doc/html/man/curs_threads.3x.html

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  35 <HEAD>
  36 <TITLE>curs_threads 3x</TITLE>
  37 <link rev=made href="mailto:bug-ncurses@gnu.org">
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  40 <BODY>
  41 <H1>curs_threads 3x</H1>
  42 <HR>
  43 <PRE>
  44 <!-- Manpage converted by man2html 3.0.1 -->
  45 <STRONG><A HREF="curs_threads.3x.html">curs_threads(3x)</A></STRONG>                                       <STRONG><A HREF="curs_threads.3x.html">curs_threads(3x)</A></STRONG>
  46
  47
  48
  49
  50 </PRE>
  51 <H2>NAME</H2><PRE>
  52        <STRONG>use_screen</STRONG>, <STRONG>use_window</STRONG> - <STRONG>curses</STRONG> thread support
  53
  54
  55 </PRE>
  56 <H2>SYNOPSIS</H2><PRE>
  57        <STRONG>#include</STRONG> <STRONG>&lt;curses.h&gt;</STRONG>
  58
  59        <STRONG>typedef</STRONG> <STRONG>int</STRONG> <STRONG>(*NCURSES_WINDOW_CB)(WINDOW</STRONG> <STRONG>*,</STRONG> <STRONG>void</STRONG> <STRONG>*);</STRONG>
  60        <STRONG>typedef</STRONG> <STRONG>int</STRONG> <STRONG>(*NCURSES_SCREEN_CB)(SCREEN</STRONG> <STRONG>*,</STRONG> <STRONG>void</STRONG> <STRONG>*);</STRONG>
  61        <STRONG>int</STRONG> <STRONG>get_escdelay(void);</STRONG>
  62        <STRONG>int</STRONG> <STRONG>set_escdelay(int</STRONG> <STRONG>size);</STRONG>
  63        <STRONG>int</STRONG> <STRONG>set_tabsize(int</STRONG> <STRONG>size);</STRONG>
  64        <STRONG>int</STRONG>  <STRONG>use_screen(SCREEN</STRONG>  <STRONG>*scr,</STRONG> <STRONG>NCURSES_WINDOW_CB</STRONG> <STRONG>func,</STRONG> <STRONG>void</STRONG>
  65        <STRONG>*data);</STRONG>
  66        <STRONG>int</STRONG> <STRONG>use_window(WINDOW</STRONG> <STRONG>*win,</STRONG> <STRONG>NCURSES_SCREEN_CB</STRONG>  <STRONG>func,</STRONG>  <STRONG>void</STRONG>
  67        <STRONG>*data);</STRONG>
  68
  69
  70 </PRE>
  71 <H2>DESCRIPTION</H2><PRE>
  72        This  implementation can be configured to provide rudimen-
  73        tary support for multi-threaded applications.  This  makes
  74        a  different set of libraries, e.g., <EM>libncursest</EM> since the
  75        binary interfaces are different.
  76
  77        Rather than modify the interfaces to pass a thread  speci-
  78        fier  to  each function, it adds a few functions which can
  79        be used in any configuration which hide the mutex's needed
  80        to  prevent  concurrent  use  of the global variables when
  81        configured for threading.
  82
  83        In addition to forcing access to  members  of  the  <STRONG>WINDOW</STRONG>
  84        structure  to  be  via functions (see <STRONG><A HREF="curs_opaque.3x.html">curs_opaque(3x)</A></STRONG>), it
  85        makes functions of the common global variables, e.g., COL-
  86        ORS,  COLOR_PAIRS,  COLS, ESCDELAY, LINES, TABSIZE curscr,
  87        newscr and ttytype.  Those  variables  are  maintained  as
  88        read-only values, stored in the <STRONG>SCREEN</STRONG> structure.
  89
  90        Even  this is not enough to make a thread-safe application
  91        using curses.  A multi-threaded application would  be  ex-
  92        pected  to  have threads updating separate windows (within
  93        the same device), or updating on separate screens (on dif-
  94        ferent  devices).  Also, a few of the global variables are
  95        considered writable by some applications.   The  functions
  96        described here address these special situations.
  97
  98        The  ESCDELAY and TABSIZE global variables are modified by
  99        some applications.  To modify them in  any  configuration,
 100        use  the  <STRONG>set_escdelay</STRONG>  or  <STRONG>set_tabsize</STRONG>  functions.  Other
 101        global variables are not modifiable.
 102
 103        The <STRONG>get_escdelay</STRONG> function returns the value for ESCDELAY.
 104
 105        The <STRONG>use_window</STRONG> and  <STRONG>use_screen</STRONG>  functions  provide  coarse
 106        granularity mutexes for their respective <STRONG>WINDOW</STRONG> and <STRONG>SCREEN</STRONG>
 107        parameters, and call a user-supplied function, passing  it
 108        a  <EM>data</EM>  parameter, and returning the value from the user-
 109        supplied function to the application.
 110
 111    <STRONG>USAGE</STRONG>
 112        All of the ncurses library functions assume that  the  lo-
 113        cale  is  not altered during operation.  In addition, they
 114        use data which is maintained within a hierarchy of scopes.
 115
 116           <STRONG>o</STRONG>   global data, e.g., used in the  low-level  terminfo
 117               or termcap interfaces.
 118
 119           <STRONG>o</STRONG>   terminal  data,  e.g.,  associated  with  a call to
 120               <EM>set</EM><STRONG>_</STRONG><EM>curterm</EM>.  The  terminal  data  are  initialized
 121               when screens are created.
 122
 123           <STRONG>o</STRONG>   screen  data,  e.g.,  associated  with  a  call  to
 124               <EM>newterm</EM> or <EM>initscr</EM>.
 125
 126           <STRONG>o</STRONG>   window data, e.g., associated with a call to <EM>newwin</EM>
 127               or  <EM>subwin</EM>.   Windows  are associated with screens.
 128               Pads are not necessarily associated with a particu-
 129               lar screen.
 130
 131               Most  curses  applications  operate  on one or more
 132               windows within a single screen.
 133
 134           <STRONG>o</STRONG>   reentrant, i.e., it uses only the  data  passed  as
 135               parameters.
 136
 137        This table lists the scope of data used for each symbol in
 138        the ncurses library  when  it  is  configured  to  support
 139        threading:
 140
 141       Symbol                  Scope
 142       -------------------------------------------------------------
 143       BC                      global
 144       COLORS                  screen (readonly)
 145       COLOR_PAIR              reentrant
 146       COLOR_PAIRS             screen (readonly)
 147       COLS                    screen (readonly)
 148       ESCDELAY                screen (readonly, see <EM>set</EM><STRONG>_</STRONG><EM>escdelay</EM>)
 149       LINES                   screen (readonly)
 150       PAIR_NUMBER             reentrant
 151       PC                      global
 152       SP                      global
 153       TABSIZE                 screen (readonly)
 154       UP                      global
 155       acs_map                 screen (readonly)
 156       add_wch                 window (stdscr)
 157       add_wchnstr             window (stdscr)
 158       add_wchstr              window (stdscr)
 159       addch                   window (stdscr)
 160       addchnstr               window (stdscr)
 161       addchstr                window (stdscr)
 162       addnstr                 window (stdscr)
 163       addnwstr                window (stdscr)
 164       addstr                  window (stdscr)
 165       addwstr                 window (stdscr)
 166       assume_default_colors   screen
 167       attr_get                window (stdscr)
 168       attr_off                window (stdscr)
 169       attr_on                 window (stdscr)
 170       attr_set                window (stdscr)
 171       attroff                 window (stdscr)
 172       attron                  window (stdscr)
 173       attrset                 window (stdscr)
 174       baudrate                screen
 175       beep                    screen
 176       bkgd                    window (stdscr)
 177       bkgdset                 window (stdscr)
 178       bkgrnd                  window (stdscr)
 179       bkgrndset               window (stdscr)
 180       boolcodes               global (readonly)
 181       boolfnames              global (readonly)
 182       boolnames               global (readonly)
 183       border                  window (stdscr)
 184
 185       border_set              window (stdscr)
 186       box                     window (stdscr)
 187       box_set                 window (stdscr)
 188       can_change_color        terminal
 189       cbreak                  screen
 190       chgat                   window (stdscr)
 191       clear                   window (stdscr)
 192       clearok                 window
 193       clrtobot                window (stdscr)
 194       clrtoeol                window (stdscr)
 195       color_content           screen
 196       color_set               window (stdscr)
 197       copywin                 window locks(source, target)
 198       cur_term                terminal
 199       curs_set                screen
 200       curscr                  screen (readonly)
 201       curses_version          global (readonly)
 202       def_prog_mode           terminal
 203       def_shell_mode          terminal
 204       define_key              screen
 205       del_curterm             screen
 206       delay_output            screen
 207       delch                   window (stdscr)
 208       deleteln                window (stdscr)
 209       delscreen               global locks(screenlist, screen)
 210       delwin                  global locks(windowlist)
 211       derwin                  screen
 212       doupdate                screen
 213       dupwin                  screen locks(window)
 214       echo                    screen
 215       echo_wchar              window (stdscr)
 216       echochar                window (stdscr)
 217       endwin                  screen
 218       erase                   window (stdscr)
 219       erasechar               window (stdscr)
 220       erasewchar              window (stdscr)
 221       filter                  global
 222       flash                   terminal
 223       flushinp                screen
 224       get_wch                 screen (input-operation)
 225       get_wstr                screen (input-operation)
 226       getattrs                window
 227       getbegx                 window
 228       getbegy                 window
 229       getbkgd                 window
 230       getbkgrnd               window
 231       getcchar                reentrant
 232       getch                   screen (input-operation)
 233       getcurx                 window
 234       getcury                 window
 235       getmaxx                 window
 236       getmaxy                 window
 237       getmouse                screen (input-operation)
 238       getn_wstr               screen (input-operation)
 239       getnstr                 screen (input-operation)
 240       getparx                 window
 241       getpary                 window
 242       getstr                  screen (input-operation)
 243       getwin                  screen (input-operation)
 244       halfdelay               screen
 245       has_colors              terminal
 246       has_ic                  terminal
 247       has_il                  terminal
 248       has_key                 screen
 249       hline                   window (stdscr)
 250       hline_set               window (stdscr)
 251
 252       idcok                   window
 253       idlok                   window
 254       immedok                 window
 255       in_wch                  window (stdscr)
 256       in_wchnstr              window (stdscr)
 257       in_wchstr               window (stdscr)
 258       inch                    window (stdscr)
 259       inchnstr                window (stdscr)
 260       inchstr                 window (stdscr)
 261       init_color              screen
 262       init_pair               screen
 263       initscr                 global locks(screenlist)
 264       innstr                  window (stdscr)
 265       innwstr                 window (stdscr)
 266       ins_nwstr               window (stdscr)
 267       ins_wch                 window (stdscr)
 268       ins_wstr                window (stdscr)
 269       insch                   window (stdscr)
 270       insdelln                window (stdscr)
 271       insertln                window (stdscr)
 272       insnstr                 window (stdscr)
 273       insstr                  window (stdscr)
 274       instr                   window (stdscr)
 275       intrflush               terminal
 276       inwstr                  window (stdscr)
 277       is_cleared              window
 278       is_idcok                window
 279       is_idlok                window
 280       is_immedok              window
 281       is_keypad               window
 282       is_leaveok              window
 283       is_linetouched          window
 284       is_nodelay              window
 285       is_notimeout            window
 286       is_scrollok             window
 287       is_syncok               window
 288       is_term_resized         terminal
 289       is_wintouched           window
 290       isendwin                screen
 291       key_defined             screen
 292       key_name                global (static data)
 293       keybound                screen
 294       keyname                 global (static data)
 295       keyok                   screen
 296       keypad                  window
 297       killchar                terminal
 298       killwchar               terminal
 299       leaveok                 window
 300       longname                screen
 301       mcprint                 terminal
 302       meta                    screen
 303       mouse_trafo             window (stdscr)
 304       mouseinterval           screen
 305       mousemask               screen
 306       move                    window (stdscr)
 307       mvadd_wch               window (stdscr)
 308       mvadd_wchnstr           window (stdscr)
 309       mvadd_wchstr            window (stdscr)
 310       mvaddch                 window (stdscr)
 311       mvaddchnstr             window (stdscr)
 312       mvaddchstr              window (stdscr)
 313       mvaddnstr               window (stdscr)
 314       mvaddnwstr              window (stdscr)
 315       mvaddstr                window (stdscr)
 316       mvaddwstr               window (stdscr)
 317       mvchgat                 window (stdscr)
 318
 319       mvcur                   screen
 320       mvdelch                 window (stdscr)
 321       mvderwin                window (stdscr)
 322       mvget_wch               screen (input-operation)
 323       mvget_wstr              screen (input-operation)
 324       mvgetch                 screen (input-operation)
 325       mvgetn_wstr             screen (input-operation)
 326       mvgetnstr               screen (input-operation)
 327       mvgetstr                screen (input-operation)
 328       mvhline                 window (stdscr)
 329       mvhline_set             window (stdscr)
 330       mvin_wch                window (stdscr)
 331       mvin_wchnstr            window (stdscr)
 332       mvin_wchstr             window (stdscr)
 333       mvinch                  window (stdscr)
 334       mvinchnstr              window (stdscr)
 335       mvinchstr               window (stdscr)
 336       mvinnstr                window (stdscr)
 337       mvinnwstr               window (stdscr)
 338       mvins_nwstr             window (stdscr)
 339       mvins_wch               window (stdscr)
 340       mvins_wstr              window (stdscr)
 341       mvinsch                 window (stdscr)
 342       mvinsnstr               window (stdscr)
 343       mvinsstr                window (stdscr)
 344       mvinstr                 window (stdscr)
 345       mvinwstr                window (stdscr)
 346       mvprintw                window (stdscr)
 347       mvscanw                 screen
 348       mvvline                 window (stdscr)
 349       mvvline_set             window (stdscr)
 350       mvwadd_wch              window
 351       mvwadd_wchnstr          window
 352       mvwadd_wchstr           window
 353       mvwaddch                window
 354       mvwaddchnstr            window
 355       mvwaddchstr             window
 356       mvwaddnstr              window
 357       mvwaddnwstr             window
 358       mvwaddstr               window
 359       mvwaddwstr              window
 360       mvwchgat                window
 361       mvwdelch                window
 362       mvwget_wch              screen (input-operation)
 363       mvwget_wstr             screen (input-operation)
 364       mvwgetch                screen (input-operation)
 365       mvwgetn_wstr            screen (input-operation)
 366       mvwgetnstr              screen (input-operation)
 367       mvwgetstr               screen (input-operation)
 368       mvwhline                window
 369       mvwhline_set            window
 370       mvwin                   window
 371       mvwin_wch               window
 372       mvwin_wchnstr           window
 373       mvwin_wchstr            window
 374       mvwinch                 window
 375       mvwinchnstr             window
 376       mvwinchstr              window
 377       mvwinnstr               window
 378       mvwinnwstr              window
 379       mvwins_nwstr            window
 380       mvwins_wch              window
 381       mvwins_wstr             window
 382       mvwinsch                window
 383       mvwinsnstr              window
 384       mvwinsstr               window
 385
 386       mvwinstr                window
 387       mvwinwstr               window
 388       mvwprintw               window
 389       mvwscanw                screen
 390       mvwvline                window
 391       mvwvline_set            window
 392       napms                   reentrant
 393       newpad                  global locks(windowlist)
 394       newscr                  screen (readonly)
 395       newterm                 global locks(screenlist)
 396       newwin                  global locks(windowlist)
 397       nl                      screen
 398       nocbreak                screen
 399       nodelay                 window
 400       noecho                  screen
 401       nofilter                global
 402       nonl                    screen
 403       noqiflush               terminal
 404       noraw                   screen
 405       notimeout               window
 406       numcodes                global (readonly)
 407       numfnames               global (readonly)
 408       numnames                global (readonly)
 409       ospeed                  global
 410       overlay                 window locks(source, target)
 411       overwrite               window locks(source, target)
 412       pair_content            screen
 413       pecho_wchar             screen
 414       pechochar               screen
 415       pnoutrefresh            screen
 416       prefresh                screen
 417       printw                  window
 418       putp                    global
 419       putwin                  window
 420       qiflush                 terminal
 421       raw                     screen
 422       redrawwin               window
 423       refresh                 screen
 424       reset_prog_mode         screen
 425       reset_shell_mode        screen
 426       resetty                 terminal
 427       resize_term             screen locks(windowlist)
 428       resizeterm              screen
 429       restartterm             screen
 430       ripoffline              global (static data)
 431       savetty                 terminal
 432       scanw                   screen
 433       scr_dump                screen
 434       scr_init                screen
 435       scr_restore             screen
 436       scr_set                 screen
 437       scrl                    window (stdscr)
 438       scroll                  window
 439       scrollok                window
 440       set_curterm             screen
 441       set_escdelay            screen
 442       set_tabsize             screen
 443       set_term                global locks(screenlist, screen)
 444       setcchar                reentrant
 445       setscrreg               window (stdscr)
 446       setupterm               global
 447       slk_attr                screen
 448       slk_attr_off            screen
 449       slk_attr_on             screen
 450       slk_attr_set            screen
 451       slk_attroff             screen
 452
 453       slk_attron              screen
 454       slk_attrset             screen
 455       slk_clear               screen
 456       slk_color               screen
 457       slk_init                screen
 458       slk_label               screen
 459       slk_noutrefresh         screen
 460       slk_refresh             screen
 461       slk_restore             screen
 462       slk_set                 screen
 463       slk_touch               screen
 464       slk_wset                screen
 465       standend                window
 466       standout                window
 467       start_color             screen
 468       stdscr                  screen (readonly)
 469       strcodes                global (readonly)
 470       strfnames               global (readonly)
 471       strnames                global (readonly)
 472       subpad                  window
 473       subwin                  window
 474       syncok                  window
 475       term_attrs              screen
 476       termattrs               screen
 477       termname                terminal
 478       tgetent                 global
 479       tgetflag                global
 480       tgetnum                 global
 481       tgetstr                 global
 482       tgoto                   global
 483       tigetflag               terminal
 484       tigetnum                terminal
 485       tigetstr                terminal
 486       timeout                 window (stdscr)
 487       touchline               window
 488       touchwin                window
 489       tparm                   global (static data)
 490       tputs                   screen
 491       trace                   global (static data)
 492       ttytype                 screen (readonly)
 493       typeahead               screen
 494       unctrl                  screen
 495       unget_wch               screen (input-operation)
 496       ungetch                 screen (input-operation)
 497       ungetmouse              screen (input-operation)
 498       untouchwin              window
 499       use_default_colors      screen
 500       use_env                 global (static data)
 501       use_extended_names      global (static data)
 502       use_legacy_coding       screen
 503       use_screen              global locks(screenlist, screen)
 504       use_window              global locks(windowlist, window)
 505       vid_attr                screen
 506       vid_puts                screen
 507       vidattr                 screen
 508       vidputs                 screen
 509       vline                   window (stdscr)
 510       vline_set               window (stdscr)
 511       vw_printw               window
 512       vw_scanw                screen
 513       vwprintw                window
 514       vwscanw                 screen
 515       wadd_wch                window
 516       wadd_wchnstr            window
 517       wadd_wchstr             window
 518       waddch                  window
 519
 520       waddchnstr              window
 521       waddchstr               window
 522       waddnstr                window
 523       waddnwstr               window
 524       waddstr                 window
 525       waddwstr                window
 526       wattr_get               window
 527       wattr_off               window
 528       wattr_on                window
 529       wattr_set               window
 530       wattroff                window
 531       wattron                 window
 532       wattrset                window
 533       wbkgd                   window
 534       wbkgdset                window
 535       wbkgrnd                 window
 536       wbkgrndset              window
 537       wborder                 window
 538       wborder_set             window
 539       wchgat                  window
 540       wclear                  window
 541       wclrtobot               window
 542       wclrtoeol               window
 543       wcolor_set              window
 544       wcursyncup              screen (affects window plus parents)
 545       wdelch                  window
 546       wdeleteln               window
 547       wecho_wchar             window
 548       wechochar               window
 549       wenclose                window
 550       werase                  window
 551       wget_wch                screen (input-operation)
 552       wget_wstr               screen (input-operation)
 553       wgetbkgrnd              window
 554       wgetch                  screen (input-operation)
 555       wgetn_wstr              screen (input-operation)
 556       wgetnstr                screen (input-operation)
 557       wgetparent              window
 558       wgetscrreg              window
 559       wgetstr                 screen (input-operation)
 560       whline                  window
 561       whline_set              window
 562       win_wch                 window
 563       win_wchnstr             window
 564       win_wchstr              window
 565       winch                   window
 566       winchnstr               window
 567       winchstr                window
 568       winnstr                 window
 569       winnwstr                window
 570       wins_nwstr              window
 571       wins_wch                window
 572       wins_wstr               window
 573       winsch                  window
 574       winsdelln               window
 575       winsertln               window
 576       winsnstr                window
 577       winsstr                 window
 578       winstr                  window
 579       winwstr                 window
 580       wmouse_trafo            window
 581       wmove                   window
 582       wnoutrefresh            screen
 583       wprintw                 window
 584       wredrawln               window
 585       wrefresh                screen
 586
 587       wresize                 window locks(windowlist)
 588       wscanw                  screen
 589       wscrl                   window
 590       wsetscrreg              window
 591       wstandend               window
 592       wstandout               window
 593       wsyncdown               screen (affects window plus parents)
 594       wsyncup                 screen (affects window plus parents)
 595       wtimeout                window
 596       wtouchln                window
 597       wunctrl                 global (static data)
 598       wvline                  window
 599       wvline_set              window
 600
 601
 602 </PRE>
 603 <H2>RETURN VALUE</H2><PRE>
 604        These functions all return TRUE or FALSE, except as noted.
 605
 606
 607 </PRE>
 608 <H2>NOTES</H2><PRE>
 609        Both a macro and a function are provided for each name.
 610
 611
 612 </PRE>
 613 <H2>PORTABILITY</H2><PRE>
 614        These  routines  are  specific  to ncurses.  They were not
 615        supported on Version 7, BSD or System  V  implementations.
 616        It  is  recommended that any code depending on ncurses ex-
 617        tensions be conditioned using NCURSES_VERSION.
 618
 619
 620 </PRE>
 621 <H2>SEE ALSO</H2><PRE>
 622        <STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>, <STRONG><A HREF="curs_opaque.3x.html">curs_opaque(3x)</A></STRONG>, <STRONG><A HREF="curs_variables.3x.html">curs_variables(3x)</A></STRONG>.
 623
 624
 625
 626                                                        <STRONG><A HREF="curs_threads.3x.html">curs_threads(3x)</A></STRONG>
 627 </PRE>
 628 <HR>
 629 <ADDRESS>
 630 Man(1) output converted with
 631 <a href="http://www.oac.uci.edu/indiv/ehood/man2html.html">man2html</a>
 632 </ADDRESS>
 633 </BODY>
 634 </HTML>