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Bassem Girgis
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.\" -*- nroff -*-
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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
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.\" $COPYRIGHT$
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.TH MPI_Query_thread 3 "Mar 26, 2019" "4.0.1" "Open MPI"
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.SH NAME
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\fBMPI_Query_thread\fP \- Returns the current level of thread support
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.\" Man page generated from reStructuredText.
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.
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.TH "MPI_QUERY_THREAD" "3" "Feb 14, 2025" "" "Open MPI"
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.
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.nr rst2man-indent-level 0
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.
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.de1 rstReportMargin
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level \\n[rst2man-indent-level]
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level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
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..
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.de1 INDENT
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.\" .rstReportMargin pre:
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. RS \\$1
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. nr rst2man-indent\\n[rst2man-indent-level] \\n[an-margin]
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. nr rst2man-indent-level +1
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..
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.de UNINDENT
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. RE
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.\" indent \\n[an-margin]
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.\" old: \\n[rst2man-indent\\n[rst2man-indent-level]]
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.nr rst2man-indent-level -1
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.\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
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.in \\n[rst2man-indent\\n[rst2man-indent-level]]u
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..
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.sp
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\fI\%MPI_Query_thread\fP — Returns the current level of thread support
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.SH SYNTAX
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.ft R
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.SH C Syntax
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.SS C Syntax
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.INDENT 0.0
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.INDENT 3.5
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.sp
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.nf
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.ft C
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#include <mpi.h>
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int MPI_Query_thread(int *\fIprovided\fP)
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int MPI_Query_thread(int *provided)
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.ft P
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.fi
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.UNINDENT
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.UNINDENT
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.SS Fortran Syntax
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.INDENT 0.0
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.INDENT 3.5
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.sp
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.nf
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.ft C
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USE MPI
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! or the older form: INCLUDE \(aqmpif.h\(aq
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MPI_QUERY_THREAD(PROVIDED, IERROR)
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INTEGER PROVIDED, IERROR
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.ft P
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.fi
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.UNINDENT
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.UNINDENT
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.SS Fortran 2008 Syntax
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.INDENT 0.0
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.INDENT 3.5
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.sp
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.nf
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.ft C
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USE mpi_f08
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MPI_Query_thread(provided, ierror)
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INTEGER, INTENT(OUT) :: provided
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INTEGER, OPTIONAL, INTENT(OUT) :: ierror
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.ft P
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.fi
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.UNINDENT
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.UNINDENT
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.SH OUTPUT PARAMETERS
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.ft R
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.TP 1i
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provided
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C/Fortran only: Level of thread support (integer).
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.TP 1i
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IERROR
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Fortran only: Error status (integer).
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.INDENT 0.0
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.IP \(bu 2
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\fBprovided\fP: C/Fortran only: Level of thread support (integer).
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.IP \(bu 2
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\fBierror\fP: Fortran only: Error status (integer).
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.UNINDENT
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.SH DESCRIPTION
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.ft R
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This routine returns in \fIprovided\fP the current level of thread
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support. If MPI was initialized by a call to MPI_Init_thread,
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\fIprovided\fP will have the same value as was returned by that
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function.
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.sp
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This routine returns in \fIprovided\fP the current level of thread support.
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If MPI was initialized by a call to \fI\%MPI_Init_thread\fP, \fIprovided\fP will
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have the same value as was returned by that function.
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.sp
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The possible values of \fIprovided\fP are as follows:
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.TP 2.4i
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MPI_THREAD_SINGLE
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.INDENT 0.0
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.TP
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.B MPI_THREAD_SINGLE
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Only one thread may execute.
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.TP 2.4i
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MPI_THREAD_FUNNELED
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If the process is multithreaded, only the thread
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that called MPI_Init[_thread] may make MPI calls.
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.TP 2.4i
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MPI_THREAD_SERIALIZED
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If the process is multithreaded, only one thread
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may make MPI library calls at one time.
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.TP 2.4i
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MPI_THREAD_MULTIPLE
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If the process is multithreaded, multiple threads
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may call MPI at once with no restrictions.
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.TP
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.B MPI_THREAD_FUNNELED
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If the process is multithreaded, only the thread that called
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MPI_Init[_thread] may make MPI calls.
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.TP
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.B MPI_THREAD_SERIALIZED
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If the process is multithreaded, only one thread may make MPI library
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calls at one time.
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.TP
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.B MPI_THREAD_MULTIPLE
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If the process is multithreaded, multiple threads may call MPI at
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once with no restrictions.
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.UNINDENT
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.SH NOTES
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.ft R
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In Open MPI, \fIprovided\fP is always MPI_THREAD_SINGLE, unless the
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program has been linked with the multithreaded library, in which case
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\fIprovided\fP is MPI_THREAD_MULTIPLE.
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.sp
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In Open MPI, \fIprovided\fP is always MPI_THREAD_SINGLE, unless the program
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has been linked with the multithreaded library, in which case \fIprovided\fP
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is MPI_THREAD_MULTIPLE.
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.SH ERRORS
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.ft R
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Almost all MPI routines return an error value; C routines as
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the value of the function and Fortran routines in the last argument. C++
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functions do not return errors. If the default error handler is set to
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MPI::ERRORS_THROW_EXCEPTIONS, then on error the C++ exception mechanism
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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
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I/O function errors. The error handler may be changed with
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MPI_Comm_set_errhandler; the predefined error handler MPI_ERRORS_RETURN
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may be used to cause error values to be returned. Note that MPI does not
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guarantee that an MPI program can continue past an error.
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Almost all MPI routines return an error value; C routines as the return result
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of the function and Fortran routines in the last argument.
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.sp
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See the MPI man page for a full list of MPI error codes.
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.SH SEE ALSO
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.ft R
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.nf
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MPI_Init
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MPI_Init_thread
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Before the error value is returned, the current MPI error handler associated
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with the communication object (e.g., communicator, window, file) is called.
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If no communication object is associated with the MPI call, then the call is
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considered attached to MPI_COMM_SELF and will call the associated MPI error
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handler. When MPI_COMM_SELF is not initialized (i.e., before
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\fI\%MPI_Init\fP/\fI\%MPI_Init_thread\fP, after \fI\%MPI_Finalize\fP, or when using the Sessions
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Model exclusively) the error raises the initial error handler. The initial
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error handler can be changed by calling \fI\%MPI_Comm_set_errhandler\fP on
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MPI_COMM_SELF when using the World model, or the mpi_initial_errhandler CLI
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argument to mpiexec or info key to \fI\%MPI_Comm_spawn\fP/\fI\%MPI_Comm_spawn_multiple\fP\&.
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If no other appropriate error handler has been set, then the MPI_ERRORS_RETURN
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error handler is called for MPI I/O functions and the MPI_ERRORS_ABORT error
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handler is called for all other MPI functions.
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.sp
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Open MPI includes three predefined error handlers that can be used:
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.INDENT 0.0
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.IP \(bu 2
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\fBMPI_ERRORS_ARE_FATAL\fP
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Causes the program to abort all connected MPI processes.
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.IP \(bu 2
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\fBMPI_ERRORS_ABORT\fP
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An error handler that can be invoked on a communicator,
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window, file, or session. When called on a communicator, it
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acts as if \fI\%MPI_Abort\fP was called on that communicator. If
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called on a window or file, acts as if \fI\%MPI_Abort\fP was called
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on a communicator containing the group of processes in the
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corresponding window or file. If called on a session,
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aborts only the local process.
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.IP \(bu 2
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\fBMPI_ERRORS_RETURN\fP
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Returns an error code to the application.
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.UNINDENT
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.sp
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MPI applications can also implement their own error handlers by calling:
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.INDENT 0.0
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.IP \(bu 2
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\fI\%MPI_Comm_create_errhandler\fP then \fI\%MPI_Comm_set_errhandler\fP
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.IP \(bu 2
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\fI\%MPI_File_create_errhandler\fP then \fI\%MPI_File_set_errhandler\fP
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.IP \(bu 2
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\fI\%MPI_Session_create_errhandler\fP then \fI\%MPI_Session_set_errhandler\fP or at \fI\%MPI_Session_init\fP
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.IP \(bu 2
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\fI\%MPI_Win_create_errhandler\fP then \fI\%MPI_Win_set_errhandler\fP
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.UNINDENT
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.sp
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Note that MPI does not guarantee that an MPI program can continue past
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an error.
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.sp
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See the \fI\%MPI man page\fP for a full list of \fI\%MPI error codes\fP\&.
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.sp
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See the Error Handling section of the MPI\-3.1 standard for
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more information.
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.sp
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\fBSEE ALSO:\fP
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.INDENT 0.0
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.INDENT 3.5
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.INDENT 0.0
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.IP \(bu 2
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\fI\%MPI_Init\fP
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.IP \(bu 2
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\fI\%MPI_Init_thread\fP
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.UNINDENT
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.UNINDENT
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.UNINDENT
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.SH COPYRIGHT
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2003-2025, The Open MPI Community
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.\" Generated by docutils manpage writer.
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.
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