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NAME

       MPI_Query_thread - Returns the current level of thread support

SYNTAX


C Syntax

       #include <mpi.h>
       int MPI_Query_thread(int *provided)

Fortran Syntax

       INCLUDE 'mpif.h'
       MPI_QUERY_THREAD(PROVIDED, IERROR)
            INTEGER   PROVIDED, IERROR

C++ Syntax

       #include <mpi.h>
       int MPI::Query_thread()

OUTPUT PARAMETERS

       provided  C/Fortran only: Level of thread support (integer).

       IERROR    Fortran only: Error status (integer).

DESCRIPTION

       This  routine  returns in provided the current level of thread support.
       If MPI was initialized by a call to MPI_Init_thread, provided will have
       the same value as was returned by that function.

       The possible values of provided are as follows:

       MPI_THREAD_SINGLE       Only one thread may execute.

       MPI_THREAD_FUNNELED     If  the  process  is  multithreaded,  only  the
                               thread that called MPI_Init[_thread]  may  make
                               MPI calls.

       MPI_THREAD_SERIALIZED   If  the  process  is  multithreaded,  only  one
                               thread may make MPI library calls at one time.

       MPI_THREAD_MULTIPLE     If  the  process  is  multithreaded,   multiple
                               threads   may   call   MPI   at  once  with  no
                               restrictions.

NOTES

       In Open MPI, provided is always MPI_THREAD_SINGLE, unless  the  program
       has  been linked with the multithreaded library, in which case provided
       is MPI_THREAD_MULTIPLE.

ERRORS

       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.

       Before the error value is returned, the current MPI  error  handler  is
       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.

       See the MPI man page for a full list of MPI error codes.

SEE ALSO

       MPI_Init
       MPI_Init_thread



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