libev/ev_epoll.c

#include <sys/epoll.h>

static int epoll_fd = -1;

static void
epoll_modify (int fd, int oev, int nev)
{
  int mode = nev ? oev ? EPOLL_CTL_MOD : EPOLL_CTL_ADD : EPOLL_CTL_DEL;

  struct epoll_event ev;
  ev.data.fd = fd;
  ev.events =
      (nev & EV_READ ? EPOLLIN : 0)
      | (nev & EV_WRITE ? EPOLLOUT : 0);

  fprintf (stderr, "reify %d,%d,%d m%d (r=%d)\n", fd, oev, nev, mode,//D
  epoll_ctl (epoll_fd, mode, fd, &ev)
  );//D
}

void epoll_postfork_child (void)
{
  int fd;

  epoll_fd = epoll_create (256);

  /* re-register interest in fds */
  for (fd = 0; fd < anfdmax; ++fd)
    if (anfds [fd].wev)
      epoll_modify (fd, EV_NONE, anfds [fd].wev);
}

static struct epoll_event *events;
static int eventmax;

static void epoll_poll (ev_tstamp timeout)
{
  int eventcnt = epoll_wait (epoll_fd, events, eventmax, ceil (timeout * 1000.));
  int i;

  if (eventcnt < 0)
    return;

  for (i = 0; i < eventcnt; ++i)
    fd_event (
      events [i].data.fd,
      (events [i].events & (EPOLLOUT | EPOLLERR | EPOLLHUP) ? EV_WRITE : 0)
      | (events [i].events & (EPOLLIN | EPOLLERR | EPOLLHUP) ? EV_READ : 0)
    );

  /* if the receive array was full, increase its size */
  if (eventcnt == eventmax)
    {
      free (events);
      eventmax += eventmax >> 1;
      events = malloc (sizeof (struct epoll_event) * eventmax);
    }
}

int epoll_init (int flags)
{
  epoll_fd = epoll_create (256);

  if (epoll_fd < 0)
    return 0;

  ev_method = EVMETHOD_EPOLL;
  method_fudge  = 1e-3; /* needed to compensate for epoll returning early */
  method_modify = epoll_modify;
  method_poll   = epoll_poll;

  eventmax = 64; /* intiial number of events receivable per poll */
  events = malloc (sizeof (struct epoll_event) * eventmax);

  return 1;
}
Revision:	1.2
Committed:	Tue Oct 30 23:54:38 2007 UTC (16 years, 6 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.1:	+21 -34 lines
Log Message:	implement select method
#	User	Rev	Content
1	root	1.1	#include <sys/epoll.h>
2
3			static int epoll_fd = -1;
4
5			static void
6	root	1.2	epoll_modify (int fd, int oev, int nev)
7	root	1.1	{
8	root	1.2	int mode = nev ? oev ? EPOLL_CTL_MOD : EPOLL_CTL_ADD : EPOLL_CTL_DEL;
9	root	1.1
10	root	1.2	struct epoll_event ev;
11			ev.data.fd = fd;
12			ev.events =
13			(nev & EV_READ ? EPOLLIN : 0)
14			\| (nev & EV_WRITE ? EPOLLOUT : 0);
15
16			fprintf (stderr, "reify %d,%d,%d m%d (r=%d)\n", fd, oev, nev, mode,//D
17			epoll_ctl (epoll_fd, mode, fd, &ev)
18			);//D
19	root	1.1	}
20
21			void epoll_postfork_child (void)
22			{
23	root	1.2	int fd;
24	root	1.1
25			epoll_fd = epoll_create (256);
26
27	root	1.2	/* re-register interest in fds */
28			for (fd = 0; fd < anfdmax; ++fd)
29			if (anfds [fd].wev)
30			epoll_modify (fd, EV_NONE, anfds [fd].wev);
31	root	1.1	}
32
33			static struct epoll_event *events;
34			static int eventmax;
35
36			static void epoll_poll (ev_tstamp timeout)
37			{
38			int eventcnt = epoll_wait (epoll_fd, events, eventmax, ceil (timeout * 1000.));
39			int i;
40
41			if (eventcnt < 0)
42			return;
43
44			for (i = 0; i < eventcnt; ++i)
45			fd_event (
46			events [i].data.fd,
47	root	1.2	(events [i].events & (EPOLLOUT \| EPOLLERR \| EPOLLHUP) ? EV_WRITE : 0)
48			\| (events [i].events & (EPOLLIN \| EPOLLERR \| EPOLLHUP) ? EV_READ : 0)
49	root	1.1	);
50
51			/* if the receive array was full, increase its size */
52			if (eventcnt == eventmax)
53			{
54			free (events);
55			eventmax += eventmax >> 1;
56			events = malloc (sizeof (struct epoll_event) * eventmax);
57			}
58			}
59
60			int epoll_init (int flags)
61			{
62			epoll_fd = epoll_create (256);
63
64			if (epoll_fd < 0)
65			return 0;
66
67			ev_method = EVMETHOD_EPOLL;
68	root	1.2	method_fudge = 1e-3; /* needed to compensate for epoll returning early */
69			method_modify = epoll_modify;
70			method_poll = epoll_poll;
71	root	1.1
72			eventmax = 64; /* intiial number of events receivable per poll */
73			events = malloc (sizeof (struct epoll_event) * eventmax);
74
75			return 1;
76			}