NAME

       MPI_Init_thread -  Initialize the MPI execution environment

SYNOPSIS

       #ifdef ENABLE_QMPI
       #ifndef MPICH_MPI_FROM_PMPI
       int QMPI_Init_thread(QMPI_Context context, int tool_id, int *argc, char ***argv, int required,
       int *provided) MPICH_API_PUBLIC

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 implementation 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  concurrently  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 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 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

                                                    1/21/2022                                 MPI_Init_thread(3)