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MPI_T_init_thread(3) MPI MPI_T_init_thread(3) NAME MPI_T_init_thread - Initialize the MPI_T execution environment SYNOPSIS int MPI_T_init_thread(int required, int *provided) INPUT PARAMETERS required - desired level of thread support (integer) OUTPUT PARAMETERS provided - provided level of thread support (integer) 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_T calls (all MPI_T calls are funneled to the main thread). MPI_THREAD_SERIALIZED - The process may be multi-threaded, and multiple threads may make MPI_T calls, but only one at a time: MPI_T calls are not made concurrently from two distinct threads (all MPI_T calls are serialized). MPI_THREAD_MULTIPLE - Multiple threads may call MPI_T, with no restrictions. THREAD AND INTERRUPT SAFETY This routine is thread-safe. This means that this routine may be safely used by multiple threads without the need for any user-provided thread locks. However, the routine is not interrupt safe. Typically, this is due to the use of memory allocation routines such as malloc or other non-MPICH runtime routines that are themselves not interrupt- safe. 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 com- municators), MPI_File_set_errhandler (for files), and MPI_Win_set_er- rhandler (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 when- ever possible. MPI_SUCCESS - No error; MPI routine completed successfully. MPI_T_ERR_INVALID - Invalid use of the interface or bad parameter values(s). MPI_ERR_OTHER - Other error; use MPI_Error_string to get more information about this error code. SEE ALSO MPI_T_finalize 2/3/2025 MPI_T_init_thread(3)
NAME | SYNOPSIS | INPUT PARAMETERS | OUTPUT PARAMETERS | NOTES | THE VALID VALUES FOR THE LEVEL OF THREAD SUPPORT ARE | THREAD AND INTERRUPT SAFETY | ERRORS | SEE ALSO
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