rework docs, finish embed implementation

[software/libev.git] / ev.c

diff --git a/ev.c b/ev.c
index e87da22585746f6470433433d27988503ee77760..7efc7e0bdc7bebb5413294064c5814ba38a9294e 100644 (file)
--- a/ev.c
+++ b/ev.c
@@ -56,6 +56,14 @@ extern "C" {
 #  endif
 # endif
 
 #  endif
 # endif
 

+# ifndef EV_USE_NANOSLEEP
+#  if HAVE_NANOSLEEP
+#   define EV_USE_NANOSLEEP 1
+#  else
+#   define EV_USE_NANOSLEEP 0
+#  endif
+# endif
+

 # ifndef EV_USE_SELECT
 #  if HAVE_SELECT && HAVE_SYS_SELECT_H
 #   define EV_USE_SELECT 1
 # ifndef EV_USE_SELECT
 #  if HAVE_SELECT && HAVE_SYS_SELECT_H
 #   define EV_USE_SELECT 1


@@ -148,6 +156,10 @@ extern "C" {
 # define EV_USE_REALTIME 0
 #endif
 
 # define EV_USE_REALTIME 0
 #endif
 

+#ifndef EV_USE_NANOSLEEP
+# define EV_USE_NANOSLEEP 0
+#endif
+

 #ifndef EV_USE_SELECT
 # define EV_USE_SELECT 1
 #endif
 #ifndef EV_USE_SELECT
 # define EV_USE_SELECT 1
 #endif


@@ -204,18 +216,25 @@ extern "C" {
 # define EV_USE_REALTIME 0
 #endif
 
 # define EV_USE_REALTIME 0
 #endif
 

-#if EV_SELECT_IS_WINSOCKET
-# include <winsock.h>
-#endif
-

 #if !EV_STAT_ENABLE
 #if !EV_STAT_ENABLE

+# undef EV_USE_INOTIFY

 # define EV_USE_INOTIFY 0
 #endif
 
 # define EV_USE_INOTIFY 0
 #endif
 

+#if !EV_USE_NANOSLEEP
+# ifndef _WIN32
+#  include <sys/select.h>
+# endif
+#endif
+

 #if EV_USE_INOTIFY
 # include <sys/inotify.h>
 #endif
 
 #if EV_USE_INOTIFY
 # include <sys/inotify.h>
 #endif
 

+#if EV_SELECT_IS_WINSOCKET
+# include <winsock.h>
+#endif
+

 /**/
 
 /*
 /**/
 
 /*


@@ -232,7 +251,7 @@ extern "C" {
 #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, TODO */
 
 #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, TODO */
 

-#if __GNUC__ >= 3
+#if __GNUC__ >= 4

 # define expect(expr,value)         __builtin_expect ((expr),(value))
 # define noinline                   __attribute__ ((noinline))
 #else
 # define expect(expr,value)         __builtin_expect ((expr),(value))
 # define noinline                   __attribute__ ((noinline))
 #else


@@ -263,7 +282,9 @@ typedef ev_watcher *W;
 typedef ev_watcher_list *WL;
 typedef ev_watcher_time *WT;
 
 typedef ev_watcher_list *WL;
 typedef ev_watcher_time *WT;
 

-static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
+/* sig_atomic_t is used to avoid per-thread variables or locking but still */
+/* giving it a reasonably high chance of working on typical architetcures */
+static sig_atomic_t have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */

 
 #ifdef _WIN32
 # include "ev_win32.c"
 
 #ifdef _WIN32
 # include "ev_win32.c"


@@ -409,6 +430,33 @@ ev_now (EV_P)
 }
 #endif
 
 }
 #endif
 

+void
+ev_sleep (ev_tstamp delay)
+{
+  if (delay > 0.)
+    {
+#if EV_USE_NANOSLEEP
+      struct timespec ts;
+
+      ts.tv_sec  = (time_t)delay;
+      ts.tv_nsec = (long)((delay - (ev_tstamp)(ts.tv_sec)) * 1e9);
+
+      nanosleep (&ts, 0);
+#elif defined(_WIN32)
+      Sleep (delay * 1e3);
+#else
+      struct timeval tv;
+
+      tv.tv_sec  = (time_t)delay;
+      tv.tv_usec = (long)((delay - (ev_tstamp)(tv.tv_sec)) * 1e6);
+
+      select (0, 0, 0, 0, &tv);
+#endif
+    }
+}
+
+/*****************************************************************************/
+

 int inline_size
 array_nextsize (int elem, int cur, int cnt)
 {
 int inline_size
 array_nextsize (int elem, int cur, int cnt)
 {


@@ -535,10 +583,10 @@ fd_reify (EV_P)
       ANFD *anfd = anfds + fd;
       ev_io *w;
 
       ANFD *anfd = anfds + fd;
       ev_io *w;
 

-      int events = 0;
+      unsigned char events = 0;

 
       for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
 
       for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)

-        events |= w->events;
+        events |= (unsigned char)w->events;

 
 #if EV_SELECT_IS_WINSOCKET
       if (events)
 
 #if EV_SELECT_IS_WINSOCKET
       if (events)


@@ -549,26 +597,33 @@ fd_reify (EV_P)
         }
 #endif
 
         }
 #endif
 

-      anfd->reify = 0;
+      {
+        unsigned char o_events = anfd->events;
+        unsigned char o_reify  = anfd->reify;

 
 

-      backend_modify (EV_A_ fd, anfd->events, events);
-      anfd->events = events;
+        anfd->reify  = 0;
+        anfd->events = events;
+
+        if (o_events != events || o_reify & EV_IOFDSET)
+          backend_modify (EV_A_ fd, o_events, events);
+      }

     }
 
   fdchangecnt = 0;
 }
 
 void inline_size
     }
 
   fdchangecnt = 0;
 }
 
 void inline_size

-fd_change (EV_P_ int fd)
+fd_change (EV_P_ int fd, int flags)

 {
 {

-  if (expect_false (anfds [fd].reify))
-    return;
-
-  anfds [fd].reify = 1;
+  unsigned char reify = anfds [fd].reify;
+  anfds [fd].reify |= flags;

 
 

-  ++fdchangecnt;
-  array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
-  fdchanges [fdchangecnt - 1] = fd;
+  if (expect_true (!reify))
+    {
+      ++fdchangecnt;
+      array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
+      fdchanges [fdchangecnt - 1] = fd;
+    }

 }
 
 void inline_speed
 }
 
 void inline_speed


@@ -629,7 +684,7 @@ fd_rearm_all (EV_P)
     if (anfds [fd].events)
       {
         anfds [fd].events = 0;
     if (anfds [fd].events)
       {
         anfds [fd].events = 0;

-        fd_change (EV_A_ fd);
+        fd_change (EV_A_ fd, EV_IOFDSET | 1);

       }
 }
 
       }
 }
 


@@ -794,7 +849,7 @@ siginit (EV_P)
 
 /*****************************************************************************/
 
 
 /*****************************************************************************/
 

-static ev_child *childs [EV_PID_HASHSIZE];
+static WL childs [EV_PID_HASHSIZE];

 
 #ifndef _WIN32
 
 
 #ifndef _WIN32
 


@@ -919,8 +974,8 @@ ev_recommended_backends (void)
 unsigned int
 ev_embeddable_backends (void)
 {
 unsigned int
 ev_embeddable_backends (void)
 {

-  return EVBACKEND_EPOLL
-       | EVBACKEND_KQUEUE
+  /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
+  return EVBACKEND_KQUEUE

        | EVBACKEND_PORT;
 }
 
        | EVBACKEND_PORT;
 }
 


@@ -936,6 +991,18 @@ ev_loop_count (EV_P)
   return loop_count;
 }
 
   return loop_count;
 }
 

+void
+ev_set_io_collect_interval (EV_P_ ev_tstamp interval)
+{
+  io_blocktime = interval;
+}
+
+void
+ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval)
+{
+  timeout_blocktime = interval;
+}
+

 static void noinline
 loop_init (EV_P_ unsigned int flags)
 {
 static void noinline
 loop_init (EV_P_ unsigned int flags)
 {


@@ -954,6 +1021,9 @@ loop_init (EV_P_ unsigned int flags)
       now_floor = mn_now;
       rtmn_diff = ev_rt_now - mn_now;
 
       now_floor = mn_now;
       rtmn_diff = ev_rt_now - mn_now;
 

+      io_blocktime      = 0.;
+      timeout_blocktime = 0.;
+

       /* pid check not overridable via env */
 #ifndef _WIN32
       if (flags & EVFLAG_FORKCHECK)
       /* pid check not overridable via env */
 #ifndef _WIN32
       if (flags & EVFLAG_FORKCHECK)


@@ -1032,11 +1102,16 @@ loop_destroy (EV_P)
 #endif
     }
 
 #endif
     }
 

+  ev_free (anfds); anfdmax = 0;
+

   /* have to use the microsoft-never-gets-it-right macro */
   array_free (fdchange, EMPTY);
   array_free (timer, EMPTY);
 #if EV_PERIODIC_ENABLE
   array_free (periodic, EMPTY);
   /* have to use the microsoft-never-gets-it-right macro */
   array_free (fdchange, EMPTY);
   array_free (timer, EMPTY);
 #if EV_PERIODIC_ENABLE
   array_free (periodic, EMPTY);

+#endif
+#if EV_FORK_ENABLE
+  array_free (fork, EMPTY);

 #endif
   array_free (prepare, EMPTY);
   array_free (check, EMPTY);
 #endif
   array_free (prepare, EMPTY);
   array_free (check, EMPTY);


@@ -1445,39 +1520,50 @@ ev_loop (EV_P_ int flags)
 
       /* calculate blocking time */
       {
 
       /* calculate blocking time */
       {

-        ev_tstamp block;
+        ev_tstamp waittime  = 0.;
+        ev_tstamp sleeptime = 0.;

 
 

-        if (expect_false (flags & EVLOOP_NONBLOCK || idleall || !activecnt))
-          block = 0.; /* do not block at all */
-        else
+        if (expect_true (!(flags & EVLOOP_NONBLOCK || idleall || !activecnt)))

           {
             /* update time to cancel out callback processing overhead */
             time_update (EV_A_ 1e100);
 
           {
             /* update time to cancel out callback processing overhead */
             time_update (EV_A_ 1e100);
 

-            block = MAX_BLOCKTIME;
+            waittime = MAX_BLOCKTIME;

 
             if (timercnt)
               {
                 ev_tstamp to = ((WT)timers [0])->at - mn_now + backend_fudge;
 
             if (timercnt)
               {
                 ev_tstamp to = ((WT)timers [0])->at - mn_now + backend_fudge;

-                if (block > to) block = to;
+                if (waittime > to) waittime = to;

               }
 
 #if EV_PERIODIC_ENABLE
             if (periodiccnt)
               {
                 ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + backend_fudge;
               }
 
 #if EV_PERIODIC_ENABLE
             if (periodiccnt)
               {
                 ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + backend_fudge;

-                if (block > to) block = to;
+                if (waittime > to) waittime = to;

               }
 #endif
 
               }
 #endif
 

-            if (expect_false (block < 0.)) block = 0.;
+            if (expect_false (waittime < timeout_blocktime))
+              waittime = timeout_blocktime;
+
+            sleeptime = waittime - backend_fudge;
+
+            if (expect_true (sleeptime > io_blocktime))
+              sleeptime = io_blocktime;
+
+            if (sleeptime)
+              {
+                ev_sleep (sleeptime);
+                waittime -= sleeptime;
+              }

           }
 
         ++loop_count;
           }
 
         ++loop_count;

-        backend_poll (EV_A_ block);
+        backend_poll (EV_A_ waittime);

 
         /* update ev_rt_now, do magic */
 
         /* update ev_rt_now, do magic */

-        time_update (EV_A_ block);
+        time_update (EV_A_ waittime + sleeptime);

       }
 
       /* queue pending timers and reschedule them */
       }
 
       /* queue pending timers and reschedule them */


@@ -1599,9 +1685,10 @@ ev_io_start (EV_P_ ev_io *w)
 
   ev_start (EV_A_ (W)w, 1);
   array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
 
   ev_start (EV_A_ (W)w, 1);
   array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);

-  wlist_add ((WL *)&anfds[fd].head, (WL)w);
+  wlist_add (&anfds[fd].head, (WL)w);

 
 

-  fd_change (EV_A_ fd);
+  fd_change (EV_A_ fd, w->events & EV_IOFDSET | 1);
+  w->events &= ~EV_IOFDSET;

 }
 
 void noinline
 }
 
 void noinline


@@ -1613,10 +1700,10 @@ ev_io_stop (EV_P_ ev_io *w)
 
   assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
 
 
   assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
 

-  wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
+  wlist_del (&anfds[w->fd].head, (WL)w);

   ev_stop (EV_A_ (W)w);
 
   ev_stop (EV_A_ (W)w);
 

-  fd_change (EV_A_ w->fd);
+  fd_change (EV_A_ w->fd, 1);

 }
 
 void noinline
 }
 
 void noinline


@@ -1768,7 +1855,7 @@ ev_signal_start (EV_P_ ev_signal *w)
   }
 
   ev_start (EV_A_ (W)w, 1);
   }
 
   ev_start (EV_A_ (W)w, 1);

-  wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
+  wlist_add (&signals [w->signum - 1].head, (WL)w);

 
   if (!((WL)w)->next)
     {
 
   if (!((WL)w)->next)
     {


@@ -1791,7 +1878,7 @@ ev_signal_stop (EV_P_ ev_signal *w)
   if (expect_false (!ev_is_active (w)))
     return;
 
   if (expect_false (!ev_is_active (w)))
     return;
 

-  wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
+  wlist_del (&signals [w->signum - 1].head, (WL)w);

   ev_stop (EV_A_ (W)w);
 
   if (!signals [w->signum - 1].head)
   ev_stop (EV_A_ (W)w);
 
   if (!signals [w->signum - 1].head)


@@ -1808,7 +1895,7 @@ ev_child_start (EV_P_ ev_child *w)
     return;
 
   ev_start (EV_A_ (W)w, 1);
     return;
 
   ev_start (EV_A_ (W)w, 1);

-  wlist_add ((WL *)&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
+  wlist_add (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);

 }
 
 void
 }
 
 void


@@ -1818,7 +1905,7 @@ ev_child_stop (EV_P_ ev_child *w)
   if (expect_false (!ev_is_active (w)))
     return;
 
   if (expect_false (!ev_is_active (w)))
     return;
 

-  wlist_del ((WL *)&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
+  wlist_del (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);

   ev_stop (EV_A_ (W)w);
 }
 
   ev_stop (EV_A_ (W)w);
 }
 


@@ -2170,20 +2257,44 @@ ev_check_stop (EV_P_ ev_check *w)
 void noinline
 ev_embed_sweep (EV_P_ ev_embed *w)
 {
 void noinline
 ev_embed_sweep (EV_P_ ev_embed *w)
 {

-  ev_loop (w->loop, EVLOOP_NONBLOCK);
+  ev_loop (w->other, EVLOOP_NONBLOCK);

 }
 
 static void
 }
 
 static void

-embed_cb (EV_P_ ev_io *io, int revents)
+embed_io_cb (EV_P_ ev_io *io, int revents)

 {
   ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
 
   if (ev_cb (w))
     ev_feed_event (EV_A_ (W)w, EV_EMBED);
   else
 {
   ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
 
   if (ev_cb (w))
     ev_feed_event (EV_A_ (W)w, EV_EMBED);
   else

-    ev_embed_sweep (loop, w);
+    ev_loop (w->other, EVLOOP_NONBLOCK);

 }
 
 }
 

+static void
+embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
+{
+  ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
+
+  {
+    struct ev_loop *loop = w->other;
+
+    while (fdchangecnt)
+      {
+        fd_reify (EV_A);
+        ev_loop (EV_A_ EVLOOP_NONBLOCK);
+      }
+  }
+}
+
+#if 0
+static void
+embed_idle_cb (EV_P_ ev_idle *idle, int revents)
+{
+  ev_idle_stop (EV_A_ idle);
+}
+#endif
+

 void
 ev_embed_start (EV_P_ ev_embed *w)
 {
 void
 ev_embed_start (EV_P_ ev_embed *w)
 {


@@ -2191,14 +2302,20 @@ ev_embed_start (EV_P_ ev_embed *w)
     return;
 
   {
     return;
 
   {

-    struct ev_loop *loop = w->loop;
+    struct ev_loop *loop = w->other;

     assert (("loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
     assert (("loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));

-    ev_io_init (&w->io, embed_cb, backend_fd, EV_READ);
+    ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);

   }
 
   ev_set_priority (&w->io, ev_priority (w));
   ev_io_start (EV_A_ &w->io);
 
   }
 
   ev_set_priority (&w->io, ev_priority (w));
   ev_io_start (EV_A_ &w->io);
 

+  ev_prepare_init (&w->prepare, embed_prepare_cb);
+  ev_set_priority (&w->prepare, EV_MINPRI);
+  ev_prepare_start (EV_A_ &w->prepare);
+
+  /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
+

   ev_start (EV_A_ (W)w, 1);
 }
 
   ev_start (EV_A_ (W)w, 1);
 }
 


@@ -2210,6 +2327,7 @@ ev_embed_stop (EV_P_ ev_embed *w)
     return;
 
   ev_io_stop (EV_A_ &w->io);
     return;
 
   ev_io_stop (EV_A_ &w->io);

+  ev_prepare_stop (EV_A_ &w->prepare);

 
   ev_stop (EV_A_ (W)w);
 }
 
   ev_stop (EV_A_ (W)w);
 }


@@ -2308,6 +2426,10 @@ ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, vo
     }
 }
 
     }
 }
 

+#if EV_MULTIPLICITY
+  #include "ev_wrap.h"
+#endif
+

 #ifdef __cplusplus
 }
 #endif
 #ifdef __cplusplus
 }
 #endif