server/server/evthread.C

/*
 * This file is part of Deliantra, the Roguelike Realtime MMORPG.
 * 
 * Copyright (©) 2007,2008,2009,2010 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;

#define TICK_CYCLES 4

// the tick watcher is activated every TICK_CYCLES
ev_async tick_watcher;
EV_ATOMIC_T coroapi::cede_pending;

// the ticker runs TICK_CYCLES times as fast as the main server tick
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)
{
  static int cycle = 0;

  if (++cycle == TICK_CYCLES)
    {
      cycle = 0;

      SMUTEX_LOCK (evthread_mutex);
      next_tick = w->at + TICK / TICK_CYCLES * (TICK_CYCLES - 1);
      SMUTEX_UNLOCK (evthread_mutex);

      ev_async_send (EV_DEFAULT_UC, &tick_watcher);
    }

  coroapi::cede_pending = 1;
}

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

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

static ev_async async_watcher;
static ev_io aio1_watcher;
static ev_idle aio2_watcher;
static EV_ATOMIC_T aio_pending;

static void
aio2_cb (EV_P_ ev_idle *w, int revents)
{
  IV reqs;

  CALL_BEGIN (0);
  CALL_CALL ("IO::AIO::poll_cb", G_SCALAR);

  reqs = POPi;
  if (count > 0 && reqs < 0)
    ev_idle_start (EV_A, w);
  else
    ev_idle_stop (EV_A, w);

  CALL_END;
}

static void
async_cb (EV_P_ ev_async *w, int revents)
{
  aio2_cb (EV_A, &aio2_watcher, 0);
}

static void
aio1_cb (EV_P_ ev_io *w, int revents)
{
  char dummy[9];

  if (read (w->fd, dummy, sizeof (dummy)) > 0)
    {
      ev_async_send (EV_DEFAULT_UC, &async_watcher);
      coroapi::cede_pending = 1;
    }
}

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

static void *
evthread_proc (void *arg)
{
  ev_loop (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);

  ev_idle_init (&aio2_watcher, aio2_cb);

  // secondary loop
  loop = ev_loop_new (0);

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

  ev_io_init (&aio1_watcher, aio1_cb, aiofd, EV_READ);
  ev_io_start (loop, &aio1_watcher);

  evthread.start (evthread_proc);
}


Revision:	1.11
Committed:	Fri Mar 26 01:04:45 2010 UTC (14 years, 2 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.10:	+1 -1 lines
Log Message:	update copyright for up to 2010
#	User	Rev	Content
1	root	1.1	/*
2			* This file is part of Deliantra, the Roguelike Realtime MMORPG.
3			*
4	root	1.11	* Copyright (©) 2007,2008,2009,2010 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
5	root	1.1	*
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	1.1	*
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	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	1.1	*
20			* 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	1.2	#define TICK_CYCLES 4
31	root	1.1
32	root	1.4	// the tick watcher is activated every TICK_CYCLES
33			ev_async tick_watcher;
34			EV_ATOMIC_T coroapi::cede_pending;
35
36	root	1.1	// the ticker runs TICK_CYCLES times as fast as the main server tick
37			static ev_periodic cede_watcher;
38
39	root	1.4	/////////////////////////////////////////////////////////////////////////////
40	root	1.1
41			// it is a bit silly to have to use a mutex, but contention
42			// is basically non-existant, favouring good mutex implementations.
43			static SMUTEX (evthread_mutex);
44			static NV next_tick;
45
46			NV get_next_tick ()
47			{
48			SMUTEX_LOCK (evthread_mutex);
49			NV retval = next_tick;
50			SMUTEX_UNLOCK (evthread_mutex);
51			return retval;
52			}
53
54			static void
55			cede_cb (EV_P_ ev_periodic *w, int revents)
56			{
57			static int cycle = 0;
58
59			if (++cycle == TICK_CYCLES)
60			{
61			cycle = 0;
62
63			SMUTEX_LOCK (evthread_mutex);
64			next_tick = w->at + TICK / TICK_CYCLES * (TICK_CYCLES - 1);
65			SMUTEX_UNLOCK (evthread_mutex);
66
67	root	1.4	ev_async_send (EV_DEFAULT_UC, &tick_watcher);
68	root	1.1	}
69
70			coroapi::cede_pending = 1;
71			}
72
73			static void
74			tick_cb (EV_P_ ev_async *w, int revents)
75			{
76			cfperl_tick ();
77			}
78
79	root	1.4	/////////////////////////////////////////////////////////////////////////////
80
81			static ev_async async_watcher;
82			static ev_io aio1_watcher;
83			static ev_idle aio2_watcher;
84			static EV_ATOMIC_T aio_pending;
85
86			static void
87			aio2_cb (EV_P_ ev_idle *w, int revents)
88			{
89	root	1.7	IV reqs;
90
91	root	1.4	CALL_BEGIN (0);
92			CALL_CALL ("IO::AIO::poll_cb", G_SCALAR);
93
94	root	1.7	reqs = POPi;
95			if (count > 0 && reqs < 0)
96	root	1.4	ev_idle_start (EV_A, w);
97			else
98			ev_idle_stop (EV_A, w);
99
100			CALL_END;
101			}
102
103			static void
104			async_cb (EV_P_ ev_async *w, int revents)
105			{
106			aio2_cb (EV_A, &aio2_watcher, 0);
107			}
108
109			static void
110			aio1_cb (EV_P_ ev_io *w, int revents)
111			{
112	root	1.8	char dummy[9];
113	root	1.4
114	root	1.8	if (read (w->fd, dummy, sizeof (dummy)) > 0)
115	root	1.4	{
116			ev_async_send (EV_DEFAULT_UC, &async_watcher);
117			coroapi::cede_pending = 1;
118			}
119			}
120
121			/////////////////////////////////////////////////////////////////////////////
122
123	root	1.1	static void *
124			evthread_proc (void *arg)
125			{
126			ev_loop (loop, 0);
127
128			return 0;
129			}
130
131	root	1.4	void evthread_start (int aiofd)
132	root	1.1	{
133			I_EV_API ("evthread");
134	root	1.3
135	root	1.4	// main loop
136	root	1.3	ev_async_init (&tick_watcher, tick_cb);
137			ev_set_priority (&tick_watcher, 1);
138	root	1.4	ev_async_start (EV_DEFAULT_UC, &tick_watcher);
139
140			ev_async_init (&async_watcher, async_cb);
141			ev_set_priority (&async_watcher, 1);
142			ev_async_start (EV_DEFAULT_UC, &async_watcher);
143
144			ev_idle_init (&aio2_watcher, aio2_cb);
145
146			// secondary loop
147			loop = ev_loop_new (0);
148
149			ev_periodic_init (&cede_watcher, cede_cb, 0, TICK / TICK_CYCLES, 0);
150			ev_periodic_start (loop, &cede_watcher);
151
152			ev_io_init (&aio1_watcher, aio1_cb, aiofd, EV_READ);
153			ev_io_start (loop, &aio1_watcher);
154	root	1.3
155	root	1.1	evthread.start (evthread_proc);
156			}
157
158
159