[97] | 1 | .\"Copyright 2006-2008 Sun Microsystems, Inc. |
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| 2 | .\" Copyright (c) 1996 Thinking Machines Corporation |
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| 3 | .TH MPI_Type_get_true_extent 3 "Dec 08, 2009" "1.4" "Open MPI" |
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| 4 | .SH NAME |
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| 5 | \fBMPI_Type_get_true_extent\fP \- Returns the true lower bound and extent of a data type's corresponding typemap, ignoring MPI_UB and MPI_LB markers. |
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| 6 | |
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| 7 | .SH SYNTAX |
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| 8 | .ft R |
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| 9 | .SH C Syntax |
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| 10 | .nf |
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| 11 | #include <mpi.h> |
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| 12 | int MPI_Type_get_true_extent(MPI_Datatype \fIdatatype\fP, |
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| 13 | MPI_Aint *\fItrue_lb\fP, MPI_Aint *\fItrue_extent\fP) |
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| 14 | |
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| 15 | .SH Fortran Syntax (see FORTRAN 77 NOTES) |
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| 16 | .nf |
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| 17 | INCLUDE 'mpif.h' |
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| 18 | MPI_TYPE_GET_TRUE_EXTENT(\fIDATATYPE, TRUE_LB, TRUE_EXTENT, IERROR\fP) |
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| 19 | INTEGER \fIDATATYPE, IERROR\fP |
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| 20 | INTEGER(KIND=MPI_ADDRESS_KIND) \fITRUE_LB, TRUE_EXTENT\fP |
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| 21 | |
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| 22 | .SH C++ Syntax |
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| 23 | .nf |
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| 24 | #include <mpi.h> |
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| 25 | void MPI::Datatype::Get_true_extent(MPI::Aint& \fItrue_lb\fP, |
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| 26 | MPI::Aint& \fItrue_extent\fP) const |
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| 27 | |
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| 28 | .SH INPUT PARAMETER |
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| 29 | .ft R |
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| 30 | .TP 1i |
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| 31 | datatype |
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| 32 | Data type for which information is wanted (handle). |
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| 33 | .sp |
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| 34 | .SH OUTPUT PARAMETERS |
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| 35 | .ft R |
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| 36 | .TP 1i |
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| 37 | true_lb |
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| 38 | True lower bound of data type (integer). |
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| 39 | .TP 1i |
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| 40 | true_extent |
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| 41 | True size of data type (integer). |
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| 42 | .ft R |
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| 43 | .TP 1i |
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| 44 | IERROR |
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| 45 | Fortran only: Error status (integer). |
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| 46 | |
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| 47 | .SH DESCRIPTION |
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| 48 | .ft R |
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| 49 | The \fItrue_lb\fP parameter returns the offset of the lowest unit of store that is addressed by the data type, that is, the lower bound of the corresponding typemap, ignoring MPI_LB markers. The \fItrue_extent\fP parameter returns the true size of the data type, that is, the extent of the corresponding typemap, ignoring MPI_LB and MPI_UB markers, and performing no rounding for alignment. |
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| 50 | .sp |
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| 51 | The \fItrue_extent\fP is the minimum number of bytes of memory necessary to hold a data type, uncompressed. |
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| 52 | .sp |
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| 53 | See Section 4.14.3 of the MPI-2 standard for more detailed definitions of these parameters in relation to the typemap. |
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| 54 | |
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| 55 | .SH FORTRAN 77 NOTES |
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| 56 | .ft R |
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| 57 | The MPI standard prescribes portable Fortran syntax for |
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| 58 | the \fITRUE_LB\fP and \fITRUE_EXTENT\fP arguments only for Fortran 90. FORTRAN 77 |
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| 59 | users may use the non-portable syntax |
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| 60 | .sp |
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| 61 | .nf |
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| 62 | INTEGER*MPI_ADDRESS_KIND \fITRUE_LB\fP |
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| 63 | or |
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| 64 | INTEGER*MPI_ADDRESS_KIND \fITRUE_EXTENT\fP |
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| 65 | .fi |
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| 66 | .sp |
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| 67 | where MPI_ADDRESS_KIND is a constant defined in mpif.h |
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| 68 | and gives the length of the declared integer in bytes. |
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| 69 | |
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| 70 | .SH ERRORS |
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| 71 | Almost all MPI routines return an error value; C routines as the value of the function and Fortran routines in the last argument. C++ functions do not return errors. If the default error handler is set to MPI::ERRORS_THROW_EXCEPTIONS, then on error the C++ exception mechanism will be used to throw an MPI:Exception object. |
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| 72 | .sp |
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| 73 | Before the error value is returned, the current MPI error handler is |
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| 74 | called. By default, this error handler aborts the MPI job, except for I/O function errors. The error handler may be changed with MPI_Comm_set_errhandler; the predefined error handler MPI_ERRORS_RETURN may be used to cause error values to be returned. Note that MPI does not guarantee that an MPI program can continue past an error. |
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| 75 | |
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| 76 | |
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