NAME¶
MPI_T_pvar_readreset - Read the value of a performance variable and then reset
it
SYNOPSIS¶
int MPI_T_pvar_readreset(MPI_T_pvar_session session, MPI_T_pvar_handle handle, void *buf)
- session
- - identifier of performance experiment session (handle)
- handle
- - handle of a performance variable (handle)
OUTPUT PARAMETERS¶
- buf
- - initial address of storage location for variable value (choice)
THREAD AND INTERRUPT SAFETY¶
This routine is thread-safe. This means that this routine may be safely used by
multiple threads without the need for any user-provided thread locks. However,
the routine is not interrupt safe. Typically, this is due to the use of memory
allocation routines such as
malloc or other non-MPICH runtime routines
that are themselves not interrupt-safe.
ERRORS¶
All MPI routines (except
MPI_Wtime and
MPI_Wtick ) return an error
value; C routines as the value of the function and Fortran routines in the
last argument. Before the value is returned, the current MPI error handler is
called. By default, this error handler aborts the MPI job. The error handler
may be changed with
MPI_Comm_set_errhandler (for communicators),
MPI_File_set_errhandler (for files), and
MPI_Win_set_errhandler
(for RMA windows). The MPI-1 routine
MPI_Errhandler_set may be used but
its use is deprecated. The predefined error handler
MPI_ERRORS_RETURN
may be used to cause error values to be returned. Note that MPI does
not guarentee that an MPI program can continue past an error; however,
MPI implementations will attempt to continue whenever possible.
- MPI_SUCCESS
- - No error; MPI routine completed successfully.
- MPI_T_ERR_NOT_INITIALIZED
- - The MPI tool information interface is not initialized.
- MPI_T_ERR_INVALID_SESSION
- - Session argument is not valid.
- MPI_T_ERR_INVALID_HANDLE
- - The handle is invalid.
- MPI_T_ERR_PVAR_NO_WRITE
- - The performance variable can not be written or reset.
- MPI_T_ERR_PVAR_NO_ATOMIC
- - The performance variable can not be read/write atomically.
LOCATION¶
/tmp/gyCYfBi4J6/mpich-3.1/src/mpi_t/pvar_readreset.c