misc

[software/libev.git] / ev.c

diff --git a/ev.c b/ev.c
index e328df3b23a116c88e440e319347537a591cc9d2..8c1337f60fedaae10bd73c4e526383089aa4fd76 100644 (file)
--- a/ev.c
+++ b/ev.c
@@ -1,53 +1,328 @@
+/*
+ * libev event processing core, watcher management
+ *
+ * Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *
+ *     * Redistributions in binary form must reproduce the above
+ *       copyright notice, this list of conditions and the following
+ *       disclaimer in the documentation and/or other materials provided
+ *       with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifndef EV_STANDALONE
+# ifdef EV_CONFIG_H
+#  include EV_CONFIG_H
+# else
+#  include "config.h"
+# endif
+
+# if HAVE_CLOCK_GETTIME
+#  ifndef EV_USE_MONOTONIC
+#   define EV_USE_MONOTONIC 1
+#  endif
+#  ifndef EV_USE_REALTIME
+#   define EV_USE_REALTIME  1
+#  endif
+# else
+#  ifndef EV_USE_MONOTONIC
+#   define EV_USE_MONOTONIC 0
+#  endif
+#  ifndef EV_USE_REALTIME
+#   define EV_USE_REALTIME  0
+#  endif
+# endif
+
+# ifndef EV_USE_SELECT
+#  if HAVE_SELECT && HAVE_SYS_SELECT_H
+#   define EV_USE_SELECT 1
+#  else
+#   define EV_USE_SELECT 0
+#  endif
+# endif
+
+# ifndef EV_USE_POLL
+#  if HAVE_POLL && HAVE_POLL_H
+#   define EV_USE_POLL 1
+#  else
+#   define EV_USE_POLL 0
+#  endif
+# endif
+   
+# ifndef EV_USE_EPOLL
+#  if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
+#   define EV_USE_EPOLL 1
+#  else
+#   define EV_USE_EPOLL 0
+#  endif
+# endif
+   
+# ifndef EV_USE_KQUEUE
+#  if HAVE_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H
+#   define EV_USE_KQUEUE 1
+#  else
+#   define EV_USE_KQUEUE 0
+#  endif
+# endif
+   
+# ifndef EV_USE_PORT
+#  if HAVE_PORT_H && HAVE_PORT_CREATE
+#   define EV_USE_PORT 1
+#  else
+#   define EV_USE_PORT 0
+#  endif
+# endif
+
+#endif
+

 #include <math.h>
 #include <stdlib.h>
 #include <math.h>
 #include <stdlib.h>

-#include <unistd.h>

 #include <fcntl.h>
 #include <fcntl.h>

-#include <signal.h>
+#include <stddef.h>

 
 #include <stdio.h>
 
 #include <assert.h>
 #include <errno.h>
 
 #include <stdio.h>
 
 #include <assert.h>
 #include <errno.h>

-#include <sys/time.h>
+#include <sys/types.h>

 #include <time.h>
 
 #include <time.h>
 

-#ifdef CLOCK_MONOTONIC
-# define HAVE_MONOTONIC 1
+#include <signal.h>
+
+#ifndef _WIN32
+# include <sys/time.h>
+# include <sys/wait.h>
+# include <unistd.h>
+#else
+# define WIN32_LEAN_AND_MEAN
+# include <windows.h>
+# ifndef EV_SELECT_IS_WINSOCKET
+#  define EV_SELECT_IS_WINSOCKET 1
+# endif
+#endif
+
+/**/
+
+#ifndef EV_USE_MONOTONIC
+# define EV_USE_MONOTONIC 0
+#endif
+
+#ifndef EV_USE_REALTIME
+# define EV_USE_REALTIME 0
+#endif
+
+#ifndef EV_USE_SELECT
+# define EV_USE_SELECT 1

 #endif
 
 #endif
 

-#define HAVE_REALTIME 1
-#define HAVE_EPOLL 1
-#define HAVE_SELECT 1
+#ifndef EV_USE_POLL
+# ifdef _WIN32
+#  define EV_USE_POLL 0
+# else
+#  define EV_USE_POLL 1
+# endif
+#endif
+
+#ifndef EV_USE_EPOLL
+# define EV_USE_EPOLL 0
+#endif
+
+#ifndef EV_USE_KQUEUE
+# define EV_USE_KQUEUE 0
+#endif
+
+#ifndef EV_USE_PORT
+# define EV_USE_PORT 0
+#endif
+
+/**/
+
+#ifndef CLOCK_MONOTONIC
+# undef EV_USE_MONOTONIC
+# define EV_USE_MONOTONIC 0
+#endif
+
+#ifndef CLOCK_REALTIME
+# undef EV_USE_REALTIME
+# define EV_USE_REALTIME 0
+#endif
+
+#if EV_SELECT_IS_WINSOCKET
+# include <winsock.h>
+#endif
+
+/**/

 
 #define MIN_TIMEJUMP  1. /* minimum timejump that gets detected (if monotonic clock available) */
 
 #define MIN_TIMEJUMP  1. /* minimum timejump that gets detected (if monotonic clock available) */

-#define MAX_BLOCKTIME 60.
+#define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
+#define PID_HASHSIZE  16 /* size of pid hash table, must be power of two */
+/*#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds */
+
+#ifdef EV_H
+# include EV_H
+#else
+# include "ev.h"
+#endif
+
+#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
+#else
+# define expect(expr,value)         (expr)
+# define inline_speed               static
+# define inline_minimal             static
+# define noinline
+#endif

 
 

-#include "ev.h"
+#define expect_false(expr) expect ((expr) != 0, 0)
+#define expect_true(expr)  expect ((expr) != 0, 1)

 
 

-struct ev_watcher {
-  EV_WATCHER (ev_watcher);
-};
+#define NUMPRI    (EV_MAXPRI - EV_MINPRI + 1)
+#define ABSPRI(w) ((w)->priority - EV_MINPRI)

 
 

-struct ev_watcher_list {
-  EV_WATCHER_LIST (ev_watcher_list);
-};
+#define EMPTY0      /* required for microsofts broken pseudo-c compiler */
+#define EMPTY2(a,b) /* used to suppress some warnings */
+
+typedef ev_watcher *W;
+typedef ev_watcher_list *WL;
+typedef ev_watcher_time *WT;
+
+static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
+
+#ifdef _WIN32
+# include "ev_win32.c"
+#endif
+
+/*****************************************************************************/
+
+static void (*syserr_cb)(const char *msg);
+
+void
+ev_set_syserr_cb (void (*cb)(const char *msg))
+{
+  syserr_cb = cb;
+}
+
+static void noinline
+syserr (const char *msg)
+{
+  if (!msg)
+    msg = "(libev) system error";
+
+  if (syserr_cb)
+    syserr_cb (msg);
+  else
+    {
+      perror (msg);
+      abort ();
+    }
+}
+
+static void *(*alloc)(void *ptr, long size);
+
+void
+ev_set_allocator (void *(*cb)(void *ptr, long size))
+{
+  alloc = cb;
+}
+
+static void *
+ev_realloc (void *ptr, long size)
+{
+  ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);

 
 

-static ev_tstamp now, diff; /* monotonic clock */
-ev_tstamp ev_now;
-int ev_method;
+  if (!ptr && size)
+    {
+      fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
+      abort ();
+    }
+
+  return ptr;
+}
+
+#define ev_malloc(size) ev_realloc (0, (size))
+#define ev_free(ptr)    ev_realloc ((ptr), 0)
+
+/*****************************************************************************/
+
+typedef struct
+{
+  WL head;
+  unsigned char events;
+  unsigned char reify;
+#if EV_SELECT_IS_WINSOCKET
+  SOCKET handle;
+#endif
+} ANFD;
+
+typedef struct
+{
+  W w;
+  int events;
+} ANPENDING;
+
+#if EV_MULTIPLICITY
+
+  struct ev_loop
+  {
+    ev_tstamp ev_rt_now;
+    #define ev_rt_now ((loop)->ev_rt_now)
+    #define VAR(name,decl) decl;
+      #include "ev_vars.h"
+    #undef VAR
+  };
+  #include "ev_wrap.h"
+
+  static struct ev_loop default_loop_struct;
+  struct ev_loop *ev_default_loop_ptr;
+
+#else
+
+  ev_tstamp ev_rt_now;
+  #define VAR(name,decl) static decl;
+    #include "ev_vars.h"
+  #undef VAR

 
 

-static int have_monotonic; /* runtime */
+  static int ev_default_loop_ptr;

 
 

-static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */
-static void (*method_modify)(int fd, int oev, int nev);
-static void (*method_poll)(ev_tstamp timeout);
+#endif

 
 /*****************************************************************************/
 
 ev_tstamp
 ev_time (void)
 {
 
 /*****************************************************************************/
 
 ev_tstamp
 ev_time (void)
 {

-#if HAVE_REALTIME
+#if EV_USE_REALTIME

   struct timespec ts;
   clock_gettime (CLOCK_REALTIME, &ts);
   return ts.tv_sec + ts.tv_nsec * 1e-9;
   struct timespec ts;
   clock_gettime (CLOCK_REALTIME, &ts);
   return ts.tv_sec + ts.tv_nsec * 1e-9;


@@ -58,11 +333,11 @@ ev_time (void)
 #endif
 }
 
 #endif
 }
 

-static ev_tstamp
+ev_tstamp inline_size

 get_clock (void)
 {
 get_clock (void)
 {

-#if HAVE_MONOTONIC
-  if (have_monotonic)
+#if EV_USE_MONOTONIC
+  if (expect_true (have_monotonic))

     {
       struct timespec ts;
       clock_gettime (CLOCK_MONOTONIC, &ts);
     {
       struct timespec ts;
       clock_gettime (CLOCK_MONOTONIC, &ts);


@@ -73,145 +348,289 @@ get_clock (void)
   return ev_time ();
 }
 
   return ev_time ();
 }
 

-#define array_needsize(base,cur,cnt,init)              \
-  if ((cnt) > cur)                                     \
-    {                                                  \
-      int newcnt = cur ? cur << 1 : 16;                        \
-      fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\
-      base = realloc (base, sizeof (*base) * (newcnt));        \
-      init (base + cur, newcnt - cur);                 \
-      cur = newcnt;                                    \
+#if EV_MULTIPLICITY
+ev_tstamp
+ev_now (EV_P)
+{
+  return ev_rt_now;
+}
+#endif
+
+#define array_roundsize(type,n) (((n) | 4) & ~3)
+
+#define array_needsize(type,base,cur,cnt,init)                 \
+  if (expect_false ((cnt) > cur))                              \
+    {                                                          \
+      int newcnt = cur;                                                \
+      do                                                       \
+        {                                                      \
+          newcnt = array_roundsize (type, newcnt << 1);                \
+        }                                                      \
+      while ((cnt) > newcnt);                                  \
+                                                               \
+      base = (type *)ev_realloc (base, sizeof (type) * (newcnt));\
+      init (base + cur, newcnt - cur);                         \
+      cur = newcnt;                                            \
+    }
+
+#define array_slim(type,stem)                                  \
+  if (stem ## max < array_roundsize (stem ## cnt >> 2))                \
+    {                                                          \
+      stem ## max = array_roundsize (stem ## cnt >> 1);                \
+      base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
+      fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\

     }
 
     }
 

+#define array_free(stem, idx) \
+  ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
+

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

-typedef struct
+void noinline
+ev_feed_event (EV_P_ void *w, int revents)

 {
 {

-  struct ev_io *head;
-  unsigned char wev, rev; /* want, received event set */
-} ANFD;
+  W w_ = (W)w;

 
 

-static ANFD *anfds;
-static int anfdmax;
+  if (expect_false (w_->pending))
+    {
+      pendings [ABSPRI (w_)][w_->pending - 1].events |= revents;
+      return;
+    }

 
 

-static int *fdchanges;
-static int fdchangemax, fdchangecnt;
+  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;
+}

 
 

-static void
+void inline_size
+queue_events (EV_P_ W *events, int eventcnt, int type)
+{
+  int i;
+
+  for (i = 0; i < eventcnt; ++i)
+    ev_feed_event (EV_A_ events [i], type);
+}
+
+/*****************************************************************************/
+
+void inline_size

 anfds_init (ANFD *base, int count)
 {
   while (count--)
     {
 anfds_init (ANFD *base, int count)
 {
   while (count--)
     {

-      base->head = 0;
-      base->wev = base->rev = EV_NONE;
+      base->head   = 0;
+      base->events = EV_NONE;
+      base->reify  = 0;
+

       ++base;
     }
 }
 
       ++base;
     }
 }
 

-typedef struct
+void inline_speed
+fd_event (EV_P_ int fd, int revents)

 {
 {

-  struct ev_watcher *w;
-  int events;
-} ANPENDING;
+  ANFD *anfd = anfds + fd;
+  ev_io *w;

 
 

-static ANPENDING *pendings;
-static int pendingmax, pendingcnt;
+  for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
+    {
+      int ev = w->events & revents;

 
 

-static void
-event (struct ev_watcher *w, int events)
+      if (ev)
+        ev_feed_event (EV_A_ (W)w, ev);
+    }
+}
+
+void
+ev_feed_fd_event (EV_P_ int fd, int revents)

 {
 {

-  w->pending = ++pendingcnt;
-  array_needsize (pendings, pendingmax, pendingcnt, );
-  pendings [pendingcnt - 1].w      = w;
-  pendings [pendingcnt - 1].events = events;
+  fd_event (EV_A_ fd, revents);

 }
 
 }
 

-static void
-fd_event (int fd, int events)
+void inline_size
+fd_reify (EV_P)

 {
 {

-  ANFD *anfd = anfds + fd;
-  struct ev_io *w;
+  int i;

 
 

-  for (w = anfd->head; w; w = w->next)
+  for (i = 0; i < fdchangecnt; ++i)

     {
     {

-      int ev = w->events & events;
+      int fd = fdchanges [i];
+      ANFD *anfd = anfds + fd;
+      ev_io *w;

 
 

-      if (ev)
-        event ((struct ev_watcher *)w, ev);
+      int events = 0;
+
+      for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
+        events |= w->events;
+
+#if EV_SELECT_IS_WINSOCKET
+      if (events)
+        {
+          unsigned long argp;
+          anfd->handle = _get_osfhandle (fd);
+          assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0));
+        }
+#endif
+
+      anfd->reify = 0;
+
+      backend_modify (EV_A_ fd, anfd->events, events);
+      anfd->events = events;

     }
     }

+
+  fdchangecnt = 0;

 }
 
 }
 

-/*****************************************************************************/
+void inline_size
+fd_change (EV_P_ int fd)
+{
+  if (expect_false (anfds [fd].reify))
+    return;
+
+  anfds [fd].reify = 1;
+
+  ++fdchangecnt;
+  array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
+  fdchanges [fdchangecnt - 1] = fd;
+}

 
 

-static struct ev_timer **atimers;
-static int atimermax, atimercnt;
+void inline_speed
+fd_kill (EV_P_ int fd)
+{
+  ev_io *w;

 
 

-static struct ev_timer **rtimers;
-static int rtimermax, rtimercnt;
+  while ((w = (ev_io *)anfds [fd].head))
+    {
+      ev_io_stop (EV_A_ w);
+      ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
+    }
+}

 
 

-static void
-upheap (struct ev_timer **timers, int k)
+int inline_size
+fd_valid (int fd)
+{
+#ifdef _WIN32
+  return _get_osfhandle (fd) != -1;
+#else
+  return fcntl (fd, F_GETFD) != -1;
+#endif
+}
+
+/* called on EBADF to verify fds */
+static void noinline
+fd_ebadf (EV_P)
+{
+  int fd;
+
+  for (fd = 0; fd < anfdmax; ++fd)
+    if (anfds [fd].events)
+      if (!fd_valid (fd) == -1 && errno == EBADF)
+        fd_kill (EV_A_ fd);
+}
+
+/* called on ENOMEM in select/poll to kill some fds and retry */
+static void noinline
+fd_enomem (EV_P)
+{
+  int fd;
+
+  for (fd = anfdmax; fd--; )
+    if (anfds [fd].events)
+      {
+        fd_kill (EV_A_ fd);
+        return;
+      }
+}
+
+/* usually called after fork if backend needs to re-arm all fds from scratch */
+static void noinline
+fd_rearm_all (EV_P)
+{
+  int fd;
+
+  /* this should be highly optimised to not do anything but set a flag */
+  for (fd = 0; fd < anfdmax; ++fd)
+    if (anfds [fd].events)
+      {
+        anfds [fd].events = 0;
+        fd_change (EV_A_ fd);
+      }
+}
+
+/*****************************************************************************/
+
+void inline_speed
+upheap (WT *heap, int k)

 {
 {

-  struct ev_timer *w = timers [k];
+  WT w = heap [k];

 
 

-  while (k && timers [k >> 1]->at > w->at)
+  while (k && heap [k >> 1]->at > w->at)

     {
     {

-      timers [k] = timers [k >> 1];
-      timers [k]->active = k + 1;
+      heap [k] = heap [k >> 1];
+      ((W)heap [k])->active = k + 1;

       k >>= 1;
     }
 
       k >>= 1;
     }
 

-  timers [k] = w;
-  timers [k]->active = k + 1;
+  heap [k] = w;
+  ((W)heap [k])->active = k + 1;

 
 }
 
 
 }
 

-static void
-downheap (struct ev_timer **timers, int N, int k)
+void inline_speed
+downheap (WT *heap, int N, int k)

 {
 {

-  struct ev_timer *w = timers [k];
+  WT w = heap [k];

 
   while (k < (N >> 1))
     {
       int j = k << 1;
 
 
   while (k < (N >> 1))
     {
       int j = k << 1;
 

-      if (j + 1 < N && timers [j]->at > timers [j + 1]->at)
+      if (j + 1 < N && heap [j]->at > heap [j + 1]->at)

         ++j;
 
         ++j;
 

-      if (w->at <= timers [j]->at)
+      if (w->at <= heap [j]->at)

         break;
 
         break;
 

-      timers [k] = timers [j];
-      timers [k]->active = k + 1;
+      heap [k] = heap [j];
+      ((W)heap [k])->active = k + 1;

       k = j;
     }
 
       k = j;
     }
 

-  timers [k] = w;
-  timers [k]->active = k + 1;
+  heap [k] = w;
+  ((W)heap [k])->active = k + 1;
+}
+
+void inline_size
+adjustheap (WT *heap, int N, int k)
+{
+  upheap (heap, k);
+  downheap (heap, N, k);

 }
 
 /*****************************************************************************/
 
 typedef struct
 {
 }
 
 /*****************************************************************************/
 
 typedef struct
 {

-  struct ev_signal *head;
-  sig_atomic_t gotsig;
+  WL head;
+  sig_atomic_t volatile gotsig;

 } ANSIG;
 
 static ANSIG *signals;
 static int signalmax;
 
 static int sigpipe [2];
 } ANSIG;
 
 static ANSIG *signals;
 static int signalmax;
 
 static int sigpipe [2];

-static sig_atomic_t gotsig;
-static struct ev_io sigev;
+static sig_atomic_t volatile gotsig;
+static ev_io sigev;

 
 

-static void
+void inline_size

 signals_init (ANSIG *base, int count)
 {
   while (count--)
     {
       base->head   = 0;
       base->gotsig = 0;
 signals_init (ANSIG *base, int count)
 {
   while (count--)
     {
       base->head   = 0;
       base->gotsig = 0;

+

       ++base;
     }
 }
       ++base;
     }
 }


@@ -219,317 +638,741 @@ signals_init (ANSIG *base, int count)
 static void
 sighandler (int signum)
 {
 static void
 sighandler (int signum)
 {

+#if _WIN32
+  signal (signum, sighandler);
+#endif
+

   signals [signum - 1].gotsig = 1;
 
   if (!gotsig)
     {
   signals [signum - 1].gotsig = 1;
 
   if (!gotsig)
     {

+      int old_errno = errno;

       gotsig = 1;
       gotsig = 1;

-      write (sigpipe [1], &gotsig, 1);
+      write (sigpipe [1], &signum, 1);
+      errno = old_errno;

     }
 }
 
     }
 }
 

-static void
-sigcb (struct ev_io *iow, int revents)
+void noinline
+ev_feed_signal_event (EV_P_ int signum)

 {
 {

-  struct ev_signal *w;
-  int sig;
+  WL w;

 
 

-  gotsig = 0;
-  read (sigpipe [0], &revents, 1);
+#if EV_MULTIPLICITY
+  assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
+#endif

 
 

-  for (sig = signalmax; sig--; )
-    if (signals [sig].gotsig)
-      {
-        signals [sig].gotsig = 0;
+  --signum;

 
 

-        for (w = signals [sig].head; w; w = w->next)
-          event ((struct ev_watcher *)w, EV_SIGNAL);
-      }
+  if (signum < 0 || signum >= signalmax)
+    return;
+
+  signals [signum].gotsig = 0;
+
+  for (w = signals [signum].head; w; w = w->next)
+    ev_feed_event (EV_A_ (W)w, EV_SIGNAL);

 }
 
 static void
 }
 
 static void

-siginit (void)
+sigcb (EV_P_ ev_io *iow, int revents)

 {
 {

-  fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
-  fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
+  int signum;

 
 

-  /* rather than sort out wether we really need nb, set it */
-  fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
-  fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
+  read (sigpipe [0], &revents, 1);
+  gotsig = 0;

 
 

-  evio_set (&sigev, sigpipe [0], EV_READ);
-  evio_start (&sigev);
+  for (signum = signalmax; signum--; )
+    if (signals [signum].gotsig)
+      ev_feed_signal_event (EV_A_ signum + 1);

 }
 
 }
 

-/*****************************************************************************/
-
-#if HAVE_EPOLL
-# include "ev_epoll.c"
-#endif
-#if HAVE_SELECT
-# include "ev_select.c"
+void inline_size
+fd_intern (int fd)
+{
+#ifdef _WIN32
+  int arg = 1;
+  ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
+#else
+  fcntl (fd, F_SETFD, FD_CLOEXEC);
+  fcntl (fd, F_SETFL, O_NONBLOCK);

 #endif
 #endif

+}

 
 

-int ev_init (int flags)
+static void noinline
+siginit (EV_P)

 {
 {

-#if HAVE_MONOTONIC
-  {
-    struct timespec ts;
-    if (!clock_gettime (CLOCK_MONOTONIC, &ts))
-      have_monotonic = 1;
-  }
-#endif
+  fd_intern (sigpipe [0]);
+  fd_intern (sigpipe [1]);

 
 

-  ev_now = ev_time ();
-  now    = get_clock ();
-  diff   = ev_now - now;
+  ev_io_set (&sigev, sigpipe [0], EV_READ);
+  ev_io_start (EV_A_ &sigev);
+  ev_unref (EV_A); /* child watcher should not keep loop alive */
+}

 
 

-  if (pipe (sigpipe))
-    return 0;
+/*****************************************************************************/

 
 

-  ev_method = EVMETHOD_NONE;
-#if HAVE_EPOLL
-  if (ev_method == EVMETHOD_NONE) epoll_init (flags);
-#endif
-#if HAVE_SELECT
-  if (ev_method == EVMETHOD_NONE) select_init (flags);
+static ev_child *childs [PID_HASHSIZE];
+
+#ifndef _WIN32
+
+static ev_signal childev;
+
+#ifndef WCONTINUED
+# define WCONTINUED 0

 #endif
 
 #endif
 

-  if (ev_method)
+void inline_speed
+child_reap (EV_P_ ev_signal *sw, int chain, int pid, int status)
+{
+  ev_child *w;
+
+  for (w = (ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
+    if (w->pid == pid || !w->pid)
+      {
+        ev_priority (w) = ev_priority (sw); /* need to do it *now* */
+        w->rpid         = pid;
+        w->rstatus      = status;
+        ev_feed_event (EV_A_ (W)w, EV_CHILD);
+      }
+}
+
+static void
+childcb (EV_P_ ev_signal *sw, int revents)
+{
+  int pid, status;
+
+  if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))

     {
     {

-      evw_init (&sigev, sigcb, 0);
-      siginit ();
-    }
+      /* make sure we are called again until all childs have been reaped */
+      /* we need to do it this way so that the callback gets called before we continue */
+      ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);

 
 

-  return ev_method;
+      child_reap (EV_A_ sw, pid, pid, status);
+      child_reap (EV_A_ sw,   0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
+    }

 }
 
 }
 

+#endif
+

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

-void ev_prefork (void)
+#if EV_USE_PORT
+# include "ev_port.c"
+#endif
+#if EV_USE_KQUEUE
+# include "ev_kqueue.c"
+#endif
+#if EV_USE_EPOLL
+# include "ev_epoll.c"
+#endif
+#if EV_USE_POLL
+# include "ev_poll.c"
+#endif
+#if EV_USE_SELECT
+# include "ev_select.c"
+#endif
+
+int
+ev_version_major (void)

 {
 {

+  return EV_VERSION_MAJOR;

 }
 
 }
 

-void ev_postfork_parent (void)
+int
+ev_version_minor (void)

 {
 {

+  return EV_VERSION_MINOR;

 }
 
 }
 

-void ev_postfork_child (void)
+/* return true if we are running with elevated privileges and should ignore env variables */
+int inline_size
+enable_secure (void)

 {
 {

-#if HAVE_EPOLL
-  if (ev_method == EVMETHOD_EPOLL)
-    epoll_postfork_child ();
+#ifdef _WIN32
+  return 0;
+#else
+  return getuid () != geteuid ()
+      || getgid () != getegid ();

 #endif
 #endif

+}

 
 

-  evio_stop (&sigev);
-  close (sigpipe [0]);
-  close (sigpipe [1]);
-  pipe (sigpipe);
-  siginit ();
+unsigned int
+ev_supported_backends (void)
+{
+  unsigned int flags = 0;
+
+  if (EV_USE_PORT  ) flags |= EVBACKEND_PORT;
+  if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
+  if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
+  if (EV_USE_POLL  ) flags |= EVBACKEND_POLL;
+  if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
+  
+  return flags;

 }
 
 }
 

-/*****************************************************************************/
+unsigned int
+ev_recommended_backends (void)
+{
+  unsigned int flags = ev_supported_backends ();

 
 

-static ev_hook hooks [EVHOOK_NUM];
+#ifndef __NetBSD__
+  /* kqueue is borked on everything but netbsd apparently */
+  /* it usually doesn't work correctly on anything but sockets and pipes */
+  flags &= ~EVBACKEND_KQUEUE;
+#endif
+#ifdef __APPLE__
+  // flags &= ~EVBACKEND_KQUEUE; for documentation
+  flags &= ~EVBACKEND_POLL;
+#endif

 
 

-void
-ev_hook_register (int type, ev_hook hook)
-{
-  hooks [type] = hook;
+  return flags;

 }
 
 }
 

-void
-ev_hook_unregister (int type, ev_hook hook)
+unsigned int
+ev_embeddable_backends (void)

 {
 {

-  hooks [type] = 0;
+  return EVBACKEND_EPOLL
+       | EVBACKEND_KQUEUE
+       | EVBACKEND_PORT;

 }
 
 }
 

-static void
-hook_call (int type)
+unsigned int
+ev_backend (EV_P)

 {
 {

-  if (hooks [type])
-    hooks [type] ();
+  return backend;

 }
 
 static void
 }
 
 static void

-fd_reify (void)
+loop_init (EV_P_ unsigned int flags)

 {
 {

-  int i;
-
-  for (i = 0; i < fdchangecnt; ++i)
+  if (!backend)

     {
     {

-      int fd = fdchanges [i];
-      ANFD *anfd = anfds + fd;
-      struct ev_io *w;
+#if EV_USE_MONOTONIC
+      {
+        struct timespec ts;
+        if (!clock_gettime (CLOCK_MONOTONIC, &ts))
+          have_monotonic = 1;
+      }
+#endif

 
 

-      int wev = 0;
+      ev_rt_now = ev_time ();
+      mn_now    = get_clock ();
+      now_floor = mn_now;
+      rtmn_diff = ev_rt_now - mn_now;

 
 

-      for (w = anfd->head; w; w = w->next)
-        wev |= w->events;
+      if (!(flags & EVFLAG_NOENV)
+          && !enable_secure ()
+          && getenv ("LIBEV_FLAGS"))
+        flags = atoi (getenv ("LIBEV_FLAGS"));

 
 

-      if (anfd->wev != wev)
-        {
-          method_modify (fd, anfd->wev, wev);
-          anfd->wev = wev;
-        }
-    }
+      if (!(flags & 0x0000ffffUL))
+        flags |= ev_recommended_backends ();

 
 

-  fdchangecnt = 0;
+      backend = 0;
+#if EV_USE_PORT
+      if (!backend && (flags & EVBACKEND_PORT  )) backend = port_init   (EV_A_ flags);
+#endif
+#if EV_USE_KQUEUE
+      if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
+#endif
+#if EV_USE_EPOLL
+      if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init  (EV_A_ flags);
+#endif
+#if EV_USE_POLL
+      if (!backend && (flags & EVBACKEND_POLL  )) backend = poll_init   (EV_A_ flags);
+#endif
+#if EV_USE_SELECT
+      if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
+#endif
+
+      ev_init (&sigev, sigcb);
+      ev_set_priority (&sigev, EV_MAXPRI);
+    }

 }
 
 static void
 }
 
 static void

-call_pending ()
+loop_destroy (EV_P)

 {
   int i;
 
 {
   int i;
 

-  for (i = 0; i < pendingcnt; ++i)
+#if EV_USE_PORT
+  if (backend == EVBACKEND_PORT  ) port_destroy   (EV_A);
+#endif
+#if EV_USE_KQUEUE
+  if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
+#endif
+#if EV_USE_EPOLL
+  if (backend == EVBACKEND_EPOLL ) epoll_destroy  (EV_A);
+#endif
+#if EV_USE_POLL
+  if (backend == EVBACKEND_POLL  ) poll_destroy   (EV_A);
+#endif
+#if EV_USE_SELECT
+  if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
+#endif
+
+  for (i = NUMPRI; i--; )
+    array_free (pending, [i]);
+
+  /* have to use the microsoft-never-gets-it-right macro */
+  array_free (fdchange, EMPTY0);
+  array_free (timer, EMPTY0);
+#if EV_PERIODIC_ENABLE
+  array_free (periodic, EMPTY0);
+#endif
+  array_free (idle, EMPTY0);
+  array_free (prepare, EMPTY0);
+  array_free (check, EMPTY0);
+
+  backend = 0;
+}
+
+static void
+loop_fork (EV_P)
+{
+#if EV_USE_PORT
+  if (backend == EVBACKEND_PORT  ) port_fork   (EV_A);
+#endif
+#if EV_USE_KQUEUE
+  if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
+#endif
+#if EV_USE_EPOLL
+  if (backend == EVBACKEND_EPOLL ) epoll_fork  (EV_A);
+#endif
+
+  if (ev_is_active (&sigev))
+    {
+      /* default loop */
+
+      ev_ref (EV_A);
+      ev_io_stop (EV_A_ &sigev);
+      close (sigpipe [0]);
+      close (sigpipe [1]);
+
+      while (pipe (sigpipe))
+        syserr ("(libev) error creating pipe");
+
+      siginit (EV_A);
+    }
+
+  postfork = 0;
+}
+
+#if EV_MULTIPLICITY
+struct ev_loop *
+ev_loop_new (unsigned int flags)
+{
+  struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
+
+  memset (loop, 0, sizeof (struct ev_loop));
+
+  loop_init (EV_A_ flags);
+
+  if (ev_backend (EV_A))
+    return loop;
+
+  return 0;
+}
+
+void
+ev_loop_destroy (EV_P)
+{
+  loop_destroy (EV_A);
+  ev_free (loop);
+}
+
+void
+ev_loop_fork (EV_P)
+{
+  postfork = 1;
+}
+
+#endif
+
+#if EV_MULTIPLICITY
+struct ev_loop *
+ev_default_loop_init (unsigned int flags)
+#else
+int
+ev_default_loop (unsigned int flags)
+#endif
+{
+  if (sigpipe [0] == sigpipe [1])
+    if (pipe (sigpipe))
+      return 0;
+
+  if (!ev_default_loop_ptr)

     {
     {

-      ANPENDING *p = pendings + i;
+#if EV_MULTIPLICITY
+      struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
+#else
+      ev_default_loop_ptr = 1;
+#endif
+
+      loop_init (EV_A_ flags);

 
 

-      if (p->w)
+      if (ev_backend (EV_A))

         {
         {

-          p->w->pending = 0;
-          p->w->cb (p->w, p->events);
+          siginit (EV_A);
+
+#ifndef _WIN32
+          ev_signal_init (&childev, childcb, SIGCHLD);
+          ev_set_priority (&childev, EV_MAXPRI);
+          ev_signal_start (EV_A_ &childev);
+          ev_unref (EV_A); /* child watcher should not keep loop alive */
+#endif

         }
         }

+      else
+        ev_default_loop_ptr = 0;

     }
 
     }
 

-  pendingcnt = 0;
+  return ev_default_loop_ptr;

 }
 
 }
 

-static void
-timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)
+void
+ev_default_destroy (void)
+{
+#if EV_MULTIPLICITY
+  struct ev_loop *loop = ev_default_loop_ptr;
+#endif
+
+#ifndef _WIN32
+  ev_ref (EV_A); /* child watcher */
+  ev_signal_stop (EV_A_ &childev);
+#endif
+
+  ev_ref (EV_A); /* signal watcher */
+  ev_io_stop (EV_A_ &sigev);
+
+  close (sigpipe [0]); sigpipe [0] = 0;
+  close (sigpipe [1]); sigpipe [1] = 0;
+
+  loop_destroy (EV_A);
+}
+
+void
+ev_default_fork (void)
+{
+#if EV_MULTIPLICITY
+  struct ev_loop *loop = ev_default_loop_ptr;
+#endif
+
+  if (backend)
+    postfork = 1;
+}
+
+/*****************************************************************************/
+
+int inline_size
+any_pending (EV_P)
+{
+  int pri;
+
+  for (pri = NUMPRI; pri--; )
+    if (pendingcnt [pri])
+      return 1;
+
+  return 0;
+}
+
+void inline_speed
+call_pending (EV_P)
+{
+  int pri;
+
+  for (pri = NUMPRI; pri--; )
+    while (pendingcnt [pri])
+      {
+        ANPENDING *p = pendings [pri] + --pendingcnt [pri];
+
+        if (expect_true (p->w))
+          {
+            assert (("non-pending watcher on pending list", p->w->pending));
+
+            p->w->pending = 0;
+            EV_CB_INVOKE (p->w, p->events);
+          }
+      }
+}
+
+void inline_size
+timers_reify (EV_P)

 {
 {

-  while (timercnt && timers [0]->at <= now)
+  while (timercnt && ((WT)timers [0])->at <= mn_now)

     {
     {

-      struct ev_timer *w = timers [0];
+      ev_timer *w = timers [0];
+
+      assert (("inactive timer on timer heap detected", ev_is_active (w)));

 
       /* first reschedule or stop timer */
       if (w->repeat)
         {
 
       /* first reschedule or stop timer */
       if (w->repeat)
         {

-          if (w->is_abs)
-            w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat;
-          else
-            w->at = now + w->repeat;
+          assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));

 
 

-          assert (w->at > now);
+          ((WT)w)->at += w->repeat;
+          if (((WT)w)->at < mn_now)
+            ((WT)w)->at = mn_now;

 
 

-          downheap (timers, timercnt, 0);
+          downheap ((WT *)timers, timercnt, 0);

         }
       else
         }
       else

+        ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
+
+      ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
+    }
+}
+
+#if EV_PERIODIC_ENABLE
+void inline_size
+periodics_reify (EV_P)
+{
+  while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
+    {
+      ev_periodic *w = periodics [0];
+
+      assert (("inactive timer on periodic heap detected", ev_is_active (w)));
+
+      /* first reschedule or stop timer */
+      if (w->reschedule_cb)

         {
         {

-          evtimer_stop (w); /* nonrepeating: stop timer */
-          --timercnt; /* maybe pass by reference instead? */
+          ((WT)w)->at = w->reschedule_cb (w, ev_rt_now + 0.0001);
+          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;
+          assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
+          downheap ((WT *)periodics, periodiccnt, 0);
+        }
+      else
+        ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */

 
 

-      event ((struct ev_watcher *)w, EV_TIMEOUT);
+      ev_feed_event (EV_A_ (W)w, EV_PERIODIC);

     }
 }
 
     }
 }
 

-static void
-time_update ()
+static void noinline
+periodics_reschedule (EV_P)

 {
   int i;
 {
   int i;

-  ev_now = ev_time ();

 
 

-  if (have_monotonic)
+  /* adjust periodics after time jump */
+  for (i = 0; i < periodiccnt; ++i)

     {
     {

-      ev_tstamp odiff = diff;
+      ev_periodic *w = periodics [i];

 
 

-      /* detecting time jumps is much more difficult */
-      for (i = 2; --i; ) /* loop a few times, before making important decisions */
-        {
-          now = get_clock ();
-          diff = ev_now - now;
+      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;
+    }

 
 

-          if (fabs (odiff - diff) < MIN_TIMEJUMP)
-            return; /* all is well */
+  /* now rebuild the heap */
+  for (i = periodiccnt >> 1; i--; )
+    downheap ((WT *)periodics, periodiccnt, i);
+}
+#endif

 
 

-          ev_now = ev_time ();
-        }
+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)
+{
+  int i;

 
 

-      /* time jump detected, reschedule atimers */
-      for (i = 0; i < atimercnt; ++i)
+#if EV_USE_MONOTONIC
+  if (expect_true (have_monotonic))
+    {
+      if (time_update_monotonic (EV_A))

         {
         {

-          struct ev_timer *w = atimers [i];
-          w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;
+          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 guarenteed
+           * 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 getting preempted here.
+           */
+          for (i = 4; --i; )
+            {
+              rtmn_diff = ev_rt_now - mn_now;
+
+              if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
+                return; /* all is well */
+
+              ev_rt_now = ev_time ();
+              mn_now    = get_clock ();
+              now_floor = mn_now;
+            }
+
+# if EV_PERIODIC_ENABLE
+          periodics_reschedule (EV_A);
+# endif
+          /* no timer adjustment, as the monotonic clock doesn't jump */
+          /* timers_reschedule (EV_A_ rtmn_diff - odiff) */

         }
     }
   else
         }
     }
   else

+#endif

     {
     {

-      if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
-        /* time jump detected, adjust rtimers */
-        for (i = 0; i < rtimercnt; ++i)
-          rtimers [i]->at += ev_now - now;
+      ev_rt_now = ev_time ();
+
+      if (expect_false (mn_now > ev_rt_now || mn_now < ev_rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
+        {
+#if EV_PERIODIC_ENABLE
+          periodics_reschedule (EV_A);
+#endif

 
 

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

     }
 }
 
     }
 }
 

-int ev_loop_done;
+void
+ev_ref (EV_P)
+{
+  ++activecnt;
+}
+
+void
+ev_unref (EV_P)
+{
+  --activecnt;
+}
+
+static int loop_done;

 
 

-void ev_loop (int flags)
+void
+ev_loop (EV_P_ int flags)

 {
 {

-  double block;
-  ev_loop_done = flags & EVLOOP_ONESHOT;
+  loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK)
+            ? EVUNLOOP_ONE
+            : EVUNLOOP_CANCEL;

 
 

-  do
+  while (activecnt)

     {
     {

-      hook_call (EVHOOK_PREPOLL);
+      /* queue check watchers (and execute them) */
+      if (expect_false (preparecnt))
+        {
+          queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
+          call_pending (EV_A);
+        }
+
+      /* we might have forked, so reify kernel state if necessary */
+      if (expect_false (postfork))
+        loop_fork (EV_A);

 
       /* update fd-related kernel structures */
 
       /* update fd-related kernel structures */

-      fd_reify ();
+      fd_reify (EV_A);

 
       /* calculate blocking time */
 
       /* calculate blocking time */

-      if (flags & EVLOOP_NONBLOCK)
-        block = 0.;
-      else
-        {
-          block = MAX_BLOCKTIME;
+      {
+        double block;
+
+        if (flags & EVLOOP_NONBLOCK || idlecnt)
+          block = 0.; /* do not block at all */
+        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;
+              }
+
+            block = MAX_BLOCKTIME;
+
+            if (timercnt)
+              {
+                ev_tstamp to = ((WT)timers [0])->at - mn_now + backend_fudge;
+                if (block > to) block = to;
+              }
+
+#if EV_PERIODIC_ENABLE
+            if (periodiccnt)
+              {
+                ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + backend_fudge;
+                if (block > to) block = to;
+              }
+#endif

 
 

-          if (rtimercnt)
-            {
-              ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;
-              if (block > to) block = to;
-            }
+            if (expect_false (block < 0.)) block = 0.;
+          }

 
 

-          if (atimercnt)
-            {
-              ev_tstamp to = atimers [0]->at - ev_time   () + method_fudge;
-              if (block > to) block = to;
-            }
+        backend_poll (EV_A_ block);
+      }

 
 

-          if (block < 0.) block = 0.;
-        }
+      /* update ev_rt_now, do magic */
+      time_update (EV_A);

 
 

-      method_poll (block);
+      /* queue pending timers and reschedule them */
+      timers_reify (EV_A); /* relative timers called last */
+#if EV_PERIODIC_ENABLE
+      periodics_reify (EV_A); /* absolute timers called first */
+#endif

 
 

-      /* update ev_now, do magic */
-      time_update ();
+      /* queue idle watchers unless other events are pending */
+      if (idlecnt && !any_pending (EV_A))
+        queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);

 
 

-      hook_call (EVHOOK_POSTPOLL);
+      /* queue check watchers, to be executed first */
+      if (expect_false (checkcnt))
+        queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);

 
 

-      /* put pending timers into pendign queue and reschedule them */
-      /* absolute timers first */
-      timers_reify (atimers, atimercnt, ev_now);
-      /* relative timers second */
-      timers_reify (rtimers, rtimercnt, now);
+      call_pending (EV_A);

 
 

-      call_pending ();
+      if (expect_false (loop_done))
+        break;

     }
     }

-  while (!ev_loop_done);
+
+  if (loop_done == EVUNLOOP_ONE)
+    loop_done = EVUNLOOP_CANCEL;
+}
+
+void
+ev_unloop (EV_P_ int how)
+{
+  loop_done = how;

 }
 
 /*****************************************************************************/
 
 }
 
 /*****************************************************************************/
 

-static void
-wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)
+void inline_size
+wlist_add (WL *head, WL elem)

 {
   elem->next = *head;
   *head = elem;
 }
 
 {
   elem->next = *head;
   *head = elem;
 }
 

-static void
-wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)
+void inline_size
+wlist_del (WL *head, WL elem)

 {
   while (*head)
     {
 {
   while (*head)
     {


@@ -543,209 +1386,503 @@ wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)
     }
 }
 
     }
 }
 

-static void
-ev_start (struct ev_watcher *w, int active)
+void inline_speed
+ev_clear_pending (EV_P_ W w)

 {
 {

-  w->pending = 0;
-  w->active = active;
+  if (w->pending)
+    {
+      pendings [ABSPRI (w)][w->pending - 1].w = 0;
+      w->pending = 0;
+    }

 }
 
 }
 

-static void
-ev_stop (struct ev_watcher *w)
+void inline_speed
+ev_start (EV_P_ W w, int active)

 {
 {

-  if (w->pending)
-    pendings [w->pending - 1].w = 0;
+  if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
+  if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
+
+  w->active = active;
+  ev_ref (EV_A);
+}

 
 

+void inline_size
+ev_stop (EV_P_ W w)
+{
+  ev_unref (EV_A);

   w->active = 0;
   w->active = 0;

-  /* nop */

 }
 
 /*****************************************************************************/
 
 void
 }
 
 /*****************************************************************************/
 
 void

-evio_start (struct ev_io *w)
+ev_io_start (EV_P_ ev_io *w)

 {
 {

-  if (ev_is_active (w))
+  int fd = w->fd;
+
+  if (expect_false (ev_is_active (w)))

     return;
 
     return;
 

-  int fd = w->fd;
+  assert (("ev_io_start called with negative fd", fd >= 0));

 
 

-  ev_start ((struct ev_watcher *)w, 1);
-  array_needsize (anfds, anfdmax, fd + 1, anfds_init);
-  wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w);
+  ev_start (EV_A_ (W)w, 1);
+  array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
+  wlist_add ((WL *)&anfds[fd].head, (WL)w);

 
 

-  ++fdchangecnt;
-  array_needsize (fdchanges, fdchangemax, fdchangecnt, );
-  fdchanges [fdchangecnt - 1] = fd;
+  fd_change (EV_A_ fd);

 }
 
 void
 }
 
 void

-evio_stop (struct ev_io *w)
+ev_io_stop (EV_P_ ev_io *w)

 {
 {

-  if (!ev_is_active (w))
+  ev_clear_pending (EV_A_ (W)w);
+  if (expect_false (!ev_is_active (w)))

     return;
 
     return;
 

-  wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w);
-  ev_stop ((struct ev_watcher *)w);
+  assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));

 
 

-  ++fdchangecnt;
-  array_needsize (fdchanges, fdchangemax, fdchangecnt, );
-  fdchanges [fdchangecnt - 1] = w->fd;
+  wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
+  ev_stop (EV_A_ (W)w);
+
+  fd_change (EV_A_ w->fd);

 }
 
 void
 }
 
 void

-evtimer_start (struct ev_timer *w)
+ev_timer_start (EV_P_ ev_timer *w)

 {
 {

-  if (ev_is_active (w))
+  if (expect_false (ev_is_active (w)))

     return;
 
     return;
 

-  if (w->is_abs)
-    {
-      /* this formula differs from the one in timer_reify becuse we do not round up */
-      if (w->repeat)
-        w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;
+  ((WT)w)->at += mn_now;

 
 

-      ev_start ((struct ev_watcher *)w, ++atimercnt);
-      array_needsize (atimers, atimermax, atimercnt, );
-      atimers [atimercnt - 1] = w;
-      upheap (atimers, atimercnt - 1);
-    }
-  else
-    {
-      w->at += now;
+  assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));

 
 

-      ev_start ((struct ev_watcher *)w, ++rtimercnt);
-      array_needsize (rtimers, rtimermax, rtimercnt, );
-      rtimers [rtimercnt - 1] = w;
-      upheap (rtimers, rtimercnt - 1);
-    }
+  ev_start (EV_A_ (W)w, ++timercnt);
+  array_needsize (ev_timer *, timers, timermax, timercnt, EMPTY2);
+  timers [timercnt - 1] = w;
+  upheap ((WT *)timers, timercnt - 1);

 
 

+  assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));

 }
 
 void
 }
 
 void

-evtimer_stop (struct ev_timer *w)
+ev_timer_stop (EV_P_ ev_timer *w)

 {
 {

-  if (!ev_is_active (w))
+  ev_clear_pending (EV_A_ (W)w);
+  if (expect_false (!ev_is_active (w)))

     return;
 
     return;
 

-  if (w->is_abs)
+  assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
+
+  if (expect_true (((W)w)->active < timercnt--))

     {
     {

-      if (w->active < atimercnt--)
-        {
-          atimers [w->active - 1] = atimers [atimercnt];
-          downheap (atimers, atimercnt, w->active - 1);
-        }
+      timers [((W)w)->active - 1] = timers [timercnt];
+      adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1);

     }
     }

-  else
+
+  ((WT)w)->at -= mn_now;
+
+  ev_stop (EV_A_ (W)w);
+}
+
+void
+ev_timer_again (EV_P_ ev_timer *w)
+{
+  if (ev_is_active (w))

     {
     {

-      if (w->active < rtimercnt--)
+      if (w->repeat)

         {
         {

-          rtimers [w->active - 1] = rtimers [rtimercnt];
-          downheap (rtimers, rtimercnt, w->active - 1);
+          ((WT)w)->at = mn_now + w->repeat;
+          adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1);

         }
         }

+      else
+        ev_timer_stop (EV_A_ w);
+    }
+  else if (w->repeat)
+    {
+      w->at = w->repeat;
+      ev_timer_start (EV_A_ w);
+    }
+}
+
+#if EV_PERIODIC_ENABLE
+void
+ev_periodic_start (EV_P_ ev_periodic *w)
+{
+  if (expect_false (ev_is_active (w)))
+    return;
+
+  if (w->reschedule_cb)
+    ((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
+  else if (w->interval)
+    {
+      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;

     }
 
     }
 

-  ev_stop ((struct ev_watcher *)w);
+  ev_start (EV_A_ (W)w, ++periodiccnt);
+  array_needsize (ev_periodic *, periodics, periodicmax, periodiccnt, EMPTY2);
+  periodics [periodiccnt - 1] = w;
+  upheap ((WT *)periodics, periodiccnt - 1);
+
+  assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));

 }
 
 void
 }
 
 void

-evsignal_start (struct ev_signal *w)
+ev_periodic_stop (EV_P_ ev_periodic *w)

 {
 {

-  if (ev_is_active (w))
+  ev_clear_pending (EV_A_ (W)w);
+  if (expect_false (!ev_is_active (w)))
+    return;
+
+  assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
+
+  if (expect_true (((W)w)->active < periodiccnt--))
+    {
+      periodics [((W)w)->active - 1] = periodics [periodiccnt];
+      adjustheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
+    }
+
+  ev_stop (EV_A_ (W)w);
+}
+
+void
+ev_periodic_again (EV_P_ ev_periodic *w)
+{
+  /* TODO: use adjustheap and recalculation */
+  ev_periodic_stop (EV_A_ w);
+  ev_periodic_start (EV_A_ w);
+}
+#endif
+
+void
+ev_idle_start (EV_P_ ev_idle *w)
+{
+  if (expect_false (ev_is_active (w)))
+    return;
+
+  ev_start (EV_A_ (W)w, ++idlecnt);
+  array_needsize (ev_idle *, idles, idlemax, idlecnt, EMPTY2);
+  idles [idlecnt - 1] = w;
+}
+
+void
+ev_idle_stop (EV_P_ ev_idle *w)
+{
+  ev_clear_pending (EV_A_ (W)w);
+  if (expect_false (!ev_is_active (w)))
+    return;
+
+  {
+    int active = ((W)w)->active;
+    idles [active - 1] = idles [--idlecnt];
+    ((W)idles [active - 1])->active = active;
+  }
+
+  ev_stop (EV_A_ (W)w);
+}
+
+void
+ev_prepare_start (EV_P_ ev_prepare *w)
+{
+  if (expect_false (ev_is_active (w)))
+    return;
+
+  ev_start (EV_A_ (W)w, ++preparecnt);
+  array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
+  prepares [preparecnt - 1] = w;
+}
+
+void
+ev_prepare_stop (EV_P_ ev_prepare *w)
+{
+  ev_clear_pending (EV_A_ (W)w);
+  if (expect_false (!ev_is_active (w)))
+    return;
+
+  {
+    int active = ((W)w)->active;
+    prepares [active - 1] = prepares [--preparecnt];
+    ((W)prepares [active - 1])->active = active;
+  }
+
+  ev_stop (EV_A_ (W)w);
+}
+
+void
+ev_check_start (EV_P_ ev_check *w)
+{
+  if (expect_false (ev_is_active (w)))
+    return;
+
+  ev_start (EV_A_ (W)w, ++checkcnt);
+  array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
+  checks [checkcnt - 1] = w;
+}
+
+void
+ev_check_stop (EV_P_ ev_check *w)
+{
+  ev_clear_pending (EV_A_ (W)w);
+  if (expect_false (!ev_is_active (w)))
+    return;
+
+  {
+    int active = ((W)w)->active;
+    checks [active - 1] = checks [--checkcnt];
+    ((W)checks [active - 1])->active = active;
+  }
+
+  ev_stop (EV_A_ (W)w);
+}
+
+#ifndef SA_RESTART
+# define SA_RESTART 0
+#endif
+
+void
+ev_signal_start (EV_P_ ev_signal *w)
+{
+#if EV_MULTIPLICITY
+  assert (("signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
+#endif
+  if (expect_false (ev_is_active (w)))

     return;
 
     return;
 

-  ev_start ((struct ev_watcher *)w, 1);
-  array_needsize (signals, signalmax, w->signum, signals_init);
-  wlist_add ((struct ev_watcher_list **)&signals [w->signum - 1].head, (struct ev_watcher_list *)w);
+  assert (("ev_signal_start called with illegal signal number", w->signum > 0));
+
+  ev_start (EV_A_ (W)w, 1);
+  array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
+  wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);

 
 

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

     {
     {

+#if _WIN32
+      signal (w->signum, sighandler);
+#else

       struct sigaction sa;
       sa.sa_handler = sighandler;
       sigfillset (&sa.sa_mask);
       struct sigaction sa;
       sa.sa_handler = sighandler;
       sigfillset (&sa.sa_mask);

-      sa.sa_flags = 0;
+      sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */

       sigaction (w->signum, &sa, 0);
       sigaction (w->signum, &sa, 0);

+#endif

     }
 }
 
 void
     }
 }
 
 void

-evsignal_stop (struct ev_signal *w)
+ev_signal_stop (EV_P_ ev_signal *w)

 {
 {

-  if (!ev_is_active (w))
+  ev_clear_pending (EV_A_ (W)w);
+  if (expect_false (!ev_is_active (w)))

     return;
 
     return;
 

-  wlist_del ((struct ev_watcher_list **)&signals [w->signum - 1].head, (struct ev_watcher_list *)w);
-  ev_stop ((struct ev_watcher *)w);
+  wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
+  ev_stop (EV_A_ (W)w);

 
   if (!signals [w->signum - 1].head)
     signal (w->signum, SIG_DFL);
 }
 
 
   if (!signals [w->signum - 1].head)
     signal (w->signum, SIG_DFL);
 }
 

-/*****************************************************************************/
-#if 1
+void
+ev_child_start (EV_P_ ev_child *w)
+{
+#if EV_MULTIPLICITY
+  assert (("child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
+#endif
+  if (expect_false (ev_is_active (w)))
+    return;

 
 

-static void
-sin_cb (struct ev_io *w, int revents)
+  ev_start (EV_A_ (W)w, 1);
+  wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
+}
+
+void
+ev_child_stop (EV_P_ ev_child *w)

 {
 {

-  fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
+  ev_clear_pending (EV_A_ (W)w);
+  if (expect_false (!ev_is_active (w)))
+    return;
+
+  wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
+  ev_stop (EV_A_ (W)w);

 }
 
 }
 

-static void
-ocb (struct ev_timer *w, int revents)
+#if EV_EMBED_ENABLE
+void noinline
+ev_embed_sweep (EV_P_ ev_embed *w)

 {
 {

-  //fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
-  evtimer_stop (w);
-  evtimer_start (w);
+  ev_loop (w->loop, EVLOOP_NONBLOCK);

 }
 
 static void
 }
 
 static void

-scb (struct ev_signal *w, int revents)
+embed_cb (EV_P_ ev_io *io, int revents)

 {
 {

-  fprintf (stderr, "signal %x,%d\n", revents, w->signum);
+  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);

 }
 
 }
 

-int main (void)
+void
+ev_embed_start (EV_P_ ev_embed *w)

 {
 {

-  struct ev_io sin;
+  if (expect_false (ev_is_active (w)))
+    return;

 
 

-  ev_init (0);
+  {
+    struct ev_loop *loop = w->loop;
+    assert (("loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
+    ev_io_init (&w->io, embed_cb, backend_fd, EV_READ);
+  }

 
 

-  evw_init (&sin, sin_cb, 55);
-  evio_set (&sin, 0, EV_READ);
-  evio_start (&sin);
+  ev_set_priority (&w->io, ev_priority (w));
+  ev_io_start (EV_A_ &w->io);

 
 

-  struct ev_timer t[10000];
+  ev_start (EV_A_ (W)w, 1);
+}

 
 

-#if 1
-  int i;
-  for (i = 0; i < 10000; ++i)
-    {
-      struct ev_timer *w = t + i;
-      evw_init (w, ocb, i);
-      evtimer_set_abs (w, drand48 (), 0.99775533);
-      evtimer_start (w);
-      if (drand48 () < 0.5)
-        evtimer_stop (w);
-    }
+void
+ev_embed_stop (EV_P_ ev_embed *w)
+{
+  ev_clear_pending (EV_A_ (W)w);
+  if (expect_false (!ev_is_active (w)))
+    return;
+
+  ev_io_stop (EV_A_ &w->io);
+
+  ev_stop (EV_A_ (W)w);
+}

 #endif
 
 #endif
 

-  struct ev_timer t1;
-  evw_init (&t1, ocb, 0);
-  evtimer_set_abs (&t1, 5, 10);
-  evtimer_start (&t1);
+#if EV_STAT_ENABLE

 
 

-  struct ev_signal sig;
-  evw_init (&sig, scb, 65535);
-  evsignal_set (&sig, SIGQUIT);
-  evsignal_start (&sig);
+# ifdef _WIN32
+#  define lstat(a,b) stat(a,b)
+# endif

 
 

-  ev_loop (0);
+void
+ev_stat_stat (EV_P_ ev_stat *w)
+{
+  if (lstat (w->path, &w->attr) < 0)
+    w->attr.st_nlink = 0;
+  else if (!w->attr.st_nlink)
+    w->attr.st_nlink = 1;
+}

 
 

-  return 0;
+static void
+stat_timer_cb (EV_P_ ev_timer *w_, int revents)
+{
+  ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
+
+  /* we copy this here each the time so that */
+  /* prev has the old value when the callback gets invoked */
+  w->prev = w->attr;
+  ev_stat_stat (EV_A_ w);
+
+  if (memcmp (&w->prev, &w->attr, sizeof (ev_statdata)))
+    ev_feed_event (EV_A_ w, EV_STAT);
+}
+
+void
+ev_stat_start (EV_P_ ev_stat *w)
+{
+  if (expect_false (ev_is_active (w)))
+    return;
+
+  /* since we use memcmp, we need to clear any padding data etc. */
+  memset (&w->prev, 0, sizeof (ev_statdata));
+  memset (&w->attr, 0, sizeof (ev_statdata));
+
+  ev_stat_stat (EV_A_ w);
+
+  ev_timer_init (&w->timer, stat_timer_cb, w->interval, w->interval);
+  ev_set_priority (&w->timer, ev_priority (w));
+  ev_timer_start (EV_A_ &w->timer);
+
+  ev_start (EV_A_ (W)w, 1);

 }
 
 }
 

+void
+ev_stat_stop (EV_P_ ev_stat *w)
+{
+  ev_clear_pending (EV_A_ (W)w);
+  if (expect_false (!ev_is_active (w)))
+    return;
+
+  ev_timer_stop (EV_A_ &w->timer);
+
+  ev_stop (EV_A_ (W)w);
+}

 #endif
 
 #endif
 

+/*****************************************************************************/
+
+struct ev_once
+{
+  ev_io io;
+  ev_timer to;
+  void (*cb)(int revents, void *arg);
+  void *arg;
+};
+
+static void
+once_cb (EV_P_ struct ev_once *once, int revents)
+{
+  void (*cb)(int revents, void *arg) = once->cb;
+  void *arg = once->arg;
+
+  ev_io_stop (EV_A_ &once->io);
+  ev_timer_stop (EV_A_ &once->to);
+  ev_free (once);
+
+  cb (revents, arg);
+}
+
+static void
+once_cb_io (EV_P_ ev_io *w, int revents)
+{
+  once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
+}
+
+static void
+once_cb_to (EV_P_ ev_timer *w, int revents)
+{
+  once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
+}

 
 

+void
+ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
+{
+  struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));

 
 

+  if (expect_false (!once))
+    {
+      cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
+      return;
+    }
+
+  once->cb  = cb;
+  once->arg = arg;
+
+  ev_init (&once->io, once_cb_io);
+  if (fd >= 0)
+    {
+      ev_io_set (&once->io, fd, events);
+      ev_io_start (EV_A_ &once->io);
+    }
+
+  ev_init (&once->to, once_cb_to);
+  if (timeout >= 0.)
+    {
+      ev_timer_set (&once->to, timeout, 0.);
+      ev_timer_start (EV_A_ &once->to);
+    }
+}
+
+#ifdef __cplusplus
+}
+#endif