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first try at embed watchers

master
Marc Alexander Lehmann 2007-11-23 19:13:33 +00:00
parent 0162f178a9
commit 56732f9681
7 changed files with 103 additions and 35 deletions
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49
ev.c
View File

@ -399,6 +399,9 @@ ev_feed_event (EV_P_ void *w, int revents)
return;
}
if (expect_false (!w_->cb))
return;
w_->pending = ++pendingcnt [ABSPRI (w_)];
array_needsize (ANPENDING, pendings [ABSPRI (w_)], pendingmax [ABSPRI (w_)], pendingcnt [ABSPRI (w_)], EMPTY2);
pendings [ABSPRI (w_)][w_->pending - 1].w = w_;
@ -817,6 +820,14 @@ ev_recommended_backends (void)
return flags;
}
unsigned int
ev_embeddable_backends (void)
{
return EVBACKEND_EPOLL
| EVBACKEND_KQUEUE
| EVBACKEND_PORT;
}
unsigned int
ev_backend (EV_P)
{
@ -1661,6 +1672,44 @@ ev_child_stop (EV_P_ struct ev_child *w)
ev_stop (EV_A_ (W)w);
}
#if EV_MULTIPLICITY
static void
embed_cb (EV_P_ struct ev_io *io, int revents)
{
struct ev_embed *w = (struct ev_embed *)(((char *)io) - offsetof (struct ev_embed, io));
ev_feed_event (EV_A_ (W)w, EV_EMBED);
ev_loop (w->loop, EVLOOP_NONBLOCK);
}
void
ev_embed_start (EV_P_ struct ev_embed *w)
{
if (expect_false (ev_is_active (w)))
return;
{
struct ev_loop *loop = w->loop;
assert (("loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
ev_io_init (&w->io, embed_cb, backend_fd, EV_READ);
}
ev_io_start (EV_A_ &w->io);
ev_start (EV_A_ (W)w, 1);
}
void
ev_embed_stop (EV_P_ struct ev_embed *w)
{
ev_clear_pending (EV_A_ (W)w);
if (expect_false (!ev_is_active (w)))
return;
ev_io_stop (EV_A_ &w->io);
ev_stop (EV_A_ (W)w);
}
#endif
/*****************************************************************************/
struct ev_once

24
ev.h
View File

@ -82,6 +82,7 @@ struct ev_loop;
#define EV_CHECK 0x001000L /* check only */
#define EV_PREPARE 0x002000L /* prepare only */
#define EV_CHILD 0x004000L /* child/pid only */
#define EV_EMBED 0x008000L /* embedded event loop */
#define EV_ERROR 0x800000L /* sent when an error occurs */
/* can be used to add custom fields to all watchers, while losing binary compatibility */
@ -215,6 +216,18 @@ struct ev_child
int rstatus; /* rw, holds the exit status, use the macros from sys/wait.h */
};
#if EV_MULTIPLICITY
/* used to embed an event loop inside another */
/* the callback gets invoked when the event loop has handled events, and can be 0 */
struct ev_embed
{
EV_WATCHER (ev_embed)
struct ev_io io; /* private */
struct ev_loop *loop; /* ro */
};
#endif
/* the presence of this union forces similar struct layout */
union ev_any_watcher
{
@ -229,6 +242,7 @@ union ev_any_watcher
struct ev_check check;
struct ev_signal signal;
struct ev_child child;
struct ev_embed embed;
};
/* bits for ev_default_loop and ev_loop_new */
@ -250,6 +264,7 @@ int ev_version_minor (void);
unsigned int ev_supported_backends (void);
unsigned int ev_recommended_backends (void);
unsigned int ev_embeddable_backends (void);
ev_tstamp ev_time (void);
@ -351,6 +366,7 @@ void ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revent
#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_embed_set(ev,loop_) do { (ev)->loop = (loop_); } 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)
@ -360,6 +376,7 @@ void ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revent
#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_embed_init(ev,cb,loop) do { ev_init ((ev), (cb)); ev_embed_set ((ev),(loop)); } 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 */
@ -412,6 +429,13 @@ void ev_signal_stop (EV_P_ struct ev_signal *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);
# if EV_MULTIPLICITY
/* only supported when loop to be embedded is in fact embeddable */
void ev_embed_start (EV_P_ struct ev_embed *w);
void ev_embed_stop (EV_P_ struct ev_embed *w);
# endif
#endif
#ifdef __cplusplus

20
ev_epoll.c
View File

@ -42,9 +42,9 @@ epoll_modify (EV_P_ int fd, int oev, int nev)
(nev & EV_READ ? EPOLLIN : 0)
| (nev & EV_WRITE ? EPOLLOUT : 0);
if (epoll_ctl (epoll_fd, mode, fd, &ev))
if (epoll_ctl (backend_fd, mode, fd, &ev))
if (errno != ENOENT /* on ENOENT the fd went away, so try to do the right thing */
|| (nev && epoll_ctl (epoll_fd, EPOLL_CTL_ADD, fd, &ev)))
|| (nev && epoll_ctl (backend_fd, EPOLL_CTL_ADD, fd, &ev)))
fd_kill (EV_A_ fd);
}
@ -52,7 +52,7 @@ static void
epoll_poll (EV_P_ ev_tstamp timeout)
{
int i;
int eventcnt = epoll_wait (epoll_fd, epoll_events, epoll_eventmax, (int)ceil (timeout * 1000.));
int eventcnt = epoll_wait (backend_fd, epoll_events, epoll_eventmax, (int)ceil (timeout * 1000.));
if (eventcnt < 0)
{
@ -82,12 +82,12 @@ epoll_poll (EV_P_ ev_tstamp timeout)
static int
epoll_init (EV_P_ int flags)
{
epoll_fd = epoll_create (256);
backend_fd = epoll_create (256);
if (epoll_fd < 0)
if (backend_fd < 0)
return 0;
fcntl (epoll_fd, F_SETFD, FD_CLOEXEC);
fcntl (backend_fd, F_SETFD, FD_CLOEXEC);
backend_fudge = 1e-3; /* needed to compensate for epoll returning early */
backend_modify = epoll_modify;
@ -102,7 +102,7 @@ epoll_init (EV_P_ int flags)
static void
epoll_destroy (EV_P)
{
close (epoll_fd);
close (backend_fd);
ev_free (epoll_events);
}
@ -110,12 +110,12 @@ epoll_destroy (EV_P)
static void
epoll_fork (EV_P)
{
close (epoll_fd);
close (backend_fd);
while ((epoll_fd = epoll_create (256)) < 0)
while ((backend_fd = epoll_create (256)) < 0)
syserr ("(libev) epoll_create");
fcntl (epoll_fd, F_SETFD, FD_CLOEXEC);
fcntl (backend_fd, F_SETFD, FD_CLOEXEC);
fd_rearm_all (EV_A);
}

18
ev_kqueue.c
View File

@ -87,7 +87,7 @@ kqueue_poll (EV_P_ ev_tstamp timeout)
ts.tv_sec = (time_t)timeout;
ts.tv_nsec = (long)((timeout - (ev_tstamp)ts.tv_sec) * 1e9);
res = kevent (kqueue_fd, kqueue_changes, kqueue_changecnt, kqueue_events, kqueue_eventmax, &ts);
res = kevent (backend_fd, kqueue_changes, kqueue_changecnt, kqueue_events, kqueue_eventmax, &ts);
kqueue_changecnt = 0;
if (res < 0)
@ -156,10 +156,10 @@ kqueue_init (EV_P_ int flags)
struct kevent ch, ev;
/* Initalize the kernel queue */
if ((kqueue_fd = kqueue ()) < 0)
if ((backend_fd = kqueue ()) < 0)
return 0;
fcntl (kqueue_fd, F_SETFD, FD_CLOEXEC); /* not sure if necessary, hopefully doesn't hurt */
fcntl (backend_fd, F_SETFD, FD_CLOEXEC); /* not sure if necessary, hopefully doesn't hurt */
/* Check for Mac OS X kqueue bug. */
ch.ident = -1;
@ -171,12 +171,12 @@ kqueue_init (EV_P_ int flags)
* stick an error in ev. If kqueue is broken, then
* kevent will fail.
*/
if (kevent (kqueue_fd, &ch, 1, &ev, 1, 0) != 1
if (kevent (backend_fd, &ch, 1, &ev, 1, 0) != 1
|| ev.ident != -1
|| ev.flags != EV_ERROR)
{
/* detected broken kqueue */
close (kqueue_fd);
close (backend_fd);
return 0;
}
@ -197,7 +197,7 @@ kqueue_init (EV_P_ int flags)
static void
kqueue_destroy (EV_P)
{
close (kqueue_fd);
close (backend_fd);
ev_free (kqueue_events);
ev_free (kqueue_changes);
@ -206,12 +206,12 @@ kqueue_destroy (EV_P)
static void
kqueue_fork (EV_P)
{
close (kqueue_fd);
close (backend_fd);
while ((kqueue_fd = kqueue ()) < 0)
while ((backend_fd = kqueue ()) < 0)
syserr ("(libev) kqueue");
fcntl (kqueue_fd, F_SETFD, FD_CLOEXEC);
fcntl (backend_fd, F_SETFD, FD_CLOEXEC);
/* re-register interest in fds */
fd_rearm_all (EV_A);

18
ev_port.c
View File

@ -39,11 +39,11 @@ port_modify (EV_P_ int fd, int oev, int nev)
if (!nev)
{
if (oev)
port_dissociate (port_fd, PORT_SOURCE_FD, fd);
port_dissociate (backend_fd, PORT_SOURCE_FD, fd);
}
else if (0 >
port_associate (
port_fd, PORT_SOURCE_FD, fd,
backend_fd, PORT_SOURCE_FD, fd,
(nev & EV_READ ? POLLIN : 0)
| (nev & EV_WRITE ? POLLOUT : 0),
0
@ -66,7 +66,7 @@ port_poll (EV_P_ ev_tstamp timeout)
ts.tv_sec = (time_t)timeout;
ts.tv_nsec = (long)(timeout - (ev_tstamp)ts.tv_sec) * 1e9;
res = port_getn (port_fd, port_events, port_eventmax, &nget, &ts);
res = port_getn (backend_fd, port_events, port_eventmax, &nget, &ts);
if (res < 0)
{
@ -106,10 +106,10 @@ static int
port_init (EV_P_ int flags)
{
/* Initalize the kernel queue */
if ((port_fd = port_create ()) < 0)
if ((backend_fd = port_create ()) < 0)
return 0;
fcntl (port_fd, F_SETFD, FD_CLOEXEC); /* not sure if necessary, hopefully doesn't hurt */
fcntl (backend_fd, F_SETFD, FD_CLOEXEC); /* not sure if necessary, hopefully doesn't hurt */
backend_fudge = 1e-3; /* needed to compensate for port_getn returning early */
backend_modify = port_modify;
@ -124,7 +124,7 @@ port_init (EV_P_ int flags)
static void
port_destroy (EV_P)
{
close (port_fd);
close (backend_fd);
ev_free (port_events);
}
@ -132,12 +132,12 @@ port_destroy (EV_P)
static void
port_fork (EV_P)
{
close (port_fd);
close (backend_fd);
while ((port_fd = port_create ()) < 0)
while ((backend_fd = port_create ()) < 0)
syserr ("(libev) port");
fcntl (port_fd, F_SETFD, FD_CLOEXEC);
fcntl (backend_fd, F_SETFD, FD_CLOEXEC);
/* re-register interest in fds */
fd_rearm_all (EV_A);

5
ev_vars.h
View File

@ -8,6 +8,7 @@ VARx(int, backend)
VARx(ev_tstamp, backend_fudge) /* assumed typical timer resolution */
VAR (backend_modify, void (*backend_modify)(EV_P_ int fd, int oev, int nev))
VAR (backend_poll , void (*backend_poll)(EV_P_ ev_tstamp timeout))
VARx(int, backend_fd)
VARx(int, postfork) /* true if we need to recreate kernel state after fork */
VARx(int, activecnt) /* number of active events */
@ -29,14 +30,11 @@ VARx(int, pollidxmax)
#endif
#if EV_USE_EPOLL || EV_GENWRAP
VARx(int, epoll_fd)
VARx(struct epoll_event *, epoll_events)
VARx(int, epoll_eventmax)
#endif
#if EV_USE_KQUEUE || EV_GENWRAP
VARx(int, kqueue_fd)
VARx(struct kevent *, kqueue_changes)
VARx(int, kqueue_changemax)
VARx(int, kqueue_changecnt)
@ -45,7 +43,6 @@ VARx(int, kqueue_eventmax)
#endif
#if EV_USE_PORT || EV_GENWRAP
VARx(int, port_fd)
VARx(struct port_event *, port_events)
VARx(int, port_eventmax)
#endif

4
ev_wrap.h
View File

@ -6,6 +6,7 @@
#define backend_fudge ((loop)->backend_fudge)
#define backend_modify ((loop)->backend_modify)
#define backend_poll ((loop)->backend_poll)
#define backend_fd ((loop)->backend_fd)
#define postfork ((loop)->postfork)
#define activecnt ((loop)->activecnt)
#define vec_ri ((loop)->vec_ri)
@ -18,16 +19,13 @@
#define pollcnt ((loop)->pollcnt)
#define pollidxs ((loop)->pollidxs)
#define pollidxmax ((loop)->pollidxmax)
#define epoll_fd ((loop)->epoll_fd)
#define epoll_events ((loop)->epoll_events)
#define epoll_eventmax ((loop)->epoll_eventmax)
#define kqueue_fd ((loop)->kqueue_fd)
#define kqueue_changes ((loop)->kqueue_changes)
#define kqueue_changemax ((loop)->kqueue_changemax)
#define kqueue_changecnt ((loop)->kqueue_changecnt)
#define kqueue_events ((loop)->kqueue_events)
#define kqueue_eventmax ((loop)->kqueue_eventmax)
#define port_fd ((loop)->port_fd)
#define port_events ((loop)->port_events)
#define port_eventmax ((loop)->port_eventmax)
#define anfds ((loop)->anfds)