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 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.
- 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 program.
- 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/sow-
ing/sowing.tar.gz ), the initial formatting, and some initial text for most of the MPI-1 man pages.
/MPI 6.5.8 11/10/2002 MPI_Init_thread(3)