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renamed METHODs to BACKENDs 

add ev_supported_backends and ev_recommended_backends functions.
This commit is contained in:
Marc Alexander Lehmann 2007-11-23 05:00:44 +00:00
parent 46b853611d
commit 04e7d47934
8 changed files with 113 additions and 75 deletions
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78
ev.c
View File

@ -156,12 +156,6 @@ extern "C" {
/**/
/* darwin simply cannot be helped */
#ifdef __APPLE__
# undef EV_USE_POLL
# undef EV_USE_KQUEUE
#endif
#ifndef CLOCK_MONOTONIC
# undef EV_USE_MONOTONIC
# define EV_USE_MONOTONIC 0
@ -787,9 +781,40 @@ enable_secure (void)
}
unsigned int
ev_method (EV_P)
ev_supported_backends (void)
{
return method;
}
unsigned int
ev_recommended_backends (void)
{
unsigned int flags;
if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
return flags;
}
unsigned int
ev_backend (EV_P)
{
unsigned int flags = ev_recommended_backends ();
#ifndef __NetBSD__
/* kqueue is borked on everything but netbsd apparently */
/* it usually doesn't work correctly on anything but sockets and pipes */
flags &= ~EVBACKEND_KQUEUE;
#endif
#ifdef __APPLE__
// flags &= ~EVBACKEND_KQUEUE; for documentation
flags &= ~EVBACKEND_POLL;
#endif
return flags;
}
static void
@ -815,31 +840,24 @@ loop_init (EV_P_ unsigned int flags)
&& getenv ("LIBEV_FLAGS"))
flags = atoi (getenv ("LIBEV_FLAGS"));
if (!(flags & EVMETHOD_ALL))
{
flags |= EVMETHOD_ALL;
#if EV_USE_KQUEUE && !defined (__NetBSD__)
/* kqueue is borked on everything but netbsd apparently */
/* it usually doesn't work correctly on anything but sockets and pipes */
flags &= ~EVMETHOD_KQUEUE;
#endif
}
if (!(flags & 0x0000ffffUL))
flags |= ev_recommended_backends ();
method = 0;
#if EV_USE_PORT
if (!method && (flags & EVMETHOD_PORT )) method = port_init (EV_A_ flags);
if (!method && (flags & EVBACKEND_PORT )) method = port_init (EV_A_ flags);
#endif
#if EV_USE_KQUEUE
if (!method && (flags & EVMETHOD_KQUEUE)) method = kqueue_init (EV_A_ flags);
if (!method && (flags & EVBACKEND_KQUEUE)) method = kqueue_init (EV_A_ flags);
#endif
#if EV_USE_EPOLL
if (!method && (flags & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ flags);
if (!method && (flags & EVBACKEND_EPOLL )) method = epoll_init (EV_A_ flags);
#endif
#if EV_USE_POLL
if (!method && (flags & EVMETHOD_POLL )) method = poll_init (EV_A_ flags);
if (!method && (flags & EVBACKEND_POLL )) method = poll_init (EV_A_ flags);
#endif
#if EV_USE_SELECT
if (!method && (flags & EVMETHOD_SELECT)) method = select_init (EV_A_ flags);
if (!method && (flags & EVBACKEND_SELECT)) method = select_init (EV_A_ flags);
#endif
ev_init (&sigev, sigcb);
@ -853,19 +871,19 @@ loop_destroy (EV_P)
int i;
#if EV_USE_PORT
if (method == EVMETHOD_PORT ) port_destroy (EV_A);
if (method == EVBACKEND_PORT ) port_destroy (EV_A);
#endif
#if EV_USE_KQUEUE
if (method == EVMETHOD_KQUEUE) kqueue_destroy (EV_A);
if (method == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
#endif
#if EV_USE_EPOLL
if (method == EVMETHOD_EPOLL ) epoll_destroy (EV_A);
if (method == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
#endif
#if EV_USE_POLL
if (method == EVMETHOD_POLL ) poll_destroy (EV_A);
if (method == EVBACKEND_POLL ) poll_destroy (EV_A);
#endif
#if EV_USE_SELECT
if (method == EVMETHOD_SELECT) select_destroy (EV_A);
if (method == EVBACKEND_SELECT) select_destroy (EV_A);
#endif
for (i = NUMPRI; i--; )
@ -888,13 +906,13 @@ static void
loop_fork (EV_P)
{
#if EV_USE_PORT
if (method == EVMETHOD_PORT ) port_fork (EV_A);
if (method == EVBACKEND_PORT ) port_fork (EV_A);
#endif
#if EV_USE_KQUEUE
if (method == EVMETHOD_KQUEUE) kqueue_fork (EV_A);
if (method == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
#endif
#if EV_USE_EPOLL
if (method == EVMETHOD_EPOLL ) epoll_fork (EV_A);
if (method == EVBACKEND_EPOLL ) epoll_fork (EV_A);
#endif
if (ev_is_active (&sigev))

50
ev.h
View File

@ -71,18 +71,18 @@ struct ev_loop;
#endif
/* eventmask, revents, events... */
#define EV_UNDEF -1 /* guaranteed to be invalid */
#define EV_NONE 0x00
#define EV_READ 0x01 /* io only */
#define EV_WRITE 0x02 /* io only */
#define EV_TIMEOUT 0x000100 /* timer only */
#define EV_PERIODIC 0x000200 /* periodic timer only */
#define EV_SIGNAL 0x000400 /* signal only */
#define EV_IDLE 0x000800 /* idle only */
#define EV_CHECK 0x001000 /* check only */
#define EV_PREPARE 0x002000 /* prepare only */
#define EV_CHILD 0x004000 /* child/pid only */
#define EV_ERROR 0x800000 /* sent when an error occurs */
#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
@ -233,24 +233,24 @@ union ev_any_watcher
/* bits for ev_default_loop and ev_loop_new */
/* the default */
#define EVFLAG_AUTO 0x00000000 /* not quite a mask */
/* method bits to be ored together */
#define EVMETHOD_SELECT 0x00000001 /* about anywhere */
#define EVMETHOD_POLL 0x00000002 /* !win */
#define EVMETHOD_EPOLL 0x00000004 /* linux */
#define EVMETHOD_KQUEUE 0x00000008 /* bsd */
#define EVMETHOD_DEVPOLL 0x00000010 /* solaris 8 */ /* NYI */
#define EVMETHOD_PORT 0x00000020 /* solaris 10 */
#define EVMETHOD_ALL 0x0000ffff /* all methods, also future ones, or so */
#define EVFLAG_AUTO 0x00000000UL /* not quite a mask */
/* flag bits */
#define EVFLAG_NOENV 0x01000000 /* do NOT consult environment */
#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
int ev_version_major (void);
int ev_version_minor (void);
unsigned int ev_supported_backends (void);
unsigned int ev_recommended_backends (void);
ev_tstamp ev_time (void);
/* Sets the allocation function to use, works like realloc.
@ -309,7 +309,7 @@ void ev_default_destroy (void); /* destroy the default loop */
/* you can actually call it at any time, anywhere :) */
void ev_default_fork (void);
unsigned int ev_method (EV_P);
unsigned int ev_backend (EV_P);
#endif
#define EVLOOP_NONBLOCK 1 /* do not block/wait */

50
ev.pod
View File

@ -77,6 +77,22 @@ as this indicates an incompatible change. Minor versions are usually
compatible to older versions, so a larger minor version alone is usually
not a problem.
=item unsigned int ev_supported_backends ()
Return the set of all backends (i.e. their corresponding C<EV_BACKEND_*>
value) compiled into this binary of libev (independent of their
availability on the system you are running on). See C<ev_default_loop> for
a description of the set values.
=item unsigned int ev_recommended_backends ()
Return the set of all backends compiled into this binary of libev and also
recommended for this platform. This set is often smaller than the one
returned by C<ev_supported_backends>, as for example kqueue is broken on
most BSDs and will not be autodetected unless you explicitly request it
(assuming you know what you are doing). This is the set of backends that
C<EVFLAG_AUTO> will probe for.
=item ev_set_allocator (void *(*cb)(void *ptr, long size))
Sets the allocation function to use (the prototype is similar to the
@ -121,13 +137,13 @@ done correctly, because it's hideous and inefficient).
This will initialise the default event loop if it hasn't been initialised
yet and return it. If the default loop could not be initialised, returns
false. If it already was initialised it simply returns it (and ignores the
flags).
flags. If that is troubling you, check C<ev_backend ()> afterwards).
If you don't know what event loop to use, use the one returned from this
function.
The flags argument can be used to specify special behaviour or specific
backends to use, and is usually specified as 0 (or EVFLAG_AUTO).
backends to use, and is usually specified as C<0> (or EVFLAG_AUTO).
It supports the following flags:
@ -147,7 +163,7 @@ override the flags completely if it is found in the environment. This is
useful to try out specific backends to test their performance, or to work
around bugs.
=item C<EVMETHOD_SELECT> (value 1, portable select backend)
=item C<EVBACKEND_SELECT> (value 1, portable select backend)
This is your standard select(2) backend. Not I<completely> standard, as
libev tries to roll its own fd_set with no limits on the number of fds,
@ -155,14 +171,14 @@ but if that fails, expect a fairly low limit on the number of fds when
using this backend. It doesn't scale too well (O(highest_fd)), but its usually
the fastest backend for a low number of fds.
=item C<EVMETHOD_POLL> (value 2, poll backend, available everywhere except on windows)
=item C<EVBACKEND_POLL> (value 2, poll backend, available everywhere except on windows)
And this is your standard poll(2) backend. It's more complicated than
select, but handles sparse fds better and has no artificial limit on the
number of fds you can use (except it will slow down considerably with a
lot of inactive fds). It scales similarly to select, i.e. O(total_fds).
=item C<EVMETHOD_EPOLL> (value 4, Linux)
=item C<EVBACKEND_EPOLL> (value 4, Linux)
For few fds, this backend is a bit little slower than poll and select,
but it scales phenomenally better. While poll and select usually scale like
@ -175,7 +191,7 @@ result in some caching, there is still a syscall per such incident
best to avoid that. Also, dup()ed file descriptors might not work very
well if you register events for both fds.
=item C<EVMETHOD_KQUEUE> (value 8, most BSD clones)
=item C<EVBACKEND_KQUEUE> (value 8, most BSD clones)
Kqueue deserves special mention, as at the time of this writing, it
was broken on all BSDs except NetBSD (usually it doesn't work with
@ -189,20 +205,20 @@ course). While starting and stopping an I/O watcher does not cause an
extra syscall as with epoll, it still adds up to four event changes per
incident, so its best to avoid that.
=item C<EVMETHOD_DEVPOLL> (value 16, Solaris 8)
=item C<EVBACKEND_DEVPOLL> (value 16, Solaris 8)
This is not implemented yet (and might never be).
=item C<EVMETHOD_PORT> (value 32, Solaris 10)
=item C<EVBACKEND_PORT> (value 32, Solaris 10)
This uses the Solaris 10 port mechanism. As with everything on Solaris,
it's really slow, but it still scales very well (O(active_fds)).
=item C<EVMETHOD_ALL>
=item C<EVBACKEND_ALL>
Try all backends (even potentially broken ones that wouldn't be tried
with C<EVFLAG_AUTO>). Since this is a mask, you can do stuff such as
C<EVMETHOD_ALL & ~EVMETHOD_KQUEUE>.
C<EVBACKEND_ALL & ~EVBACKEND_KQUEUE>.
=back
@ -246,15 +262,19 @@ quite nicely into a call to C<pthread_atfork>:
pthread_atfork (0, 0, ev_default_fork);
At the moment, C<EVBACKEND_SELECT> and C<EVBACKEND_POLL> are safe to use
without calling this function, so if you force one of those backends you
do not need to care.
=item ev_loop_fork (loop)
Like C<ev_default_fork>, but acts on an event loop created by
C<ev_loop_new>. Yes, you have to call this on every allocated event loop
after fork, and how you do this is entirely your own problem.
=item unsigned int ev_method (loop)
=item unsigned int ev_backend (loop)
Returns one of the C<EVMETHOD_*> flags indicating the event backend in
Returns one of the C<EVBACKEND_*> flags indicating the event backend in
use.
=item ev_tstamp ev_now (loop)
@ -370,7 +390,7 @@ corresponding stop function (C<< ev_<type>_stop (loop, watcher *) >>.
As long as your watcher is active (has been started but not stopped) you
must not touch the values stored in it. Most specifically you must never
reinitialise it or call its set method.
reinitialise it or call its set macro.
You can check whether an event is active by calling the C<ev_is_active
(watcher *)> macro. To see whether an event is outstanding (but the
@ -497,8 +517,8 @@ to the same underlying file/socket etc. description (that is, they share
the same underlying "file open").
If you must do this, then force the use of a known-to-be-good backend
(at the time of this writing, this includes only EVMETHOD_SELECT and
EVMETHOD_POLL).
(at the time of this writing, this includes only C<EVBACKEND_SELECT> and
C<EVBACKEND_POLL>).
=over 4

2
ev_epoll.c
View File

@ -96,7 +96,7 @@ epoll_init (EV_P_ int flags)
epoll_eventmax = 64; /* intiial number of events receivable per poll */
epoll_events = (struct epoll_event *)ev_malloc (sizeof (struct epoll_event) * epoll_eventmax);
return EVMETHOD_EPOLL;
return EVBACKEND_EPOLL;
}
static void

2
ev_kqueue.c
View File

@ -193,7 +193,7 @@ kqueue_init (EV_P_ int flags)
kqueue_changemax = 0;
kqueue_changecnt = 0;
return EVMETHOD_KQUEUE;
return EVBACKEND_KQUEUE;
}
static void

2
ev_poll.c
View File

@ -115,7 +115,7 @@ poll_init (EV_P_ int flags)
pollidxs = 0; pollidxmax = 0;
polls = 0; pollmax = 0; pollcnt = 0;
return EVMETHOD_POLL;
return EVBACKEND_POLL;
}
static void

2
ev_port.c
View File

@ -118,7 +118,7 @@ port_init (EV_P_ int flags)
port_eventmax = 64; /* intiial number of events receivable per poll */
port_events = (port_event_t *)ev_malloc (sizeof (port_event_t) * port_eventmax);
return EVMETHOD_PORT;
return EVBACKEND_PORT;
}
static void

2
ev_select.c
View File

@ -221,7 +221,7 @@ select_init (EV_P_ int flags)
vec_wo = 0;
#endif
return EVMETHOD_SELECT;
return EVBACKEND_SELECT;
}
static void