# 18.2.367. MPI_T_pvar_reset

MPI_T_pvar_reset — Reset the value of a performance variable

## 18.2.367.1. SYNTAX

### 18.2.367.1.1. C Syntax

    #include <mpi.h>

    int MPI_T_pvar_reset(MPI_T_pvar_session session, MPI_T_pvar_handle handle)

## 18.2.367.2. INPUT PARAMETERS

- `session`: Performance experiment session.

- `handle`: Performance variable handle or MPI_T_PVAR_ALL_HANDLES.

## 18.2.367.3. DESCRIPTION

MPI_T_pvar_reset sets the performance variable specified by the handle in handle to its initial value. The special value MPI_T_PVAR_ALL_HANDLES can be passed in handle to reset all read-write handles in the session specified in session.

## 18.2.367.4. ERRORS

MPI_T_pvar_reset will fail if:

- `MPI_T_ERR_NOT_INITIALIZED`: The MPI Tools interface not initialized

- `MPI_T_ERR_INVALID_HANDLE`: The handle is invalid

- `MPI_T_ERR_INVALID_SESSION`: Session argument is not a valid session

- `MPI_T_ERR_PVAR_NO_WRITE`: Variable cannot be reset

See also

- MPI_T_pvar_handle_alloc

- MPI_T_pvar_get_info

- MPI_T_pvar_session_create

- MPI_T_pvar_write