trunk/src/s_bsd_kqueue.c

/*
 *  ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
 *
 *  Copyright (c) 2000-2018 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_kqueue.c
 * \brief kqueue() compatible network routines.
 * \version $Id$
 */

#include "stdinc.h"
#if USE_IOPOLL_MECHANISM == __IOPOLL_MECHANISM_KQUEUE
#include <sys/event.h>
#include "fdlist.h"
#include "ircd.h"
#include "s_bsd.h"
#include "log.h"

enum { KE_LENGTH = 128 };

static int kqueue_fd;
static struct kevent kq_fdlist[KE_LENGTH];  /* kevent buffer */
static int kqoff;      /* offset into the buffer */


/*
 * netio_init
 *
 * This is a needed exported function which will be called to initialise
 * the network loop code.
 */
void
netio_init(void)
{
  if ((kqueue_fd = kqueue()) < 0)
  {
    ilog(LOG_TYPE_IRCD, "netio_init: couldn't open kqueue fd: %s", strerror(errno));
    exit(EXIT_FAILURE); /* Whee! */
  }

  fd_open(kqueue_fd, 0, "kqueue() file descriptor");
}

/*
 * Write a single update to the kqueue list.
 */
static void
kq_update_events(int fd, int filter, int what)
{
  const struct timespec zero_timespec = { .tv_sec = 0, .tv_nsec = 0 };
  struct kevent *kep = kq_fdlist + kqoff;

  EV_SET(kep, (uintptr_t) fd, (short) filter, what, 0, 0, NULL);

  if (++kqoff == KE_LENGTH)
  {
    int i;

    for (i = 0; i < kqoff; ++i)
      kevent(kqueue_fd, &kq_fdlist[i], 1, NULL, 0, &zero_timespec);
    kqoff = 0;
  }
}

/*
 * 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, uintmax_t timeout)
{
  int new_events, diff;

  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 ? COMM_SELECT_READ : 0) |
               (F->write_handler ? COMM_SELECT_WRITE : 0);

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

  diff = new_events ^ F->evcache;

  if ((diff & COMM_SELECT_READ))
    kq_update_events(F->fd, EVFILT_READ,
      (new_events & COMM_SELECT_READ) ? EV_ADD : EV_DELETE);
  if ((diff & COMM_SELECT_WRITE))
    kq_update_events(F->fd, EVFILT_WRITE,
      (new_events & COMM_SELECT_WRITE) ? EV_ADD : EV_DELETE);

  F->evcache = new_events;
}

/*
 * comm_select
 *
 * Called to do the new-style IO, courtesy 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)
{
  int num, i;
  static struct kevent ke[KE_LENGTH];
  struct timespec poll_time;
  void (*hdl)(fde_t *, void *);

  /*
   * remember we are doing NANOseconds here, not micro/milli. God knows
   * why jlemon used a timespec, but hey, he wrote the interface, not I
   *   -- Adrian
   */
  poll_time.tv_sec = 0;
  poll_time.tv_nsec = SELECT_DELAY * 1000000;
  num = kevent(kqfd.fd, kq_fdlist, kqoff, ke, KE_LENGTH, &poll_time);
  kqoff = 0;

  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++)
  {
    fde_t *F = &fd_table[ke[i].ident];

    if (F->flags.open == 0 || (ke[i].flags & EV_ERROR))
      continue;

    if (ke[i].filter == EVFILT_READ)
    {
      if ((hdl = F->read_handler) != NULL)
      {
        F->read_handler = NULL;
        hdl(F, F->read_data);

        if (F->flags.open == 0)
          continue;
      }
    }

    if (ke[i].filter == EVFILT_WRITE)
    {
      if ((hdl = F->write_handler) != NULL)
      {
        F->write_handler = NULL;
        hdl(F, F->write_data);

        if (F->flags.open == 0)
          continue;
      }
    }

    comm_setselect(F, 0, NULL, NULL, 0);
  }
}
#endif
Revision:	8341
Committed:	Sat Mar 3 23:13:25 2018 UTC (8 years, 7 months ago) by michael
Content type:	text/x-csrc
File size:	4819 byte(s)
Log Message:	- s_bsd_kqueue.c:comm_select(): fixed build
#	User	Rev	Content
1	adx	30	/*
2	michael	2916	* ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
3	adx	30	*
4	michael	8279	* Copyright (c) 2000-2018 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_kqueue.c
23			* \brief kqueue() compatible network routines.
24			* \version $Id$
25			*/
26
27	adx	30	#include "stdinc.h"
28	stu	908	#if USE_IOPOLL_MECHANISM == __IOPOLL_MECHANISM_KQUEUE
29	adx	30	#include <sys/event.h>
30			#include "fdlist.h"
31			#include "ircd.h"
32			#include "s_bsd.h"
33	michael	1309	#include "log.h"
34	adx	30
35	michael	6350	enum { KE_LENGTH = 128 };
36	adx	30
37	michael	8339	static int kqueue_fd;
38	adx	30	static struct kevent kq_fdlist[KE_LENGTH]; /* kevent buffer */
39			static int kqoff; /* offset into the buffer */
40
41	michael	3984
42	adx	30	/*
43	michael	7566	* netio_init
44	adx	30	*
45			* This is a needed exported function which will be called to initialise
46			* the network loop code.
47			*/
48			void
49	michael	7566	netio_init(void)
50	adx	30	{
51	michael	8339	if ((kqueue_fd = kqueue()) < 0)
52	adx	30	{
53	michael	7566	ilog(LOG_TYPE_IRCD, "netio_init: couldn't open kqueue fd: %s", strerror(errno));
54	michael	6553	exit(EXIT_FAILURE); /* Whee! */
55	adx	30	}
56
57	michael	8339	fd_open(kqueue_fd, 0, "kqueue() file descriptor");
58	adx	30	}
59
60			/*
61			* Write a single update to the kqueue list.
62			*/
63			static void
64			kq_update_events(int fd, int filter, int what)
65			{
66	michael	7760	const struct timespec zero_timespec = { .tv_sec = 0, .tv_nsec = 0 };
67	adx	30	struct kevent *kep = kq_fdlist + kqoff;
68
69			EV_SET(kep, (uintptr_t) fd, (short) filter, what, 0, 0, NULL);
70
71	adx	842	if (++kqoff == KE_LENGTH)
72	adx	30	{
73	michael	2589	int i;
74
75			for (i = 0; i < kqoff; ++i)
76	michael	8339	kevent(kqueue_fd, &kq_fdlist[i], 1, NULL, 0, &zero_timespec);
77	adx	30	kqoff = 0;
78			}
79			}
80
81			/*
82			* comm_setselect
83			*
84			* This is a needed exported function which will be called to register
85			* and deregister interest in a pending IO state for a given FD.
86			*/
87			void
88	michael	4461	comm_setselect(fde_t F, unsigned int type, void (handler)(fde_t , void ),
89	michael	7330	void *client_data, uintmax_t timeout)
90	adx	30	{
91			int new_events, diff;
92
93			if ((type & COMM_SELECT_READ))
94			{
95			F->read_handler = handler;
96			F->read_data = client_data;
97			}
98
99			if ((type & COMM_SELECT_WRITE))
100			{
101			F->write_handler = handler;
102			F->write_data = client_data;
103			}
104
105			new_events = (F->read_handler ? COMM_SELECT_READ : 0) \|
106	michael	2650	(F->write_handler ? COMM_SELECT_WRITE : 0);
107	adx	30
108			if (timeout != 0)
109	michael	2725	{
110	adx	30	F->timeout = CurrentTime + (timeout / 1000);
111	michael	2725	F->timeout_handler = handler;
112			F->timeout_data = client_data;
113			}
114	adx	30
115			diff = new_events ^ F->evcache;
116
117			if ((diff & COMM_SELECT_READ))
118			kq_update_events(F->fd, EVFILT_READ,
119			(new_events & COMM_SELECT_READ) ? EV_ADD : EV_DELETE);
120			if ((diff & COMM_SELECT_WRITE))
121			kq_update_events(F->fd, EVFILT_WRITE,
122			(new_events & COMM_SELECT_WRITE) ? EV_ADD : EV_DELETE);
123
124			F->evcache = new_events;
125			}
126
127			/*
128			* comm_select
129			*
130			* Called to do the new-style IO, courtesy of squid (like most of this
131			* new IO code). This routine handles the stuff we've hidden in
132			* comm_setselect and fd_table[] and calls callbacks for IO ready
133			* events.
134			*/
135			void
136			comm_select(void)
137			{
138			int num, i;
139			static struct kevent ke[KE_LENGTH];
140			struct timespec poll_time;
141	michael	4461	void (hdl)(fde_t , void *);
142	adx	30
143			/*
144			* remember we are doing NANOseconds here, not micro/milli. God knows
145			* why jlemon used a timespec, but hey, he wrote the interface, not I
146			* -- Adrian
147			*/
148			poll_time.tv_sec = 0;
149			poll_time.tv_nsec = SELECT_DELAY * 1000000;
150			num = kevent(kqfd.fd, kq_fdlist, kqoff, ke, KE_LENGTH, &poll_time);
151			kqoff = 0;
152
153			set_time();
154
155			if (num < 0)
156			{
157	michael	6542	const struct timespec req = { .tv_sec = 0, .tv_nsec = 50000000 };
158			nanosleep(&req, NULL); /* Avoid 99% CPU in comm_select */
159	adx	30	return;
160			}
161
162			for (i = 0; i < num; i++)
163			{
164	michael	8341	fde_t *F = &fd_table[ke[i].ident];
165	michael	8339
166			if (F->flags.open == 0 \|\| (ke[i].flags & EV_ERROR))
167	adx	30	continue;
168
169			if (ke[i].filter == EVFILT_READ)
170	michael	2650	{
171	adx	30	if ((hdl = F->read_handler) != NULL)
172			{
173			F->read_handler = NULL;
174			hdl(F, F->read_data);
175	michael	8339
176			if (F->flags.open == 0)
177	michael	2614	continue;
178	adx	30	}
179	michael	2650	}
180	adx	30
181			if (ke[i].filter == EVFILT_WRITE)
182	michael	2650	{
183	adx	30	if ((hdl = F->write_handler) != NULL)
184			{
185			F->write_handler = NULL;
186			hdl(F, F->write_data);
187	michael	8339
188			if (F->flags.open == 0)
189	michael	2614	continue;
190	adx	30	}
191	michael	2650	}
192	adx	30
193			comm_setselect(F, 0, NULL, NULL, 0);
194			}
195			}
196	stu	908	#endif