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Groups > pl.comp.os.linux.programowanie > #2037

Niskopoziomowy timer

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Chciałem użyć biblioteki XCB jako nowszej niż Xlib. Mam przykład z 
http://xcb.freedesktop.org/tutorial/fonts/ który wyświetla tylko tekst w 
oknie. Teraz chciałem podłączyć timer czy dwa, które w callbacku 
zmieniają ten tekst.
Używam timer_create(CLOCK_REALTIME, &sigev, &tid) który łączy sygnały z 
timerem.
Jednak nic się  nie dzieje.
Kompilacja: w Code::Blocks nie trzeba ustawiać ścieżek, tylko dodać 
biblioteki linkera: xcb i rt.

Oto moja próba:
--------------------------------------------------------
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <inttypes.h>


#include <xcb/xcb.h>
#include <signal.h>
#include <time.h>

#define WIDTH 300
#define HEIGHT 100


static xcb_gcontext_t getFontGC (xcb_connection_t *c,
                              xcb_screen_t     *screen,
                              xcb_window_t      window,
                              const char       *font_name );


static void drawText (xcb_connection_t *c,
                        xcb_screen_t     *screen,
                        xcb_window_t      window,
                        int16_t           x1,
                        int16_t           y1,
                        const char       *label );


static void
testCookie (xcb_void_cookie_t cookie,
             xcb_connection_t *connection,
             char *errMessage )
{
     xcb_generic_error_t *error = xcb_request_check (connection, cookie);
     if (error) {
         fprintf (stderr, "ERROR: %s : %"PRIu8"\n", errMessage , 
error->error_code);
         xcb_disconnect (connection);
         exit (-1);
     }
}

static void
drawText (xcb_connection_t  *connection,
            xcb_screen_t     *screen,
            xcb_window_t      window,
            int16_t           x1,
            int16_t           y1,
            const char       *label )
{

     /* get graphics context */
     xcb_gcontext_t gc = getFontGC (connection, screen, window, "fixed");


     /* draw the text */
     xcb_void_cookie_t textCookie = xcb_image_text_8_checked (connection,
                                                              strlen 
(label),
                                                              window,
                                                              gc,
                                                              x1, y1,
                                                              label );

     testCookie(textCookie, connection, "can't paste text");


     /* free the gc */
     xcb_void_cookie_t gcCookie = xcb_free_gc (connection, gc);

     testCookie(gcCookie, connection, "can't free gc");
}


static xcb_gcontext_t
getFontGC (xcb_connection_t  *connection,
            xcb_screen_t      *screen,
            xcb_window_t       window,
            const char        *font_name )
{
     /* get font */
     xcb_font_t font = xcb_generate_id (connection);
     xcb_void_cookie_t fontCookie = xcb_open_font_checked (connection,
                                                           font,
                                                           strlen 
(font_name),
                                                           font_name );

     testCookie(fontCookie, connection, "can't open font");


     /* create graphics context */
     xcb_gcontext_t  gc            = xcb_generate_id (connection);
     uint32_t        mask          = XCB_GC_FOREGROUND | 
XCB_GC_BACKGROUND | XCB_GC_FONT;
     uint32_t        value_list[3] = { screen->black_pixel,
                                       screen->white_pixel,
                                       font };

     xcb_void_cookie_t gcCookie = xcb_create_gc_checked (connection,
                                                         gc,
                                                         window,
                                                         mask,
                                                         value_list );

     testCookie(gcCookie, connection, "can't create gc");


     /* close font */
     fontCookie = xcb_close_font_checked (connection, font);

     testCookie(fontCookie, connection, "can't close font");

     return gc;
}

char *text_message = "abcdef";
#define SIGTIMER (SIGRTMAX)
#define SIG SIGUSR1

static timer_t     tid1;
static timer_t     tid2;

void SignalHandler(int signo, siginfo_t* info, void* context)
{
     if (signo == SIGTIMER) {
         text_message = "parameter frequency";

     }
     else if (signo == SIG) {
         text_message = "Communication frequency";

     }
}

timer_t SetTimer(int signo, long int sec, int mode)
{
static struct sigevent sigev;
static timer_t tid;
static struct itimerspec itval;
static struct itimerspec oitval;

// Create the POSIX timer to generate signo
sigev.sigev_notify = SIGEV_SIGNAL;
sigev.sigev_signo = signo;
sigev.sigev_value.sival_ptr = &tid;


if (timer_create(CLOCK_REALTIME, &sigev, &tid) == 0) {
     itval.it_value.tv_sec = sec;
     itval.it_value.tv_nsec = 0;

     if (mode == 1) {
         itval.it_interval.tv_sec = sec;
         itval.it_interval.tv_nsec = 0;
     }
else {
     itval.it_interval.tv_sec = sec;
         itval.it_interval.tv_nsec = 0;
     }

     if (timer_settime(tid, 0, &itval, &oitval) != 0) {
         perror("time_settime error!");
     }
}
else {
     perror("timer_create error!");
     return NULL;
}
return tid;
}

int main ()
{
     /* get the connection */
     int screenNum;
     xcb_connection_t *connection = xcb_connect (NULL, &screenNum);
     if (!connection) {
         fprintf (stderr, "ERROR: can't connect to an X server\n");
         return -1;
     }


     /* get the current screen */
     xcb_screen_iterator_t iter = xcb_setup_roots_iterator 
(xcb_get_setup (connection));

     // we want the screen at index screenNum of the iterator
     for (int i = 0; i < screenNum; ++i) {
         xcb_screen_next (&iter);
     }

     xcb_screen_t *screen = iter.data;

     if (!screen) {
         fprintf (stderr, "ERROR: can't get the current screen\n");
         xcb_disconnect (connection);
         return -1;
     }


     /* create the window */
     xcb_window_t window = xcb_generate_id (connection);

     uint32_t mask = XCB_CW_BACK_PIXEL | XCB_CW_EVENT_MASK;
     uint32_t values[2];
     values[0] = screen->white_pixel;
     values[1] = XCB_EVENT_MASK_KEY_RELEASE |
                 XCB_EVENT_MASK_BUTTON_PRESS |
                 XCB_EVENT_MASK_EXPOSURE |
                 XCB_EVENT_MASK_POINTER_MOTION;

     xcb_void_cookie_t windowCookie = xcb_create_window_checked (connection,
 
screen->root_depth,
                                                                 window, 
screen->root,
                                                                 20, 200,
                                                                 WIDTH, 
HEIGHT,
                                                                 0, 
XCB_WINDOW_CLASS_INPUT_OUTPUT,
 
screen->root_visual,
                                                                 mask, 
values);

     testCookie(windowCookie, connection, "can't create window");

     xcb_void_cookie_t mapCookie = xcb_map_window_checked (connection, 
window);

     testCookie(mapCookie, connection, "can't map window");

     xcb_flush(connection);  // make sure window is drawn



     /* event loop */
     xcb_generic_event_t  *event;
                             /* event loop */
   int done = 0;


     struct sigaction sigact;
     sigemptyset(&sigact.sa_mask);
     sigact.sa_flags = SA_SIGINFO;
     sigact.sa_sigaction = SignalHandler;
     // set up sigaction to catch signal
     if (sigaction(SIGTIMER, &sigact, NULL) == -1)
     {
         perror("sigaction failed");
         exit( EXIT_FAILURE );
     }

     int  param_delay = 2;
     tid1=SetTimer(SIGTIMER, param_delay, 1);

     struct sigaction sa;
     sigemptyset(&sa.sa_mask);
     sa.sa_flags = SA_SIGINFO;
     sa.sa_sigaction = SignalHandler;
     // set up sigaction to catch signal
     if (sigaction(SIG, &sa, NULL) == -1)
     {
         perror("sa failed");
         exit( EXIT_FAILURE );
     }

int commn_delay = 1;
     tid2=SetTimer(SIG, commn_delay, 1);


   while (!done && (event = xcb_wait_for_event(connection))) {
     switch (event->response_type & ~0x80) {
     case XCB_EXPOSE:    /* draw or redraw the window */
       drawText (connection,
                               screen,
                               window,
                               10, HEIGHT - 10,
                               text_message );
       xcb_flush(connection);
       break;
     case XCB_KEY_RELEASE:  /* exit on key press */
       done = 1;
       break;
     }
     free(event);
   }
                         /* close connection to server */
   xcb_disconnect(connection);

   return 0;
}

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Niskopoziomowy timer Borneq <borneq@antyspam.hidden.pl> - 2015-11-26 11:41 +0100
  Re: Niskopoziomowy timer Borneq <borneq@antyspam.hidden.pl> - 2015-11-26 12:06 +0100
    Re: Niskopoziomowy timer Borneq <borneq@antyspam.hidden.pl> - 2015-11-26 12:10 +0100
      Re: Niskopoziomowy timer Borneq <borneq@antyspam.hidden.pl> - 2015-11-26 17:38 +0100

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