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.TH MPI_T_pvar_write 3 "11/12/2019" " " "MPI"
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.SH NAME
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MPI_T_pvar_write \- Write a performance variable
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.SH SYNOPSIS
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.nf
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int MPI_T_pvar_write(MPI_T_pvar_session session, MPI_T_pvar_handle handle, const void *buf)
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.fi
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.SH INPUT PARAMETERS
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.PD 0
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.TP
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.B session
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- identifier of performance experiment session (handle)
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.PD 1
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.PD 0
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.TP
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.B handle
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- handle of a performance variable (handle)
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.PD 1
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.PD 0
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.TP
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.B buf
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- initial address of storage location for variable value (choice)
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.PD 1
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.SH NOTES
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The MPI_T_pvar_write() call attempts to write the value of the performance variable
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with the handle identified by the parameter handle in the session identified by the parameter
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session. The value to be written is passed in the buffer identified by the parameter buf. The
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user must ensure that the buffer is of the appropriate size to hold the entire value of the
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performance variable (based on the datatype and count returned by the corresponding previous
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calls to MPI_T_pvar_get_info() and MPI_T_pvar_handle_alloc(), respectively).
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The constant MPI_T_PVAR_ALL_HANDLES cannot be used as an argument for the function
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MPI_T_pvar_write().
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.SH THREAD AND INTERRUPT SAFETY
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This routine is thread-safe. This means that this routine may be
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safely used by multiple threads without the need for any user-provided
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thread locks. However, the routine is not interrupt safe. Typically,
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this is due to the use of memory allocation routines such as
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.I malloc
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or other non-MPICH runtime routines that are themselves not interrupt-safe.
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.SH ERRORS
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All MPI routines (except
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.I MPI_Wtime
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and
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.I MPI_Wtick
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) return an error value;
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C routines as the value of the function and Fortran routines in the last
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argument. Before the value is returned, the current MPI error handler is
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called. By default, this error handler aborts the MPI job. The error handler
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may be changed with
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.I MPI_Comm_set_errhandler
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(for communicators),
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.I MPI_File_set_errhandler
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(for files), and
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.I MPI_Win_set_errhandler
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(for
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RMA windows). The MPI-1 routine
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.I MPI_Errhandler_set
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may be used but
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its use is deprecated. The predefined error handler
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.I MPI_ERRORS_RETURN
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may be used to cause error values to be returned.
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Note that MPI does
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.B not
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guarentee that an MPI program can continue past
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an error; however, MPI implementations will attempt to continue whenever
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possible.
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.PD 0
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.TP
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.B MPI_SUCCESS
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- No error; MPI routine completed successfully.
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.PD 1
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.PD 0
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.TP
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.B MPI_T_ERR_NOT_INITIALIZED
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- The MPI tool information interface is not initialized.
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.PD 1
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.PD 0
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.TP
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.B MPI_T_ERR_INVALID_SESSION
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- Session argument is not valid.
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.PD 1
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.PD 0
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.TP
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.B MPI_T_ERR_INVALID_HANDLE
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- The handle is invalid.
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.PD 1
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.PD 0
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.TP
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.B MPI_T_ERR_PVAR_NO_WRITE
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- The performance variable can not be written or reset.
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.PD 1
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