[97] | 1 | .\"Copyright 2006-2008 Sun Microsystems, Inc. |
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| 2 | .\"Copyright (c) 1996 Thinking Machines |
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| 3 | .TH MPI_Comm_create_keyval 3 "Dec 08, 2009" "1.4" "Open MPI" |
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| 4 | .SH NAME |
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| 5 | \fBMPI_Comm_create_keyval\fP \- Generates a new attribute key. |
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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_Comm_create_keyval(MPI_Comm_copy_attr_function |
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| 13 | *\fIcomm_copy_attr_fn\fP, MPI_Comm_delete_attr_function |
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| 14 | *\fIcomm_delete_attr_fn\fP, int *\fIcomm_keyval\fP, |
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| 15 | void *\fIextra_state\fP) |
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| 16 | |
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| 17 | .SH Fortran Syntax (see FORTRAN 77 NOTES) |
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| 18 | .nf |
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| 19 | INCLUDE 'mpif.h' |
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| 20 | MPI_COMM_CREATE_KEYVAL(\fICOMM_COPY_ATTR_FN, COMM_DELETE_ATTR_FN, |
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| 21 | COMM_KEYVAL, EXTRA_STATE, IERROR\fP) |
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| 22 | |
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| 23 | EXTERNAL \fICOMM_COPY_ATTR_FN, COMM_DELETE_ATTR_FN\fP |
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| 24 | INTEGER \fICOMM_KEYVAL, IERROR \fP |
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| 25 | INTEGER(KIND=MPI_ADDRESS_KIND) \fIEXTRA_STATE\fP |
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| 26 | |
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| 27 | .SH C++ Syntax |
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| 28 | .nf |
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| 29 | #include <mpi.h> |
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| 30 | static in MPI::Comm::Create_keyval(MPI::Comm::Copy_attr_function* |
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| 31 | \fIcomm_copy_attr_fn\fP, |
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| 32 | MPI::Comm::Delete_attr_function* \fIcomm_delete_attr_fn\fP, |
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| 33 | void* \fIextra_state\fP) |
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| 34 | |
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| 35 | .SH INPUT PARAMETERS |
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| 36 | .ft R |
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| 37 | .TP 1i |
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| 38 | comm_copy_attr_fn |
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| 39 | Copy callback function for \fIcomm_keyval\fP (function). |
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| 40 | .TP 1i |
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| 41 | comm_delete_attr_fn |
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| 42 | Delete callback function for \fIcomm_keyval\fP (function). |
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| 43 | .TP 1i |
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| 44 | extra_state |
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| 45 | Extra state for callback functions. |
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| 46 | |
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| 47 | .SH OUTPUT PARAMETER |
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| 48 | .ft R |
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| 49 | .TP 1i |
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| 50 | comm_keyval |
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| 51 | Key value for future access (integer). |
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| 52 | .TP 1i |
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| 53 | IERROR |
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| 54 | Fortran only: Error status (integer). |
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| 55 | |
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| 56 | .SH DESCRIPTION |
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| 57 | .ft R |
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| 58 | This function replaces MPI_Keyval_create, the use of which is deprecated. The C binding is identical. The Fortran binding differs in that \fIextra_state\fP is an address-sized integer. Also, the copy and delete callback functions have Fortran bindings that are consistent with address-sized attributes. |
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| 59 | .sp |
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| 60 | The argument \fIcomm_copy_attr_fn\fP may be specified as MPI_COMM_NULL_COPY_FN or MPI_COMM_DUP_FN from C, C++, or Fortran. MPI_COMM_NULL_COPY_FN is a function that does nothing more than returning \fIflag\fP = 0 and MPI_SUCCESS. MPI_COMM_DUP_FN is a simple-minded copy function that sets \fIflag\fP = 1, returns the value of \fIattribute_val_in\fP in \fIattribute_val_out\fP, and returns MPI_SUCCESS. These replace the MPI-1 predefined callbacks MPI_NULL_COPY_FN and MPI_DUP_FN, the use of which is deprecated. |
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| 61 | .sp |
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| 62 | The C callback functions are: |
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| 63 | .sp |
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| 64 | .nf |
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| 65 | typedef int MPI_Comm_copy_attr_function(MPI_Comm \fIoldcomm\fP, int \fIcomm_keyval\fP, |
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| 66 | void *\fIextra_state\fP, void *\fIattribute_val_in\fP, |
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| 67 | void *\fIattribute_val_out\fP, int *\fIflag\fP); |
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| 68 | .fi |
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| 69 | and |
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| 70 | .nf |
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| 71 | typedef int MPI_Comm_delete_attr_function(MPI_Comm \fIcomm\fP, int \fIcomm_keyval\fP, |
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| 72 | void *\fIattribute_val\fP, void *\fIextra_state\fP); |
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| 73 | .fi |
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| 74 | .sp |
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| 75 | which are the same as the MPI-1.1 calls but with a new name. The old names are deprecated. |
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| 76 | .sp |
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| 77 | The Fortran callback functions are: |
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| 78 | .sp |
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| 79 | .nf |
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| 80 | SUBROUTINE COMM_COPY_ATTR_FN(\fIOLDCOMM, COMM_KEYVAL, EXTRA_STATE, |
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| 81 | ATTRIBUTE_VAL_IN, ATTRIBUTE_VAL_OUT, FLAG, IERROR\fP) |
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| 82 | INTEGER \fIOLDCOMM, COMM_KEYVAL, IERROR\fP |
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| 83 | INTEGER(KIND=MPI_ADDRESS_KIND) \fIEXTRA_STATE, ATTRIBUTE_VAL_IN, |
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| 84 | ATTRIBUTE_VAL_OUT\fP |
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| 85 | LOGICAL \fIFLAG\fP |
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| 86 | .fi |
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| 87 | and |
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| 88 | .nf |
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| 89 | SUBROUTINE COMM_DELETE_ATTR_FN(\fICOMM, COMM_KEYVAL, ATTRIBUTE_VAL, EXTRA_STATE, |
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| 90 | IERROR\fP) |
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| 91 | INTEGER \fICOMM, COMM_KEYVAL, IERROR\fP |
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| 92 | INTEGER(KIND=MPI_ADDRESS_KIND) \fIATTRIBUTE_VAL, EXTRA_STATE\fP |
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| 93 | .fi |
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| 94 | .sp |
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| 95 | The C++ callbacks are: |
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| 96 | .sp |
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| 97 | .nf |
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| 98 | typedef int MPI::Comm::Copy_attr_function(const MPI::Comm& \fIoldcomm\fP, |
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| 99 | int \fIcomm_keyval\fP, void* \fIextra_state\fP, void* \fIattribute_val_in\fP, |
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| 100 | void* \fIattribute_val_out\fP, bool& \fIflag\fP); |
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| 101 | .fi |
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| 102 | and |
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| 103 | .nf |
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| 104 | typedef int MPI::Comm::Delete_attr_function(MPI::Comm& \fIcomm\fP, |
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| 105 | int \fIcomm_keyval\fP, void* \fIattribute_val\fP, void* \fIextra_state\fP); |
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| 106 | .fi |
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| 107 | |
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| 108 | .SH FORTRAN 77 NOTES |
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| 109 | .ft R |
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| 110 | The MPI standard prescribes portable Fortran syntax for |
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| 111 | the \fIEXTRA_STATE\fP argument only for Fortran 90. FORTRAN 77 |
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| 112 | users may use the non-portable syntax |
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| 113 | .sp |
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| 114 | .nf |
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| 115 | INTEGER*MPI_ADDRESS_KIND \fIEXTRA_STATE\fP |
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| 116 | .fi |
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| 117 | .sp |
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| 118 | where MPI_ADDRESS_KIND is a constant defined in mpif.h |
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| 119 | and gives the length of the declared integer in bytes. |
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| 120 | |
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| 121 | .SH ERRORS |
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| 122 | 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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| 123 | .sp |
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| 124 | Before the error value is returned, the current MPI error handler is |
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| 125 | 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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| 126 | .sp |
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| 127 | See the MPI man page for a full list of MPI error codes. |
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| 128 | |
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| 129 | .SH SEE ALSO |
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| 130 | .ft R |
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| 131 | .sp |
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| 132 | |
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| 133 | |
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