# MPI_T_finalize

Finalize the MPI tool information interface

## Synopsis

    int MPI_T_finalize(void)

## Notes

This routine may be called as often as the corresponding MPI_T_init_thread() routine up to the current point of execution. Calling it more times returns a corresponding error code. As long as the number of calls to MPI_T_finalize() is smaller than the number of calls to MPI_T_init_thread() up to the current point of execution, the MPI tool information interface remains initialized and calls to its routines are permissible. Further, additional calls to MPI_T_init_thread() after one or more calls to MPI_T_finalize() are permissible. Once MPI_T_finalize() is called the same number of times as the routine MPI_T_init_thread() up to the current point of execution, the MPI tool information interface is no longer initialized. The interface can be reinitialized by subsequent calls to MPI_T_init_thread().

At the end of the program execution, unless MPI_Abort() is called, an application must have called MPI_T_init_thread() and MPI_T_finalize() an equal number of times.

## 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 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.

MPI_SUCCESS
  No error; MPI routine completed successfully.

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.

## See Also

MPI_T_init_thread