46 строки
2.3 KiB
Groff
46 строки
2.3 KiB
Groff
.\"Copyright 2006, Sun Microsystems, Inc.
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.\" Copyright (c) 1996 Thinking Machines Corporation
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.TH MPI_Comm_f2c 3OpenMPI "September 2006" "Open MPI 1.2" " "
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.SH NAME
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\fBMPI_Comm_f2c,MPI_Comm_c2f,MPI_File_f2c,MPI_File_c2f,MPI_Info_f2c,MPI_Info_c2f,MPI_Op_f2c,MPI_Op_c2f,MPI_Request_f2c,MPI_Request_c2f,MPI_Type_f2c,MPI_Type_c2f,MPI_Win_f2c,MPI_Win_c2f \fP \- Translates a C handle into a Fortran handle, or vice versa.
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.SH SYNTAX
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.ft R
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.SH C Syntax
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.nf
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#include <mpi.h>
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MPI_Comm MPI_Comm_f2c(MPI_Fint \fIcomm\fP)
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MPI_Fint MPI_Comm_c2f(MPI_Comm \fIcomm\fP)
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MPI_File MPI_File_f2c(MPI_Fint \fIfile\fP)
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MPI_Fint MPI_File_c2f(MPI_File \fIfile\fP)
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MPI_Group MPI_Group_f2c(MPI Fint \fIgroup\fP)
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MPI_Fint MPI_Group_c2f(MPI Group \fIgroup\fP)
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MPI_Info MPI_Info_f2c(MPI_Fint \fIinfo\fP)
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MPI_Fint MPI_Info_c2f(MPI_Info \fIinfo\fP)
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MPI_Op MPI_Op_f2c(MPI_Fint \fIop\fP)
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MPI_Fint MPI_Op_c2f(MPI_Op \fIop\fP)
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MPI_Request MPI_Request_f2c(MPI_Fint \fIrequest\fP)
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MPI_Fint MPI_Request_c2f(MPI_Request \fIrequest\fP)
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MPI_Datatype MPI_Type_f2c(MPI_Fint \fIdatatype\fP)
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MPI_Fint MPI_Type_c2f(MPI_Datatype \fIdatatype\fP)
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MPI_Win MPI_Win_f2c(MPI_Fint \fIwin\fP)
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MPI_Fint MPI_Win_c2f(MPI_Win \fIwin\fP)
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.SH DESCRIPTION
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.ft R
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Handles are passed between Fortran and C or C++ by using an explicit C wrapper to convert Fortran handles to C handles. There is no direct access to C or C++ handles in Fortran. Handles are passed between C and C++ using overloaded C++ operators called from C++ code. There is no direct access to C++ objects from C. The type definition \fIMPI_Fint\fP is provided in C/C++ for an integer of the size that matches a Fortran \fIINTEGER\fP; usually, \fIMPI_Fint\fP will be equivalent to \fIint\fP. The handle translation functions are provided in C to convert from a Fortran handle (which is an integer) to a C handle, and vice versa.
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.PP
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For example, if \fIcomm\fP is a valid Fortran handle to a communicator, then MPI_Comm_f2c returns a valid C handle to that same communicator; if \fIcomm\fP = MPI_COMM_NULL (Fortran value), then MPI_Comm_f2c returns a null C handle; if \fIcomm\fP is an invalid Fortran handle, then MPI_Comm_f2c returns an invalid C handle.
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.SH NOTE
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This function does not return an error value. Consequently, the result of calling it before MPI_Init or after MPI_Finalize is undefined.
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