97 строки
3.5 KiB
Plaintext
97 строки
3.5 KiB
Plaintext
.\" -*- nroff -*-
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.\" Copyright 2013-2014 Los Alamos National Security, LLC. All rights reserved.
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.\" 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 Corporation
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.TH MPI_Compare_and_swap 3 "#OMPI_DATE#" "#PACKAGE_VERSION#" "#PACKAGE_NAME#"
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.SH NAME
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\fBMPI_Compare_and_swap\fP \- Perform RMA compare-and-swap
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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_Compare_and_swap(const void *\fIorigin_addr\fP, const void *\fIcompar_addr\fP,
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void *\fresult_addr\fP, MPI_Datatype \fdatatype\fP, int \fItarget_rank\fP,
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MPI_Aint \fItarget_disp\fP, MPI_Win \fIwin\fP)
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.fi
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.SH Fortran Syntax (see FORTRAN 77 NOTES)
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.nf
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INCLUDE 'mpif.h'
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MPI_COMPARE_AND_SWAP(\fIORIGIN_ADDR, COMPARE_ADDR, RESULT_ADDR, DATATYPE, TARGET_RANK,
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TARGET_DISP, WIN, IERROR\fP)
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<type> \fIORIGIN_ADDR\fP, \fICOMPARE_ADDR\fP, \fIRESULT_ADDR\fP(*)
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INTEGER(KIND=MPI_ADDRESS_KIND) \fITARGET_DISP\fP
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INTEGER \fIDATATYPE, TARGET_RANK, WIN, IERROR \fP
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.fi
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.SH INPUT PARAMETERS
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.ft R
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.TP 1i
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origin_addr
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Initial address of buffer (choice).
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.ft R
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.TP
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compare_addr
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Initial address of compare buffer (choice).
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.ft R
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.TP
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result_addr
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Initial address of result buffer (choice).
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.ft R
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.TP
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datatype
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Data type of the entry in origin, result, and target buffers (handle).
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.ft R
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.TP 1i
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target_rank
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Rank of target (nonnegative integer).
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.ft R
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.TP 1i
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target_disp
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Displacement from start of window to beginning of target buffer (nonnegative integer).
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.ft R
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.TP 1i
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win
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Window object (handle).
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.SH OUTPUT PARAMETER
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.ft R
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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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This function compares one element of type \fIdatatype\fP in the compare buffer \fIcompare_addr\fP with the buffer at offset \fItarget_disp\fP in the target window specified by \fItarget_rank\fP and \fIwin\fP and replaces the value at the target with the value in the origin buffer \fIorigin_addr\fP if the compare buffer and the target buffer are identical. The original value at the target is returned in the buffer \fIresult_addr\fP. The parameter \fIdatatype\fP must belong to one of the following categories of predefined datatypes: C integer, Fortran integer, Logical, Multi-language types, or Byte as specified in MPI-3 § 5.9.2 on page 176.
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.sp
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The origin and result buffers (\fIorigin_addr\fP and \fIresult_addr\fP) must be disjoint.
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.SH FORTRAN 77 NOTES
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.ft R
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The MPI standard prescribes portable Fortran syntax for
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the \fITARGET_DISP\fP argument only for Fortran 90. FORTRAN 77
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users may use the non-portable syntax
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.sp
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.nf
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INTEGER*MPI_ADDRESS_KIND \fITARGET_DISP\fP
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.fi
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.sp
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where MPI_ADDRESS_KIND is a constant defined in mpif.h
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and gives the length of the declared integer in bytes.
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.SH NOTES
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It is the user's responsibility to guarantee that, when
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using the accumulate functions, the target displacement argument is such
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that accesses to the window are properly aligned according to the data
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type arguments in the call to the \fBMPI_Compare_and_swap\fP function.
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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.
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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
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may be changed with \fBMPI_Comm_set_errhandler\fP; 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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