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tetex-bin  3.0
Defines | Functions
lib_twait.c File Reference
#include <curses.priv.h>

Go to the source code of this file.

Defines

#define PRECISE_GETTIME   0

Functions

static long _nc_gettime (bool first)
 _nc_timed_wait (int mode, int milliseconds, int *timeleft EVENTLIST_2nd(_nc_eventlist *evl))

Define Documentation

#define PRECISE_GETTIME   0

Function Documentation

static long _nc_gettime ( bool  first) [static]

Definition at line 67 of file lib_twait.c.

{
    long res;

#if HAVE_GETTIMEOFDAY
# define PRECISE_GETTIME 1
    static struct timeval t0;
    struct timeval t1;
    gettimeofday(&t1, (struct timezone *) 0);
    if (first) {
       t0 = t1;
       res = 0;
    } else {
       /* .tv_sec and .tv_usec are unsigned, be careful when subtracting */
       if (t0.tv_usec > t1.tv_usec) {     /* Convert 1s in 1e6 microsecs */
           t1.tv_usec += 1000000;
           t1.tv_sec--;
       }
       res = (t1.tv_sec - t0.tv_sec) * 1000
           + (t1.tv_usec - t0.tv_usec) / 1000;
    }
#else
# define PRECISE_GETTIME 0
    static time_t t0;
    time_t t1 = time((time_t *) 0);
    if (first) {
       t0 = t1;
    }
    res = (t1 - t0) * 1000;
#endif
    TR(TRACE_IEVENT, ("%s time: %ld msec", first ? "get" : "elapsed", res));
    return res;
}

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_nc_timed_wait ( int  mode,
int  milliseconds,
int *timeleft   EVENTLIST_2nd_nc_eventlist *evl 
)

Definition at line 144 of file lib_twait.c.

{
    int fd;
    int count;
    int result;

#ifdef NCURSES_WGETCH_EVENTS
    int timeout_is_event = 0;
#endif

#if USE_FUNC_POLL
    struct pollfd fd_list[2];
    struct pollfd *fds = fd_list;
#elif defined(__BEOS__)
#elif HAVE_SELECT
    static fd_set set;
#endif

    long starttime, returntime;

    TR(TRACE_IEVENT, ("start twait: %d milliseconds, mode: %d",
                    milliseconds, mode));

#ifdef NCURSES_WGETCH_EVENTS
    if (mode & 4) {
       int event_delay = _nc_eventlist_timeout(evl);

       if (event_delay >= 0
           && (milliseconds >= event_delay || milliseconds < 0)) {
           milliseconds = event_delay;
           timeout_is_event = 1;
       }
    }
#endif

#if PRECISE_GETTIME
  retry:
#endif
    starttime = _nc_gettime(TRUE);

    count = 0;

#ifdef NCURSES_WGETCH_EVENTS
    if ((mode & 4) && evl)
       evl->result_flags = 0;
#endif

#if USE_FUNC_POLL
    memset(fd_list, 0, sizeof(fd_list));

#ifdef NCURSES_WGETCH_EVENTS
    if ((mode & 4) && evl)
       fds = typeMalloc(struct pollfd, 2 + evl->count);
#endif

    if (mode & 1) {
       fds[count].fd = SP->_ifd;
       fds[count].events = POLLIN;
       count++;
    }
    if ((mode & 2)
       && (fd = SP->_mouse_fd) >= 0) {
       fds[count].fd = fd;
       fds[count].events = POLLIN;
       count++;
    }
#ifdef NCURSES_WGETCH_EVENTS
    if ((mode & 4) && evl) {
       _nc_event **ev = evl->events;
       _nc_event **last = ev + evl->count;

       while (ev < last) {
           if ((*ev)->type == _NC_EVENT_FILE
              && ((*ev)->data.fev.flags & _NC_EVENT_FILE_READABLE)) {
              fds[count].fd = (*ev)->data.fev.fd;
              fds[count].events = POLLIN;
              count++;
           }
       }
    }
#endif

    result = poll(fds, (unsigned) count, milliseconds);

#ifdef NCURSES_WGETCH_EVENTS
    if ((mode & 4) && evl) {
       _nc_event **ev = evl->events;
       _nc_event **last = ev + evl->count;
       int c;

       if (!result)
           count = 0;
       while (ev < last) {
           if ((*ev)->type == _NC_EVENT_FILE
              && ((*ev)->data.fev.flags & _NC_EVENT_FILE_READABLE)) {
              (*ev)->data.fev.result = 0;
              for (c = 0; c < count; c++)
                  if (fds[c].fd == (*ev)->data.fev.fd
                     && fds[c].revents & POLLIN) {
                     (*ev)->data.fev.result |= _NC_EVENT_FILE_READABLE;
                     evl->result_flags |= _NC_EVENT_FILE_READABLE;
                  }
           } else if ((*ev)->type == _NC_EVENT_TIMEOUT_MSEC
                     && !result && timeout_is_event) {
              evl->result_flags |= _NC_EVENT_TIMEOUT_MSEC;
           }
       }
    }

    if (fds != fd_list)
       free((char *) fds);

#endif

#elif defined(__BEOS__)
    /*
     * BeOS's select() is declared in socket.h, so the configure script does
     * not see it.  That's just as well, since that function works only for
     * sockets.  This (using snooze and ioctl) was distilled from Be's patch
     * for ncurses which uses a separate thread to simulate select().
     *
     * FIXME: the return values from the ioctl aren't very clear if we get
     * interrupted.
     *
     * FIXME: this assumes mode&1 if milliseconds < 0 (see lib_getch.c).
     */
    result = 0;
    if (mode & 1) {
       int step = (milliseconds < 0) ? 0 : 5000;
       bigtime_t d;
       bigtime_t useconds = milliseconds * 1000;
       int n, howmany;

       if (useconds <= 0)   /* we're here to go _through_ the loop */
           useconds = 1;

       for (d = 0; d < useconds; d += step) {
           n = 0;
           howmany = ioctl(0, 'ichr', &n);
           if (howmany >= 0 && n > 0) {
              result = 1;
              break;
           }
           if (useconds > 1 && step > 0) {
              snooze(step);
              milliseconds -= (step / 1000);
              if (milliseconds <= 0) {
                  milliseconds = 0;
                  break;
              }
           }
       }
    } else if (milliseconds > 0) {
       snooze(milliseconds * 1000);
       milliseconds = 0;
    }
#elif HAVE_SELECT
    /*
     * select() modifies the fd_set arguments; do this in the
     * loop.
     */
    FD_ZERO(&set);

    if (mode & 1) {
       FD_SET(SP->_ifd, &set);
       count = SP->_ifd + 1;
    }
    if ((mode & 2)
       && (fd = SP->_mouse_fd) >= 0) {
       FD_SET(fd, &set);
       count = max(fd, count) + 1;
    }
#ifdef NCURSES_WGETCH_EVENTS
    if ((mode & 4) && evl) {
       _nc_event **ev = evl->events;
       _nc_event **last = ev + evl->count;

       while (ev < last) {
           if ((*ev)->type == _NC_EVENT_FILE
              && ((*ev)->data.fev.flags & _NC_EVENT_FILE_READABLE)) {
              FD_SET((*ev)->data.fev.fd, &set);
              count = max((*ev)->data.fev.fd + 1, count);
           }
       }
    }
#endif

    if (milliseconds >= 0) {
       struct timeval ntimeout;
       ntimeout.tv_sec = milliseconds / 1000;
       ntimeout.tv_usec = (milliseconds % 1000) * 1000;
       result = select(count, &set, NULL, NULL, &ntimeout);
    } else {
       result = select(count, &set, NULL, NULL, NULL);
    }

#ifdef NCURSES_WGETCH_EVENTS
    if ((mode & 4) && evl) {
       _nc_event **ev = evl->events;
       _nc_event **last = ev + evl->count;

       evl->result_flags = 0;
       while (ev < last) {
           if ((*ev)->type == _NC_EVENT_FILE
              && ((*ev)->data.fev.flags & _NC_EVENT_FILE_READABLE)) {
              (*ev)->data.fev.result = 0;
              if (FD_ISSET((*ev)->data.fev.fd, &set)) {
                  (*ev)->data.fev.result |= _NC_EVENT_FILE_READABLE;
                  evl->result_flags |= _NC_EVENT_FILE_READABLE;
              }
           } else if ((*ev)->type == _NC_EVENT_TIMEOUT_MSEC
                     && !result && timeout_is_event)
              evl->result_flags |= _NC_EVENT_TIMEOUT_MSEC;
       }
    }
#endif

#endif /* USE_FUNC_POLL, etc */

    returntime = _nc_gettime(FALSE);

    if (milliseconds >= 0)
       milliseconds -= (returntime - starttime);

#ifdef NCURSES_WGETCH_EVENTS
    if (evl) {
       _nc_event **ev = evl->events;
       _nc_event **last = ev + evl->count;

       evl->result_flags = 0;
       while (ev < last) {
           if ((*ev)->type == _NC_EVENT_TIMEOUT_MSEC) {
              long diff = (returntime - starttime);
              if ((*ev)->data.timeout_msec <= diff)
                  (*ev)->data.timeout_msec = 0;
              else
                  (*ev)->data.timeout_msec -= diff;
           }

       }
    }
#endif

#if PRECISE_GETTIME && HAVE_NANOSLEEP
    /*
     * If the timeout hasn't expired, and we've gotten no data,
     * this is probably a system where 'select()' needs to be left
     * alone so that it can complete.  Make this process sleep,
     * then come back for more.
     */
    if (result == 0 && milliseconds > 100) {
       napms(100);          /* FIXME: this won't be right if I recur! */
       milliseconds -= 100;
       goto retry;
    }
#endif

    /* return approximate time left in milliseconds */
    if (timeleft)
       *timeleft = milliseconds;

    TR(TRACE_IEVENT, ("end twait: returned %d (%d), remaining time %d msec",
                    result, errno, milliseconds));

    /*
     * Both 'poll()' and 'select()' return the number of file descriptors
     * that are active.  Translate this back to the mask that denotes which
     * file-descriptors, so that we don't need all of this system-specific
     * code everywhere.
     */
    if (result != 0) {
       if (result > 0) {
           result = 0;
#if USE_FUNC_POLL
           for (count = 0; count < 2; count++) {
              if ((mode & (1 << count))
                  && (fds[count].revents & POLLIN)) {
                  result |= (1 << count);
              }
           }
#elif defined(__BEOS__)
           result = 1;             /* redundant, but simple */
#elif HAVE_SELECT
           if ((mode & 2)
              && (fd = SP->_mouse_fd) >= 0
              && FD_ISSET(fd, &set))
              result |= 2;
           if ((mode & 1)
              && FD_ISSET(SP->_ifd, &set))
              result |= 1;
#endif
       } else
           result = 0;
    }
#ifdef NCURSES_WGETCH_EVENTS
    if ((mode & 4) && evl && evl->result_flags)
       result |= 4;
#endif

    return (result);
}

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