64 строки
2.4 KiB
Plaintext
64 строки
2.4 KiB
Plaintext
.\" Copyright 2010 Cisco Systems, Inc. All rights reserved.
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.\" Copyright 2006-2008 Sun Microsystems, Inc.
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.\" Copyright (c) 1996 Thinking Machines
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.TH MPI_Comm_get_parent 3 "#OMPI_DATE#" "#PACKAGE_VERSION#" "#PACKAGE_NAME#"
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.SH NAME
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\fBMPI_Comm_get_parent\fP \- Returns the parent intercommunicator of current spawned process.
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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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int MPI_Comm_get_parent(MPI_Comm *\fIparent\fP)
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.fi
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.SH Fortran Syntax
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.nf
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INCLUDE 'mpif.h'
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MPI_COMM_GET_PARENT(\fIPARENT, IERROR\fP)
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INTEGER \fIPARENT, IERROR \fP
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.fi
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.SH C++ Syntax
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.nf
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#include <mpi.h>
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static MPI::Intercomm MPI::Comm::Get_parent()
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.fi
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.SH OUTPUT PARAMETERS
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.ft R
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.TP 1i
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parent
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The parent communicator (handle).
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.TP 1i
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IERROR
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Fortran only: Error status (integer).
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.SH DESCRIPTION
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.ft R
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If a process was started with MPI_Comm_spawn or MPI_Comm_spawn_multiple, MPI_Comm_get_parent returns the "parent" intercommunicator of the current process. This parent intercommunicator is created implicitly inside of MPI_Init and is the same intercommunicator returned by the spawn call made in the parents.
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.sp
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If the process was not spawned, MPI_Comm_get_parent returns MPI_COMM_NULL.
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.sp
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After the parent communicator is freed or disconnected, MPI_Comm_get_parent returns MPI_COMM_NULL.
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.SH NOTES
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.ft R
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MPI_Comm_get_parent returns a handle to a single intercommunicator. Calling MPI_Comm_get_parent a second time returns a handle to the same intercommunicator. Freeing the handle with MPI_Comm_disconnect or MPI_Comm_free will cause other references to the intercommunicator to become invalid (dangling). Note that calling MPI_Comm_free on the parent communicator is not useful.
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.SH ERRORS
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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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.sp
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Before the error value is returned, the current MPI error handler is
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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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.SH SEE ALSO
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.ft R
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.sp
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.nf
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MPI_Comm_spawn
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MPI_Comm_spawn_multiple
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