/*D
   MPI_T_pvar_reset - Reset a performance variable

Synopsis:
.vb
int MPI_T_pvar_reset(MPI_T_pvar_session session, MPI_T_pvar_handle handle)
.ve

Input Parameters:
+ session - identifier of performance experiment session (handle)
- handle - handle of a performance variable (handle)

Notes:
The MPI_T_pvar_reset() call sets the performance variable with the handle identified
by the parameter handle to its starting value. If it is not possible
to change the variable, the function returns MPI_T_ERR_PVAR_NO_WRITE.
If the constant MPI_T_PVAR_ALL_HANDLES is passed in handle, the MPI implementation
attempts to reset all variables within the session identified by the parameter session for
which handles have been allocated. In this case, the routine returns MPI_SUCCESS if all
variables are reset successfully, otherwise MPI_T_ERR_PVAR_NO_WRITE is returned. Readonly
variables are ignored when MPI_T_PVAR_ALL_HANDLES is specified.

.N ThreadSafe

.N Errors
.N MPI_SUCCESS
.N MPI_T_ERR_INVALID_HANDLE
.N MPI_T_ERR_INVALID_SESSION
.N MPI_T_ERR_NOT_INITIALIZED
.N MPI_T_ERR_PVAR_NO_WRITE
.N MPI_ERR_OTHER

D*/

