*** empty log message ***

ev.c

@@ -3,6 +3,7 @@
 #include <unistd.h>
 #include <fcntl.h>
 #include <signal.h>
+#include <stddef.h>
 
 #include <stdio.h>
 
@@ -127,10 +128,13 @@ static int pendingmax, pendingcnt;
 static void
 event (W w, int events)
 {
-  w->pending = ++pendingcnt;
-  array_needsize (pendings, pendingmax, pendingcnt, );
-  pendings [pendingcnt - 1].w      = w;
-  pendings [pendingcnt - 1].events = events;
+  if (w->active)
+    {
+      w->pending = ++pendingcnt;
+      array_needsize (pendings, pendingmax, pendingcnt, );
+      pendings [pendingcnt - 1].w      = w;
+      pendings [pendingcnt - 1].events = events;
+    }
 }
 
 static void
@@ -408,6 +412,8 @@ timers_reify ()
     {
       struct ev_timer *w = timers [0];
 
+      event ((W)w, EV_TIMEOUT);
+
       /* first reschedule or stop timer */
       if (w->repeat)
         {
@@ -417,8 +423,6 @@ timers_reify ()
         }
       else
         evtimer_stop (w); /* nonrepeating: stop timer */
-
-      event ((W)w, EV_TIMEOUT);
     }
 }
 
@@ -600,19 +604,25 @@ wlist_del (WL *head, WL elem)
     }
 }
 
+static void
+ev_clear (W w)
+{
+  if (w->pending)
+    {
+      pendings [w->pending - 1].w = 0;
+      w->pending = 0;
+    }
+}
+
 static void
 ev_start (W w, int active)
 {
-  w->pending = 0;
   w->active = active;
 }
 
 static void
 ev_stop (W w)
 {
-  if (w->pending)
-    pendings [w->pending - 1].w = 0;
-
   w->active = 0;
 }
 
@@ -638,6 +648,7 @@ evio_start (struct ev_io *w)
 void
 evio_stop (struct ev_io *w)
 {
+  ev_clear ((W)w);
   if (!ev_is_active (w))
     return;
 
@@ -649,7 +660,6 @@ evio_stop (struct ev_io *w)
   fdchanges [fdchangecnt - 1] = w->fd;
 }
 
-
 void
 evtimer_start (struct ev_timer *w)
 {
@@ -669,6 +679,7 @@ evtimer_start (struct ev_timer *w)
 void
 evtimer_stop (struct ev_timer *w)
 {
+  ev_clear ((W)w);
   if (!ev_is_active (w))
     return;
 
@@ -721,6 +732,7 @@ evperiodic_start (struct ev_periodic *w)
 void
 evperiodic_stop (struct ev_periodic *w)
 {
+  ev_clear ((W)w);
   if (!ev_is_active (w))
     return;
 
@@ -756,6 +768,7 @@ evsignal_start (struct ev_signal *w)
 void
 evsignal_stop (struct ev_signal *w)
 {
+  ev_clear ((W)w);
   if (!ev_is_active (w))
     return;
 
@@ -778,6 +791,10 @@ void evidle_start (struct ev_idle *w)
 
 void evidle_stop (struct ev_idle *w)
 {
+  ev_clear ((W)w);
+  if (ev_is_active (w))
+    return;
+
   idles [w->active - 1] = idles [--idlecnt];
   ev_stop ((W)w);
 }
@@ -794,12 +811,81 @@ void evcheck_start (struct ev_check *w)
 
 void evcheck_stop (struct ev_check *w)
 {
+  ev_clear ((W)w);
+  if (ev_is_active (w))
+    return;
+
   checks [w->active - 1] = checks [--checkcnt];
   ev_stop ((W)w);
 }
 
 /*****************************************************************************/
 
+struct ev_once
+{
+  struct ev_io io;
+  struct ev_timer to;
+  void (*cb)(int revents, void *arg);
+  void *arg;
+};
+
+static void
+once_cb (struct ev_once *once, int revents)
+{
+  void (*cb)(int revents, void *arg) = once->cb;
+  void *arg = once->arg;
+
+  evio_stop (&once->io);
+  evtimer_stop (&once->to);
+  free (once);
+
+  cb (revents, arg);
+}
+
+static void
+once_cb_io (struct ev_io *w, int revents)
+{
+  once_cb ((struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
+}
+
+static void
+once_cb_to (struct ev_timer *w, int revents)
+{
+  once_cb ((struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
+}
+
+void
+ev_once (int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
+{
+  struct ev_once *once = malloc (sizeof (struct ev_once));
+
+  if (!once)
+    cb (EV_ERROR, arg);
+  else
+    {
+      once->cb  = cb;
+      once->arg = arg;
+
+      evw_init (&once->io, once_cb_io);
+
+      if (fd >= 0)
+        {
+          evio_set (&once->io, fd, events);
+          evio_start (&once->io);
+        }
+
+      evw_init (&once->to, once_cb_to);
+
+      if (timeout >= 0.)
+        {
+          evtimer_set (&once->to, timeout, 0.);
+          evtimer_start (&once->to);
+        }
+    }
+}
+
+/*****************************************************************************/
+
 #if 0
 
 struct ev_io wio;

ev.h

@@ -12,11 +12,15 @@ typedef double ev_tstamp;
 #define EV_SIGNAL  0x08
 #define EV_IDLE    0x10
 #define EV_CHECK   0x20
+#define EV_ERROR   (0x3f|0x80)
 
 /* can be used to add custom fields to all watchers */
 #ifndef EV_COMMON
 # define EV_COMMON void *data
 #endif
+#ifndef EV_PROTOTYPES
+# define EV_PROTOTYPES 1
+#endif
 
 /*
  * struct member types:
@@ -103,8 +107,9 @@ struct ev_check
 #define EVMETHOD_NONE   0
 #define EVMETHOD_SELECT 1
 #define EVMETHOD_EPOLL  2
-int ev_init (int flags); /* returns ev_method */
+#if EV_PROTOTYPES
 extern int ev_method;
+int ev_init (int flags); /* returns ev_method */
 
 /* these three calls are suitable for plugging into pthread_atfork */
 void ev_prefork (void);
@@ -113,22 +118,29 @@ void ev_postfork_child (void);
 
 extern ev_tstamp ev_now; /* time w.r.t. timers and the eventloop, updated after each poll */
 ev_tstamp ev_time (void);
+#endif
 
 #define EVLOOP_NONBLOCK	1 /* do not block/wait */
 #define EVLOOP_ONESHOT	2 /* block *once* only */
+#if EV_PROTOTYPES
 void ev_loop (int flags);
 extern int ev_loop_done; /* set to 1 to break out of event loop, set to 2 to break out of all event loops */
 
+/* convinience function, wait for a single event, without registering an event watcher */
+/* if timeout is < 0, do wait indefinitely */
+void ev_once (int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg);
+#endif
+
 /* these may evaluate ev multiple times, and the other arguments at most once */
 /* either use evw_init + evXXX_set, or the evXXX_init macro, below, to first initialise a watcher */
-#define evw_init(ev,cb_)                   do { (ev)->active = 0; (ev)->cb = (cb_); } while (0)
+#define evw_init(ev,cb_)                   do { (ev)->active = 0; (ev)->pending = 0; (ev)->cb = (cb_); } while (0)
 
 #define evio_set(ev,fd_,events_)           do { (ev)->fd = (fd_); (ev)->events = (events_); } while (0)
 #define evtimer_set(ev,after_,repeat_)     do { (ev)->at = (after_); (ev)->repeat = (repeat_); } while (0)
 #define evperiodic_set(ev,at_,interval_)   do { (ev)->at = (at_); (ev)->interval = (interval_); } while (0)
 #define evsignal_set(ev,signum_)           do { (ev)->signum = (signum_); } while (0)
-#define evcheck_set(ev)                    /* nop, yes this is a serious in-joke */
-#define evidle_set(ev)                     /* nop, yes this is a serious in-joke */
+#define evcheck_set(ev)                    /* nop, yes, this is a serious in-joke */
+#define evidle_set(ev)                     /* nop, yes, this is a serious in-joke */
 
 #define evio_init(ev,cb,fd,events)         do { evw_init ((ev), (cb)); evio_set ((ev),(fd),(events)); } while (0)
 #define evtimer_init(ev,cb,after,repeat)   do { evw_init ((ev), (cb)); evtimer_set ((ev),(after),(repeat)); } while (0)
@@ -141,6 +153,7 @@ extern int ev_loop_done; /* set to 1 to break out of event loop, set to 2 to bre
 
 /* stopping (enabling, adding) a watcher does nothing if it is already running */
 /* stopping (disabling, deleting) a watcher does nothing unless its already running */
+#if EV_PROTOTYPES
 void evio_start       (struct ev_io *w);
 void evio_stop        (struct ev_io *w);
 
@@ -159,6 +172,7 @@ void evidle_stop      (struct ev_idle *w);
 
 void evcheck_start    (struct ev_check *w);
 void evcheck_stop     (struct ev_check *w);
+#endif
 
 #endif