minor kqueue optimisation

[software/libev.git] / ev.h

diff --git a/ev.h b/ev.h
index 1e88f025120e793166c55d4d45d84e27705555a2..8fa7af357fcfbc42e0e37c0564bec344e3625a1c 100644 (file)
--- a/ev.h
+++ b/ev.h
@@ -27,8 +27,8 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 

-#ifndef EV_H
-#define EV_H
+#ifndef EV_H__
+#define EV_H__

 
 #ifdef __cplusplus
 extern "C" {
 
 #ifdef __cplusplus
 extern "C" {


@@ -44,23 +44,49 @@ typedef double ev_tstamp;
 # define EV_MAXPRI +2
 #endif
 
 # define EV_MAXPRI +2
 #endif
 

+#ifndef EV_MULTIPLICITY
+# define EV_MULTIPLICITY 1
+#endif
+
+#ifndef EV_PERIODICS
+# define EV_PERIODICS 1
+#endif
+
+/* support multiple event loops? */
+#if EV_MULTIPLICITY
+struct ev_loop;
+# define EV_P struct ev_loop *loop
+# define EV_P_ EV_P,
+# define EV_A loop
+# define EV_A_ EV_A,
+# define EV_DEFAULT_A ev_default_loop (0)
+# define EV_DEFAULT_A_ EV_DEFAULT_A,
+#else
+# define EV_P void
+# define EV_P_
+# define EV_A
+# define EV_A_
+# define EV_DEFAULT_A
+# define EV_DEFAULT_A_
+#endif
+

 /* eventmask, revents, events... */
 /* eventmask, revents, events... */

-#define EV_UNDEF          -1 /* guaranteed to be invalid */
-#define EV_NONE         0x00
-#define EV_READ         0x01
-#define EV_WRITE        0x02
-#define EV_TIMEOUT  0x000100
-#define EV_PERIODIC 0x000200
-#define EV_SIGNAL   0x000400
-#define EV_IDLE     0x000800
-#define EV_CHECK    0x001000
-#define EV_PREPARE  0x002000
-#define EV_CHILD    0x004000
-#define EV_ERROR    0x800000 /* sent when an error occurs */
-
-/* can be used to add custom fields to all watchers */
+#define EV_UNDEF          -1L /* guaranteed to be invalid */
+#define EV_NONE         0x00L 
+#define EV_READ         0x01L /* io only */
+#define EV_WRITE        0x02L /* io only */
+#define EV_TIMEOUT  0x000100L /* timer only */
+#define EV_PERIODIC 0x000200L /* periodic timer only */
+#define EV_SIGNAL   0x000400L /* signal only */
+#define EV_IDLE     0x000800L /* idle only */
+#define EV_CHECK    0x001000L /* check only */
+#define EV_PREPARE  0x002000L /* prepare only */
+#define EV_CHILD    0x004000L /* child/pid only */
+#define EV_ERROR    0x800000L /* sent when an error occurs */
+
+/* can be used to add custom fields to all watchers, while losing binary compatibility */

 #ifndef EV_COMMON
 #ifndef EV_COMMON

-# define EV_COMMON void *data
+# define EV_COMMON void *data;

 #endif
 #ifndef EV_PROTOTYPES
 # define EV_PROTOTYPES 1
 #endif
 #ifndef EV_PROTOTYPES
 # define EV_PROTOTYPES 1


@@ -69,6 +95,13 @@ typedef double ev_tstamp;
 #define EV_VERSION_MAJOR 1
 #define EV_VERSION_MINOR 1
 
 #define EV_VERSION_MAJOR 1
 #define EV_VERSION_MINOR 1
 

+#ifndef EV_CB_DECLARE
+# define EV_CB_DECLARE(type) void (*cb)(EV_P_ struct type *w, int revents);
+#endif
+#ifndef EV_CB_INVOKE
+# define EV_CB_INVOKE(watcher,revents) (watcher)->cb (EV_A_ (watcher), (revents))
+#endif
+

 /*
  * struct member types:
  * private: you can look at them, but not change them, and they might not mean anything to you.
 /*
  * struct member types:
  * private: you can look at them, but not change them, and they might not mean anything to you.


@@ -80,38 +113,41 @@ typedef double ev_tstamp;
 #define EV_WATCHER(type)                       \
   int active; /* private */                    \
   int pending; /* private */                   \
 #define EV_WATCHER(type)                       \
   int active; /* private */                    \
   int pending; /* private */                   \

-  int priority; /* ro */                       \
-  EV_COMMON; /* rw */                          \
-  void (*cb)(struct type *, int revents); /* rw */ /* gets invoked with an eventmask */
+  int priority; /* private */                  \
+  EV_COMMON /* rw */                           \
+  EV_CB_DECLARE (type) /* private */

 
 #define EV_WATCHER_LIST(type)                  \
 
 #define EV_WATCHER_LIST(type)                  \

-  EV_WATCHER (type);                           \
-  struct type *next /* private */
+  EV_WATCHER (type)                            \
+  struct ev_watcher_list *next; /* private */

 
 #define EV_WATCHER_TIME(type)                  \
 
 #define EV_WATCHER_TIME(type)                  \

-  EV_WATCHER (type);                           \
-  ev_tstamp at     /* private */
+  EV_WATCHER (type)                            \
+  ev_tstamp at;     /* private */

 
 /* base class, nothing to see here unless you subclass */
 
 /* base class, nothing to see here unless you subclass */

-struct ev_watcher {
-  EV_WATCHER (ev_watcher);
+struct ev_watcher
+{
+  EV_WATCHER (ev_watcher)

 };
 
 /* base class, nothing to see here unless you subclass */
 };
 
 /* base class, nothing to see here unless you subclass */

-struct ev_watcher_list {
-  EV_WATCHER_LIST (ev_watcher_list);
+struct ev_watcher_list
+{
+  EV_WATCHER_LIST (ev_watcher_list)

 };
 
 /* base class, nothing to see here unless you subclass */
 };
 
 /* base class, nothing to see here unless you subclass */

-struct ev_watcher_time {
-  EV_WATCHER_TIME (ev_watcher_time);
+struct ev_watcher_time
+{
+  EV_WATCHER_TIME (ev_watcher_time)

 };
 
 /* invoked after a specific time, repeatable (based on monotonic clock) */
 /* revent EV_TIMEOUT */
 struct ev_timer
 {
 };
 
 /* invoked after a specific time, repeatable (based on monotonic clock) */
 /* revent EV_TIMEOUT */
 struct ev_timer
 {

-  EV_WATCHER_TIME (ev_timer);
+  EV_WATCHER_TIME (ev_timer)

 
   ev_tstamp repeat; /* rw */
 };
 
   ev_tstamp repeat; /* rw */
 };


@@ -120,16 +156,17 @@ struct ev_timer
 /* revent EV_PERIODIC */
 struct ev_periodic
 {
 /* revent EV_PERIODIC */
 struct ev_periodic
 {

-  EV_WATCHER_TIME (ev_periodic);
+  EV_WATCHER_TIME (ev_periodic)

 
   ev_tstamp interval; /* rw */
 
   ev_tstamp interval; /* rw */

+  ev_tstamp (*reschedule_cb)(struct ev_periodic *w, ev_tstamp now); /* rw */

 };
 
 /* invoked when fd is either EV_READable or EV_WRITEable */
 /* revent EV_READ, EV_WRITE */
 struct ev_io
 {
 };
 
 /* invoked when fd is either EV_READable or EV_WRITEable */
 /* revent EV_READ, EV_WRITE */
 struct ev_io
 {

-  EV_WATCHER_LIST (ev_io);
+  EV_WATCHER_LIST (ev_io)

 
   int fd;     /* ro */
   int events; /* ro */
 
   int fd;     /* ro */
   int events; /* ro */


@@ -139,7 +176,7 @@ struct ev_io
 /* revent EV_SIGNAL */
 struct ev_signal
 {
 /* revent EV_SIGNAL */
 struct ev_signal
 {

-  EV_WATCHER_LIST (ev_signal);
+  EV_WATCHER_LIST (ev_signal)

 
   int signum; /* ro */
 };
 
   int signum; /* ro */
 };


@@ -148,7 +185,7 @@ struct ev_signal
 /* revent EV_IDLE */
 struct ev_idle
 {
 /* revent EV_IDLE */
 struct ev_idle
 {

-  EV_WATCHER (ev_idle);
+  EV_WATCHER (ev_idle)

 };
 
 /* invoked for each run of the mainloop, just before the blocking call */
 };
 
 /* invoked for each run of the mainloop, just before the blocking call */


@@ -156,114 +193,225 @@ struct ev_idle
 /* revent EV_PREPARE */
 struct ev_prepare
 {
 /* revent EV_PREPARE */
 struct ev_prepare
 {

-  EV_WATCHER (ev_prepare);
+  EV_WATCHER (ev_prepare)

 };
 
 /* invoked for each run of the mainloop, just after the blocking call */
 /* revent EV_CHECK */
 struct ev_check
 {
 };
 
 /* invoked for each run of the mainloop, just after the blocking call */
 /* revent EV_CHECK */
 struct ev_check
 {

-  EV_WATCHER (ev_check);
+  EV_WATCHER (ev_check)

 };
 
 };
 

-/* invoked when sigchld is received and waitpid indicates the givne pid */
+/* invoked when sigchld is received and waitpid indicates the given pid */

 /* revent EV_CHILD */
 /* does not support priorities */
 struct ev_child
 {
 /* revent EV_CHILD */
 /* does not support priorities */
 struct ev_child
 {

-  EV_WATCHER_LIST (ev_child);
+  EV_WATCHER_LIST (ev_child)

 
   int pid;     /* ro */
   int rpid;    /* rw, holds the received pid */
   int rstatus; /* rw, holds the exit status, use the macros from sys/wait.h */
 };
 
 
   int pid;     /* ro */
   int rpid;    /* rw, holds the received pid */
   int rstatus; /* rw, holds the exit status, use the macros from sys/wait.h */
 };
 

-#define EVMETHOD_AUTO     0 /* consults environment */
-#define EVMETHOD_SELECT   1
-#define EVMETHOD_POLL     2
-#define EVMETHOD_EPOLL    4
-#define EVMETHOD_KQUEUE   8
-#define EVMETHOD_DEVPOLL 16 /* NYI */
-#define EVMETHOD_PORT    32 /* NYI */
-#define EVMETHOD_ANY     ~0 /* any method, do not consult env */
+/* the presence of this union forces similar struct layout */
+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_idle idle;
+  struct ev_prepare prepare;
+  struct ev_check check;
+  struct ev_signal signal;
+  struct ev_child child;
+};
+
+/* bits for ev_default_loop and ev_loop_new */
+/* the default */
+#define EVFLAG_AUTO       0x00000000UL /* not quite a mask */
+/* flag bits */
+#define EVFLAG_NOENV      0x01000000UL /* do NOT consult environment */
+/* method bits to be ored together */
+#define EVBACKEND_SELECT  0x00000001UL /* about anywhere */
+#define EVBACKEND_POLL    0x00000002UL /* !win */
+#define EVBACKEND_EPOLL   0x00000004UL /* linux */
+#define EVBACKEND_KQUEUE  0x00000008UL /* bsd */
+#define EVBACKEND_DEVPOLL 0x00000010UL /* solaris 8 */ /* NYI */
+#define EVBACKEND_PORT    0x00000020UL /* solaris 10 */
+

 #if EV_PROTOTYPES
 #if EV_PROTOTYPES

-extern int ev_method;
-int ev_init (int methods); /* returns ev_method */

 int ev_version_major (void);
 int ev_version_minor (void);
 
 int ev_version_major (void);
 int ev_version_minor (void);
 

-/* these three calls are suitable for plugging into pthread_atfork */
-void ev_fork_prepare (void);
-void ev_fork_parent (void);
-void ev_fork_child (void);
+unsigned int ev_supported_backends (void);
+unsigned int ev_recommended_backends (void);

 
 

-extern ev_tstamp ev_now; /* time w.r.t. timers and the eventloop, updated after each poll */

 ev_tstamp ev_time (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)(const char *msg));
+
+# 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 */
+static struct ev_loop *
+ev_default_loop (unsigned int flags)
+{
+  extern struct ev_loop *ev_default_loop_ptr;
+  extern struct ev_loop *ev_default_loop_init (unsigned int flags);
+
+  if (!ev_default_loop_ptr)
+    ev_default_loop_init (flags);
+
+  return ev_default_loop_ptr;
+}
+
+/* create and destroy alternative loops that don't handle signals */
+struct ev_loop *ev_loop_new (unsigned int flags);
+void ev_loop_destroy (EV_P);
+void ev_loop_fork (EV_P);
+
+ev_tstamp ev_now (EV_P); /* time w.r.t. timers and the eventloop, updated after each poll */
+
+# else
+
+int ev_default_loop (unsigned int flags); /* returns true when successful */
+
+static ev_tstamp
+ev_now (void)
+{
+  extern ev_tstamp ev_rt_now;
+
+  return ev_rt_now;
+}
+# endif
+
+void ev_default_destroy (void); /* destroy the default loop */
+/* this needs to be called after fork, to duplicate the default loop */
+/* if you create alternative loops you have to call ev_loop_fork on them */
+/* you can call it in either the parent or the child */
+/* you can actually call it at any time, anywhere :) */
+void ev_default_fork (void);
+
+unsigned int ev_backend (EV_P);

 #endif
 
 #define EVLOOP_NONBLOCK        1 /* do not block/wait */
 #define EVLOOP_ONESHOT 2 /* block *once* only */
 #endif
 
 #define EVLOOP_NONBLOCK        1 /* do not block/wait */
 #define EVLOOP_ONESHOT 2 /* block *once* only */

+#define EVUNLOOP_ONE    1 /* unloop once */
+#define EVUNLOOP_ALL    2 /* unloop all loops */
+

 #if EV_PROTOTYPES
 #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 */
+void ev_loop (EV_P_ int flags);
+void ev_unloop (EV_P_ int how); /* set to 1 to break out of event loop, set to 2 to break out of all event loops */
+
+/*
+ * ref/unref can be used to add or remove a refcount on the mainloop. every watcher
+ * keeps one reference. if you have a long-runing watcher you never unregister that
+ * should not keep ev_loop from running, unref() after starting, and ref() before stopping.
+ */
+void ev_ref   (EV_P);
+void ev_unref (EV_P);

 
 /* convinience function, wait for a single event, without registering an event watcher */
 /* if timeout is < 0, do wait indefinitely */
 
 /* 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);
+void ev_once (EV_P_ 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 */
 #endif
 
 /* 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)
+/* either use ev_init + ev_TYPE_set, or the ev_TYPE_init macro, below, to first initialise a watcher */
+#define ev_init(ev,cb_) do {                           \
+  ((struct ev_watcher *)(void *)(ev))->active   =      \
+  ((struct ev_watcher *)(void *)(ev))->pending  =      \
+  ((struct ev_watcher *)(void *)(ev))->priority = 0;   \
+  ev_set_cb ((ev), 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)
 
 #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)

-#define ev_periodic_set(ev,at_,interval_)   do { (ev)->at = (at_); (ev)->interval = (interval_); } while (0)
+#define ev_periodic_set(ev,at_,ival_,res_)  do { (ev)->at = (at_); (ev)->interval = (ival_); (ev)->reschedule_cb= (res_); } while (0)

 #define ev_signal_set(ev,signum_)           do { (ev)->signum = (signum_); } while (0)
 #define ev_idle_set(ev)                     /* nop, yes, this is a serious in-joke */
 #define ev_prepare_set(ev)                  /* nop, yes, this is a serious in-joke */
 #define ev_check_set(ev)                    /* nop, yes, this is a serious in-joke */
 #define ev_child_set(ev,pid_)               do { (ev)->pid = (pid_); } while (0)
 
 #define ev_signal_set(ev,signum_)           do { (ev)->signum = (signum_); } while (0)
 #define ev_idle_set(ev)                     /* nop, yes, this is a serious in-joke */
 #define ev_prepare_set(ev)                  /* nop, yes, this is a serious in-joke */
 #define ev_check_set(ev)                    /* nop, yes, this is a serious in-joke */
 #define ev_child_set(ev,pid_)               do { (ev)->pid = (pid_); } while (0)
 

-#define ev_io_init(ev,cb,fd,events)         do { ev_watcher_init ((ev), (cb)); ev_io_set ((ev),(fd),(events)); } while (0)
-#define ev_timer_init(ev,cb,after,repeat)   do { ev_watcher_init ((ev), (cb)); ev_timer_set ((ev),(after),(repeat)); } while (0)
-#define ev_periodic_init(ev,cb,at,interval) do { ev_watcher_init ((ev), (cb)); ev_periodic_set ((ev),(at),(interval)); } while (0)
-#define ev_signal_init(ev,cb,signum)        do { ev_watcher_init ((ev), (cb)); ev_signal_set ((ev), (signum)); } while (0)
-#define ev_idle_init(ev,cb)                 do { ev_watcher_init ((ev), (cb)); ev_idle_set ((ev)); } while (0)
-#define ev_prepare_init(ev,cb)              do { ev_watcher_init ((ev), (cb)); ev_prepare_set ((ev)); } while (0)
-#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_io_init(ev,cb,fd,events)         do { ev_init ((ev), (cb)); ev_io_set ((ev),(fd),(events)); } while (0)
+#define ev_timer_init(ev,cb,after,repeat)   do { ev_init ((ev), (cb)); ev_timer_set ((ev),(after),(repeat)); } while (0)
+#define ev_periodic_init(ev,cb,at,ival,res) do { ev_init ((ev), (cb)); ev_periodic_set ((ev),(at),(ival),(res)); } while (0)
+#define ev_signal_init(ev,cb,signum)        do { ev_init ((ev), (cb)); ev_signal_set ((ev), (signum)); } while (0)
+#define ev_idle_init(ev,cb)                 do { ev_init ((ev), (cb)); ev_idle_set ((ev)); } while (0)
+#define ev_prepare_init(ev,cb)              do { ev_init ((ev), (cb)); ev_prepare_set ((ev)); } while (0)
+#define ev_check_init(ev,cb)                do { ev_init ((ev), (cb)); ev_check_set ((ev)); } while (0)
+#define ev_child_init(ev,cb,pid)            do { ev_init ((ev), (cb)); ev_child_set ((ev),(pid)); } while (0)
+
+#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_is_active(ev)                    (0 + (ev)->active) /* true when the watcher has been started */
-#define ev_set_priority(ev,pri)             (ev)->priority = pri
+#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)
+
+#ifndef ev_set_cb
+# define ev_set_cb(ev,cb_)                  ev_cb (ev) = (cb_)
+#endif

 
 /* 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
 
 /* 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 ev_io_start       (struct ev_io *w);
-void ev_io_stop        (struct ev_io *w);

 
 

-void ev_timer_start    (struct ev_timer *w);
-void ev_timer_stop     (struct ev_timer *w);
-void ev_timer_again    (struct ev_timer *w); /* stops if active and no repeat, restarts if active and repeating, starts if inactive and repeating */
+/* feeds an event into a watcher as if the event actually occured */
+/* accepts any ev_watcher type */
+void ev_feed_event     (EV_P_ void *w, int revents);
+void ev_feed_fd_event  (EV_P_ int fd, int revents);
+void ev_feed_signal_event (EV_P_ int signum);
+
+void ev_io_start       (EV_P_ struct ev_io *w);
+void ev_io_stop        (EV_P_ struct ev_io *w);

 
 

-void ev_periodic_start (struct ev_periodic *w);
-void ev_periodic_stop  (struct ev_periodic *w);
+void ev_timer_start    (EV_P_ struct ev_timer *w);
+void ev_timer_stop     (EV_P_ struct ev_timer *w);
+/* stops if active and no repeat, restarts if active and repeating, starts if inactive and repeating */
+void ev_timer_again    (EV_P_ struct ev_timer *w);
+
+#if EV_PERIODICS
+void ev_periodic_start (EV_P_ struct ev_periodic *w);
+void ev_periodic_stop  (EV_P_ struct ev_periodic *w);
+void ev_periodic_again (EV_P_ struct ev_periodic *w);
+#endif

 
 

-void ev_signal_start   (struct ev_signal *w);
-void ev_signal_stop    (struct ev_signal *w);
+void ev_idle_start     (EV_P_ struct ev_idle *w);
+void ev_idle_stop      (EV_P_ struct ev_idle *w);

 
 

-void ev_idle_start     (struct ev_idle *w);
-void ev_idle_stop      (struct ev_idle *w);
+void ev_prepare_start  (EV_P_ struct ev_prepare *w);
+void ev_prepare_stop   (EV_P_ struct ev_prepare *w);

 
 

-void ev_prepare_start  (struct ev_prepare *w);
-void ev_prepare_stop   (struct ev_prepare *w);
+void ev_check_start    (EV_P_ struct ev_check *w);
+void ev_check_stop     (EV_P_ struct ev_check *w);

 
 

-void ev_check_start    (struct ev_check *w);
-void ev_check_stop     (struct ev_check *w);
+/* only supported in the default loop */
+void ev_signal_start   (EV_P_ struct ev_signal *w);
+void ev_signal_stop    (EV_P_ struct ev_signal *w);

 
 

-void ev_child_start    (struct ev_child *w);
-void ev_child_stop     (struct ev_child *w);
+/* only supported in the default loop */
+void ev_child_start    (EV_P_ struct ev_child *w);
+void ev_child_stop     (EV_P_ struct ev_child *w);

 #endif
 
 #ifdef __cplusplus
 #endif
 
 #ifdef __cplusplus