MPI_Init_thread(3) LAM/MPI MPI_Init_thread(3)
MPI_Init_thread - Initialize the MPI execution environment
MPI_Init_thread(int *pargc, char ***pargv, int requested, int *pprovided)
pargc - Pointer to the number of arguments
pargv - Pointer to the argument vector
- Desired level of thread support
- Given level of thread support
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).
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 excep-
tions 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.
- No error; MPI routine completed successfully.
- 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.
- 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
- Other error; use MPI_Error_string to get more information about this error code.
MPI_Init, MPI_Finalize, lamboot, mpirun, lamhalt
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).
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/sowing/sowing.tar.gz ), the initial for-
matting, and some initial text for most of the MPI-1 man pages.
LAM/MPI 6.5.8 11/10/2002 MPI_Init_thread(3)