|
Packit Service |
c5cf8c |
|
|
Packit Service |
c5cf8c |
<HTML>
|
|
Packit Service |
c5cf8c |
<HEAD>
|
|
Packit Service |
c5cf8c |
<META NAME="GENERATOR" CONTENT="DOCTEXT">
|
|
Packit Service |
c5cf8c |
<TITLE>MPI_Get_address</TITLE>
|
|
Packit Service |
c5cf8c |
</HEAD>
|
|
Packit Service |
c5cf8c |
<BODY BGCOLOR="FFFFFF">
|
|
Packit Service |
c5cf8c |
MPI_Get_address
|
|
Packit Service |
c5cf8c |
Get the address of a location in memory
|
|
Packit Service |
c5cf8c |
Synopsis
|
|
Packit Service |
c5cf8c |
|
|
Packit Service |
c5cf8c |
int MPI_Get_address(const void *location, MPI_Aint * address)
|
|
Packit Service |
c5cf8c |
|
|
Packit Service |
c5cf8c |
Input Parameters
|
|
Packit Service |
c5cf8c |
|
|
Packit Service |
c5cf8c |
location location in caller memory (choice)
|
|
Packit Service |
c5cf8c |
|
|
Packit Service |
c5cf8c |
|
|
Packit Service |
c5cf8c |
Output Parameters
|
|
Packit Service |
c5cf8c |
|
|
Packit Service |
c5cf8c |
address address of location (address integer)
|
|
Packit Service |
c5cf8c |
|
|
Packit Service |
c5cf8c |
|
|
Packit Service |
c5cf8c |
Notes
|
|
Packit Service |
c5cf8c |
This routine is provided for both the Fortran and C programmers.
|
|
Packit Service |
c5cf8c |
On many systems, the address returned by this routine will be the same
|
|
Packit Service |
c5cf8c |
as produced by the C <tt>&</tt> operator, but this is not required in C and
|
|
Packit Service |
c5cf8c |
may not be true of systems with word- rather than byte-oriented
|
|
Packit Service |
c5cf8c |
instructions or systems with segmented address spaces.
|
|
Packit Service |
c5cf8c |
|
|
Packit Service |
c5cf8c |
This routine should be used instead of <tt>MPI_Address</tt>.
|
|
Packit Service |
c5cf8c |
|
|
Packit Service |
c5cf8c |
Thread and Interrupt Safety
|
|
Packit Service |
c5cf8c |
|
|
Packit Service |
c5cf8c |
This routine is both thread- and interrupt-safe.
|
|
Packit Service |
c5cf8c |
This means that this routine may safely be used by multiple threads and
|
|
Packit Service |
c5cf8c |
from within a signal handler.
|
|
Packit Service |
c5cf8c |
|
|
Packit Service |
c5cf8c |
Notes for Fortran
|
|
Packit Service |
c5cf8c |
All MPI routines in Fortran (except for <tt>MPI_WTIME</tt> and <tt>MPI_WTICK</tt>) have
|
|
Packit Service |
c5cf8c |
an additional argument <tt>ierr</tt> at the end of the argument list. <tt>ierr
|
|
Packit Service |
c5cf8c |
</tt>is an integer and has the same meaning as the return value of the routine
|
|
Packit Service |
c5cf8c |
in C. In Fortran, MPI routines are subroutines, and are invoked with the
|
|
Packit Service |
c5cf8c |
<tt>call</tt> statement.
|
|
Packit Service |
c5cf8c |
|
|
Packit Service |
c5cf8c |
All MPI objects (e.g., <tt>MPI_Datatype</tt>, <tt>MPI_Comm</tt>) are of type <tt>INTEGER
|
|
Packit Service |
c5cf8c |
</tt>in Fortran.
|
|
Packit Service |
c5cf8c |
|
|
Packit Service |
c5cf8c |
In Fortran, the integer type is always signed. This can cause problems
|
|
Packit Service |
c5cf8c |
on systems where the address fits into a four byte unsigned integer but
|
|
Packit Service |
c5cf8c |
the value is larger than the largest signed integer. For example, a system
|
|
Packit Service |
c5cf8c |
with more than 2 GBytes of memory may have addresses that do not fit within
|
|
Packit Service |
c5cf8c |
a four byte signed integer. Unfortunately, there is no easy solution to
|
|
Packit Service |
c5cf8c |
this problem, as there is no Fortran datatype that can be used here (using
|
|
Packit Service |
c5cf8c |
a longer integer type will cause other problems, as well as surprising
|
|
Packit Service |
c5cf8c |
users when the size of the integer type is larger that the size of a pointer
|
|
Packit Service |
c5cf8c |
in C). In this case, it is recommended that you use C to manipulate
|
|
Packit Service |
c5cf8c |
addresses.
|
|
Packit Service |
c5cf8c |
|
|
Packit Service |
c5cf8c |
Errors
|
|
Packit Service |
c5cf8c |
|
|
Packit Service |
c5cf8c |
All MPI routines (except <tt>MPI_Wtime</tt> and <tt>MPI_Wtick</tt>) return an error value;
|
|
Packit Service |
c5cf8c |
C routines as the value of the function and Fortran routines in the last
|
|
Packit Service |
c5cf8c |
argument. Before the value is returned, the current MPI error handler is
|
|
Packit Service |
c5cf8c |
called. By default, this error handler aborts the MPI job. The error handler
|
|
Packit Service |
c5cf8c |
may be changed with <tt>MPI_Comm_set_errhandler</tt> (for communicators),
|
|
Packit Service |
c5cf8c |
<tt>MPI_File_set_errhandler</tt> (for files), and <tt>MPI_Win_set_errhandler</tt> (for
|
|
Packit Service |
c5cf8c |
RMA windows). The MPI-1 routine <tt>MPI_Errhandler_set</tt> may be used but
|
|
Packit Service |
c5cf8c |
its use is deprecated. The predefined error handler
|
|
Packit Service |
c5cf8c |
<tt>MPI_ERRORS_RETURN</tt> may be used to cause error values to be returned.
|
|
Packit Service |
c5cf8c |
Note that MPI does not guarentee that an MPI program can continue past
|
|
Packit Service |
c5cf8c |
an error; however, MPI implementations will attempt to continue whenever
|
|
Packit Service |
c5cf8c |
possible.
|
|
Packit Service |
c5cf8c |
|
|
Packit Service |
c5cf8c |
|
|
Packit Service |
c5cf8c |
MPI_SUCCESS No error; MPI routine completed successfully.
|
|
Packit Service |
c5cf8c |
|
|
Packit Service |
c5cf8c |
|
|
Packit Service |
c5cf8c |
MPI_ERR_OTHER Other error; use <tt>MPI_Error_string</tt> to get more information
|
|
Packit Service |
c5cf8c |
about this error code.
|
|
Packit Service |
c5cf8c |
|
|
Packit Service |
c5cf8c |
</BODY></HTML>
|