+/*
+ * 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 <unistd.h>
#include <fcntl.h>
#include <signal.h>
+#include <stddef.h>
#include <stdio.h>
#include <assert.h>
#include <errno.h>
+#include <sys/types.h>
+#ifndef WIN32
+# include <sys/wait.h>
+#endif
#include <sys/time.h>
#include <time.h>
-#ifndef HAVE_MONOTONIC
-# ifdef CLOCK_MONOTONIC
-# define HAVE_MONOTONIC 1
-# endif
+/**/
+
+#ifndef EV_USE_MONOTONIC
+# define EV_USE_MONOTONIC 1
#endif
-#ifndef HAVE_SELECT
-# define HAVE_SELECT 1
+#ifndef EV_USE_SELECT
+# define EV_USE_SELECT 1
#endif
-#ifndef HAVE_EPOLL
-# define HAVE_EPOLL 0
+#ifndef EV_USE_POLL
+# define EV_USE_POLL 0 /* poll is usually slower than select, and not as well tested */
#endif
-#ifndef HAVE_REALTIME
-# define HAVE_REALTIME 1 /* posix requirement, but might be slower */
+#ifndef EV_USE_EPOLL
+# define EV_USE_EPOLL 0
#endif
+#ifndef EV_USE_KQUEUE
+# define EV_USE_KQUEUE 0
+#endif
+
+#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
-struct ev_watcher_list {
- EV_WATCHER_LIST (ev_watcher_list);
-};
+#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? */
-static ev_tstamp now, diff; /* monotonic clock */
-ev_tstamp ev_now;
-int ev_method;
+/*****************************************************************************/
-static int have_monotonic; /* runtime */
+typedef struct
+{
+ struct ev_watcher_list *head;
+ unsigned char events;
+ unsigned char reify;
+} ANFD;
-static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */
-static void (*method_modify)(int fd, int oev, int nev);
-static void (*method_poll)(ev_tstamp timeout);
+typedef struct
+{
+ W w;
+ int events;
+} ANPENDING;
+
+#if EV_MULTIPLICITY
+
+struct ev_loop
+{
+# define VAR(name,decl) decl;
+# include "ev_vars.h"
+};
+# undef VAR
+# include "ev_wrap.h"
+
+#else
+
+# define VAR(name,decl) static decl;
+# include "ev_vars.h"
+# undef VAR
+
+#endif
/*****************************************************************************/
-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 ();
}
+ev_tstamp
+ev_now (EV_P)
+{
+ return rt_now;
+}
+
+#define array_roundsize(base,n) ((n) | 4 & ~3)
+
#define array_needsize(base,cur,cnt,init) \
- if ((cnt) > cur) \
+ if (expect_false ((cnt) > cur)) \
{ \
- int newcnt = cur ? cur << 1 : 16; \
- fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\
+ int newcnt = cur; \
+ do \
+ { \
+ newcnt = array_roundsize (base, newcnt << 1); \
+ } \
+ while ((cnt) > newcnt); \
+ \
base = realloc (base, sizeof (*base) * (newcnt)); \
init (base + cur, newcnt - cur); \
cur = newcnt; \
/*****************************************************************************/
-typedef struct
-{
- struct ev_io *head;
- unsigned char wev, rev; /* want, received event set */
-} ANFD;
-
-static ANFD *anfds;
-static int anfdmax;
-
-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)
{
- W 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 (pendings [ABSPRI (w)], pendingmax [ABSPRI (w)], pendingcnt [ABSPRI (w)], );
+ pendings [ABSPRI (w)][w->pending - 1].w = w;
+ pendings [ABSPRI (w)][w->pending - 1].events = events;
+}
static void
-event (W 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 ((W)w, ev);
+ event (EV_A_ (W)w, ev);
}
}
+/*****************************************************************************/
+
static void
-queue_events (W *events, int eventcnt, int type)
+fd_reify (EV_P)
{
int i;
- for (i = 0; i < eventcnt; ++i)
- event (events [i], type);
+ 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;
+
+ if (anfd->events != events)
+ {
+ 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 || fdchangecnt < 0)
+ return;
+
+ anfds [fd].reify = 1;
+
+ ++fdchangecnt;
+ array_needsize (fdchanges, fdchangemax, fdchangecnt, );
+ 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);
+ }
+}
+
+/* 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 (fcntl (fd, F_GETFD) == -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 = anfdmax;
-static struct ev_timer **atimers;
-static int atimermax, atimercnt;
+ while (fd--)
+ if (anfds [fd].events)
+ {
+ close (fd);
+ fd_kill (EV_A_ fd);
+ return;
+ }
+}
-static struct ev_timer **rtimers;
-static int rtimermax, rtimercnt;
+/* susually 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 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];
+ heap [k]->active = k + 1;
k >>= 1;
}
- timers [k] = w;
- timers [k]->active = k + 1;
+ heap [k] = 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];
+ heap [k]->active = k + 1;
k = j;
}
- timers [k] = w;
- timers [k]->active = k + 1;
+ heap [k] = w;
+ heap [k]->active = k + 1;
}
/*****************************************************************************/
typedef struct
{
- struct ev_signal *head;
- sig_atomic_t gotsig;
+ struct ev_watcher_list *head;
+ sig_atomic_t volatile gotsig;
} ANSIG;
static ANSIG *signals;
static int signalmax;
static int sigpipe [2];
-static sig_atomic_t gotsig;
+static sig_atomic_t volatile gotsig;
static struct ev_io sigev;
static void
{
base->head = 0;
base->gotsig = 0;
+
++base;
}
}
if (!gotsig)
{
+ int old_errno = errno;
gotsig = 1;
- write (sigpipe [1], &gotsig, 1);
+ write (sigpipe [1], &signum, 1);
+ errno = old_errno;
}
}
static void
-sigcb (struct ev_io *iow, int revents)
+sigcb (EV_P_ struct ev_io *iow, int revents)
{
- struct ev_signal *w;
- int sig;
+ struct ev_watcher_list *w;
+ int signum;
- gotsig = 0;
read (sigpipe [0], &revents, 1);
+ gotsig = 0;
- for (sig = signalmax; sig--; )
- if (signals [sig].gotsig)
+ for (signum = signalmax; signum--; )
+ if (signals [signum].gotsig)
{
- signals [sig].gotsig = 0;
+ signals [signum].gotsig = 0;
- for (w = signals [sig].head; w; w = w->next)
- event ((W)w, EV_SIGNAL);
+ for (w = signals [signum].head; w; w = w->next)
+ event (EV_A_ (W)w, EV_SIGNAL);
}
}
static void
-siginit (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
- evio_set (&sigev, sigpipe [0], EV_READ);
- evio_start (&sigev);
+ 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_idle **idles;
-static int idlemax, idlecnt;
+#ifndef WIN32
+
+static struct ev_child *childs [PID_HASHSIZE];
+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)
+ {
+ w->priority = sw->priority; /* 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)
+{
+ 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 */
+ }
+}
-static struct ev_check **checks;
-static int checkmax, checkcnt;
+#endif
/*****************************************************************************/
-#if HAVE_EPOLL
+#if EV_USE_KQUEUE
+# include "ev_kqueue.c"
+#endif
+#if EV_USE_EPOLL
# include "ev_epoll.c"
#endif
-#if HAVE_SELECT
+#if EV_USE_POLL
+# include "ev_poll.c"
+#endif
+#if EV_USE_SELECT
# include "ev_select.c"
#endif
-int ev_init (int flags)
+int
+ev_version_major (void)
+{
+ return EV_VERSION_MAJOR;
+}
+
+int
+ev_version_minor (void)
+{
+ return EV_VERSION_MINOR;
+}
+
+/* return true if we are running with elevated privileges and should ignore env variables */
+static int
+enable_secure (void)
{
-#if HAVE_MONOTONIC
- {
- struct timespec ts;
- if (!clock_gettime (CLOCK_MONOTONIC, &ts))
- have_monotonic = 1;
- }
+#ifdef WIN32
+ return 0;
+#else
+ return getuid () != geteuid ()
+ || getgid () != getegid ();
+#endif
+}
+
+int
+ev_method (EV_P)
+{
+ return method;
+}
+
+static void
+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
- ev_now = ev_time ();
- now = get_clock ();
- diff = ev_now - now;
+ rt_now = ev_time ();
+ mn_now = get_clock ();
+ now_floor = mn_now;
+ rtmn_diff = rt_now - mn_now;
- if (pipe (sigpipe))
- return 0;
+ if (methods == EVMETHOD_AUTO)
+ if (!enable_secure () && getenv ("LIBEV_METHODS"))
+ methods = atoi (getenv ("LIBEV_METHODS"));
+ else
+ methods = EVMETHOD_ANY;
- ev_method = EVMETHOD_NONE;
-#if HAVE_EPOLL
- if (ev_method == EVMETHOD_NONE) epoll_init (flags);
+ method = 0;
+#if EV_USE_KQUEUE
+ if (!method && (methods & EVMETHOD_KQUEUE)) method = kqueue_init (EV_A_ methods);
#endif
-#if HAVE_SELECT
- if (ev_method == EVMETHOD_NONE) select_init (flags);
+#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
-
- if (ev_method)
- {
- evw_init (&sigev, sigcb, 0);
- siginit ();
}
+}
- return ev_method;
+void
+loop_destroy (EV_P)
+{
+#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
+
+ method = 0;
+ /*TODO*/
}
-/*****************************************************************************/
+void
+loop_fork (EV_P)
+{
+ /*TODO*/
+#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_MULTIPLICITY
+struct ev_loop *
+ev_loop_new (int methods)
+{
+ struct ev_loop *loop = (struct ev_loop *)calloc (1, 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);
+ free (loop);
+}
+
+void
+ev_loop_fork (EV_P)
+{
+ loop_fork (EV_A);
+}
+
+#endif
+
+#if EV_MULTIPLICITY
+struct ev_loop default_loop_struct;
+static struct ev_loop *default_loop;
+
+struct ev_loop *
+#else
+static int default_loop;
-void ev_prefork (void)
+int
+#endif
+ev_default_loop (int methods)
{
+ if (sigpipe [0] == sigpipe [1])
+ if (pipe (sigpipe))
+ return 0;
+
+ if (!default_loop)
+ {
+#if EV_MULTIPLICITY
+ struct ev_loop *loop = default_loop = &default_loop_struct;
+#else
+ default_loop = 1;
+#endif
+
+ loop_init (EV_A_ methods);
+
+ if (ev_method (EV_A))
+ {
+ ev_watcher_init (&sigev, sigcb);
+ ev_set_priority (&sigev, EV_MAXPRI);
+ 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;
+ }
+
+ return default_loop;
}
-void ev_postfork_parent (void)
+void
+ev_default_destroy (void)
{
+#if EV_MULTIPLICITY
+ struct ev_loop *loop = default_loop;
+#endif
+
+ ev_ref (EV_A); /* child watcher */
+ ev_signal_stop (EV_A_ &childev);
+
+ 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_postfork_child (void)
+void
+ev_default_fork (void)
{
-#if HAVE_EPOLL
- if (ev_method == EVMETHOD_EPOLL)
- epoll_postfork_child ();
+#if EV_MULTIPLICITY
+ struct ev_loop *loop = default_loop;
#endif
- evio_stop (&sigev);
+ loop_fork (EV_A);
+
+ ev_io_stop (EV_A_ &sigev);
close (sigpipe [0]);
close (sigpipe [1]);
pipe (sigpipe);
- siginit ();
+
+ ev_ref (EV_A); /* signal watcher */
+ siginit (EV_A);
}
/*****************************************************************************/
static void
-fd_reify (void)
+call_pending (EV_P)
{
- int i;
+ int pri;
- for (i = 0; i < fdchangecnt; ++i)
- {
- int fd = fdchanges [i];
- ANFD *anfd = anfds + fd;
- struct ev_io *w;
+ for (pri = NUMPRI; pri--; )
+ while (pendingcnt [pri])
+ {
+ ANPENDING *p = pendings [pri] + --pendingcnt [pri];
- int wev = 0;
+ if (p->w)
+ {
+ p->w->pending = 0;
+ p->w->cb (EV_A_ p->w, p->events);
+ }
+ }
+}
- for (w = anfd->head; w; w = w->next)
- wev |= w->events;
+static void
+timers_reify (EV_P)
+{
+ while (timercnt && timers [0]->at <= mn_now)
+ {
+ struct ev_timer *w = timers [0];
- if (anfd->wev != wev)
+ /* first reschedule or stop timer */
+ if (w->repeat)
{
- method_modify (fd, anfd->wev, wev);
- anfd->wev = wev;
+ assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
+ w->at = mn_now + w->repeat;
+ downheap ((WT *)timers, timercnt, 0);
}
- }
+ else
+ ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
- fdchangecnt = 0;
+ event (EV_A_ (W)w, EV_TIMEOUT);
+ }
}
static void
-call_pending ()
+periodics_reify (EV_P)
{
- int i;
-
- for (i = 0; i < pendingcnt; ++i)
+ while (periodiccnt && periodics [0]->at <= rt_now)
{
- ANPENDING *p = pendings + i;
+ struct ev_periodic *w = periodics [0];
- if (p->w)
+ /* first reschedule or stop timer */
+ if (w->interval)
{
- p->w->pending = 0;
- p->w->cb (p->w, p->events);
+ w->at += floor ((rt_now - w->at) / w->interval + 1.) * w->interval;
+ assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", w->at > rt_now));
+ downheap ((WT *)periodics, periodiccnt, 0);
}
- }
+ else
+ ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
- pendingcnt = 0;
+ event (EV_A_ (W)w, EV_PERIODIC);
+ }
}
static void
-timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)
+periodics_reschedule (EV_P)
{
- while (timercnt && timers [0]->at <= now)
+ int i;
+
+ /* adjust periodics after time jump */
+ for (i = 0; i < periodiccnt; ++i)
{
- struct ev_timer *w = timers [0];
+ struct ev_periodic *w = periodics [i];
- /* first reschedule or stop timer */
- if (w->repeat)
+ if (w->interval)
{
- if (w->is_abs)
- w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat;
- else
- w->at = now + w->repeat;
+ ev_tstamp diff = ceil ((rt_now - w->at) / w->interval) * w->interval;
- assert (w->at > now);
+ if (fabs (diff) >= 1e-4)
+ {
+ ev_periodic_stop (EV_A_ w);
+ ev_periodic_start (EV_A_ w);
- downheap (timers, timercnt, 0);
- }
- else
- {
- evtimer_stop (w); /* nonrepeating: stop timer */
- --timercnt; /* maybe pass by reference instead? */
+ i = 0; /* restart loop, inefficient, but time jumps should be rare */
+ }
}
+ }
+}
+
+inline int
+time_update_monotonic (EV_P)
+{
+ mn_now = get_clock ();
- event ((W)w, EV_TIMEOUT);
+ 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 ()
+time_update (EV_P)
{
int i;
- ev_now = ev_time ();
- if (have_monotonic)
+#if EV_USE_MONOTONIC
+ if (expect_true (have_monotonic))
{
- ev_tstamp odiff = diff;
-
- /* detecting time jumps is much more difficult */
- for (i = 2; --i; ) /* loop a few times, before making important decisions */
+ if (time_update_monotonic (EV_A))
{
- now = get_clock ();
- diff = ev_now - now;
+ ev_tstamp odiff = rtmn_diff;
- if (fabs (odiff - diff) < MIN_TIMEJUMP)
- return; /* all is well */
+ for (i = 4; --i; ) /* loop a few times, before making important decisions */
+ {
+ rtmn_diff = rt_now - mn_now;
- ev_now = ev_time ();
- }
+ if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
+ return; /* all is well */
- /* time jump detected, reschedule atimers */
- for (i = 0; i < atimercnt; ++i)
- {
- struct ev_timer *w = atimers [i];
- w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;
+ 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)
+ 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;
-
- if (checkcnt)
- {
- queue_events ((W *)checks, checkcnt, EV_CHECK);
- call_pending ();
- }
+ 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);
+ }
+
/* update fd-related kernel structures */
- fd_reify ();
+ fd_reify (EV_A);
/* calculate blocking time */
+
+ /* 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 = 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 = 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 ev_now, do magic */
- time_update ();
+ /* update rt_now, do magic */
+ time_update (EV_A);
/* queue pending timers and reschedule them */
- /* absolute timers first */
- timers_reify (atimers, atimercnt, ev_now);
- /* relative timers second */
- timers_reify (rtimers, rtimercnt, now);
+ timers_reify (EV_A); /* relative timers called last */
+ periodics_reify (EV_A); /* absolute timers called first */
/* queue idle watchers unless io or timers are pending */
if (!pendingcnt)
- queue_events ((W *)idles, idlecnt, EV_IDLE);
+ queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
- /* queue check and possibly idle watchers */
- queue_events ((W *)checks, checkcnt, EV_CHECK);
+ /* queue check watchers, to be executed first */
+ if (checkcnt)
+ queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
- call_pending ();
+ call_pending (EV_A);
}
- while (!ev_loop_done);
+ while (activecnt && !loop_done);
+
+ if (loop_done != 2)
+ loop_done = 0;
+}
+
+void
+ev_unloop (EV_P_ int how)
+{
+ loop_done = how;
}
/*****************************************************************************/
-static void
+inline void
wlist_add (WL *head, WL elem)
{
elem->next = *head;
*head = elem;
}
-static void
+inline void
wlist_del (WL *head, WL elem)
{
while (*head)
}
}
-static void
-ev_start (W 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 (W 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 ((W)w, 1);
+ ev_start (EV_A_ (W)w, 1);
array_needsize (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 ((WL *)&anfds[w->fd].head, (WL)w);
- ev_stop ((W)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;
+ w->at += mn_now;
- ev_start ((W)w, ++atimercnt);
- array_needsize (atimers, atimermax, atimercnt, );
- atimers [atimercnt - 1] = w;
- upheap (atimers, atimercnt - 1);
- }
- else
- {
- w->at += now;
-
- ev_start ((W)w, ++rtimercnt);
- array_needsize (rtimers, rtimermax, rtimercnt, );
- rtimers [rtimercnt - 1] = w;
- upheap (rtimers, rtimercnt - 1);
- }
+ assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
+ ev_start (EV_A_ (W)w, ++timercnt);
+ array_needsize (timers, timermax, timercnt, );
+ timers [timercnt - 1] = w;
+ upheap ((WT *)timers, timercnt - 1);
}
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)
+ if (w->active < timercnt--)
{
- if (w->active < atimercnt--)
- {
- atimers [w->active - 1] = atimers [atimercnt];
- downheap (atimers, atimercnt, w->active - 1);
- }
+ timers [w->active - 1] = timers [timercnt];
+ downheap ((WT *)timers, timercnt, w->active - 1);
}
- else
+
+ 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);
+ w->at = mn_now + w->repeat;
+ downheap ((WT *)timers, timercnt, w->active - 1);
}
+ else
+ ev_timer_stop (EV_A_ w);
}
-
- ev_stop ((W)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 ((W)w, 1);
- array_needsize (signals, signalmax, w->signum, signals_init);
- wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
+ assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
- if (!w->next)
- {
- struct sigaction sa;
- sa.sa_handler = sighandler;
- sigfillset (&sa.sa_mask);
- sa.sa_flags = 0;
- sigaction (w->signum, &sa, 0);
- }
+ /* this formula differs from the one in periodic_reify because we do not always round up */
+ if (w->interval)
+ w->at += ceil ((rt_now - w->at) / w->interval) * w->interval;
+
+ ev_start (EV_A_ (W)w, ++periodiccnt);
+ array_needsize (periodics, periodicmax, periodiccnt, );
+ periodics [periodiccnt - 1] = w;
+ upheap ((WT *)periodics, periodiccnt - 1);
}
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 ((WL *)&signals [w->signum - 1].head, (WL)w);
- ev_stop ((W)w);
+ if (w->active < periodiccnt--)
+ {
+ periodics [w->active - 1] = periodics [periodiccnt];
+ downheap ((WT *)periodics, periodiccnt, w->active - 1);
+ }
- if (!signals [w->signum - 1].head)
- signal (w->signum, SIG_DFL);
+ ev_stop (EV_A_ (W)w);
}
-void evidle_start (struct ev_idle *w)
+void
+ev_idle_start (EV_P_ struct ev_idle *w)
{
if (ev_is_active (w))
return;
- ev_start ((W)w, ++idlecnt);
+ ev_start (EV_A_ (W)w, ++idlecnt);
array_needsize (idles, idlemax, idlecnt, );
idles [idlecnt - 1] = w;
}
-void evidle_stop (struct ev_idle *w)
+void
+ev_idle_stop (EV_P_ struct ev_idle *w)
{
+ ev_clear_pending (EV_A_ (W)w);
+ if (ev_is_active (w))
+ return;
+
idles [w->active - 1] = idles [--idlecnt];
- ev_stop ((W)w);
+ ev_stop (EV_A_ (W)w);
}
-void evcheck_start (struct ev_check *w)
+void
+ev_prepare_start (EV_P_ struct ev_prepare *w)
{
if (ev_is_active (w))
return;
- ev_start ((W)w, ++checkcnt);
- array_needsize (checks, checkmax, checkcnt, );
- checks [checkcnt - 1] = w;
+ ev_start (EV_A_ (W)w, ++preparecnt);
+ array_needsize (prepares, preparemax, preparecnt, );
+ prepares [preparecnt - 1] = w;
}
-void evcheck_stop (struct ev_check *w)
+void
+ev_prepare_stop (EV_P_ struct ev_prepare *w)
{
- checks [w->active - 1] = checks [--checkcnt];
- ev_stop ((W)w);
-}
-
-/*****************************************************************************/
+ ev_clear_pending (EV_A_ (W)w);
+ if (ev_is_active (w))
+ return;
-#if 0
+ prepares [w->active - 1] = prepares [--preparecnt];
+ ev_stop (EV_A_ (W)w);
+}
-static void
-sin_cb (struct ev_io *w, int revents)
+void
+ev_check_start (EV_P_ struct ev_check *w)
{
- fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
+ if (ev_is_active (w))
+ return;
+
+ ev_start (EV_A_ (W)w, ++checkcnt);
+ array_needsize (checks, checkmax, checkcnt, );
+ checks [checkcnt - 1] = w;
}
-static void
-ocb (struct ev_timer *w, int revents)
+void
+ev_check_stop (EV_P_ struct ev_check *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);
+ ev_clear_pending (EV_A_ (W)w);
+ if (ev_is_active (w))
+ return;
+
+ checks [w->active - 1] = checks [--checkcnt];
+ ev_stop (EV_A_ (W)w);
}
-static void
-scb (struct ev_signal *w, int revents)
+#ifndef SA_RESTART
+# define SA_RESTART 0
+#endif
+
+void
+ev_signal_start (EV_P_ struct ev_signal *w)
{
- fprintf (stderr, "signal %x,%d\n", revents, w->signum);
+#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 (signals, signalmax, w->signum, signals_init);
+ wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
+
+ if (!w->next)
+ {
+ 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);
+ }
}
-static void
-gcb (struct ev_signal *w, int revents)
+void
+ev_signal_stop (EV_P_ struct ev_signal *w)
{
- fprintf (stderr, "generic %x\n", revents);
+ ev_clear_pending (EV_A_ (W)w);
+ if (!ev_is_active (w))
+ return;
+
+ wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
+ ev_stop (EV_A_ (W)w);
+
+ if (!signals [w->signum - 1].head)
+ signal (w->signum, SIG_DFL);
}
-int main (void)
+void
+ev_child_start (EV_P_ struct ev_child *w)
{
- struct ev_io sin;
+#if EV_MULTIPLICITY
+ assert (("child watchers are only supported in the default loop", loop == default_loop));
+#endif
+ if (ev_is_active (w))
+ return;
- ev_init (0);
+ ev_start (EV_A_ (W)w, 1);
+ wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
+}
- evw_init (&sin, sin_cb, 55);
- evio_set (&sin, 0, EV_READ);
- evio_start (&sin);
+void
+ev_child_stop (EV_P_ struct ev_child *w)
+{
+ ev_clear_pending (EV_A_ (W)w);
+ if (ev_is_active (w))
+ return;
- struct ev_timer t[10000];
+ wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
+ ev_stop (EV_A_ (W)w);
+}
-#if 0
- int i;
- for (i = 0; i < 10000; ++i)
- {
- 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);
- }
-#endif
+/*****************************************************************************/
- struct ev_timer t1;
- evw_init (&t1, ocb, 0);
- evtimer_set_abs (&t1, 5, 10);
- evtimer_start (&t1);
+struct ev_once
+{
+ struct ev_io io;
+ struct ev_timer to;
+ void (*cb)(int revents, void *arg);
+ void *arg;
+};
- struct ev_signal sig;
- evw_init (&sig, scb, 65535);
- evsignal_set (&sig, SIGQUIT);
- evsignal_start (&sig);
+static void
+once_cb (EV_P_ struct ev_once *once, int revents)
+{
+ void (*cb)(int revents, void *arg) = once->cb;
+ void *arg = once->arg;
- struct ev_check cw;
- evw_init (&cw, gcb, 0);
- evcheck_start (&cw);
+ ev_io_stop (EV_A_ &once->io);
+ ev_timer_stop (EV_A_ &once->to);
+ free (once);
- struct ev_idle iw;
- evw_init (&iw, gcb, 0);
- evidle_start (&iw);
+ cb (revents, arg);
+}
- ev_loop (0);
+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);
+}
- return 0;
+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);
}
-#endif
+void
+ev_once (EV_P_ 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 | 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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