MPI_T_init_thread - Initialize the MPI_T execution environment

       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_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.

required
              - desired level of thread support (integer)

       MPI_T_init_thread -  Initialize the MPI_T execution environment

provided
              - provided level of thread support (integer)

       MPI_T_finalize

                                                    1/21/2022                               MPI_T_init_thread(3)

       #ifdef ENABLE_QMPI
       #ifndef MPICH_MPI_FROM_PMPI
       int QMPI_T_init_thread(QMPI_Context context, int tool_id, int required,
       int *provided) MPICH_API_PUBLIC

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.

       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.