trunk/src/s_bsd_epoll.c

/*
 *  ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
 *
 *  Copyright (c) 2005-2015 ircd-hybrid development team
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
 *  USA
 */

/*! \file s_bsd_epoll.c
 * \brief Linux epoll() compatible network routines.
 * \version $Id$
 */

#include "stdinc.h"
#if USE_IOPOLL_MECHANISM == __IOPOLL_MECHANISM_EPOLL
#include "fdlist.h"
#include "ircd.h"
#include "s_bsd.h"
#include "log.h"
#include <sys/epoll.h>
#include <sys/syscall.h>

static fde_t efd;


/*
 * init_netio
 *
 * This is a needed exported function which will be called to initialise
 * the network loop code.
 */
void
init_netio(void)
{
  int fd;

  if ((fd = epoll_create(hard_fdlimit)) < 0)
  {
    ilog(LOG_TYPE_IRCD, "init_netio: Couldn't open epoll fd - %d: %s",
         errno, strerror(errno));
    exit(115); /* Whee! */
  }

  fd_open(&efd, fd, 0, "epoll file descriptor");
}

/*
 * comm_setselect
 *
 * This is a needed exported function which will be called to register
 * and deregister interest in a pending IO state for a given FD.
 */
void
comm_setselect(fde_t *F, unsigned int type, void (*handler)(fde_t *, void *),
               void *client_data, time_t timeout)
{
  int new_events, op;
  struct epoll_event ep_event = { 0, { 0 } };

  if ((type & COMM_SELECT_READ))
  {
    F->read_handler = handler;
    F->read_data = client_data;
  }

  if ((type & COMM_SELECT_WRITE))
  {
    F->write_handler = handler;
    F->write_data = client_data;
  }

  new_events = (F->read_handler ? EPOLLIN : 0) |
    (F->write_handler ? EPOLLOUT : 0);

  if (timeout != 0)
  {
    F->timeout = CurrentTime + (timeout / 1000);
    F->timeout_handler = handler;
    F->timeout_data = client_data;
  }

  if (new_events != F->evcache)
  {
    if (new_events == 0)
      op = EPOLL_CTL_DEL;
    else if (F->evcache == 0)
      op = EPOLL_CTL_ADD;
    else
      op = EPOLL_CTL_MOD;

    ep_event.events = F->evcache = new_events;
    ep_event.data.fd = F->fd;

    if (epoll_ctl(efd.fd, op, F->fd, &ep_event) != 0)
    {
      ilog(LOG_TYPE_IRCD, "comm_setselect: epoll_ctl() failed: %s", strerror(errno));
      abort();
    }
  }
}

/*
 * comm_select()
 *
 * Called to do the new-style IO, courtesy of of squid (like most of this
 * new IO code). This routine handles the stuff we've hidden in
 * comm_setselect and fd_table[] and calls callbacks for IO ready
 * events.
 */
void
comm_select(void)
{
  struct epoll_event ep_fdlist[128];
  int num, i;
  void (*hdl)(fde_t *, void *);
  fde_t *F;

  num = epoll_wait(efd.fd, ep_fdlist, 128, SELECT_DELAY);

  set_time();

  if (num < 0)
  {
    const struct timespec req = { .tv_sec = 0, .tv_nsec = 50000000 };
    nanosleep(&req, NULL);  /* Avoid 99% CPU in comm_select */
    return;
  }

  for (i = 0; i < num; i++)
  {
    F = lookup_fd(ep_fdlist[i].data.fd);
    if (F == NULL || !F->flags.open)
      continue;

    if ((ep_fdlist[i].events & (EPOLLIN | EPOLLHUP | EPOLLERR)))
    {
      if ((hdl = F->read_handler))
      {
        F->read_handler = NULL;
        hdl(F, F->read_data);
        if (!F->flags.open)
          continue;
      }
    }

    if ((ep_fdlist[i].events & (EPOLLOUT | EPOLLHUP | EPOLLERR)))
    {
      if ((hdl = F->write_handler))
      {
        F->write_handler = NULL;
        hdl(F, F->write_data);
        if (!F->flags.open)
          continue;
      }
    }

    comm_setselect(F, 0, NULL, NULL, 0);
  }
}
#endif
Revision:	6542
Committed:	Wed Sep 16 11:01:51 2015 UTC (9 years, 11 months ago) by michael
Content type:	text/x-csrc
File size:	4106 byte(s)
Log Message:	- Replace obsolete usleep() with nanosleep()
#	User	Rev	Content
1	adx	30	/*
2	michael	2916	* ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
3	adx	30	*
4	michael	5347	* Copyright (c) 2005-2015 ircd-hybrid development team
5	adx	30	*
6			* This program is free software; you can redistribute it and/or modify
7			* it under the terms of the GNU General Public License as published by
8			* the Free Software Foundation; either version 2 of the License, or
9			* (at your option) any later version.
10			*
11			* This program is distributed in the hope that it will be useful,
12			* but WITHOUT ANY WARRANTY; without even the implied warranty of
13			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14			* GNU General Public License for more details.
15			*
16			* You should have received a copy of the GNU General Public License
17			* along with this program; if not, write to the Free Software
18	michael	4565	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
19	adx	30	* USA
20			*/
21
22	michael	2916	/*! \file s_bsd_epoll.c
23			* \brief Linux epoll() compatible network routines.
24			* \version $Id$
25			*/
26
27	adx	30	#include "stdinc.h"
28	stu	908	#if USE_IOPOLL_MECHANISM == __IOPOLL_MECHANISM_EPOLL
29	adx	30	#include "fdlist.h"
30			#include "ircd.h"
31			#include "s_bsd.h"
32	michael	1309	#include "log.h"
33	adx	30	#include <sys/epoll.h>
34			#include <sys/syscall.h>
35
36			static fde_t efd;
37
38
39			/*
40			* init_netio
41			*
42			* This is a needed exported function which will be called to initialise
43			* the network loop code.
44			*/
45			void
46			init_netio(void)
47			{
48			int fd;
49
50			if ((fd = epoll_create(hard_fdlimit)) < 0)
51			{
52	michael	1247	ilog(LOG_TYPE_IRCD, "init_netio: Couldn't open epoll fd - %d: %s",
53	adx	30	errno, strerror(errno));
54			exit(115); /* Whee! */
55			}
56
57			fd_open(&efd, fd, 0, "epoll file descriptor");
58			}
59
60			/*
61			* comm_setselect
62			*
63			* This is a needed exported function which will be called to register
64			* and deregister interest in a pending IO state for a given FD.
65			*/
66			void
67	michael	4461	comm_setselect(fde_t F, unsigned int type, void (handler)(fde_t , void ),
68	adx	30	void *client_data, time_t timeout)
69			{
70			int new_events, op;
71	michael	966	struct epoll_event ep_event = { 0, { 0 } };
72	adx	30
73			if ((type & COMM_SELECT_READ))
74			{
75			F->read_handler = handler;
76			F->read_data = client_data;
77			}
78
79			if ((type & COMM_SELECT_WRITE))
80			{
81			F->write_handler = handler;
82			F->write_data = client_data;
83			}
84
85			new_events = (F->read_handler ? EPOLLIN : 0) \|
86			(F->write_handler ? EPOLLOUT : 0);
87
88			if (timeout != 0)
89	michael	2725	{
90	adx	30	F->timeout = CurrentTime + (timeout / 1000);
91	michael	2725	F->timeout_handler = handler;
92			F->timeout_data = client_data;
93			}
94	adx	30
95			if (new_events != F->evcache)
96			{
97			if (new_events == 0)
98			op = EPOLL_CTL_DEL;
99			else if (F->evcache == 0)
100			op = EPOLL_CTL_ADD;
101			else
102			op = EPOLL_CTL_MOD;
103
104			ep_event.events = F->evcache = new_events;
105			ep_event.data.fd = F->fd;
106
107			if (epoll_ctl(efd.fd, op, F->fd, &ep_event) != 0)
108			{
109	michael	1247	ilog(LOG_TYPE_IRCD, "comm_setselect: epoll_ctl() failed: %s", strerror(errno));
110	adx	30	abort();
111			}
112			}
113			}
114
115			/*
116			* comm_select()
117			*
118			* Called to do the new-style IO, courtesy of of squid (like most of this
119			* new IO code). This routine handles the stuff we've hidden in
120			* comm_setselect and fd_table[] and calls callbacks for IO ready
121			* events.
122			*/
123			void
124			comm_select(void)
125			{
126			struct epoll_event ep_fdlist[128];
127			int num, i;
128	michael	4461	void (hdl)(fde_t , void *);
129	adx	30	fde_t *F;
130
131			num = epoll_wait(efd.fd, ep_fdlist, 128, SELECT_DELAY);
132
133			set_time();
134
135			if (num < 0)
136			{
137	michael	6542	const struct timespec req = { .tv_sec = 0, .tv_nsec = 50000000 };
138			nanosleep(&req, NULL); /* Avoid 99% CPU in comm_select */
139	adx	30	return;
140			}
141
142			for (i = 0; i < num; i++)
143			{
144			F = lookup_fd(ep_fdlist[i].data.fd);
145			if (F == NULL \|\| !F->flags.open)
146			continue;
147
148			if ((ep_fdlist[i].events & (EPOLLIN \| EPOLLHUP \| EPOLLERR)))
149	michael	2650	{
150	michael	5902	if ((hdl = F->read_handler))
151	adx	30	{
152			F->read_handler = NULL;
153			hdl(F, F->read_data);
154	michael	2650	if (!F->flags.open)
155			continue;
156	adx	30	}
157	michael	2650	}
158	adx	30
159			if ((ep_fdlist[i].events & (EPOLLOUT \| EPOLLHUP \| EPOLLERR)))
160	michael	2650	{
161	michael	5902	if ((hdl = F->write_handler))
162	adx	30	{
163			F->write_handler = NULL;
164			hdl(F, F->write_data);
165	michael	2650	if (!F->flags.open)
166			continue;
167	adx	30	}
168	michael	2650	}
169	adx	30
170			comm_setselect(F, 0, NULL, NULL, 0);
171			}
172			}
173	stu	908	#endif