better error handling

[software/libev.git] / ev.h

diff --git a/ev.h b/ev.h
index 5a9462c408a4892a75e438b0b725b79c0eb26e33..08b5963e631abfae28e454b8aa2979d2e705fa38 100644 (file)
--- a/ev.h
+++ b/ev.h
@@ -98,9 +98,9 @@ struct ev_loop;
 #define EV_WATCHER(type)                       \
   int active; /* private */                    \
   int pending; /* private */                   \
-  int priority; /* ro */                       \
+  int priority; /* private */                  \
   EV_COMMON; /* rw */                          \
-  void (*cb)(EV_P_ struct type *, int revents); /* rw */ /* gets invoked with an eventmask */
+  void (*cb)(EV_P_ struct type *, int revents); /* private */ /* gets invoked with an eventmask */
 
 #define EV_WATCHER_LIST(type)                  \
   EV_WATCHER (type);                           \
@@ -199,6 +199,20 @@ struct ev_child
   int rstatus; /* rw, holds the exit status, use the macros from sys/wait.h */
 };
 
+union ev_any_watcher
+{
+  struct ev_watcher w;
+  struct ev_watcher_list wl;
+  struct ev_io io;
+  struct ev_timer timer;
+  struct ev_periodic periodic;
+  struct ev_signal signal;
+  struct ev_idle idle;
+  struct ev_child child;
+  struct ev_prepare prepare;
+  struct ev_check check;
+};
+
 #define EVMETHOD_AUTO     0 /* consults environment */
 #define EVMETHOD_SELECT   1
 #define EVMETHOD_POLL     2
@@ -206,6 +220,7 @@ struct ev_child
 #define EVMETHOD_KQUEUE   8
 #define EVMETHOD_DEVPOLL 16 /* NYI */
 #define EVMETHOD_PORT    32 /* NYI */
+#define EVMETHOD_WIN32   64 /* NYI */
 #define EVMETHOD_ANY     ~0 /* any method, do not consult env */
 
 #if EV_PROTOTYPES
@@ -214,6 +229,20 @@ int ev_version_minor (void);
 
 ev_tstamp ev_time (void);
 
+/* Sets the allocation function to use, works like realloc.
+ * It is used to allocate and free memory.
+ * If it returns zero when memory needs to be allocated, the library might abort
+ * or take some potentially destructive action.
+ * The default is your system realloc function.
+ */
+void ev_set_allocator (void *(*cb)(void *ptr, long size));
+
+/* set the callback function to call on a
+ * retryable syscall error
+ * (such as failed select, poll, epoll_wait)
+ */
+void ev_set_syserr_cb (void (*cb)(void));
+
 # if EV_MULTIPLICITY
 /* the default loop is the only one that handles signals and child watchers */
 /* you can call this as often as you like */
@@ -263,7 +292,12 @@ void ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revent
 
 /* these may evaluate ev multiple times, and the other arguments at most once */
 /* either use ev_watcher_init + ev_TYPE_set, or the ev_TYPE_init macro, below, to first initialise a watcher */
-#define ev_watcher_init(ev,cb_)             do { (ev)->active = (ev)->pending = (ev)->priority = 0; (ev)->cb = (cb_); } while (0)
+#define ev_watcher_init(ev,cb_) do {           \
+  ((struct ev_watcher *)(void *)(ev))->active   =      \
+  ((struct ev_watcher *)(void *)(ev))->pending  =      \
+  ((struct ev_watcher *)(void *)(ev))->priority = 0;   \
+  (ev)->cb = (cb_);                            \
+} while (0)
 
 #define ev_io_set(ev,fd_,events_)           do { (ev)->fd = (fd_); (ev)->events = (events_); } while (0)
 #define ev_timer_set(ev,after_,repeat_)     do { (ev)->at = (after_); (ev)->repeat = (repeat_); } while (0)
@@ -283,8 +317,13 @@ void ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revent
 #define ev_check_init(ev,cb)                do { ev_watcher_init ((ev), (cb)); ev_check_set ((ev)); } while (0)
 #define ev_child_init(ev,cb,pid)            do { ev_watcher_init ((ev), (cb)); ev_child_set ((ev),(pid)); } while (0)
 
-#define ev_is_active(ev)                    (0 + (ev)->active) /* true when the watcher has been started */
-#define ev_set_priority(ev,pri)             (ev)->priority = pri
+#define ev_is_pending(ev)                   (0 + ((struct ev_watcher *)(void *)(ev))->pending) /* ro, true when watcher is waiting for callback invocation */
+#define ev_is_active(ev)                    (0 + ((struct ev_watcher *)(void *)(ev))->active) /* ro, true when the watcher has been started */
+
+#define ev_priority(ev)                     ((struct ev_watcher *)(void *)(ev))->priority /* rw */
+#define ev_cb(ev)                           (ev)->cb /* rw */
+#define ev_set_priority(ev,pri)             ev_priority (ev) = (pri)
+#define ev_set_cb(ev,cb_)                   ev_cb (ev) = (cb_)
 
 /* stopping (enabling, adding) a watcher does nothing if it is already running */
 /* stopping (disabling, deleting) a watcher does nothing unless its already running */