1#include <linux/kthread.h>
 2#include <linux/wait.h>
 3
 4#include "spk_types.h"
 5#include "speakup.h"
 6#include "spk_priv.h"
 7
 8DECLARE_WAIT_QUEUE_HEAD(speakup_event);
 9EXPORT_SYMBOL_GPL(speakup_event);
10
11int speakup_thread(void *data)
12{
13	unsigned long flags;
14	int should_break;
15	struct bleep our_sound;
16
17	our_sound.active = 0;
18	our_sound.freq = 0;
19	our_sound.jiffies = 0;
20
21	mutex_lock(&spk_mutex);
22	while (1) {
23		DEFINE_WAIT(wait);
24		while (1) {
25			spk_lock(flags);
26			our_sound = unprocessed_sound;
27			unprocessed_sound.active = 0;
28			prepare_to_wait(&speakup_event, &wait,
29				TASK_INTERRUPTIBLE);
30			should_break = kthread_should_stop() ||
31				our_sound.active ||
32				(synth && synth->catch_up && synth->alive &&
33					(speakup_info.flushing ||
34					!synth_buffer_empty()));
35			spk_unlock(flags);
36			if (should_break)
37				break;
38			mutex_unlock(&spk_mutex);
39			schedule();
40			mutex_lock(&spk_mutex);
41		}
42		finish_wait(&speakup_event, &wait);
43		if (kthread_should_stop())
44			break;
45
46		if (our_sound.active)
47			kd_mksound(our_sound.freq, our_sound.jiffies);
48		if (synth && synth->catch_up && synth->alive) {
49			/* It is up to the callee to take the lock, so that it
50			 * can sleep whenever it likes */
51			synth->catch_up(synth);
52		}
53
54		speakup_start_ttys();
55	}
56	mutex_unlock(&spk_mutex);
57	return 0;
58}