aboutsummaryrefslogtreecommitdiffstats
path: root/src/IOThread.cxx
blob: cba9c9263864f7d30f18b88f781003f1e7bb15d2 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
/*
 * Copyright (C) 2003-2013 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * 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.
 */

#include "config.h"
#include "IOThread.hxx"
#include "thread/Mutex.hxx"
#include "thread/Cond.hxx"
#include "event/Loop.hxx"

#include <assert.h>

static struct {
	Mutex mutex;
	Cond cond;

	EventLoop *loop;
	GThread *thread;
} io;

void
io_thread_run(void)
{
	assert(io_thread_inside());
	assert(io.loop != NULL);

	io.loop->Run();
}

static gpointer
io_thread_func(gcc_unused gpointer arg)
{
	/* lock+unlock to synchronize with io_thread_start(), to be
	   sure that io.thread is set */
	io.mutex.lock();
	io.mutex.unlock();

	io_thread_run();
	return NULL;
}

void
io_thread_init(void)
{
	assert(io.loop == NULL);
	assert(io.thread == NULL);

	io.loop = new EventLoop();
}

bool
io_thread_start(gcc_unused GError **error_r)
{
	assert(io.loop != NULL);
	assert(io.thread == NULL);

	const ScopeLock protect(io.mutex);

#if GLIB_CHECK_VERSION(2,32,0)
	io.thread = g_thread_new("io", io_thread_func, nullptr);
#else
	io.thread = g_thread_create(io_thread_func, NULL, true, error_r);
	if (io.thread == NULL)
		return false;
#endif

	return true;
}

void
io_thread_quit(void)
{
	assert(io.loop != NULL);

	io.loop->Break();
}

void
io_thread_deinit(void)
{
	if (io.thread != NULL) {
		io_thread_quit();

		g_thread_join(io.thread);
	}

	delete io.loop;
}

EventLoop &
io_thread_get()
{
	assert(io.loop != nullptr);

	return *io.loop;
}

bool
io_thread_inside(void)
{
	return io.thread != NULL && g_thread_self() == io.thread;
}