MPI_Init_thread(3)						      LAM/MPI							MPI_Init_thread(3)

NAME

       MPI_Init_thread -  Initialize the MPI execution environment

SYNOPSIS

       #include <mpi.h>
       int
       MPI_Init_thread(int *pargc, char ***pargv, int requested, int *pprovided)

INPUT PARAMETERS

       pargc  - Pointer to the number of arguments
       pargv  - Pointer to the argument vector
       requested
	      - Desired level of thread support
       pprovided
	      - Given level of thread support

NOTES

       This function is mainly here for link-compatability.  It will [currently] only ever return MPI_THREAD_SINGLE in pprovided
	.   Future  versions  of  LAM/MPI  will  support multi-threaded user programs, in which case this function must be used to initialize MPI.
       Hence, programmers can use this function now in order to program for future flexibility.

       For the moment, however, see MPI_Init (3).

ERRORS

       If an error occurs in an MPI function, the current MPI error handler is called to handle it.  By default, this error handler aborts the MPI
       job.   The error handler may be changed with MPI_Errhandler_set ; the predefined error handler MPI_ERRORS_RETURN may be used to cause error
       values to be returned (in C and Fortran; this error handler is less useful in with the C++ MPI  bindings.   The	predefined  error  handler
       MPI::ERRORS_THROW_EXCEPTIONS should be used in C++ if the error value needs to be recovered).  Note that MPI does not guarantee that an MPI
       program can continue past an error.

       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.  The C++ bindings for MPI do not return error values; instead, error values are communicated by throwing exceptions of
       type MPI::Exception (but not by default).  Exceptions are only thrown if the error value is not MPI::SUCCESS
	.

       Note that if the MPI::ERRORS_RETURN handler is set in C++, while MPI functions will return upon an error, there will be no way  to  recover
       what the actual error value was.
       MPI_SUCCESS
	      - No error; MPI routine completed successfully.
       MPI_ERR_ARG
	      -  Invalid argument.  Some argument is invalid and is not identified by a specific error class.  This is typically a NULL pointer or
	      other such error.
       MPI_ERR_OTHER
	      - This error class is associated with an error code that indicates that an  attempt  was	made  to  call	MPI_INIT  a  second  time.
	      MPI_INIT may only be called once in a program.
       MPI_ERR_OTHER
	      - Other error; use MPI_Error_string to get more information about this error code.

SEE ALSO

       MPI_Init, MPI_Finalize, lamboot, mpirun, lamhalt

MORE INFORMATION

       For  more  information,	please	see the official MPI Forum web site, which contains the text of both the MPI-1 and MPI-2 standards.  These
       documents contain detailed information about each MPI function (most of which is not duplicated in these man pages).

       http://www.mpi-forum.org/

ACKNOWLEDGEMENTS

       The LAM Team would like the thank the MPICH Team for the handy program to generate man pages ("doctext" from ftp://ftp.mcs.anl.gov/pub/sow-
       ing/sowing.tar.gz ), the initial formatting, and some initial text for most of the MPI-1 man pages.

LOCATION

       initthr.c

LAM
/MPI 6.5.8							    11/10/2002							MPI_Init_thread(3)