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 con- currently from two distinct threads (all MPI_T calls are serial- ized). 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 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_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 4/10/2026 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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