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 
8 DECLARE_WAIT_QUEUE_HEAD(speakup_event);
9 EXPORT_SYMBOL_GPL(speakup_event);
10 
speakup_thread(void * data)11 int 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 = spk_unprocessed_sound;
27 			spk_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 }
59