X-Git-Url: https://git.llucax.com/software/libev.git/blobdiff_plain/40ea26d7fa3e9214a7da4bb1280515948e1a1568..647706a2acbfa58a6fdf5fb3ab17f82833faa0b0:/ev.c?ds=sidebyside

diff --git a/ev.c b/ev.c
index 4452952..221da59 100644
--- a/ev.c
+++ b/ev.c
@@ -96,6 +96,14 @@ extern "C" {
 #  endif
 # endif
 
+# ifndef EV_USE_INOTIFY
+#  if HAVE_INOTIFY_INIT && HAVE_SYS_INOTIFY_H
+#   define EV_USE_INOTIFY 1
+#  else
+#   define EV_USE_INOTIFY 0
+#  endif
+# endif
+
 #endif
 
 #include <math.h>
@@ -112,6 +120,12 @@ extern "C" {
 
 #include <signal.h>
 
+#ifdef EV_H
+# include EV_H
+#else
+# include "ev.h"
+#endif
+
 #ifndef _WIN32
 # include <sys/time.h>
 # include <sys/wait.h>
@@ -158,6 +172,10 @@ extern "C" {
 # define EV_USE_PORT 0
 #endif
 
+#ifndef EV_USE_INOTIFY
+# define EV_USE_INOTIFY 0
+#endif
+
 #ifndef EV_PID_HASHSIZE
 # if EV_MINIMAL
 #  define EV_PID_HASHSIZE 1
@@ -166,6 +184,14 @@ extern "C" {
 # endif
 #endif
 
+#ifndef EV_INOTIFY_HASHSIZE
+# if EV_MINIMAL
+#  define EV_INOTIFY_HASHSIZE 1
+# else
+#  define EV_INOTIFY_HASHSIZE 16
+# endif
+#endif
+
 /**/
 
 #ifndef CLOCK_MONOTONIC
@@ -182,18 +208,20 @@ extern "C" {
 # include <winsock.h>
 #endif
 
+#if !EV_STAT_ENABLE
+# define EV_USE_INOTIFY 0
+#endif
+
+#if EV_USE_INOTIFY
+# include <sys/inotify.h>
+#endif
+
 /**/
 
 #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 */
 
-#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 */
@@ -255,22 +283,22 @@ syserr (const char *msg)
     }
 }
 
-static void *(*alloc)(void *ptr, size_t size) = realloc;
+static void *(*alloc)(void *ptr, long size);
 
 void
-ev_set_allocator (void *(*cb)(void *ptr, size_t size))
+ev_set_allocator (void *(*cb)(void *ptr, long size))
 {
   alloc = cb;
 }
 
 inline_speed void *
-ev_realloc (void *ptr, size_t size)
+ev_realloc (void *ptr, long size)
 {
-  ptr = alloc (ptr, size);
+  ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
 
   if (!ptr && size)
     {
-      fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", (long)size);
+      fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
       abort ();
     }
 
@@ -298,6 +326,13 @@ typedef struct
   int events;
 } ANPENDING;
 
+#if EV_USE_INOTIFY
+typedef struct
+{
+  WL head;
+} ANFS;
+#endif
+
 #if EV_MULTIPLICITY
 
   struct ev_loop
@@ -556,7 +591,6 @@ 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)
       {
@@ -854,7 +888,7 @@ ev_backend (EV_P)
   return backend;
 }
 
-static void
+static void noinline
 loop_init (EV_P_ unsigned int flags)
 {
   if (!backend)
@@ -872,6 +906,12 @@ loop_init (EV_P_ unsigned int flags)
       now_floor = mn_now;
       rtmn_diff = ev_rt_now - mn_now;
 
+      /* pid check not overridable via env */
+#ifndef _WIN32
+      if (flags & EVFLAG_FORKCHECK)
+        curpid = getpid ();
+#endif
+
       if (!(flags & EVFLAG_NOENV)
           && !enable_secure ()
           && getenv ("LIBEV_FLAGS"))
@@ -881,6 +921,11 @@ loop_init (EV_P_ unsigned int flags)
         flags |= ev_recommended_backends ();
 
       backend = 0;
+      backend_fd = -1;
+#if EV_USE_INOTIFY
+      fs_fd = -2;
+#endif
+
 #if EV_USE_PORT
       if (!backend && (flags & EVBACKEND_PORT  )) backend = port_init   (EV_A_ flags);
 #endif
@@ -902,11 +947,19 @@ loop_init (EV_P_ unsigned int flags)
     }
 }
 
-static void
+static void noinline
 loop_destroy (EV_P)
 {
   int i;
 
+#if EV_USE_INOTIFY
+  if (fs_fd >= 0)
+    close (fs_fd);
+#endif
+
+  if (backend_fd >= 0)
+    close (backend_fd);
+
 #if EV_USE_PORT
   if (backend == EVBACKEND_PORT  ) port_destroy   (EV_A);
 #endif
@@ -939,7 +992,9 @@ loop_destroy (EV_P)
   backend = 0;
 }
 
-static void
+void inline_size infy_fork (EV_P);
+
+void inline_size
 loop_fork (EV_P)
 {
 #if EV_USE_PORT
@@ -951,6 +1006,9 @@ loop_fork (EV_P)
 #if EV_USE_EPOLL
   if (backend == EVBACKEND_EPOLL ) epoll_fork  (EV_A);
 #endif
+#if EV_USE_INOTIFY
+  infy_fork (EV_A);
+#endif
 
   if (ev_is_active (&sigev))
     {
@@ -1099,7 +1157,7 @@ call_pending (EV_P)
 
         if (expect_true (p->w))
           {
-            assert (("non-pending watcher on pending list", p->w->pending));
+            /*assert (("non-pending watcher on pending list", p->w->pending));*/
 
             p->w->pending = 0;
             EV_CB_INVOKE (p->w, p->events);
@@ -1114,7 +1172,7 @@ timers_reify (EV_P)
     {
       ev_timer *w = timers [0];
 
-      assert (("inactive timer on timer heap detected", ev_is_active (w)));
+      /*assert (("inactive timer on timer heap detected", ev_is_active (w)));*/
 
       /* first reschedule or stop timer */
       if (w->repeat)
@@ -1142,7 +1200,7 @@ periodics_reify (EV_P)
     {
       ev_periodic *w = periodics [0];
 
-      assert (("inactive timer on periodic heap detected", ev_is_active (w)));
+      /*assert (("inactive timer on periodic heap detected", ev_is_active (w)));*/
 
       /* first reschedule or stop timer */
       if (w->reschedule_cb)
@@ -1219,10 +1277,10 @@ time_update (EV_P)
           /* 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
+           * 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 getting preempted here.
+           * in the unlikely event of having been preempted here.
            */
           for (i = 4; --i; )
             {
@@ -1254,7 +1312,7 @@ time_update (EV_P)
           periodics_reschedule (EV_A);
 #endif
 
-          /* adjust timers. this is easy, as the offset is the same for all */
+          /* 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;
         }
@@ -1284,17 +1342,28 @@ ev_loop (EV_P_ int flags)
             ? EVUNLOOP_ONE
             : EVUNLOOP_CANCEL;
 
-  while (activecnt)
+  call_pending (EV_A); /* in case we recurse, ensure ordering stays nice and clean */
+
+  while (expect_false (!activecnt))
     {
-      /* we might have forked, so reify kernel state if necessary */
-      #if EV_FORK_ENABLE
-        if (expect_false (postfork))
-          if (forkcnt)
-            {
-              queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
-              call_pending (EV_A);
-            }
-      #endif
+#ifndef _WIN32
+      if (expect_false (curpid)) /* penalise the forking check even more */
+        if (expect_false (getpid () != curpid))
+          {
+            curpid = getpid ();
+            postfork = 1;
+          }
+#endif
+
+#if EV_FORK_ENABLE
+      /* we might have forked, so queue fork handlers */
+      if (expect_false (postfork))
+        if (forkcnt)
+          {
+            queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
+            call_pending (EV_A);
+          }
+#endif
 
       /* queue check watchers (and execute them) */
       if (expect_false (preparecnt))
@@ -1303,6 +1372,9 @@ ev_loop (EV_P_ int flags)
           call_pending (EV_A);
         }
 
+      if (expect_false (!activecnt))
+        break;
+
       /* we might have forked, so reify kernel state if necessary */
       if (expect_false (postfork))
         loop_fork (EV_A);
@@ -1312,9 +1384,9 @@ ev_loop (EV_P_ int flags)
 
       /* calculate blocking time */
       {
-        double block;
+        ev_tstamp block;
 
-        if (flags & EVLOOP_NONBLOCK || idlecnt)
+        if (expect_false (flags & EVLOOP_NONBLOCK || idlecnt || !activecnt))
           block = 0.; /* do not block at all */
         else
           {
@@ -1484,7 +1556,7 @@ ev_timer_start (EV_P_ ev_timer *w)
   timers [timercnt - 1] = w;
   upheap ((WT *)timers, timercnt - 1);
 
-  assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
+  /*assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));*/
 }
 
 void
@@ -1496,11 +1568,15 @@ ev_timer_stop (EV_P_ ev_timer *w)
 
   assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
 
-  if (expect_true (((W)w)->active < timercnt--))
-    {
-      timers [((W)w)->active - 1] = timers [timercnt];
-      adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1);
-    }
+  {
+    int active = ((W)w)->active;
+
+    if (expect_true (--active < --timercnt))
+      {
+        timers [active] = timers [timercnt];
+        adjustheap ((WT *)timers, timercnt, active);
+      }
+  }
 
   ((WT)w)->at -= mn_now;
 
@@ -1548,7 +1624,7 @@ ev_periodic_start (EV_P_ ev_periodic *w)
   periodics [periodiccnt - 1] = w;
   upheap ((WT *)periodics, periodiccnt - 1);
 
-  assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
+  /*assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));*/
 }
 
 void
@@ -1560,11 +1636,15 @@ ev_periodic_stop (EV_P_ ev_periodic *w)
 
   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);
-    }
+  {
+    int active = ((W)w)->active;
+
+    if (expect_true (--active < --periodiccnt))
+      {
+        periodics [active] = periodics [periodiccnt];
+        adjustheap ((WT *)periodics, periodiccnt, active);
+      }
+  }
 
   ev_stop (EV_A_ (W)w);
 }
@@ -1659,6 +1739,158 @@ ev_child_stop (EV_P_ ev_child *w)
 #define DEF_STAT_INTERVAL 5.0074891
 #define MIN_STAT_INTERVAL 0.1074891
 
+static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
+
+#if EV_USE_INOTIFY
+# define EV_INOTIFY_BUFSIZE 8192
+
+static void noinline
+infy_add (EV_P_ ev_stat *w)
+{
+  w->wd = inotify_add_watch (fs_fd, w->path, IN_ATTRIB | IN_DELETE_SELF | IN_MOVE_SELF | IN_MODIFY | IN_DONT_FOLLOW | IN_MASK_ADD);
+
+  if (w->wd < 0)
+    {
+      ev_timer_start (EV_A_ &w->timer); /* this is not race-free, so we still need to recheck periodically */
+
+      /* monitor some parent directory for speedup hints */
+      if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
+        {
+          char path [4096];
+          strcpy (path, w->path);
+
+          do
+            {
+              int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
+                       | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
+
+              char *pend = strrchr (path, '/');
+
+              if (!pend)
+                break; /* whoops, no '/', complain to your admin */
+
+              *pend = 0;
+              w->wd = inotify_add_watch (fs_fd, path, mask);
+            } 
+          while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
+        }
+    }
+  else
+    ev_timer_stop (EV_A_ &w->timer); /* we can watch this in a race-free way */
+
+  if (w->wd >= 0)
+    wlist_add (&fs_hash [w->wd & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
+}
+
+static void noinline
+infy_del (EV_P_ ev_stat *w)
+{
+  int slot;
+  int wd = w->wd;
+
+  if (wd < 0)
+    return;
+
+  w->wd = -2;
+  slot = wd & (EV_INOTIFY_HASHSIZE - 1);
+  wlist_del (&fs_hash [slot].head, (WL)w);
+
+  /* remove this watcher, if others are watching it, they will rearm */
+  inotify_rm_watch (fs_fd, wd);
+}
+
+static void noinline
+infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
+{
+  if (slot < 0)
+    /* overflow, need to check for all hahs slots */
+    for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
+      infy_wd (EV_A_ slot, wd, ev);
+  else
+    {
+      WL w_;
+
+      for (w_ = fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head; w_; )
+        {
+          ev_stat *w = (ev_stat *)w_;
+          w_ = w_->next; /* lets us remove this watcher and all before it */
+
+          if (w->wd == wd || wd == -1)
+            {
+              if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
+                {
+                  w->wd = -1;
+                  infy_add (EV_A_ w); /* re-add, no matter what */
+                }
+
+              stat_timer_cb (EV_A_ &w->timer, 0);
+            }
+        }
+    }
+}
+
+static void
+infy_cb (EV_P_ ev_io *w, int revents)
+{
+  char buf [EV_INOTIFY_BUFSIZE];
+  struct inotify_event *ev = (struct inotify_event *)buf;
+  int ofs;
+  int len = read (fs_fd, buf, sizeof (buf));
+
+  for (ofs = 0; ofs < len; ofs += sizeof (struct inotify_event) + ev->len)
+    infy_wd (EV_A_ ev->wd, ev->wd, ev);
+}
+
+void inline_size
+infy_init (EV_P)
+{
+  if (fs_fd != -2)
+    return;
+
+  fs_fd = inotify_init ();
+
+  if (fs_fd >= 0)
+    {
+      ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
+      ev_set_priority (&fs_w, EV_MAXPRI);
+      ev_io_start (EV_A_ &fs_w);
+    }
+}
+
+void inline_size
+infy_fork (EV_P)
+{
+  int slot;
+
+  if (fs_fd < 0)
+    return;
+
+  close (fs_fd);
+  fs_fd = inotify_init ();
+
+  for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
+    {
+      WL w_ = fs_hash [slot].head;
+      fs_hash [slot].head = 0;
+
+      while (w_)
+        {
+          ev_stat *w = (ev_stat *)w_;
+          w_ = w_->next; /* lets us add this watcher */
+
+          w->wd = -1;
+
+          if (fs_fd >= 0)
+            infy_add (EV_A_ w); /* re-add, no matter what */
+          else
+            ev_timer_start (EV_A_ &w->timer);
+        }
+
+    }
+}
+
+#endif
+
 void
 ev_stat_stat (EV_P_ ev_stat *w)
 {
@@ -1668,7 +1900,7 @@ ev_stat_stat (EV_P_ ev_stat *w)
     w->attr.st_nlink = 1;
 }
 
-static void
+static void noinline
 stat_timer_cb (EV_P_ ev_timer *w_, int revents)
 {
   ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
@@ -1678,8 +1910,28 @@ stat_timer_cb (EV_P_ ev_timer *w_, int revents)
   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);
+  /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
+  if (
+    w->prev.st_dev      != w->attr.st_dev
+    || w->prev.st_ino   != w->attr.st_ino
+    || w->prev.st_mode  != w->attr.st_mode
+    || w->prev.st_nlink != w->attr.st_nlink
+    || w->prev.st_uid   != w->attr.st_uid
+    || w->prev.st_gid   != w->attr.st_gid
+    || w->prev.st_rdev  != w->attr.st_rdev
+    || w->prev.st_size  != w->attr.st_size
+    || w->prev.st_atime != w->attr.st_atime
+    || w->prev.st_mtime != w->attr.st_mtime
+    || w->prev.st_ctime != w->attr.st_ctime
+  ) {
+      #if EV_USE_INOTIFY
+        infy_del (EV_A_ w);
+        infy_add (EV_A_ w);
+        ev_stat_stat (EV_A_ w); /* avoid race... */
+      #endif
+
+      ev_feed_event (EV_A_ w, EV_STAT);
+    }
 }
 
 void
@@ -1699,7 +1951,15 @@ ev_stat_start (EV_P_ ev_stat *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);
+
+#if EV_USE_INOTIFY
+  infy_init (EV_A);
+
+  if (fs_fd >= 0)
+    infy_add (EV_A_ w);
+  else
+#endif
+    ev_timer_start (EV_A_ &w->timer);
 
   ev_start (EV_A_ (W)w, 1);
 }
@@ -1711,6 +1971,9 @@ ev_stat_stop (EV_P_ ev_stat *w)
   if (expect_false (!ev_is_active (w)))
     return;
 
+#if EV_USE_INOTIFY
+  infy_del (EV_A_ w);
+#endif
   ev_timer_stop (EV_A_ &w->timer);
 
   ev_stop (EV_A_ (W)w);