routine is MPI_Comm_get_attr . 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_ERR_ARG - Invalid argument. Some argument is invalid and is not identified by a specific error class (e.g., MPI_ERR_RANK ). MPI_ERR_COMM - Invalid communicator. A common error is to use a null communica- tor in a call (not even allowed in MPI_Comm_rank ). MPI_ERR_KEYVAL - Invalid keyval MPI_ERR_OTHER - Other error; use MPI_Error_string to get more information about this error code. SEE ALSO MPI_Attr_put, MPI_Keyval_create, MPI_Attr_delete, MPI_Comm_get_attr 4/10/2026 MPI_Attr_get(3)
NAME | SYNOPSIS | INPUT PARAMETERS | OUTPUT PARAMETERS | DEPRECATED FUNCTION | THREAD AND INTERRUPT SAFETY | ERRORS | SEE ALSO
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