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.. _mpi_t_pvar_read:
MPI_T_pvar_read
===============
.. include_body
:ref:`MPI_T_pvar_read` |mdash| Read the value of a performance variable
SYNTAX
------
C Syntax
^^^^^^^^
.. code-block:: c
#include <mpi.h>
int MPI_T_pvar_read(MPI_T_pvar_session session, MPI_T_pvar_handle handle, const void *buf)
INPUT PARAMETERS
----------------
* ``session``: Performance experiment session.
* ``handle``: Performance variable handle.
* ``buf``: Initial address of storage location for variable value.
DESCRIPTION
-----------
:ref:`MPI_T_pvar_read` queries the value of a performance variable identified
by the handle specified in *handle* in the session specified in
*session*. The result is stored in the buffer pointed to by *buf*. The
caller must ensure that the buffer pointed to by *buf* is large enough
to hold the entire value of the performance variable.
ERRORS
------
:ref:`MPI_T_pvar_read` will fail if:
* ``MPI_T_ERR_NOT_INITIALIZED``: The MPI Tools interface not initialized
* ``MPI_T_ERR_INVALID_HANDLE``: The handle is invalid or not associated with the session
* ``MPI_T_ERR_INVALID_SESSION``: Session argument is not a valid session
.. seealso::
* :ref:`MPI_T_pvar_handle_alloc`
* :ref:`MPI_T_pvar_get_info`
* :ref:`MPI_T_pvar_session_create`
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