NAME¶
MPI_T_pvar_readreset - Atomically read and reset the value of a
performance variable
C Syntax¶
#include <mpi.h>
int MPI_T_pvar_readreset(MPI_T_pvar_session session, MPI_T_pvar_handle handle, const void *buf)
- session
- Performance experiment session.
- handle
- Performance variable handle.
- buf
- Initial address of storage location for variable value.
DESCRIPTION¶
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¶
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
SEE ALSO¶
MPI_T_pvar_handle_alloc
MPI_T_pvar_get_info
MPI_T_pvar_session_create
MPI_T_pvar_read
MPI_T_pvar_reset