--- gvpe/src/iom.C	2003/03/21 20:33:36	1.1
+++ gvpe/src/iom.C	2003/04/04 05:26:45	1.10
@@ -1,4 +1,3 @@
-#include <unistd.h>
 /*
     iom.C -- I/O multiplexor
  
@@ -25,43 +24,74 @@
 #include <functional>
 
 #include "slog.h"
-
 #include "iom.h"
 
-inline bool lowest_first (const time_watcher *a, const time_watcher *b)
+tstamp NOW;
+bool iom_valid;
+io_manager iom;
+
+inline bool earliest_first (const time_watcher *a, const time_watcher *b)
 {
   return a->at > b->at;
 }
 
-timestamp NOW;
+void time_watcher::set (tstamp when)
+{
+  at = when;
 
-io_manager iom;
+  if (registered)
+    iom.reschedule_time_watchers ();
+  else
+    iom.reg (this);
+}
 
-void time_watcher::set (timestamp when)
+void time_watcher::trigger ()
 {
-  iom.unreg (this);
-  at = when;
-  iom.reg (this);
+  call (*this);
+
+  if (registered)
+    iom.reschedule_time_watchers ();
+  else
+    iom.reg (this);
 }
 
-void io_manager::reg (int fd, short events, io_watcher *w)
+void time_watcher::start ()
 {
-  pollfd pfd;
+  if (!registered)
+    iom.reg (this);
+}
+
+time_watcher::~time_watcher ()
+{
+  if (iom_valid)
+    iom.unreg (this);
+}
+
+io_watcher::~io_watcher ()
+{
+  if (iom_valid)
+    iom.unreg (this);
+}
 
-  pfd.fd     = fd;
-  pfd.events = events;
+void io_manager::reg (io_watcher *w)
+{
+  pollfd pfd;
 
   pfs.push_back (pfd);
   iow.push_back (w);
+
+  w->p = &(*(pfs.end () - 1));
 }
 
 void io_manager::unreg (io_watcher *w)
 {
-  unsigned int sz = iow.size ();
-  unsigned int i = find (iow.begin (), iow.end (), w) - iow.begin ();
-
-  if (i != sz)
+  if (w->p)
     {
+      unsigned int sz = iow.size ();
+      unsigned int i = find (iow.begin (), iow.end (), w) - iow.begin ();
+
+      assert (i != sz);
+
       if (sz == 1)
         {
           pfs.clear ();
@@ -77,32 +107,40 @@
           iow[i] = iow[sz - 1]; iow.pop_back ();
           pfs[i] = pfs[sz - 1]; pfs.pop_back ();
         }
+
+      w->p = 0;
     }
 }
 
+void io_manager::reschedule_time_watchers ()
+{
+  make_heap (tw.begin (), tw.end (), earliest_first);
+}
+
 void io_manager::reg (time_watcher *w)
 {
+  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 
-        {
-          if (i != sz - 1)
-            tw[i] = tw[sz - 1];
+      unsigned int sz = tw.size ();
+      unsigned int i = find (tw.begin (), tw.end (), w) - tw.begin ();
 
-          tw.pop_back ();
-          make_heap (tw.begin (), tw.end (), lowest_first);
-        }
+      assert (i != sz);
+      
+      if (i != sz - 1)
+        tw[i] = tw[sz - 1];
+
+      tw.pop_back ();
+      reschedule_time_watchers ();
+
+      w->registered = false;
     }
 }
 
@@ -112,7 +150,7 @@
 
   gettimeofday (&tv, 0);
 
-  NOW = (timestamp)tv.tv_sec + (timestamp)tv.tv_usec / 1000000;
+  NOW = (tstamp)tv.tv_sec + (tstamp)tv.tv_usec / 1000000;
 }
 
 void io_manager::loop ()
@@ -121,41 +159,60 @@
 
   for (;;)
     {
-      int timeout = tw.empty () ? -1 : (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 <%f<%f<\n", pfs.size (), timeout, tw.size (), tw[0]->at - NOW, tw[1]->at - NOW);
+          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);
-          time_watcher *w = tw[tw.size () - 1];
-          w->call (w->at);
-          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 ()
 {
+  iom_valid = true;
+
   set_now ();
+  idle = new time_watcher (this, &io_manager::idle_cb);
+  idle->start (0);
 }
 
 io_manager::~io_manager ()
 {
-  //
+  iom_valid = false;
 }