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.. _mpi_t_pvar_readreset:
MPI_T_pvar_readreset
====================
.. include_body
:ref:`MPI_T_pvar_readreset` |mdash| Atomically read and reset the value of a
performance variable
SYNTAX
------
C Syntax
^^^^^^^^
.. code-block:: c
#include <mpi.h>
int MPI_T_pvar_readreset(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_readreset` atomically queries and resets the value of a
performance variable bound to the handle specified by *handle* in the
session specified by *session*. The result is stored in the buffer
pointed to by *buf*. This function can only be used with performance
variables that are atomic and not readonly. 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_readreset` 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
* ``MPI_T_ERR_PVAR_NO_ATOMIC``: Variable cannot be read and written atomically
* ``MPI_T_ERR_PVAR_NO_WRITE``: Variable cannot be reset
.. seealso::
* :ref:`MPI_T_pvar_handle_alloc`
* :ref:`MPI_T_pvar_get_info`
* :ref:`MPI_T_pvar_session_create`
* :ref:`MPI_T_pvar_read`
* :ref:`MPI_T_pvar_reset`
|
