debian man page for mpi_query_thread

MPI_Query_thread(3)							MPI						       MPI_Query_thread(3)

NAME
       MPI_Query_thread -  Return the level of thread support provided by the MPI  library

SYNOPSIS
       int MPI_Query_thread( int *provided )

OUTPUT PARAMETER
       provided
	      - Level of thread support provided.  This is the same value that was returned in the provided argument in MPI_Init_thread .

NOTES
       The valid values for the level of thread support are:
       MPI_THREAD_SINGLE
	      - Only one thread will execute.
       MPI_THREAD_FUNNELED
	      - The process may be multi-threaded, but only the main thread will make MPI calls (all MPI calls are funneled to the main thread).
       MPI_THREAD_SERIALIZED
	      - The process may be multi-threaded, and multiple threads may make MPI calls, but only one at a time: MPI calls are not made concur-
	      rently from two distinct threads (all MPI calls are serialized).
       MPI_THREAD_MULTIPLE
	      - Multiple threads may call MPI, with no restrictions.

	      If MPI_Init was called instead of MPI_Init_thread , the level of thread support is defined  by  the  implementation.   This  routine
	      allows  you to find out the provided level.  It is also useful for library routines that discover that MPI has already been initial-
	      ized and wish to determine what level of thread support is available.

THREAD AND INTERRUPT SAFETY
       This routine is both thread- and interrupt-safe.  This means that this routine may safely be used by multiple threads  and  from  within  a
       signal handler.

NOTES FOR FORTRAN
       All  MPI  routines in Fortran (except for MPI_WTIME and MPI_WTICK ) have an additional argument ierr at the end of the argument list.  ierr
       is an integer and has the same meaning as the return value of the routine in C.	In Fortran, MPI routines are subroutines, and are  invoked
       with the call statement.

       All MPI objects (e.g., MPI_Datatype , MPI_Comm ) are of type INTEGER in Fortran.

ERRORS
       All  MPI  routines (except MPI_Wtime and MPI_Wtick ) return an error value; C routines as the value of the function and Fortran routines in
       the last argument.  Before the value is returned, the current MPI error handler is called.  By default, this error handler aborts  the  MPI
       job.   The  error  handler  may	be  changed  with  MPI_Comm_set_errhandler  (for  communicators), MPI_File_set_errhandler (for files), and
       MPI_Win_set_errhandler (for RMA windows).  The MPI-1 routine MPI_Errhandler_set may be used but its  use  is  deprecated.   The	predefined
       error handler MPI_ERRORS_RETURN may be used to cause error values to be returned.  Note that MPI does not guarentee that an MPI program can
       continue past an error; however, MPI implementations will attempt to continue whenever possible.

       MPI_SUCCESS
	      - No error; MPI routine completed successfully.

LOCATION
       querythread.c

								     11/6/2008						       MPI_Query_thread(3)