Linux Kernel  3.7.1
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thread.c
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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 
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 
22  while (1) {
24  while (1) {
25  spk_lock(flags);
26  our_sound = unprocessed_sound;
27  unprocessed_sound.active = 0;
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;
39  schedule();
41  }
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 
55  }
57  return 0;
58 }