MPI_Init_thread(3) MPI MPI_Init_thread(3) NAME MPI_Init_thread - Initialize the MPI execution environment SYNOPSIS int MPI_Init_thread(int *argc, char ***argv, int required, int *provided) INPUT PARAMETERS required - desired level of thread support (integer) INPUT/OUTPUT PARAMETERS argc - argc (None) argv - argv (None) OUTPUT PARAMETERS provided - provided level of thread support (integer) COMMAND LINE ARGUMENTS MPI specifies no command-line arguments but does allow an MPI implementa- tion to make use of them. See MPI_INIT for a description of the command line arguments supported by MPI_INIT and MPI_INIT_THREAD . NOTES The valid values for the level of thread support are: 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 concur- rently from two distinct threads (all MPI calls are serialized). MPI_THREAD_MULTIPLE - Multiple threads may call MPI, with no restrictions. NOTES FOR FORTRAN Note that the Fortran binding for this routine does not have the argc and argv arguments. ( MPI_INIT_THREAD(required, provided, ierror) ) 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 ar- gument. Before the value is returned, the current MPI error handler is called. By default, this error handler aborts the MPI job. The error han- dler 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 guarantee 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 MPI_Init, MPI_Finalize 4/10/2026 MPI_Init_thread(3)
NAME | SYNOPSIS | INPUT PARAMETERS | INPUT/OUTPUT PARAMETERS | OUTPUT PARAMETERS | COMMAND LINE ARGUMENTS | NOTES | NOTES FOR FORTRAN | ERRORS | SEE ALSO
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