DragonFly On-Line Manual Pages
MPI_Init(3) MPI MPI_Init(3)
MPI_Init - Initialize the MPI execution environment
int MPI_Init( int *argc, char ***argv )
argc - Pointer to the number of arguments
argv - Pointer to the argument vector
THREAD AND SIGNAL SAFETY
This routine must be called by one thread only. That thread is called
the main thread and must be the thread that calls MPI_Finalize .
The MPI standard does not say what a program can do before an MPI_INIT
or after an MPI_FINALIZE . In the MPICH implementation, you should do
as little as possible. In particular, avoid anything that changes the
external state of the program, such as opening files, reading standard
input or writing to standard output.
NOTES FOR FORTRAN
The Fortran binding for MPI_Init has only the error return
subroutine MPI_INIT( ierr )
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.
- No error; MPI routine completed successfully.
- 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.