Synopsis

int MPI_Init_thread( int *argc, char ***argv, int required, int *provided )

Input Parameters

argc

Pointer to the number of arguments

argv

Pointer to the argument vector

required

Level of desired thread support

Output Parameter

provided

Level of provided thread support

Command line arguments

Notes

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 concurrently from two distinct threads (all MPI calls are serialized).

MPI_THREAD_MULTIPLE

Multiple threads may call MPI, with no restrictions.

Notes for 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.

MPI_ERR_OTHER

Other error; use MPI_Error_string to get more information about this error code.

See Also

Location:initthread.c