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curs_threads(3X)					      curs_threads(3X)

NAME
       use_screen, use_window - curses thread support

SYNOPSIS
       #include <curses.h>

       typedef	 int  (*NCURSES_WINDOW_CB)(WINDOW  *,  void  *);  typedef  int
       (*NCURSES_SCREEN_CB)(SCREEN *, void *);
       int set_escdelay(int size);
       int set_tabsize(int size);
       int use_screen(SCREEN *scr, NCURSES_WINDOW_CB func, void *data);
       int use_window(WINDOW *win, NCURSES_SCREEN_CB func, void *data);

DESCRIPTION
       This implementation can be configured to	 provide  rudimentary  support
       for  multi-threaded  applications.   This  makes a different set of li‐
       braries, e.g., libncursest since the binary interfaces are different.

       Rather than modify the interfaces to pass a thread  specifier  to  each
       function,  it  adds a few functions which can be used in any configura‐
       tion which hide the mutex's needed to prevent  concurrent  use  of  the
       global variables when configured for threading.

       In  addition to forcing access to members of the WINDOW structure to be
       via functions (see curs_opaque(3x)), it makes functions of  the	common
       global  variables,  e.g.,  COLORS,  COLOR_PAIRS, COLS, ESCDELAY, LINES,
       TABSIZE curscr, newscr and ttytype.  Those variables are maintained  as
       read-only values, stored in the SCREEN structure.

       Even this is not enough to make a thread-safe application using curses.
       A multi-threaded application would be expected to have threads updating
       separate	 windows  (within  the	same  device), or updating on separate
       screens (on different devices).	Also, a few of	the  global  variables
       are  considered writable by some applications.  The functions described
       here address these special situations.

       The ESCDELAY and TABSIZE global variables are modified by some applica‐
       tions.	To  modify  them in any configuration, use the set_escdelay or
       set_tabsize functions.  Other global variables are not modifiable.

       The use_window and use_screen functions provide coarse granularity  mu‐
       texes for their respective WINDOW and SCREEN parameters, and call a us‐
       er-supplied function, passing it a data parameter,  and	returning  the
       value from the user-supplied function to the application.

   USAGE
       All  of the ncurses library functions assume that the locale is not al‐
       tered during operation.	In addition, they use data which is maintained
       within a hierarchy of scopes.

	      -	 global	 data, e.g., used in the low-level terminfo or termcap
		 interfaces.

	      -	 terminal data, e.g., associated with a call  to  set_curterm.
		 The terminal data are initialized when screens are created.

	      -	 screen	 data,	e.g.,  associated  with	 a  call to newterm or
		 initscr.

	      -	 window data, e.g., associated with a call to newwin  or  sub‐
		 win.  Windows are associated with screens.  Pads are not nec‐
		 essarily associated with a particular screen.

		 Most curses applications operate on one or more windows with‐
		 in a single screen.

	      -	 reentrant, i.e., it uses only the data passed as parameters.

       This  table lists the scope of data used for each symbol in the ncurses
       library when it is configured to support threading:

	    Symbol		    Scope
	    ─────────────────────────────────────────────────────────────
	    BC			    global
	    COLORS		    screen (readonly)
	    COLOR_PAIR		    reentrant
	    COLOR_PAIRS		    screen (readonly)
	    COLS		    screen (readonly)
	    ESCDELAY		    screen (readonly, see set_escdelay)
	    LINES		    screen (readonly)
	    PAIR_NUMBER		    reentrant
	    PC			    global
	    SP			    global
	    TABSIZE		    screen (readonly)
	    UP			    global
	    acs_map		    screen (readonly)
	    add_wch		    window (stdscr)
	    add_wchnstr		    window (stdscr)
	    add_wchstr		    window (stdscr)
	    addch		    window (stdscr)
	    addchnstr		    window (stdscr)
	    addchstr		    window (stdscr)
	    addnstr		    window (stdscr)
	    addnwstr		    window (stdscr)
	    addstr		    window (stdscr)
	    addwstr		    window (stdscr)
	    assume_default_colors   screen
	    attr_get		    window (stdscr)
	    attr_off		    window (stdscr)
	    attr_on		    window (stdscr)
	    attr_set		    window (stdscr)
	    attroff		    window (stdscr)
	    attron		    window (stdscr)
	    attrset		    window (stdscr)
	    baudrate		    screen
	    beep		    screen
	    bkgd		    window (stdscr)
	    bkgdset		    window (stdscr)
	    bkgrnd		    window (stdscr)
	    bkgrndset		    window (stdscr)
	    boolcodes		    global (readonly)
	    boolfnames		    global (readonly)
	    boolnames		    global (readonly)
	    border		    window (stdscr)
	    border_set		    window (stdscr)
	    box			    window (stdscr)
	    box_set		    window (stdscr)
	    can_change_color	    terminal
	    cbreak		    screen
	    chgat		    window (stdscr)
	    clear		    window (stdscr)
	    clearok		    window
	    clrtobot		    window (stdscr)
	    clrtoeol		    window (stdscr)
	    color_content	    screen
	    color_set		    window (stdscr)
	    copywin		    window locks(source, target)

	    cur_term		    terminal
	    curs_set		    screen
	    curscr		    screen (readonly)
	    curses_version	    global (readonly)
	    def_prog_mode	    terminal
	    def_shell_mode	    terminal
	    define_key		    screen
	    del_curterm		    screen
	    delay_output	    screen
	    delch		    window (stdscr)
	    deleteln		    window (stdscr)
	    delscreen		    global locks(screenlist, screen)
	    delwin		    global locks(windowlist)
	    derwin		    screen
	    doupdate		    screen
	    dupwin		    screen locks(window)
	    echo		    screen
	    echo_wchar		    window (stdscr)
	    echochar		    window (stdscr)
	    endwin		    screen
	    erase		    window (stdscr)
	    erasechar		    window (stdscr)
	    erasewchar		    window (stdscr)
	    filter		    global
	    flash		    terminal
	    flushinp		    screen
	    get_wch		    screen (input-operation)
	    get_wstr		    screen (input-operation)
	    getattrs		    window
	    getbegx		    window
	    getbegy		    window
	    getbkgd		    window
	    getbkgrnd		    window
	    getcchar		    reentrant
	    getch		    screen (input-operation)
	    getcurx		    window
	    getcury		    window
	    getmaxx		    window
	    getmaxy		    window
	    getmouse		    screen (input-operation)
	    getn_wstr		    screen (input-operation)
	    getnstr		    screen (input-operation)
	    getparx		    window
	    getpary		    window
	    getstr		    screen (input-operation)
	    getwin		    screen (input-operation)
	    halfdelay		    screen
	    has_colors		    terminal
	    has_ic		    terminal
	    has_il		    terminal
	    has_key		    screen
	    hline		    window (stdscr)
	    hline_set		    window (stdscr)
	    idcok		    window
	    idlok		    window
	    immedok		    window
	    in_wch		    window (stdscr)
	    in_wchnstr		    window (stdscr)
	    in_wchstr		    window (stdscr)
	    inch		    window (stdscr)
	    inchnstr		    window (stdscr)
	    inchstr		    window (stdscr)
	    init_color		    screen
	    init_pair		    screen
	    initscr		    global locks(screenlist)

	    innstr		    window (stdscr)
	    innwstr		    window (stdscr)
	    ins_nwstr		    window (stdscr)
	    ins_wch		    window (stdscr)
	    ins_wstr		    window (stdscr)
	    insch		    window (stdscr)
	    insdelln		    window (stdscr)
	    insertln		    window (stdscr)
	    insnstr		    window (stdscr)
	    insstr		    window (stdscr)
	    instr		    window (stdscr)
	    intrflush		    terminal
	    inwstr		    window (stdscr)
	    is_cleared		    window
	    is_idcok		    window
	    is_idlok		    window
	    is_immedok		    window
	    is_keypad		    window
	    is_leaveok		    window
	    is_linetouched	    window
	    is_nodelay		    window
	    is_notimeout	    window
	    is_scrollok		    window
	    is_syncok		    window
	    is_term_resized	    terminal
	    is_wintouched	    window
	    isendwin		    screen
	    key_defined		    screen
	    key_name		    global (static data)
	    keybound		    screen
	    keyname		    global (static data)
	    keyok		    screen
	    keypad		    window
	    killchar		    terminal
	    killwchar		    terminal
	    leaveok		    window
	    longname		    screen
	    mcprint		    terminal
	    meta		    screen
	    mouse_trafo		    window (stdscr)
	    mouseinterval	    screen
	    mousemask		    screen
	    move		    window (stdscr)
	    mvadd_wch		    window (stdscr)
	    mvadd_wchnstr	    window (stdscr)
	    mvadd_wchstr	    window (stdscr)
	    mvaddch		    window (stdscr)
	    mvaddchnstr		    window (stdscr)
	    mvaddchstr		    window (stdscr)
	    mvaddnstr		    window (stdscr)
	    mvaddnwstr		    window (stdscr)
	    mvaddstr		    window (stdscr)
	    mvaddwstr		    window (stdscr)
	    mvchgat		    window (stdscr)
	    mvcur		    screen
	    mvdelch		    window (stdscr)
	    mvderwin		    window (stdscr)
	    mvget_wch		    screen (input-operation)
	    mvget_wstr		    screen (input-operation)
	    mvgetch		    screen (input-operation)
	    mvgetn_wstr		    screen (input-operation)
	    mvgetnstr		    screen (input-operation)
	    mvgetstr		    screen (input-operation)
	    mvhline		    window (stdscr)
	    mvhline_set		    window (stdscr)

	    mvin_wch		    window (stdscr)
	    mvin_wchnstr	    window (stdscr)
	    mvin_wchstr		    window (stdscr)
	    mvinch		    window (stdscr)
	    mvinchnstr		    window (stdscr)
	    mvinchstr		    window (stdscr)
	    mvinnstr		    window (stdscr)
	    mvinnwstr		    window (stdscr)
	    mvins_nwstr		    window (stdscr)
	    mvins_wch		    window (stdscr)
	    mvins_wstr		    window (stdscr)
	    mvinsch		    window (stdscr)
	    mvinsnstr		    window (stdscr)
	    mvinsstr		    window (stdscr)
	    mvinstr		    window (stdscr)
	    mvinwstr		    window (stdscr)
	    mvprintw		    window (stdscr)
	    mvscanw		    screen
	    mvvline		    window (stdscr)
	    mvvline_set		    window (stdscr)
	    mvwadd_wch		    window
	    mvwadd_wchnstr	    window
	    mvwadd_wchstr	    window
	    mvwaddch		    window
	    mvwaddchnstr	    window
	    mvwaddchstr		    window
	    mvwaddnstr		    window
	    mvwaddnwstr		    window
	    mvwaddstr		    window
	    mvwaddwstr		    window
	    mvwchgat		    window
	    mvwdelch		    window
	    mvwget_wch		    screen (input-operation)
	    mvwget_wstr		    screen (input-operation)
	    mvwgetch		    screen (input-operation)
	    mvwgetn_wstr	    screen (input-operation)
	    mvwgetnstr		    screen (input-operation)
	    mvwgetstr		    screen (input-operation)
	    mvwhline		    window
	    mvwhline_set	    window
	    mvwin		    window
	    mvwin_wch		    window
	    mvwin_wchnstr	    window
	    mvwin_wchstr	    window
	    mvwinch		    window
	    mvwinchnstr		    window
	    mvwinchstr		    window
	    mvwinnstr		    window
	    mvwinnwstr		    window
	    mvwins_nwstr	    window
	    mvwins_wch		    window
	    mvwins_wstr		    window
	    mvwinsch		    window
	    mvwinsnstr		    window
	    mvwinsstr		    window
	    mvwinstr		    window
	    mvwinwstr		    window
	    mvwprintw		    window
	    mvwscanw		    screen
	    mvwvline		    window
	    mvwvline_set	    window
	    napms		    reentrant
	    newpad		    global locks(windowlist)
	    newscr		    screen (readonly)
	    newterm		    global locks(screenlist)

	    newwin		    global locks(windowlist)
	    nl			    screen
	    nocbreak		    screen
	    nodelay		    window
	    noecho		    screen
	    nofilter		    global
	    nonl		    screen
	    noqiflush		    terminal
	    noraw		    screen
	    notimeout		    window
	    numcodes		    global (readonly)
	    numfnames		    global (readonly)
	    numnames		    global (readonly)
	    ospeed		    global
	    overlay		    window locks(source, target)
	    overwrite		    window locks(source, target)
	    pair_content	    screen
	    pecho_wchar		    screen
	    pechochar		    screen
	    pnoutrefresh	    screen
	    prefresh		    screen
	    printw		    window
	    putp		    global
	    putwin		    window
	    qiflush		    terminal
	    raw			    screen
	    redrawwin		    window
	    refresh		    screen
	    reset_prog_mode	    screen
	    reset_shell_mode	    screen
	    resetty		    terminal
	    resize_term		    screen locks(windowlist)
	    resizeterm		    screen
	    restartterm		    screen
	    ripoffline		    global (static data)
	    savetty		    terminal
	    scanw		    screen
	    scr_dump		    screen
	    scr_init		    screen
	    scr_restore		    screen
	    scr_set		    screen
	    scrl		    window (stdscr)
	    scroll		    window
	    scrollok		    window
	    set_curterm		    screen
	    set_escdelay	    screen
	    set_tabsize		    screen
	    set_term		    global locks(screenlist, screen)
	    setcchar		    reentrant
	    setscrreg		    window (stdscr)
	    setupterm		    global
	    slk_attr		    screen
	    slk_attr_off	    screen
	    slk_attr_on		    screen
	    slk_attr_set	    screen
	    slk_attroff		    screen
	    slk_attron		    screen
	    slk_attrset		    screen
	    slk_clear		    screen
	    slk_color		    screen
	    slk_init		    screen
	    slk_label		    screen
	    slk_noutrefresh	    screen
	    slk_refresh		    screen
	    slk_restore		    screen

	    slk_set		    screen
	    slk_touch		    screen
	    slk_wset		    screen
	    standend		    window
	    standout		    window
	    start_color		    screen
	    stdscr		    screen (readonly)
	    strcodes		    global (readonly)
	    strfnames		    global (readonly)
	    strnames		    global (readonly)
	    subpad		    window
	    subwin		    window
	    syncok		    window
	    term_attrs		    screen
	    termattrs		    screen
	    termname		    terminal
	    tgetent		    global
	    tgetflag		    global
	    tgetnum		    global
	    tgetstr		    global
	    tgoto		    global
	    tigetflag		    terminal
	    tigetnum		    terminal
	    tigetstr		    terminal
	    timeout		    window (stdscr)
	    touchline		    window
	    touchwin		    window
	    tparm		    global (static data)
	    tputs		    screen
	    trace		    global (static data)
	    ttytype		    screen (readonly)
	    typeahead		    screen
	    unctrl		    screen
	    unget_wch		    screen (input-operation)
	    ungetch		    screen (input-operation)
	    ungetmouse		    screen (input-operation)
	    untouchwin		    window
	    use_default_colors	    screen
	    use_env		    global (static data)
	    use_extended_names	    global (static data)
	    use_legacy_coding	    screen
	    use_screen		    global locks(screenlist, screen)
	    use_window		    global locks(windowlist, window)
	    vid_attr		    screen
	    vid_puts		    screen
	    vidattr		    screen
	    vidputs		    screen
	    vline		    window (stdscr)
	    vline_set		    window (stdscr)
	    vw_printw		    window
	    vw_scanw		    screen
	    vwprintw		    window
	    vwscanw		    screen
	    wadd_wch		    window
	    wadd_wchnstr	    window
	    wadd_wchstr		    window
	    waddch		    window
	    waddchnstr		    window
	    waddchstr		    window
	    waddnstr		    window
	    waddnwstr		    window
	    waddstr		    window
	    waddwstr		    window
	    wattr_get		    window
	    wattr_off		    window

	    wattr_on		    window
	    wattr_set		    window
	    wattroff		    window
	    wattron		    window
	    wattrset		    window
	    wbkgd		    window
	    wbkgdset		    window
	    wbkgrnd		    window
	    wbkgrndset		    window
	    wborder		    window
	    wborder_set		    window
	    wchgat		    window
	    wclear		    window
	    wclrtobot		    window
	    wclrtoeol		    window
	    wcolor_set		    window
	    wcursyncup		    screen (affects window plus parents)
	    wdelch		    window
	    wdeleteln		    window
	    wecho_wchar		    window
	    wechochar		    window
	    wenclose		    window
	    werase		    window
	    wget_wch		    screen (input-operation)
	    wget_wstr		    screen (input-operation)
	    wgetbkgrnd		    window
	    wgetch		    screen (input-operation)
	    wgetn_wstr		    screen (input-operation)
	    wgetnstr		    screen (input-operation)
	    wgetparent		    window
	    wgetscrreg		    window
	    wgetstr		    screen (input-operation)
	    whline		    window
	    whline_set		    window
	    win_wch		    window
	    win_wchnstr		    window
	    win_wchstr		    window
	    winch		    window
	    winchnstr		    window
	    winchstr		    window
	    winnstr		    window
	    winnwstr		    window
	    wins_nwstr		    window
	    wins_wch		    window
	    wins_wstr		    window
	    winsch		    window
	    winsdelln		    window
	    winsertln		    window
	    winsnstr		    window
	    winsstr		    window
	    winstr		    window
	    winwstr		    window
	    wmouse_trafo	    window
	    wmove		    window
	    wnoutrefresh	    screen
	    wprintw		    window
	    wredrawln		    window
	    wrefresh		    screen
	    wresize		    window locks(windowlist)
	    wscanw		    screen
	    wscrl		    window
	    wsetscrreg		    window
	    wstandend		    window
	    wstandout		    window
	    wsyncdown		    screen (affects window plus parents)

	    wsyncup		    screen (affects window plus parents)
	    wtimeout		    window
	    wtouchln		    window
	    wunctrl		    global (static data)
	    wvline		    window
	    wvline_set		    window

RETURN VALUE
       These functions all return TRUE or FALSE, except as noted.

NOTES
       Both a macro and a function are provided for each name.

PORTABILITY
       These routines are specific to ncurses.	They  were  not	 supported  on
       Version 7, BSD or System V implementations.  It is recommended that any
       code depending on ncurses extensions be conditioned using  NCURSES_VER‐
       SION.

SEE ALSO
       curses(3X), curs_opaque(3X)

							      curs_threads(3X)
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