*** empty log message ***

[software/libev.git] / ev.c

diff --git a/ev.c b/ev.c
index 260787d46dc3fe4f63f0bef6d110c2672a019901..acde504b11cc52579943aafa3605525ea6a164d3 100644 (file)
--- a/ev.c
+++ b/ev.c
@@ -218,29 +218,40 @@ extern "C" {
 
 /**/
 
 
 /**/
 

+/*
+ * This is used to avoid floating point rounding problems.
+ * It is added to ev_rt_now when scheduling periodics
+ * to ensure progress, time-wise, even when rounding
+ * errors are against us.
+ * This value is good at least till the year 4000.
+ * Better solutions welcome.
+ */
+#define TIME_EPSILON  0.0001220703125 /* 1/8192 */
+

 #define MIN_TIMEJUMP  1. /* minimum timejump that gets detected (if monotonic clock available) */
 #define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
 #define MIN_TIMEJUMP  1. /* minimum timejump that gets detected (if monotonic clock available) */
 #define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */

-/*#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds */
+/*#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds, TODO */

 
 #if __GNUC__ >= 3
 # define expect(expr,value)         __builtin_expect ((expr),(value))
 
 #if __GNUC__ >= 3
 # define expect(expr,value)         __builtin_expect ((expr),(value))

-# define inline_size                static inline /* inline for codesize */
-# if EV_MINIMAL
-#  define noinline                  __attribute__ ((noinline))
-#  define inline_speed              static noinline
-# else
-#  define noinline
-#  define inline_speed              static inline
-# endif
+# define noinline                   __attribute__ ((noinline))

 #else
 # define expect(expr,value)         (expr)
 #else
 # define expect(expr,value)         (expr)

-# define inline_speed               static
-# define inline_size                static

 # define noinline
 # define noinline

+# if __STDC_VERSION__ < 199901L
+#  define inline
+# endif

 #endif
 
 #define expect_false(expr) expect ((expr) != 0, 0)
 #define expect_true(expr)  expect ((expr) != 0, 1)
 #endif
 
 #define expect_false(expr) expect ((expr) != 0, 0)
 #define expect_true(expr)  expect ((expr) != 0, 1)

+#define inline_size        static inline
+
+#if EV_MINIMAL
+# define inline_speed      static noinline
+#else
+# define inline_speed      static inline
+#endif

 
 #define NUMPRI    (EV_MAXPRI - EV_MINPRI + 1)
 #define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
 
 #define NUMPRI    (EV_MAXPRI - EV_MINPRI + 1)
 #define ABSPRI(w) (((W)w)->priority - EV_MINPRI)


@@ -419,7 +430,7 @@ array_nextsize (int elem, int cur, int cnt)
   return ncur;
 }
 
   return ncur;
 }
 

-inline_speed void *
+static noinline void *

 array_realloc (int elem, void *base, int *cur, int cnt)
 {
   *cur = array_nextsize (elem, *cur, cnt);
 array_realloc (int elem, void *base, int *cur, int cnt)
 {
   *cur = array_nextsize (elem, *cur, cnt);


@@ -454,17 +465,17 @@ void noinline
 ev_feed_event (EV_P_ void *w, int revents)
 {
   W w_ = (W)w;
 ev_feed_event (EV_P_ void *w, int revents)
 {
   W w_ = (W)w;

+  int pri = ABSPRI (w_);

 
   if (expect_false (w_->pending))
 
   if (expect_false (w_->pending))

+    pendings [pri][w_->pending - 1].events |= revents;
+  else

     {
     {

-      pendings [ABSPRI (w_)][w_->pending - 1].events |= revents;
-      return;
+      w_->pending = ++pendingcnt [pri];
+      array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
+      pendings [pri][w_->pending - 1].w      = w_;
+      pendings [pri][w_->pending - 1].events = revents;

     }
     }

-
-  w_->pending = ++pendingcnt [ABSPRI (w_)];
-  array_needsize (ANPENDING, pendings [ABSPRI (w_)], pendingmax [ABSPRI (w_)], pendingcnt [ABSPRI (w_)], EMPTY2);
-  pendings [ABSPRI (w_)][w_->pending - 1].w      = w_;
-  pendings [ABSPRI (w_)][w_->pending - 1].events = revents;

 }
 
 void inline_size
 }
 
 void inline_size


@@ -509,7 +520,8 @@ fd_event (EV_P_ int fd, int revents)
 void
 ev_feed_fd_event (EV_P_ int fd, int revents)
 {
 void
 ev_feed_fd_event (EV_P_ int fd, int revents)
 {

-  fd_event (EV_A_ fd, revents);
+  if (fd >= 0 && fd < anfdmax)
+    fd_event (EV_A_ fd, revents);

 }
 
 void inline_size
 }
 
 void inline_size


@@ -749,7 +761,7 @@ sigcb (EV_P_ ev_io *iow, int revents)
       ev_feed_signal_event (EV_A_ signum + 1);
 }
 
       ev_feed_signal_event (EV_A_ signum + 1);
 }
 

-void inline_size
+void inline_speed

 fd_intern (int fd)
 {
 #ifdef _WIN32
 fd_intern (int fd)
 {
 #ifdef _WIN32


@@ -1165,6 +1177,12 @@ ev_default_fork (void)
 
 /*****************************************************************************/
 
 
 /*****************************************************************************/
 

+void
+ev_invoke (EV_P_ void *w, int revents)
+{
+  EV_CB_INVOKE ((W)w, revents);
+}
+

 void inline_speed
 call_pending (EV_P)
 {
 void inline_speed
 call_pending (EV_P)
 {


@@ -1225,13 +1243,14 @@ periodics_reify (EV_P)
       /* first reschedule or stop timer */
       if (w->reschedule_cb)
         {
       /* first reschedule or stop timer */
       if (w->reschedule_cb)
         {

-          ((WT)w)->at = w->reschedule_cb (w, ev_rt_now + 0.0001);
+          ((WT)w)->at = w->reschedule_cb (w, ev_rt_now + TIME_EPSILON);

           assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
           downheap ((WT *)periodics, periodiccnt, 0);
         }
       else if (w->interval)
         {
           assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
           downheap ((WT *)periodics, periodiccnt, 0);
         }
       else if (w->interval)
         {

-          ((WT)w)->at += floor ((ev_rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
+          ((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
+          if (((WT)w)->at - ev_rt_now <= TIME_EPSILON) ((WT)w)->at += w->interval;

           assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
           downheap ((WT *)periodics, periodiccnt, 0);
         }
           assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
           downheap ((WT *)periodics, periodiccnt, 0);
         }


@@ -1255,7 +1274,7 @@ periodics_reschedule (EV_P)
       if (w->reschedule_cb)
         ((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
       else if (w->interval)
       if (w->reschedule_cb)
         ((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
       else if (w->interval)

-        ((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
+        ((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;

     }
 
   /* now rebuild the heap */
     }
 
   /* now rebuild the heap */


@@ -1287,74 +1306,65 @@ idle_reify (EV_P)
 }
 #endif
 
 }
 #endif
 

-int inline_size
-time_update_monotonic (EV_P)
-{
-  mn_now = get_clock ();
-
-  if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
-    {
-      ev_rt_now = rtmn_diff + mn_now;
-      return 0;
-    }
-  else
-    {
-      now_floor = mn_now;
-      ev_rt_now = ev_time ();
-      return 1;
-    }
-}
-
-void inline_size
-time_update (EV_P)
+void inline_speed
+time_update (EV_P_ ev_tstamp max_block)

 {
   int i;
 
 #if EV_USE_MONOTONIC
   if (expect_true (have_monotonic))
     {
 {
   int i;
 
 #if EV_USE_MONOTONIC
   if (expect_true (have_monotonic))
     {

-      if (time_update_monotonic (EV_A))
+      ev_tstamp odiff = rtmn_diff;
+
+      mn_now = get_clock ();
+
+      /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
+      /* interpolate in the meantime */
+      if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))

         {
         {

-          ev_tstamp odiff = rtmn_diff;
-
-          /* loop a few times, before making important decisions.
-           * on the choice of "4": one iteration isn't enough,
-           * in case we get preempted during the calls to
-           * ev_time and get_clock. a second call is almost guaranteed
-           * to succeed in that case, though. and looping a few more times
-           * doesn't hurt either as we only do this on time-jumps or
-           * in the unlikely event of having been preempted here.
-           */
-          for (i = 4; --i; )
-            {
-              rtmn_diff = ev_rt_now - mn_now;
+          ev_rt_now = rtmn_diff + mn_now;
+          return;
+        }
+
+      now_floor = mn_now;
+      ev_rt_now = ev_time ();
+
+      /* loop a few times, before making important decisions.
+       * on the choice of "4": one iteration isn't enough,
+       * in case we get preempted during the calls to
+       * ev_time and get_clock. a second call is almost guaranteed
+       * to succeed in that case, though. and looping a few more times
+       * doesn't hurt either as we only do this on time-jumps or
+       * in the unlikely event of having been preempted here.
+       */
+      for (i = 4; --i; )
+        {
+          rtmn_diff = ev_rt_now - mn_now;

 
 

-              if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
-                return; /* all is well */
+          if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
+            return; /* all is well */

 
 

-              ev_rt_now = ev_time ();
-              mn_now    = get_clock ();
-              now_floor = mn_now;
-            }
+          ev_rt_now = ev_time ();
+          mn_now    = get_clock ();
+          now_floor = mn_now;
+        }

 
 # if EV_PERIODIC_ENABLE
 
 # if EV_PERIODIC_ENABLE

-          periodics_reschedule (EV_A);
+      periodics_reschedule (EV_A);

 # endif
 # endif

-          /* no timer adjustment, as the monotonic clock doesn't jump */
-          /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
-        }
+      /* no timer adjustment, as the monotonic clock doesn't jump */
+      /* timers_reschedule (EV_A_ rtmn_diff - odiff) */

     }
   else
 #endif
     {
       ev_rt_now = ev_time ();
 
     }
   else
 #endif
     {
       ev_rt_now = ev_time ();
 

-      if (expect_false (mn_now > ev_rt_now || mn_now < ev_rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
+      if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))

         {
 #if EV_PERIODIC_ENABLE
           periodics_reschedule (EV_A);
 #endif
         {
 #if EV_PERIODIC_ENABLE
           periodics_reschedule (EV_A);
 #endif

-

           /* adjust timers. this is easy, as the offset is the same for all of them */
           for (i = 0; i < timercnt; ++i)
             ((WT)timers [i])->at += ev_rt_now - mn_now;
           /* adjust timers. this is easy, as the offset is the same for all of them */
           for (i = 0; i < timercnt; ++i)
             ((WT)timers [i])->at += ev_rt_now - mn_now;


@@ -1408,7 +1418,7 @@ ev_loop (EV_P_ int flags)
           }
 #endif
 
           }
 #endif
 

-      /* queue check watchers (and execute them) */
+      /* queue prepare watchers (and execute them) */

       if (expect_false (preparecnt))
         {
           queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
       if (expect_false (preparecnt))
         {
           queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);


@@ -1434,15 +1444,7 @@ ev_loop (EV_P_ int flags)
         else
           {
             /* update time to cancel out callback processing overhead */
         else
           {
             /* update time to cancel out callback processing overhead */

-#if EV_USE_MONOTONIC
-            if (expect_true (have_monotonic))
-              time_update_monotonic (EV_A);
-            else
-#endif
-              {
-                ev_rt_now = ev_time ();
-                mn_now    = ev_rt_now;
-              }
+            time_update (EV_A_ 1e100);

 
             block = MAX_BLOCKTIME;
 
 
             block = MAX_BLOCKTIME;
 


@@ -1465,10 +1467,10 @@ ev_loop (EV_P_ int flags)
 
         ++loop_count;
         backend_poll (EV_A_ block);
 
         ++loop_count;
         backend_poll (EV_A_ block);

-      }

 
 

-      /* update ev_rt_now, do magic */
-      time_update (EV_A);
+        /* update ev_rt_now, do magic */
+        time_update (EV_A_ block);
+      }

 
       /* queue pending timers and reschedule them */
       timers_reify (EV_A); /* relative timers called last */
 
       /* queue pending timers and reschedule them */
       timers_reify (EV_A); /* relative timers called last */


@@ -1540,14 +1542,15 @@ ev_clear_pending (EV_P_ void *w)
   W w_ = (W)w;
   int pending = w_->pending;
 
   W w_ = (W)w;
   int pending = w_->pending;
 

-  if (!pending)
+  if (expect_true (pending))
+    {
+      ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
+      w_->pending = 0;
+      p->w = 0;
+      return p->events;
+    }
+  else

     return 0;
     return 0;

-
-  w_->pending = 0;
-  ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
-  p->w = 0;
-
-  return p->events;

 }
 
 void inline_size
 }
 
 void inline_size


@@ -1576,7 +1579,7 @@ ev_stop (EV_P_ W w)
 
 /*****************************************************************************/
 
 
 /*****************************************************************************/
 

-void
+void noinline

 ev_io_start (EV_P_ ev_io *w)
 {
   int fd = w->fd;
 ev_io_start (EV_P_ ev_io *w)
 {
   int fd = w->fd;


@@ -1593,7 +1596,7 @@ ev_io_start (EV_P_ ev_io *w)
   fd_change (EV_A_ fd);
 }
 
   fd_change (EV_A_ fd);
 }
 

-void
+void noinline

 ev_io_stop (EV_P_ ev_io *w)
 {
   clear_pending (EV_A_ (W)w);
 ev_io_stop (EV_P_ ev_io *w)
 {
   clear_pending (EV_A_ (W)w);


@@ -1608,7 +1611,7 @@ ev_io_stop (EV_P_ ev_io *w)
   fd_change (EV_A_ w->fd);
 }
 
   fd_change (EV_A_ w->fd);
 }
 

-void
+void noinline

 ev_timer_start (EV_P_ ev_timer *w)
 {
   if (expect_false (ev_is_active (w)))
 ev_timer_start (EV_P_ ev_timer *w)
 {
   if (expect_false (ev_is_active (w)))


@@ -1626,7 +1629,7 @@ ev_timer_start (EV_P_ ev_timer *w)
   /*assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));*/
 }
 
   /*assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));*/
 }
 

-void
+void noinline

 ev_timer_stop (EV_P_ ev_timer *w)
 {
   clear_pending (EV_A_ (W)w);
 ev_timer_stop (EV_P_ ev_timer *w)
 {
   clear_pending (EV_A_ (W)w);


@@ -1650,7 +1653,7 @@ ev_timer_stop (EV_P_ ev_timer *w)
   ev_stop (EV_A_ (W)w);
 }
 
   ev_stop (EV_A_ (W)w);
 }
 

-void
+void noinline

 ev_timer_again (EV_P_ ev_timer *w)
 {
   if (ev_is_active (w))
 ev_timer_again (EV_P_ ev_timer *w)
 {
   if (ev_is_active (w))


@@ -1671,7 +1674,7 @@ ev_timer_again (EV_P_ ev_timer *w)
 }
 
 #if EV_PERIODIC_ENABLE
 }
 
 #if EV_PERIODIC_ENABLE

-void
+void noinline

 ev_periodic_start (EV_P_ ev_periodic *w)
 {
   if (expect_false (ev_is_active (w)))
 ev_periodic_start (EV_P_ ev_periodic *w)
 {
   if (expect_false (ev_is_active (w)))


@@ -1683,8 +1686,10 @@ ev_periodic_start (EV_P_ ev_periodic *w)
     {
       assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
       /* this formula differs from the one in periodic_reify because we do not always round up */
     {
       assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
       /* this formula differs from the one in periodic_reify because we do not always round up */

-      ((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
+      ((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;

     }
     }

+  else
+    ((WT)w)->at = w->offset;

 
   ev_start (EV_A_ (W)w, ++periodiccnt);
   array_needsize (ev_periodic *, periodics, periodicmax, periodiccnt, EMPTY2);
 
   ev_start (EV_A_ (W)w, ++periodiccnt);
   array_needsize (ev_periodic *, periodics, periodicmax, periodiccnt, EMPTY2);


@@ -1694,7 +1699,7 @@ ev_periodic_start (EV_P_ ev_periodic *w)
   /*assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));*/
 }
 
   /*assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));*/
 }
 

-void
+void noinline

 ev_periodic_stop (EV_P_ ev_periodic *w)
 {
   clear_pending (EV_A_ (W)w);
 ev_periodic_stop (EV_P_ ev_periodic *w)
 {
   clear_pending (EV_A_ (W)w);


@@ -1716,7 +1721,7 @@ ev_periodic_stop (EV_P_ ev_periodic *w)
   ev_stop (EV_A_ (W)w);
 }
 
   ev_stop (EV_A_ (W)w);
 }
 

-void
+void noinline

 ev_periodic_again (EV_P_ ev_periodic *w)
 {
   /* TODO: use adjustheap and recalculation */
 ev_periodic_again (EV_P_ ev_periodic *w)
 {
   /* TODO: use adjustheap and recalculation */


@@ -1729,7 +1734,7 @@ ev_periodic_again (EV_P_ ev_periodic *w)
 # define SA_RESTART 0
 #endif
 
 # define SA_RESTART 0
 #endif
 

-void
+void noinline

 ev_signal_start (EV_P_ ev_signal *w)
 {
 #if EV_MULTIPLICITY
 ev_signal_start (EV_P_ ev_signal *w)
 {
 #if EV_MULTIPLICITY


@@ -1758,7 +1763,7 @@ ev_signal_start (EV_P_ ev_signal *w)
     }
 }
 
     }
 }
 

-void
+void noinline

 ev_signal_stop (EV_P_ ev_signal *w)
 {
   clear_pending (EV_A_ (W)w);
 ev_signal_stop (EV_P_ ev_signal *w)
 {
   clear_pending (EV_A_ (W)w);