+/*
+ * libev event processing core, watcher management
+ *
+ * Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials provided
+ * with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+#ifndef EV_STANDALONE
+# include "config.h"
+
+# if HAVE_CLOCK_GETTIME
+# define EV_USE_MONOTONIC 1
+# define EV_USE_REALTIME 1
+# endif
+
+# if HAVE_SELECT && HAVE_SYS_SELECT_H
+# define EV_USE_SELECT 1
+# endif
+
+# if HAVE_POLL && HAVE_POLL_H
+# define EV_USE_POLL 1
+# endif
+
+# if HAVE_EPOLL && HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
+# define EV_USE_EPOLL 1
+# endif
+
+# if HAVE_KQUEUE && HAVE_WORKING_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H
+# define EV_USE_KQUEUE 1
+# endif
+
+#endif
+
#include <math.h>
#include <stdlib.h>
+#include <fcntl.h>
+#include <stddef.h>
#include <stdio.h>
#include <assert.h>
#include <errno.h>
-#include <sys/time.h>
+#include <sys/types.h>
#include <time.h>
-#ifdef CLOCK_MONOTONIC
-# define HAVE_MONOTONIC 1
+#include <signal.h>
+
+#ifndef WIN32
+# include <unistd.h>
+# include <sys/time.h>
+# include <sys/wait.h>
+#endif
+/**/
+
+#ifndef EV_USE_MONOTONIC
+# define EV_USE_MONOTONIC 1
+#endif
+
+#ifndef EV_USE_SELECT
+# define EV_USE_SELECT 1
+#endif
+
+#ifndef EV_USE_POLL
+# define EV_USE_POLL 0 /* poll is usually slower than select, and not as well tested */
+#endif
+
+#ifndef EV_USE_EPOLL
+# define EV_USE_EPOLL 0
+#endif
+
+#ifndef EV_USE_KQUEUE
+# define EV_USE_KQUEUE 0
+#endif
+
+#ifndef EV_USE_WIN32
+# ifdef WIN32
+# define EV_USE_WIN32 0 /* it does not exist, use select */
+# undef EV_USE_SELECT
+# define EV_USE_SELECT 1
+# else
+# define EV_USE_WIN32 0
+# endif
#endif
-#define HAVE_EPOLL 1
-#define HAVE_REALTIME 1
-#define HAVE_SELECT 0
+#ifndef EV_USE_REALTIME
+# define EV_USE_REALTIME 1
+#endif
+
+/**/
+
+#ifndef CLOCK_MONOTONIC
+# undef EV_USE_MONOTONIC
+# define EV_USE_MONOTONIC 0
+#endif
+
+#ifndef CLOCK_REALTIME
+# undef EV_USE_REALTIME
+# define EV_USE_REALTIME 0
+#endif
+
+/**/
#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
-#define MAX_BLOCKTIME 60.
+#define MAX_BLOCKTIME 59.731 /* never wait longer than this time (to detect time jumps) */
+#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
+/*#define CLEANUP_INTERVAL 300. /* how often to try to free memory and re-check fds */
#include "ev.h"
-struct ev_watcher {
- EV_WATCHER (ev_watcher);
-};
+#if __GNUC__ >= 3
+# define expect(expr,value) __builtin_expect ((expr),(value))
+# define inline inline
+#else
+# define expect(expr,value) (expr)
+# define inline static
+#endif
+
+#define expect_false(expr) expect ((expr) != 0, 0)
+#define expect_true(expr) expect ((expr) != 0, 1)
+
+#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
+#define ABSPRI(w) ((w)->priority - EV_MINPRI)
+
+typedef struct ev_watcher *W;
+typedef struct ev_watcher_list *WL;
+typedef struct ev_watcher_time *WT;
+
+static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
+
+#include "ev_win32.c"
+
+/*****************************************************************************/
+
+static void (*syserr_cb)(const char *msg);
+
+void ev_set_syserr_cb (void (*cb)(const char *msg))
+{
+ syserr_cb = cb;
+}
+
+static void
+syserr (const char *msg)
+{
+ if (!msg)
+ msg = "(libev) system error";
+
+ if (syserr_cb)
+ syserr_cb (msg);
+ else
+ {
+ perror (msg);
+ abort ();
+ }
+}
+
+static void *(*alloc)(void *ptr, long size);
+
+void ev_set_allocator (void *(*cb)(void *ptr, long size))
+{
+ alloc = cb;
+}
+
+static void *
+ev_realloc (void *ptr, long size)
+{
+ ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
+
+ if (!ptr && size)
+ {
+ fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
+ abort ();
+ }
+
+ return ptr;
+}
+
+#define ev_malloc(size) ev_realloc (0, (size))
+#define ev_free(ptr) ev_realloc ((ptr), 0)
+
+/*****************************************************************************/
+
+typedef struct
+{
+ WL head;
+ unsigned char events;
+ unsigned char reify;
+} ANFD;
+
+typedef struct
+{
+ W w;
+ int events;
+} ANPENDING;
-struct ev_watcher_list {
- EV_WATCHER_LIST (ev_watcher_list);
+#if EV_MULTIPLICITY
+
+struct ev_loop
+{
+# define VAR(name,decl) decl;
+# include "ev_vars.h"
};
+# undef VAR
+# include "ev_wrap.h"
+
+#else
-static ev_tstamp now, diff; /* monotonic clock */
-ev_tstamp ev_now;
-int ev_method;
+# define VAR(name,decl) static decl;
+# include "ev_vars.h"
+# undef VAR
-static int have_monotonic; /* runtime */
+#endif
-static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */
-static void (*method_reify)(void);
-static void (*method_poll)(ev_tstamp timeout);
+/*****************************************************************************/
-ev_tstamp
+inline ev_tstamp
ev_time (void)
{
-#if HAVE_REALTIME
+#if EV_USE_REALTIME
struct timespec ts;
clock_gettime (CLOCK_REALTIME, &ts);
return ts.tv_sec + ts.tv_nsec * 1e-9;
#endif
}
-static ev_tstamp
+inline ev_tstamp
get_clock (void)
{
-#if HAVE_MONOTONIC
- if (have_monotonic)
+#if EV_USE_MONOTONIC
+ if (expect_true (have_monotonic))
{
struct timespec ts;
clock_gettime (CLOCK_MONOTONIC, &ts);
return ev_time ();
}
-#define array_needsize(base,cur,cnt,init) \
- if ((cnt) > cur) \
- { \
- int newcnt = cur ? cur << 1 : 16; \
- fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\
- base = realloc (base, sizeof (*base) * (newcnt)); \
- init (base + cur, newcnt - cur); \
- cur = newcnt; \
+ev_tstamp
+ev_now (EV_P)
+{
+ return rt_now;
+}
+
+#define array_roundsize(type,n) ((n) | 4 & ~3)
+
+#define array_needsize(type,base,cur,cnt,init) \
+ if (expect_false ((cnt) > cur)) \
+ { \
+ int newcnt = cur; \
+ do \
+ { \
+ newcnt = array_roundsize (type, newcnt << 1); \
+ } \
+ while ((cnt) > newcnt); \
+ \
+ base = (type *)ev_realloc (base, sizeof (type) * (newcnt));\
+ init (base + cur, newcnt - cur); \
+ cur = newcnt; \
}
-typedef struct
-{
- struct ev_io *head;
- unsigned char wev, rev; /* want, received event set */
-} ANFD;
+#define array_slim(type,stem) \
+ if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
+ { \
+ stem ## max = array_roundsize (stem ## cnt >> 1); \
+ base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
+ fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
+ }
+
+/* microsoft's pseudo-c is quite far from C as the rest of the world and the standard knows it */
+/* bringing us everlasting joy in form of stupid extra macros that are not required in C */
+#define array_free_microshit(stem) \
+ ev_free (stem ## s); stem ## cnt = stem ## max = 0;
-static ANFD *anfds;
-static int anfdmax;
+#define array_free(stem, idx) \
+ ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
-static int *fdchanges;
-static int fdchangemax, fdchangecnt;
+/*****************************************************************************/
static void
anfds_init (ANFD *base, int count)
{
while (count--)
{
- base->head = 0;
- base->wev = base->rev = EV_NONE;
+ base->head = 0;
+ base->events = EV_NONE;
+ base->reify = 0;
+
++base;
}
}
-typedef struct
+static void
+event (EV_P_ W w, int events)
{
- struct ev_watcher *w;
- int events;
-} ANPENDING;
+ if (w->pending)
+ {
+ pendings [ABSPRI (w)][w->pending - 1].events |= events;
+ return;
+ }
-static ANPENDING *pendings;
-static int pendingmax, pendingcnt;
+ w->pending = ++pendingcnt [ABSPRI (w)];
+ array_needsize (ANPENDING, pendings [ABSPRI (w)], pendingmax [ABSPRI (w)], pendingcnt [ABSPRI (w)], (void));
+ pendings [ABSPRI (w)][w->pending - 1].w = w;
+ pendings [ABSPRI (w)][w->pending - 1].events = events;
+}
static void
-event (struct ev_watcher *w, int events)
+queue_events (EV_P_ W *events, int eventcnt, int type)
{
- w->pending = ++pendingcnt;
- array_needsize (pendings, pendingmax, pendingcnt, );
- pendings [pendingcnt - 1].w = w;
- pendings [pendingcnt - 1].events = events;
+ int i;
+
+ for (i = 0; i < eventcnt; ++i)
+ event (EV_A_ events [i], type);
}
static void
-fd_event (int fd, int events)
+fd_event (EV_P_ int fd, int events)
{
ANFD *anfd = anfds + fd;
struct ev_io *w;
- for (w = anfd->head; w; w = w->next)
+ for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
{
int ev = w->events & events;
if (ev)
- event ((struct ev_watcher *)w, ev);
+ event (EV_A_ (W)w, ev);
+ }
+}
+
+/*****************************************************************************/
+
+static void
+fd_reify (EV_P)
+{
+ int i;
+
+ for (i = 0; i < fdchangecnt; ++i)
+ {
+ int fd = fdchanges [i];
+ ANFD *anfd = anfds + fd;
+ struct ev_io *w;
+
+ int events = 0;
+
+ for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
+ events |= w->events;
+
+ anfd->reify = 0;
+
+ method_modify (EV_A_ fd, anfd->events, events);
+ anfd->events = events;
+ }
+
+ fdchangecnt = 0;
+}
+
+static void
+fd_change (EV_P_ int fd)
+{
+ if (anfds [fd].reify)
+ return;
+
+ anfds [fd].reify = 1;
+
+ ++fdchangecnt;
+ array_needsize (int, fdchanges, fdchangemax, fdchangecnt, (void));
+ fdchanges [fdchangecnt - 1] = fd;
+}
+
+static void
+fd_kill (EV_P_ int fd)
+{
+ struct ev_io *w;
+
+ while ((w = (struct ev_io *)anfds [fd].head))
+ {
+ ev_io_stop (EV_A_ w);
+ event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
}
}
-static struct ev_timer **atimers;
-static int atimermax, atimercnt;
+static int
+fd_valid (int fd)
+{
+#ifdef WIN32
+ return !!win32_get_osfhandle (fd);
+#else
+ return fcntl (fd, F_GETFD) != -1;
+#endif
+}
+
+/* called on EBADF to verify fds */
+static void
+fd_ebadf (EV_P)
+{
+ int fd;
+
+ for (fd = 0; fd < anfdmax; ++fd)
+ if (anfds [fd].events)
+ if (!fd_valid (fd) == -1 && errno == EBADF)
+ fd_kill (EV_A_ fd);
+}
+
+/* called on ENOMEM in select/poll to kill some fds and retry */
+static void
+fd_enomem (EV_P)
+{
+ int fd;
+
+ for (fd = anfdmax; fd--; )
+ if (anfds [fd].events)
+ {
+ fd_kill (EV_A_ fd);
+ return;
+ }
+}
+
+/* usually called after fork if method needs to re-arm all fds from scratch */
+static void
+fd_rearm_all (EV_P)
+{
+ int fd;
+
+ /* this should be highly optimised to not do anything but set a flag */
+ for (fd = 0; fd < anfdmax; ++fd)
+ if (anfds [fd].events)
+ {
+ anfds [fd].events = 0;
+ fd_change (EV_A_ fd);
+ }
+}
-static struct ev_timer **rtimers;
-static int rtimermax, rtimercnt;
+/*****************************************************************************/
static void
-upheap (struct ev_timer **timers, int k)
+upheap (WT *heap, int k)
{
- struct ev_timer *w = timers [k];
+ WT w = heap [k];
- while (k && timers [k >> 1]->at > w->at)
+ while (k && heap [k >> 1]->at > w->at)
{
- timers [k] = timers [k >> 1];
- timers [k]->active = k + 1;
+ heap [k] = heap [k >> 1];
+ ((W)heap [k])->active = k + 1;
k >>= 1;
}
- timers [k] = w;
- timers [k]->active = k + 1;
+ heap [k] = w;
+ ((W)heap [k])->active = k + 1;
}
static void
-downheap (struct ev_timer **timers, int N, int k)
+downheap (WT *heap, int N, int k)
{
- struct ev_timer *w = timers [k];
+ WT w = heap [k];
while (k < (N >> 1))
{
int j = k << 1;
- if (j + 1 < N && timers [j]->at > timers [j + 1]->at)
+ if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
++j;
- if (w->at <= timers [j]->at)
+ if (w->at <= heap [j]->at)
break;
- timers [k] = timers [j];
- timers [k]->active = k + 1;
+ heap [k] = heap [j];
+ ((W)heap [k])->active = k + 1;
k = j;
}
- timers [k] = w;
- timers [k]->active = k + 1;
+ heap [k] = w;
+ ((W)heap [k])->active = k + 1;
}
-static struct ev_signal **signals;
+/*****************************************************************************/
+
+typedef struct
+{
+ WL head;
+ sig_atomic_t volatile gotsig;
+} ANSIG;
+
+static ANSIG *signals;
static int signalmax;
+static int sigpipe [2];
+static sig_atomic_t volatile gotsig;
+static struct ev_io sigev;
+
static void
-signals_init (struct ev_signal **base, int count)
+signals_init (ANSIG *base, int count)
{
while (count--)
- *base++ = 0;
+ {
+ base->head = 0;
+ base->gotsig = 0;
+
+ ++base;
+ }
}
-#if HAVE_EPOLL
-# include "ev_epoll.c"
+static void
+sighandler (int signum)
+{
+#if WIN32
+ signal (signum, sighandler);
#endif
-#if HAVE_SELECT
-# include "ev_select.c"
+
+ signals [signum - 1].gotsig = 1;
+
+ if (!gotsig)
+ {
+ int old_errno = errno;
+ gotsig = 1;
+ write (sigpipe [1], &signum, 1);
+ errno = old_errno;
+ }
+}
+
+static void
+sigcb (EV_P_ struct ev_io *iow, int revents)
+{
+ WL w;
+ int signum;
+
+ read (sigpipe [0], &revents, 1);
+ gotsig = 0;
+
+ for (signum = signalmax; signum--; )
+ if (signals [signum].gotsig)
+ {
+ signals [signum].gotsig = 0;
+
+ for (w = signals [signum].head; w; w = w->next)
+ event (EV_A_ (W)w, EV_SIGNAL);
+ }
+}
+
+static void
+siginit (EV_P)
+{
+#ifndef WIN32
+ fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
+ fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
+
+ /* rather than sort out wether we really need nb, set it */
+ fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
+ fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
#endif
-int ev_init (int flags)
+ ev_io_set (&sigev, sigpipe [0], EV_READ);
+ ev_io_start (EV_A_ &sigev);
+ ev_unref (EV_A); /* child watcher should not keep loop alive */
+}
+
+/*****************************************************************************/
+
+static struct ev_child *childs [PID_HASHSIZE];
+
+#ifndef WIN32
+
+static struct ev_signal childev;
+
+#ifndef WCONTINUED
+# define WCONTINUED 0
+#endif
+
+static void
+child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
+{
+ struct ev_child *w;
+
+ for (w = (struct ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child *)((WL)w)->next)
+ if (w->pid == pid || !w->pid)
+ {
+ ev_priority (w) = ev_priority (sw); /* need to do it *now* */
+ w->rpid = pid;
+ w->rstatus = status;
+ event (EV_A_ (W)w, EV_CHILD);
+ }
+}
+
+static void
+childcb (EV_P_ struct ev_signal *sw, int revents)
{
-#if HAVE_MONOTONIC
- {
- struct timespec ts;
- if (!clock_gettime (CLOCK_MONOTONIC, &ts))
- have_monotonic = 1;
- }
+ int pid, status;
+
+ if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
+ {
+ /* make sure we are called again until all childs have been reaped */
+ event (EV_A_ (W)sw, EV_SIGNAL);
+
+ child_reap (EV_A_ sw, pid, pid, status);
+ child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */
+ }
+}
+
#endif
- ev_now = ev_time ();
- now = get_clock ();
- diff = ev_now - now;
+/*****************************************************************************/
-#if HAVE_EPOLL
- if (epoll_init (flags))
- return ev_method;
+#if EV_USE_KQUEUE
+# include "ev_kqueue.c"
+#endif
+#if EV_USE_EPOLL
+# include "ev_epoll.c"
+#endif
+#if EV_USE_POLL
+# include "ev_poll.c"
#endif
-#if HAVE_SELECT
- if (select_init (flags))
- return ev_method;
+#if EV_USE_SELECT
+# include "ev_select.c"
#endif
- ev_method = EVMETHOD_NONE;
- return ev_method;
+int
+ev_version_major (void)
+{
+ return EV_VERSION_MAJOR;
}
-void ev_prefork (void)
+int
+ev_version_minor (void)
{
+ return EV_VERSION_MINOR;
}
-void ev_postfork_parent (void)
+/* return true if we are running with elevated privileges and should ignore env variables */
+static int
+enable_secure (void)
{
+#ifdef WIN32
+ return 0;
+#else
+ return getuid () != geteuid ()
+ || getgid () != getegid ();
+#endif
}
-void ev_postfork_child (void)
+int
+ev_method (EV_P)
{
-#if HAVE_EPOLL
- epoll_postfork_child ();
-#endif
+ return method;
}
static void
-call_pending ()
+loop_init (EV_P_ int methods)
+{
+ if (!method)
+ {
+#if EV_USE_MONOTONIC
+ {
+ struct timespec ts;
+ if (!clock_gettime (CLOCK_MONOTONIC, &ts))
+ have_monotonic = 1;
+ }
+#endif
+
+ rt_now = ev_time ();
+ mn_now = get_clock ();
+ now_floor = mn_now;
+ rtmn_diff = rt_now - mn_now;
+
+ if (methods == EVMETHOD_AUTO)
+ if (!enable_secure () && getenv ("LIBEV_METHODS"))
+ methods = atoi (getenv ("LIBEV_METHODS"));
+ else
+ methods = EVMETHOD_ANY;
+
+ method = 0;
+#if EV_USE_WIN32
+ if (!method && (methods & EVMETHOD_WIN32 )) method = win32_init (EV_A_ methods);
+#endif
+#if EV_USE_KQUEUE
+ if (!method && (methods & EVMETHOD_KQUEUE)) method = kqueue_init (EV_A_ methods);
+#endif
+#if EV_USE_EPOLL
+ if (!method && (methods & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ methods);
+#endif
+#if EV_USE_POLL
+ if (!method && (methods & EVMETHOD_POLL )) method = poll_init (EV_A_ methods);
+#endif
+#if EV_USE_SELECT
+ if (!method && (methods & EVMETHOD_SELECT)) method = select_init (EV_A_ methods);
+#endif
+
+ ev_watcher_init (&sigev, sigcb);
+ ev_set_priority (&sigev, EV_MAXPRI);
+ }
+}
+
+void
+loop_destroy (EV_P)
{
int i;
- for (i = 0; i < pendingcnt; ++i)
+#if EV_USE_WIN32
+ if (method == EVMETHOD_WIN32 ) win32_destroy (EV_A);
+#endif
+#if EV_USE_KQUEUE
+ if (method == EVMETHOD_KQUEUE) kqueue_destroy (EV_A);
+#endif
+#if EV_USE_EPOLL
+ if (method == EVMETHOD_EPOLL ) epoll_destroy (EV_A);
+#endif
+#if EV_USE_POLL
+ if (method == EVMETHOD_POLL ) poll_destroy (EV_A);
+#endif
+#if EV_USE_SELECT
+ if (method == EVMETHOD_SELECT) select_destroy (EV_A);
+#endif
+
+ for (i = NUMPRI; i--; )
+ array_free (pending, [i]);
+
+ /* have to use the microsoft-never-gets-it-right macro */
+ array_free_microshit (fdchange);
+ array_free_microshit (timer);
+ array_free_microshit (periodic);
+ array_free_microshit (idle);
+ array_free_microshit (prepare);
+ array_free_microshit (check);
+
+ method = 0;
+}
+
+static void
+loop_fork (EV_P)
+{
+#if EV_USE_EPOLL
+ if (method == EVMETHOD_EPOLL ) epoll_fork (EV_A);
+#endif
+#if EV_USE_KQUEUE
+ if (method == EVMETHOD_KQUEUE) kqueue_fork (EV_A);
+#endif
+
+ if (ev_is_active (&sigev))
+ {
+ /* default loop */
+
+ ev_ref (EV_A);
+ ev_io_stop (EV_A_ &sigev);
+ close (sigpipe [0]);
+ close (sigpipe [1]);
+
+ while (pipe (sigpipe))
+ syserr ("(libev) error creating pipe");
+
+ siginit (EV_A);
+ }
+
+ postfork = 0;
+}
+
+#if EV_MULTIPLICITY
+struct ev_loop *
+ev_loop_new (int methods)
+{
+ struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
+
+ memset (loop, 0, sizeof (struct ev_loop));
+
+ loop_init (EV_A_ methods);
+
+ if (ev_method (EV_A))
+ return loop;
+
+ return 0;
+}
+
+void
+ev_loop_destroy (EV_P)
+{
+ loop_destroy (EV_A);
+ ev_free (loop);
+}
+
+void
+ev_loop_fork (EV_P)
+{
+ postfork = 1;
+}
+
+#endif
+
+#if EV_MULTIPLICITY
+struct ev_loop default_loop_struct;
+static struct ev_loop *default_loop;
+
+struct ev_loop *
+#else
+static int default_loop;
+
+int
+#endif
+ev_default_loop (int methods)
+{
+ if (sigpipe [0] == sigpipe [1])
+ if (pipe (sigpipe))
+ return 0;
+
+ if (!default_loop)
{
- ANPENDING *p = pendings + i;
+#if EV_MULTIPLICITY
+ struct ev_loop *loop = default_loop = &default_loop_struct;
+#else
+ default_loop = 1;
+#endif
+
+ loop_init (EV_A_ methods);
- if (p->w)
+ if (ev_method (EV_A))
{
- p->w->pending = 0;
- p->w->cb (p->w, p->events);
+ siginit (EV_A);
+
+#ifndef WIN32
+ ev_signal_init (&childev, childcb, SIGCHLD);
+ ev_set_priority (&childev, EV_MAXPRI);
+ ev_signal_start (EV_A_ &childev);
+ ev_unref (EV_A); /* child watcher should not keep loop alive */
+#endif
}
+ else
+ default_loop = 0;
}
- pendingcnt = 0;
+ return default_loop;
+}
+
+void
+ev_default_destroy (void)
+{
+#if EV_MULTIPLICITY
+ struct ev_loop *loop = default_loop;
+#endif
+
+#ifndef WIN32
+ ev_ref (EV_A); /* child watcher */
+ ev_signal_stop (EV_A_ &childev);
+#endif
+
+ ev_ref (EV_A); /* signal watcher */
+ ev_io_stop (EV_A_ &sigev);
+
+ close (sigpipe [0]); sigpipe [0] = 0;
+ close (sigpipe [1]); sigpipe [1] = 0;
+
+ loop_destroy (EV_A);
+}
+
+void
+ev_default_fork (void)
+{
+#if EV_MULTIPLICITY
+ struct ev_loop *loop = default_loop;
+#endif
+
+ if (method)
+ postfork = 1;
+}
+
+/*****************************************************************************/
+
+static void
+call_pending (EV_P)
+{
+ int pri;
+
+ for (pri = NUMPRI; pri--; )
+ while (pendingcnt [pri])
+ {
+ ANPENDING *p = pendings [pri] + --pendingcnt [pri];
+
+ if (p->w)
+ {
+ p->w->pending = 0;
+ p->w->cb (EV_A_ p->w, p->events);
+ }
+ }
}
static void
-timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)
+timers_reify (EV_P)
{
- while (timercnt && timers [0]->at <= now)
+ while (timercnt && ((WT)timers [0])->at <= mn_now)
{
struct ev_timer *w = timers [0];
+ assert (("inactive timer on timer heap detected", ev_is_active (w)));
+
/* first reschedule or stop timer */
if (w->repeat)
{
- if (w->is_abs)
- w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat;
- else
- w->at = now + w->repeat;
-
- assert (w->at > now);
-
- downheap (timers, timercnt, 0);
+ assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
+ ((WT)w)->at = mn_now + w->repeat;
+ downheap ((WT *)timers, timercnt, 0);
}
else
+ ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
+
+ event (EV_A_ (W)w, EV_TIMEOUT);
+ }
+}
+
+static void
+periodics_reify (EV_P)
+{
+ while (periodiccnt && ((WT)periodics [0])->at <= rt_now)
+ {
+ struct ev_periodic *w = periodics [0];
+
+ assert (("inactive timer on periodic heap detected", ev_is_active (w)));
+
+ /* first reschedule or stop timer */
+ if (w->interval)
{
- evtimer_stop (w); /* nonrepeating: stop timer */
- --timercnt; /* maybe pass by reference instead? */
+ ((WT)w)->at += floor ((rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
+ assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > rt_now));
+ downheap ((WT *)periodics, periodiccnt, 0);
}
+ else
+ ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
- event ((struct ev_watcher *)w, EV_TIMEOUT);
+ event (EV_A_ (W)w, EV_PERIODIC);
}
}
static void
-time_update ()
+periodics_reschedule (EV_P)
{
int i;
- ev_now = ev_time ();
- if (have_monotonic)
+ /* adjust periodics after time jump */
+ for (i = 0; i < periodiccnt; ++i)
{
- ev_tstamp odiff = diff;
+ struct ev_periodic *w = periodics [i];
- /* detecting time jumps is much more difficult */
- for (i = 2; --i; ) /* loop a few times, before making important decisions */
+ if (w->interval)
{
- now = get_clock ();
- diff = ev_now - now;
+ ev_tstamp diff = ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval;
- if (fabs (odiff - diff) < MIN_TIMEJUMP)
- return; /* all is well */
+ if (fabs (diff) >= 1e-4)
+ {
+ ev_periodic_stop (EV_A_ w);
+ ev_periodic_start (EV_A_ w);
- ev_now = ev_time ();
+ i = 0; /* restart loop, inefficient, but time jumps should be rare */
+ }
}
+ }
+}
+
+inline int
+time_update_monotonic (EV_P)
+{
+ mn_now = get_clock ();
+
+ if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
+ {
+ rt_now = rtmn_diff + mn_now;
+ return 0;
+ }
+ else
+ {
+ now_floor = mn_now;
+ rt_now = ev_time ();
+ return 1;
+ }
+}
+
+static void
+time_update (EV_P)
+{
+ int i;
- /* time jump detected, reschedule atimers */
- for (i = 0; i < atimercnt; ++i)
+#if EV_USE_MONOTONIC
+ if (expect_true (have_monotonic))
+ {
+ if (time_update_monotonic (EV_A))
{
- struct ev_timer *w = atimers [i];
- w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;
+ ev_tstamp odiff = rtmn_diff;
+
+ for (i = 4; --i; ) /* loop a few times, before making important decisions */
+ {
+ rtmn_diff = rt_now - mn_now;
+
+ if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
+ return; /* all is well */
+
+ rt_now = ev_time ();
+ mn_now = get_clock ();
+ now_floor = mn_now;
+ }
+
+ periodics_reschedule (EV_A);
+ /* no timer adjustment, as the monotonic clock doesn't jump */
+ /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
}
}
else
+#endif
{
- if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
- /* time jump detected, adjust rtimers */
- for (i = 0; i < rtimercnt; ++i)
- rtimers [i]->at += ev_now - now;
+ rt_now = ev_time ();
- now = ev_now;
+ if (expect_false (mn_now > rt_now || mn_now < rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
+ {
+ periodics_reschedule (EV_A);
+
+ /* adjust timers. this is easy, as the offset is the same for all */
+ for (i = 0; i < timercnt; ++i)
+ ((WT)timers [i])->at += rt_now - mn_now;
+ }
+
+ mn_now = rt_now;
}
}
-int ev_loop_done;
+void
+ev_ref (EV_P)
+{
+ ++activecnt;
+}
+
+void
+ev_unref (EV_P)
+{
+ --activecnt;
+}
+
+static int loop_done;
-void ev_loop (int flags)
+void
+ev_loop (EV_P_ int flags)
{
double block;
- ev_loop_done = flags & EVLOOP_ONESHOT;
+ loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
do
{
+ /* queue check watchers (and execute them) */
+ if (expect_false (preparecnt))
+ {
+ queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
+ call_pending (EV_A);
+ }
+
+ /* we might have forked, so reify kernel state if necessary */
+ if (expect_false (postfork))
+ loop_fork (EV_A);
+
/* update fd-related kernel structures */
- method_reify (); fdchangecnt = 0;
+ fd_reify (EV_A);
/* calculate blocking time */
- if (flags & EVLOOP_NONBLOCK)
+
+ /* we only need this for !monotonic clockor timers, but as we basically
+ always have timers, we just calculate it always */
+#if EV_USE_MONOTONIC
+ if (expect_true (have_monotonic))
+ time_update_monotonic (EV_A);
+ else
+#endif
+ {
+ rt_now = ev_time ();
+ mn_now = rt_now;
+ }
+
+ if (flags & EVLOOP_NONBLOCK || idlecnt)
block = 0.;
else
{
block = MAX_BLOCKTIME;
- if (rtimercnt)
+ if (timercnt)
{
- ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;
+ ev_tstamp to = ((WT)timers [0])->at - mn_now + method_fudge;
if (block > to) block = to;
}
- if (atimercnt)
+ if (periodiccnt)
{
- ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;
+ ev_tstamp to = ((WT)periodics [0])->at - rt_now + method_fudge;
if (block > to) block = to;
}
if (block < 0.) block = 0.;
}
- method_poll (block);
+ method_poll (EV_A_ block);
+
+ /* update rt_now, do magic */
+ time_update (EV_A);
- /* update ev_now, do magic */
- time_update ();
+ /* queue pending timers and reschedule them */
+ timers_reify (EV_A); /* relative timers called last */
+ periodics_reify (EV_A); /* absolute timers called first */
- /* put pending timers into pendign queue and reschedule them */
- /* absolute timers first */
- timers_reify (atimers, atimercnt, ev_now);
- /* relative timers second */
- timers_reify (rtimers, rtimercnt, now);
+ /* queue idle watchers unless io or timers are pending */
+ if (!pendingcnt)
+ queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
- call_pending ();
+ /* queue check watchers, to be executed first */
+ if (checkcnt)
+ queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
+
+ call_pending (EV_A);
}
- while (!ev_loop_done);
+ while (activecnt && !loop_done);
+
+ if (loop_done != 2)
+ loop_done = 0;
}
-static void
-wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)
+void
+ev_unloop (EV_P_ int how)
+{
+ loop_done = how;
+}
+
+/*****************************************************************************/
+
+inline void
+wlist_add (WL *head, WL elem)
{
elem->next = *head;
*head = elem;
}
-static void
-wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)
+inline void
+wlist_del (WL *head, WL elem)
{
while (*head)
{
}
}
-static void
-ev_start (struct ev_watcher *w, int active)
+inline void
+ev_clear_pending (EV_P_ W w)
{
- w->pending = 0;
- w->active = active;
+ if (w->pending)
+ {
+ pendings [ABSPRI (w)][w->pending - 1].w = 0;
+ w->pending = 0;
+ }
}
-static void
-ev_stop (struct ev_watcher *w)
+inline void
+ev_start (EV_P_ W w, int active)
{
- if (w->pending)
- pendings [w->pending - 1].w = 0;
+ if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
+ if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
+
+ w->active = active;
+ ev_ref (EV_A);
+}
+inline void
+ev_stop (EV_P_ W w)
+{
+ ev_unref (EV_A);
w->active = 0;
- /* nop */
}
+/*****************************************************************************/
+
void
-evio_start (struct ev_io *w)
+ev_io_start (EV_P_ struct ev_io *w)
{
+ int fd = w->fd;
+
if (ev_is_active (w))
return;
- int fd = w->fd;
+ assert (("ev_io_start called with negative fd", fd >= 0));
- ev_start ((struct ev_watcher *)w, 1);
- array_needsize (anfds, anfdmax, fd + 1, anfds_init);
- wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w);
+ ev_start (EV_A_ (W)w, 1);
+ array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
+ wlist_add ((WL *)&anfds[fd].head, (WL)w);
- ++fdchangecnt;
- array_needsize (fdchanges, fdchangemax, fdchangecnt, );
- fdchanges [fdchangecnt - 1] = fd;
+ fd_change (EV_A_ fd);
}
void
-evio_stop (struct ev_io *w)
+ev_io_stop (EV_P_ struct ev_io *w)
{
+ ev_clear_pending (EV_A_ (W)w);
if (!ev_is_active (w))
return;
- wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w);
- ev_stop ((struct ev_watcher *)w);
+ wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
+ ev_stop (EV_A_ (W)w);
- ++fdchangecnt;
- array_needsize (fdchanges, fdchangemax, fdchangecnt, );
- fdchanges [fdchangecnt - 1] = w->fd;
+ fd_change (EV_A_ w->fd);
}
void
-evtimer_start (struct ev_timer *w)
+ev_timer_start (EV_P_ struct ev_timer *w)
{
if (ev_is_active (w))
return;
- if (w->is_abs)
- {
- /* this formula differs from the one in timer_reify becuse we do not round up */
- if (w->repeat)
- w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;
+ ((WT)w)->at += mn_now;
- ev_start ((struct ev_watcher *)w, ++atimercnt);
- array_needsize (atimers, atimermax, atimercnt, );
- atimers [atimercnt - 1] = w;
- upheap (atimers, atimercnt - 1);
- }
- else
- {
- w->at += now;
+ assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
- ev_start ((struct ev_watcher *)w, ++rtimercnt);
- array_needsize (rtimers, rtimermax, rtimercnt, );
- rtimers [rtimercnt - 1] = w;
- upheap (rtimers, rtimercnt - 1);
- }
+ ev_start (EV_A_ (W)w, ++timercnt);
+ array_needsize (struct ev_timer *, timers, timermax, timercnt, (void));
+ timers [timercnt - 1] = w;
+ upheap ((WT *)timers, timercnt - 1);
+ assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
}
void
-evtimer_stop (struct ev_timer *w)
+ev_timer_stop (EV_P_ struct ev_timer *w)
{
+ ev_clear_pending (EV_A_ (W)w);
if (!ev_is_active (w))
return;
- if (w->is_abs)
+ assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
+
+ if (((W)w)->active < timercnt--)
{
- if (w->active < atimercnt--)
- {
- atimers [w->active - 1] = atimers [atimercnt];
- downheap (atimers, atimercnt, w->active - 1);
- }
+ timers [((W)w)->active - 1] = timers [timercnt];
+ downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
}
- else
+
+ ((WT)w)->at = w->repeat;
+
+ ev_stop (EV_A_ (W)w);
+}
+
+void
+ev_timer_again (EV_P_ struct ev_timer *w)
+{
+ if (ev_is_active (w))
{
- if (w->active < rtimercnt--)
+ if (w->repeat)
{
- rtimers [w->active - 1] = rtimers [rtimercnt];
- downheap (rtimers, rtimercnt, w->active - 1);
+ ((WT)w)->at = mn_now + w->repeat;
+ downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
}
+ else
+ ev_timer_stop (EV_A_ w);
}
-
- ev_stop ((struct ev_watcher *)w);
+ else if (w->repeat)
+ ev_timer_start (EV_A_ w);
}
void
-evsignal_start (struct ev_signal *w)
+ev_periodic_start (EV_P_ struct ev_periodic *w)
{
if (ev_is_active (w))
return;
- ev_start ((struct ev_watcher *)w, 1);
- array_needsize (signals, signalmax, w->signum, signals_init);
- wlist_add ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);
+ assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
+
+ /* this formula differs from the one in periodic_reify because we do not always round up */
+ if (w->interval)
+ ((WT)w)->at += ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval;
+
+ ev_start (EV_A_ (W)w, ++periodiccnt);
+ array_needsize (struct ev_periodic *, periodics, periodicmax, periodiccnt, (void));
+ periodics [periodiccnt - 1] = w;
+ upheap ((WT *)periodics, periodiccnt - 1);
+
+ assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
}
void
-evsignal_stop (struct ev_signal *w)
+ev_periodic_stop (EV_P_ struct ev_periodic *w)
{
+ ev_clear_pending (EV_A_ (W)w);
if (!ev_is_active (w))
return;
- wlist_del ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);
- ev_stop ((struct ev_watcher *)w);
+ assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
+
+ if (((W)w)->active < periodiccnt--)
+ {
+ periodics [((W)w)->active - 1] = periodics [periodiccnt];
+ downheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
+ }
+
+ ev_stop (EV_A_ (W)w);
}
-/*****************************************************************************/
-#if 1
+void
+ev_idle_start (EV_P_ struct ev_idle *w)
+{
+ if (ev_is_active (w))
+ return;
-static void
-sin_cb (struct ev_io *w, int revents)
+ ev_start (EV_A_ (W)w, ++idlecnt);
+ array_needsize (struct ev_idle *, idles, idlemax, idlecnt, (void));
+ idles [idlecnt - 1] = w;
+}
+
+void
+ev_idle_stop (EV_P_ struct ev_idle *w)
{
- fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
+ ev_clear_pending (EV_A_ (W)w);
+ if (ev_is_active (w))
+ return;
+
+ idles [((W)w)->active - 1] = idles [--idlecnt];
+ ev_stop (EV_A_ (W)w);
}
-static void
-ocb (struct ev_timer *w, int revents)
+void
+ev_prepare_start (EV_P_ struct ev_prepare *w)
{
- //fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
- evtimer_stop (w);
- evtimer_start (w);
+ if (ev_is_active (w))
+ return;
+
+ ev_start (EV_A_ (W)w, ++preparecnt);
+ array_needsize (struct ev_prepare *, prepares, preparemax, preparecnt, (void));
+ prepares [preparecnt - 1] = w;
}
-int main (void)
+void
+ev_prepare_stop (EV_P_ struct ev_prepare *w)
{
- struct ev_io sin;
+ ev_clear_pending (EV_A_ (W)w);
+ if (ev_is_active (w))
+ return;
- ev_init (0);
+ prepares [((W)w)->active - 1] = prepares [--preparecnt];
+ ev_stop (EV_A_ (W)w);
+}
+
+void
+ev_check_start (EV_P_ struct ev_check *w)
+{
+ if (ev_is_active (w))
+ return;
- evw_init (&sin, sin_cb, 55);
- evio_set (&sin, 0, EV_READ);
- evio_start (&sin);
+ ev_start (EV_A_ (W)w, ++checkcnt);
+ array_needsize (struct ev_check *, checks, checkmax, checkcnt, (void));
+ checks [checkcnt - 1] = w;
+}
- struct ev_timer t[10000];
+void
+ev_check_stop (EV_P_ struct ev_check *w)
+{
+ ev_clear_pending (EV_A_ (W)w);
+ if (ev_is_active (w))
+ return;
-#if 1
- int i;
- for (i = 0; i < 10000; ++i)
+ checks [((W)w)->active - 1] = checks [--checkcnt];
+ ev_stop (EV_A_ (W)w);
+}
+
+#ifndef SA_RESTART
+# define SA_RESTART 0
+#endif
+
+void
+ev_signal_start (EV_P_ struct ev_signal *w)
+{
+#if EV_MULTIPLICITY
+ assert (("signal watchers are only supported in the default loop", loop == default_loop));
+#endif
+ if (ev_is_active (w))
+ return;
+
+ assert (("ev_signal_start called with illegal signal number", w->signum > 0));
+
+ ev_start (EV_A_ (W)w, 1);
+ array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
+ wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
+
+ if (!((WL)w)->next)
{
- struct ev_timer *w = t + i;
- evw_init (w, ocb, i);
- evtimer_set_abs (w, drand48 (), 0.99775533);
- evtimer_start (w);
- if (drand48 () < 0.5)
- evtimer_stop (w);
- }
+#if WIN32
+ signal (w->signum, sighandler);
+#else
+ struct sigaction sa;
+ sa.sa_handler = sighandler;
+ sigfillset (&sa.sa_mask);
+ sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
+ sigaction (w->signum, &sa, 0);
#endif
+ }
+}
- struct ev_timer t1;
- evw_init (&t1, ocb, 0);
- evtimer_set_abs (&t1, 5, 10);
- evtimer_start (&t1);
+void
+ev_signal_stop (EV_P_ struct ev_signal *w)
+{
+ ev_clear_pending (EV_A_ (W)w);
+ if (!ev_is_active (w))
+ return;
- ev_loop (0);
+ wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
+ ev_stop (EV_A_ (W)w);
- return 0;
+ if (!signals [w->signum - 1].head)
+ signal (w->signum, SIG_DFL);
}
+void
+ev_child_start (EV_P_ struct ev_child *w)
+{
+#if EV_MULTIPLICITY
+ assert (("child watchers are only supported in the default loop", loop == default_loop));
#endif
+ if (ev_is_active (w))
+ return;
+
+ ev_start (EV_A_ (W)w, 1);
+ wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
+}
+
+void
+ev_child_stop (EV_P_ struct ev_child *w)
+{
+ ev_clear_pending (EV_A_ (W)w);
+ if (ev_is_active (w))
+ return;
+ wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
+ ev_stop (EV_A_ (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 (EV_P_ struct ev_once *once, int revents)
+{
+ void (*cb)(int revents, void *arg) = once->cb;
+ void *arg = once->arg;
+
+ ev_io_stop (EV_A_ &once->io);
+ ev_timer_stop (EV_A_ &once->to);
+ ev_free (once);
+
+ cb (revents, arg);
+}
+
+static void
+once_cb_io (EV_P_ struct ev_io *w, int revents)
+{
+ once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
+}
+static void
+once_cb_to (EV_P_ struct ev_timer *w, int revents)
+{
+ once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
+}
+
+void
+ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
+{
+ struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
+
+ if (!once)
+ cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
+ else
+ {
+ once->cb = cb;
+ once->arg = arg;
+
+ ev_watcher_init (&once->io, once_cb_io);
+ if (fd >= 0)
+ {
+ ev_io_set (&once->io, fd, events);
+ ev_io_start (EV_A_ &once->io);
+ }
+ ev_watcher_init (&once->to, once_cb_to);
+ if (timeout >= 0.)
+ {
+ ev_timer_set (&once->to, timeout, 0.);
+ ev_timer_start (EV_A_ &once->to);
+ }
+ }
+}
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