trunk/src/s_bsd_poll.c

/*
 *  ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
 *
 *  Copyright (c) 2000-2015 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_poll.c
 * \brief POSIX poll() compatible network routines.
 * \version $Id$
 */

#include "stdinc.h"
#if USE_IOPOLL_MECHANISM == __IOPOLL_MECHANISM_POLL
#include <sys/poll.h>
#include "fdlist.h"
#include "list.h"
#include "memory.h"
#include "ircd.h"
#include "s_bsd.h"
#include "log.h"

/* I hate linux -- adrian */
#ifndef POLLRDNORM
#define POLLRDNORM POLLIN
#endif
#ifndef POLLWRNORM
#define POLLWRNORM POLLOUT
#endif

static int pollfds_size;
static struct pollfd *pollfds;
static int pollnum;


/*
 * init_netio
 *
 * This is a needed exported function which will be called to initialise
 * the network loop code.
 */
void
init_netio(void)
{
  pollfds_size = hard_fdlimit;
  pollfds = MyCalloc(sizeof(struct pollfd) * pollfds_size);
}

/*
 * 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;

  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 ? POLLRDNORM : 0) |
               (F->write_handler ? POLLWRNORM : 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)
    {
      if (F->comm_index != pollnum - 1)
      {
        fde_t *other = lookup_fd(pollfds[pollnum - 1].fd);

        pollfds[F->comm_index].fd = pollfds[pollnum - 1].fd;
        pollfds[F->comm_index].events = pollfds[pollnum - 1].events;
        pollfds[F->comm_index].revents = pollfds[pollnum - 1].revents;

        assert(other);
        other->comm_index = F->comm_index;
      }

      F->comm_index = -1;
      --pollnum;
    }
    else
    {
      if (F->evcache == 0)
      {
        if (pollnum >= pollfds_size)
        {
          pollfds_size *= 2;
          pollfds = MyRealloc(pollfds, sizeof(struct pollfd) * pollfds_size);
        }

        F->comm_index = pollnum++;
        pollfds[F->comm_index].fd = F->fd;
      }

      pollfds[F->comm_index].events = new_events;
      pollfds[F->comm_index].revents = 0;
    }

    F->evcache = new_events;
  }
}

/*
 * 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)
{
  int num, ci;
  void (*hdl)(fde_t *, void *);
  fde_t *F;

  num = poll(pollfds, pollnum, 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 (ci = 0; ci < pollnum && num > 0; ci++)
  {
    int revents = pollfds[ci].revents;

    if (revents == 0)
      continue;
    num--;

    F = lookup_fd(pollfds[ci].fd);
    assert(F);
    if (!F->flags.open)
      continue;

    if (revents & (POLLRDNORM | POLLIN | POLLHUP | POLLERR))
    {
      if ((hdl = F->read_handler))
      {
        F->read_handler = NULL;
        hdl(F, F->read_data);
        if (!F->flags.open)
          continue;
      }
    }

    if (revents & (POLLWRNORM | POLLOUT | POLLHUP | POLLERR))
    {
      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:	4672 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) 2000-2015 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_poll.c
23			* \brief POSIX poll() compatible network routines.
24			* \version $Id$
25			*/
26
27	adx	30	#include "stdinc.h"
28	stu	908	#if USE_IOPOLL_MECHANISM == __IOPOLL_MECHANISM_POLL
29	adx	30	#include <sys/poll.h>
30			#include "fdlist.h"
31	michael	1021	#include "list.h"
32	michael	2627	#include "memory.h"
33	adx	30	#include "ircd.h"
34			#include "s_bsd.h"
35	michael	1309	#include "log.h"
36	adx	30
37			/* I hate linux -- adrian */
38			#ifndef POLLRDNORM
39			#define POLLRDNORM POLLIN
40			#endif
41			#ifndef POLLWRNORM
42			#define POLLWRNORM POLLOUT
43			#endif
44
45	michael	4472	static int pollfds_size;
46	adx	30	static struct pollfd *pollfds;
47	michael	4472	static int pollnum;
48	adx	30
49
50			/*
51			* init_netio
52			*
53			* This is a needed exported function which will be called to initialise
54			* the network loop code.
55			*/
56			void
57			init_netio(void)
58			{
59	michael	4472	pollfds_size = hard_fdlimit;
60			pollfds = MyCalloc(sizeof(struct pollfd) * pollfds_size);
61	adx	30	}
62
63			/*
64			* comm_setselect
65			*
66			* This is a needed exported function which will be called to register
67			* and deregister interest in a pending IO state for a given FD.
68			*/
69			void
70	michael	4461	comm_setselect(fde_t F, unsigned int type, void (handler)(fde_t , void ),
71	adx	30	void *client_data, time_t timeout)
72	michael	2916	{
73	adx	30	int new_events;
74
75			if ((type & COMM_SELECT_READ))
76			{
77			F->read_handler = handler;
78			F->read_data = client_data;
79			}
80
81			if ((type & COMM_SELECT_WRITE))
82			{
83			F->write_handler = handler;
84			F->write_data = client_data;
85			}
86
87			new_events = (F->read_handler ? POLLRDNORM : 0) \|
88	michael	2650	(F->write_handler ? POLLWRNORM : 0);
89	adx	30
90			if (timeout != 0)
91	michael	2725	{
92	adx	30	F->timeout = CurrentTime + (timeout / 1000);
93	michael	2725	F->timeout_handler = handler;
94			F->timeout_data = client_data;
95			}
96	adx	30
97			if (new_events != F->evcache)
98			{
99			if (new_events == 0)
100			{
101	michael	4472	if (F->comm_index != pollnum - 1)
102			{
103			fde_t *other = lookup_fd(pollfds[pollnum - 1].fd);
104	adx	30
105	michael	4472	pollfds[F->comm_index].fd = pollfds[pollnum - 1].fd;
106			pollfds[F->comm_index].events = pollfds[pollnum - 1].events;
107			pollfds[F->comm_index].revents = pollfds[pollnum - 1].revents;
108
109			assert(other);
110			other->comm_index = F->comm_index;
111			}
112
113			F->comm_index = -1;
114			--pollnum;
115	adx	30	}
116			else
117			{
118			if (F->evcache == 0)
119			{
120	michael	4472	if (pollnum >= pollfds_size)
121			{
122			pollfds_size *= 2;
123			pollfds = MyRealloc(pollfds, sizeof(struct pollfd) * pollfds_size);
124			}
125	adx	30
126	michael	4472	F->comm_index = pollnum++;
127	michael	2650	pollfds[F->comm_index].fd = F->fd;
128	adx	30	}
129	michael	2650
130	adx	30	pollfds[F->comm_index].events = new_events;
131			pollfds[F->comm_index].revents = 0;
132			}
133
134			F->evcache = new_events;
135			}
136			}
137	michael	2916
138	adx	30	/*
139			* comm_select
140			*
141			* Called to do the new-style IO, courtesy of of squid (like most of this
142			* new IO code). This routine handles the stuff we've hidden in
143			* comm_setselect and fd_table[] and calls callbacks for IO ready
144			* events.
145			*/
146			void
147			comm_select(void)
148			{
149	michael	4472	int num, ci;
150	michael	4461	void (hdl)(fde_t , void *);
151	adx	30	fde_t *F;
152
153	michael	4472	num = poll(pollfds, pollnum, SELECT_DELAY);
154	adx	30
155			set_time();
156
157			if (num < 0)
158			{
159	michael	6542	const struct timespec req = { .tv_sec = 0, .tv_nsec = 50000000 };
160			nanosleep(&req, NULL); /* Avoid 99% CPU in comm_select */
161	adx	30	return;
162			}
163
164	michael	4472	for (ci = 0; ci < pollnum && num > 0; ci++)
165	adx	30	{
166	michael	4472	int revents = pollfds[ci].revents;
167
168			if (revents == 0)
169	adx	30	continue;
170			num--;
171
172			F = lookup_fd(pollfds[ci].fd);
173	michael	4472	assert(F);
174			if (!F->flags.open)
175	adx	30	continue;
176
177			if (revents & (POLLRDNORM \| POLLIN \| POLLHUP \| POLLERR))
178	michael	2650	{
179	michael	5902	if ((hdl = F->read_handler))
180	adx	30	{
181			F->read_handler = NULL;
182			hdl(F, F->read_data);
183	michael	2650	if (!F->flags.open)
184			continue;
185	adx	30	}
186	michael	2650	}
187	adx	30
188			if (revents & (POLLWRNORM \| POLLOUT \| POLLHUP \| POLLERR))
189	michael	2650	{
190	michael	5902	if ((hdl = F->write_handler))
191	adx	30	{
192			F->write_handler = NULL;
193			hdl(F, F->write_data);
194	michael	2650	if (!F->flags.open)
195			continue;
196	adx	30	}
197	michael	2650	}
198	adx	30
199			comm_setselect(F, 0, NULL, NULL, 0);
200			}
201			}
202	stu	908	#endif