MPIQuerythread(3OpenMPI) MPIQuerythread(3OpenMPI)

NAME
       MMPPIIQQuueerryytthhrreeaadd - Returns the current level of thread support


SSYYNNTTAAXX
CC SSyynnttaaxx
       #include 
       int MPIQuerythread(int *provided)


FFoorrttrraann SSyynnttaaxx
       INCLUDE 'mpif.h'
       MPIQUERYTHREAD(PROVIDED, IERROR)
            INTEGER   PROVIDED, IERROR


CC++++ SSyynnttaaxx
       #include 
       int MPI::Querythread()


OOUUTTPPUUTT PPAARRAAMMEETTEERRSS
       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 MPIInitthread, provided will have
       the same value as was returned by that function.

       The possible values of provided are as follows:

       MPITHREADSINGLE       Only one thread may execute.

       MPITHREADFUNNELED     If  the  process  is  multithreaded,  only  the
                               thread that called MPIInit[thread]  may  make
                               MPI calls.

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

       MPITHREADMULTIPLE     If   the  process  is  multithreaded,  multiple
                               threads may call MPI at once with  no  restric-
                               tions.


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


EERRRROORRSS
       Almost  all MPI routines return an error value; C routines as the value
       of the function and Fortran routines in the last  argument.  C++  func-
       tions  do  not  return  errors.  If the default error handler is set to
       MPI::ERRORSTHROWEXCEPTIONS, 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
       MPICommseterrhandler; the predefined error handler MPIERRORSRETURN
       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
       MPIInit
       MPIInitthread




Open MPI 1.2                    September 2006      MPIQuerythread(3OpenMPI)