server/server/evthread.C

/*
 * This file is part of Deliantra, the Roguelike Realtime MMORPG.
 *
 * Copyright (©) 2007,2008,2009,2010,2011,2012,2013,2014,2015,2016 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
 *
 * Deliantra is free software: you can redistribute it and/or modify it under
 * the terms of the Affero GNU General Public License as published by the
 * Free Software Foundation, either version 3 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 Affero GNU General Public License
 * and the GNU General Public License along with this program. If not, see
 * <http://www.gnu.org/licenses/>.
 *
 * The authors can be reached via e-mail to <support@deliantra.net>
 */

#include "global.h"
#include "evthread.h"
#include "cfperl.h"

thread evthread;
static ev_loop *loop;

/////////////////////////////////////////////////////////////////////////////

ev_async tick_watcher;
EV_ATOMIC_T coroapi::cede_pending;

static ev_periodic cede_watcher;

// it is a bit silly to have to use a mutex, but contention
// is basically non-existant, favouring good mutex implementations.
static SMUTEX (evthread_mutex);
static NV next_tick;

NV get_next_tick ()
{
  SMUTEX_LOCK (evthread_mutex);
  NV retval = next_tick;
  SMUTEX_UNLOCK (evthread_mutex);
  return retval;
}

static void
cede_cb (EV_P_ ev_periodic *w, int revents)
{
  SMUTEX_LOCK (evthread_mutex);
  next_tick = w->at;
  SMUTEX_UNLOCK (evthread_mutex);

  coroapi::cede_pending = 1;

  ev_async_send (EV_DEFAULT_UC, &tick_watcher);
}

static void
tick_cb (EV_P_ ev_async *w, int revents)
{
  cfperl_tick ();
}

/////////////////////////////////////////////////////////////////////////////

static SMUTEX(cb_mutex);
static SCOND(cb_done);

static ev_async async_watcher;
static ev_io aio_watcher;

static void
async_cb (EV_P_ ev_async *w, int revents)
{
  CALL_BEGIN (0);
  CALL_CALL ("IO::AIO::poll_cb", G_SCALAR);
  IV reqs = POPi;
  CALL_END;

  SMUTEX_LOCK (cb_mutex);
  SCOND_SIGNAL (cb_done);
  SMUTEX_UNLOCK (cb_mutex);
}

static void
aio_cb (EV_P_ ev_io *w, int revents)
{
  ev_async_send (EV_DEFAULT_UC, &async_watcher);

  coroapi::cede_pending = 1; // to decrease latency

  SCOND_WAIT (cb_done, cb_mutex);
}

/////////////////////////////////////////////////////////////////////////////

static void *
evthread_proc (void *arg)
{
  SMUTEX_LOCK (cb_mutex);

  ev_run (loop, 0);

  return 0;
}

void evthread_start (int aiofd)
{
  I_EV_API ("evthread");

  // main loop
  ev_async_init (&tick_watcher, tick_cb);
  ev_set_priority (&tick_watcher, 1);
  ev_async_start (EV_DEFAULT_UC, &tick_watcher);

  ev_async_init (&async_watcher, async_cb);
  ev_set_priority (&async_watcher, 1);
  ev_async_start (EV_DEFAULT_UC, &async_watcher);

  // secondary loop, we use select/poll as epoll has very
  // bad timing characteristics and we only watch a single low fd.
  loop = ev_loop_new (EVBACKEND_SELECT);

  ev_periodic_init (&cede_watcher, cede_cb, 0, TICK, 0);
  ev_periodic_start (loop, &cede_watcher);

  ev_io_init (&aio_watcher, aio_cb, aiofd, EV_READ);
  ev_io_start (loop, &aio_watcher);

  evthread.start (evthread_proc);
}


Revision:	1.18
Committed:	Wed Nov 16 23:42:02 2016 UTC (7 years, 6 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.17:	+1 -1 lines
Log Message:	copyright update 2016
#	User	Rev	Content
1	root	1.1	/*
2			* This file is part of Deliantra, the Roguelike Realtime MMORPG.
3	root	1.17	*
4	root	1.18	* Copyright (©) 2007,2008,2009,2010,2011,2012,2013,2014,2015,2016 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
5	root	1.17	*
6	root	1.9	* Deliantra is free software: you can redistribute it and/or modify it under
7			* the terms of the Affero GNU General Public License as published by the
8			* Free Software Foundation, either version 3 of the License, or (at your
9			* option) any later version.
10	root	1.17	*
11	root	1.1	* 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	root	1.17	*
16	root	1.9	* You should have received a copy of the Affero GNU General Public License
17			* and the GNU General Public License along with this program. If not, see
18			* <http://www.gnu.org/licenses/>.
19	root	1.17	*
20	root	1.1	* The authors can be reached via e-mail to <support@deliantra.net>
21			*/
22
23			#include "global.h"
24			#include "evthread.h"
25			#include "cfperl.h"
26
27			thread evthread;
28			static ev_loop *loop;
29
30	root	1.12	/////////////////////////////////////////////////////////////////////////////
31	root	1.1
32	root	1.4	ev_async tick_watcher;
33			EV_ATOMIC_T coroapi::cede_pending;
34
35	root	1.1	static ev_periodic cede_watcher;
36
37			// it is a bit silly to have to use a mutex, but contention
38			// is basically non-existant, favouring good mutex implementations.
39			static SMUTEX (evthread_mutex);
40			static NV next_tick;
41
42			NV get_next_tick ()
43			{
44			SMUTEX_LOCK (evthread_mutex);
45			NV retval = next_tick;
46			SMUTEX_UNLOCK (evthread_mutex);
47			return retval;
48			}
49
50			static void
51			cede_cb (EV_P_ ev_periodic *w, int revents)
52			{
53	root	1.12	SMUTEX_LOCK (evthread_mutex);
54			next_tick = w->at;
55			SMUTEX_UNLOCK (evthread_mutex);
56	root	1.1
57	root	1.12	coroapi::cede_pending = 1;
58	root	1.1
59	root	1.12	ev_async_send (EV_DEFAULT_UC, &tick_watcher);
60	root	1.1	}
61
62			static void
63			tick_cb (EV_P_ ev_async *w, int revents)
64			{
65			cfperl_tick ();
66			}
67
68	root	1.4	/////////////////////////////////////////////////////////////////////////////
69
70	root	1.12	static SMUTEX(cb_mutex);
71			static SCOND(cb_done);
72
73	root	1.4	static ev_async async_watcher;
74	root	1.12	static ev_io aio_watcher;
75	root	1.4
76			static void
77	root	1.12	async_cb (EV_P_ ev_async *w, int revents)
78	root	1.4	{
79			CALL_BEGIN (0);
80			CALL_CALL ("IO::AIO::poll_cb", G_SCALAR);
81	root	1.12	IV reqs = POPi;
82			CALL_END;
83	root	1.4
84	root	1.12	SMUTEX_LOCK (cb_mutex);
85			SCOND_SIGNAL (cb_done);
86			SMUTEX_UNLOCK (cb_mutex);
87	root	1.4	}
88
89			static void
90	root	1.12	aio_cb (EV_P_ ev_io *w, int revents)
91	root	1.4	{
92	root	1.12	ev_async_send (EV_DEFAULT_UC, &async_watcher);
93	root	1.4
94	root	1.12	coroapi::cede_pending = 1; // to decrease latency
95	root	1.4
96	root	1.12	SCOND_WAIT (cb_done, cb_mutex);
97	root	1.4	}
98
99			/////////////////////////////////////////////////////////////////////////////
100
101	root	1.1	static void *
102			evthread_proc (void *arg)
103			{
104	root	1.12	SMUTEX_LOCK (cb_mutex);
105
106	root	1.13	ev_run (loop, 0);
107	root	1.1
108			return 0;
109			}
110
111	root	1.4	void evthread_start (int aiofd)
112	root	1.1	{
113			I_EV_API ("evthread");
114	root	1.3
115	root	1.4	// main loop
116	root	1.3	ev_async_init (&tick_watcher, tick_cb);
117			ev_set_priority (&tick_watcher, 1);
118	root	1.4	ev_async_start (EV_DEFAULT_UC, &tick_watcher);
119
120			ev_async_init (&async_watcher, async_cb);
121			ev_set_priority (&async_watcher, 1);
122			ev_async_start (EV_DEFAULT_UC, &async_watcher);
123
124	root	1.14	// secondary loop, we use select/poll as epoll has very
125			// bad timing characteristics and we only watch a single low fd.
126			loop = ev_loop_new (EVBACKEND_SELECT);
127	root	1.4
128	root	1.12	ev_periodic_init (&cede_watcher, cede_cb, 0, TICK, 0);
129	root	1.4	ev_periodic_start (loop, &cede_watcher);
130
131	root	1.12	ev_io_init (&aio_watcher, aio_cb, aiofd, EV_READ);
132			ev_io_start (loop, &aio_watcher);
133	root	1.3
134	root	1.1	evthread.start (evthread_proc);
135			}
136
137
138