--- gvpe/src/iom.C	2003/03/21 21:21:02	1.3
+++ gvpe/src/iom.C	2003/04/02 21:02:25	1.9
@@ -26,7 +26,7 @@
 #include "slog.h"
 #include "iom.h"
 
-inline bool lowest_first (const time_watcher *a, const time_watcher *b)
+inline bool earliest_first (const time_watcher *a, const time_watcher *b)
 {
   return a->at > b->at;
 }
@@ -37,17 +37,36 @@
 
 void time_watcher::set (tstamp when)
 {
-  iom.unreg (this);
   at = when;
-  iom.reg (this);
+
+  if (registered)
+    iom.reschedule_time_watchers ();
+  else
+    iom.reg (this);
+}
+
+void time_watcher::trigger ()
+{
+  call (*this);
+
+  if (registered)
+    iom.reschedule_time_watchers ();
+  else
+    iom.reg (this);
+}
+
+void time_watcher::start ()
+{
+  if (!registered)
+    iom.reg (this);
 }
 
-void io_manager::reg (int fd, short events, io_watcher *w)
+void io_manager::reg (io_watcher *w)
 {
   pollfd pfd;
 
-  pfd.fd     = fd;
-  pfd.events = events;
+  pfd.fd     = w->fd;
+  pfd.events = w->events;
 
   pfs.push_back (pfd);
   iow.push_back (w);
@@ -78,29 +97,39 @@
     }
 }
 
+void io_manager::reschedule_time_watchers ()
+{
+  make_heap (tw.begin (), tw.end (), earliest_first);
+}
+
 void io_manager::reg (time_watcher *w)
 {
+  if (w->registered)
+    slog (L_CRIT, "FATAL: io_manager::reg(time_watcher) called on already-registered watcher");
+
+  w->registered = true;
+
   tw.push_back (w);
-  push_heap (tw.begin (), tw.end (), lowest_first);
+  push_heap (tw.begin (), tw.end (), earliest_first);
 }
 
 void io_manager::unreg (time_watcher *w)
 {
-  unsigned int sz = tw.size ();
-  unsigned int i = find (tw.begin (), tw.end (), w) - tw.begin ();
-
-  if (i != sz)
+  if (w->registered)
     {
-      if (sz == 1)
-        tw.clear ();
-      else 
+      unsigned int sz = tw.size ();
+      unsigned int i = find (tw.begin (), tw.end (), w) - tw.begin ();
+
+      if (i != sz)
         {
           if (i != sz - 1)
             tw[i] = tw[sz - 1];
 
           tw.pop_back ();
-          make_heap (tw.begin (), tw.end (), lowest_first);
+          reschedule_time_watchers ();
         }
+
+      w->registered = false;
     }
 }
 
@@ -117,40 +146,56 @@
 {
   set_now ();
 
-  while (!(iow.empty () && tw.empty ()))
+  for (;;)
     {
-      int timeout = tw.empty ()
-                    ? 3600 * 1000 // wake up at least every hour
-                    : (int) ((tw[0]->at - NOW) * 1000);
+      while (tw[0]->at <= NOW)
+        {
+          // remove the first watcher
+          time_watcher *w = tw[0];
 
-      printf ("s%d t%d #%d\n", pfs.size (), timeout, tw.size ());
+          pop_heap (tw.begin (), tw.end (), earliest_first);
+          tw.pop_back ();
 
-      if (timeout >= 0)
-        {
-          int fds = poll (&pfs[0], pfs.size (), timeout);
+          w->registered = false;
 
-          set_now ();
+          // call it
+          w->call (*w);
 
-          for (unsigned int i = iow.size (); fds && i--; )
-            if (pfs[i].revents)
-              {
-                --fds;
-                iow[i]->call (pfs[i].revents);
-              }
+          // re-add it if necessary
+          if (w->at >= 0 && !w->registered)
+            reg (w);
         }
 
-      while (!tw.empty () && tw[0]->at <= NOW)
-        {
-          pop_heap (tw.begin (), tw.end (), lowest_first);
-          (*(tw.end () - 1))->trigger ();
-          push_heap (tw.begin (), tw.end (), lowest_first);
-        }
+      int timeout = (int) ((tw[0]->at - NOW) * 1000);
+
+      int fds = poll (&pfs[0], pfs.size (), timeout);
+
+      set_now ();
+
+      vector<io_watcher *>::iterator w;
+      vector<pollfd>::iterator p;
+
+      for (w = iow.begin (), p = pfs.begin ();
+           fds > 0 && w < iow.end ();
+           ++w, ++p)
+        if (p->revents)
+          {
+            --fds;
+            (*w)->call (**w, p->revents);
+          }
     }
 }
 
+void io_manager::idle_cb (time_watcher &w)
+{
+  w.at = NOW + 86400; // wake up every day, for no good reason
+}
+
 io_manager::io_manager ()
 {
   set_now ();
+  idle = new time_watcher (this, &io_manager::idle_cb);
+  idle->start (0);
 }
 
 io_manager::~io_manager ()