| 1 | |
| 2 | #include <linux/kthread.h>
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| 3 | #include <linux/wait.h>
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| 4 |
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| 5 | #include "spk_types.h"
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| 6 | #include "speakup.h"
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| 7 | #include "spk_priv.h"
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| 8 |
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| 9 | DECLARE_WAIT_QUEUE_HEAD(speakup_event);
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| 10 | EXPORT_SYMBOL_GPL(speakup_event);
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| 11 |
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| 12 | int speakup_thread(void *data)
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| 13 | {
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| 14 | unsigned long flags;
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| 15 | int should_break;
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| 16 | struct bleep our_sound;
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| 17 |
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| 18 | our_sound.active = 0;
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| 19 | our_sound.freq = 0;
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| 20 | our_sound.jiffies = 0;
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| 21 |
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| 22 | mutex_lock(&spk_mutex);
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| 23 | while (1) {
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| 24 | DEFINE_WAIT(wait);
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| 25 |
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| 26 | while (1) {
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| 27 | spin_lock_irqsave(&speakup_info.spinlock, flags);
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| 28 | our_sound = spk_unprocessed_sound;
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| 29 | spk_unprocessed_sound.active = 0;
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| 30 | prepare_to_wait(&speakup_event, &wait,
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| 31 | TASK_INTERRUPTIBLE);
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| 32 | should_break = kthread_should_stop() ||
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| 33 | our_sound.active ||
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| 34 | (synth && synth->catch_up && synth->alive &&
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| 35 | (speakup_info.flushing ||
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| 36 | !synth_buffer_empty()));
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| 37 | spin_unlock_irqrestore(&speakup_info.spinlock, flags);
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| 38 | if (should_break)
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| 39 | break;
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| 40 | mutex_unlock(&spk_mutex);
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| 41 | schedule();
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| 42 | mutex_lock(&spk_mutex);
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| 43 | }
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| 44 | finish_wait(&speakup_event, &wait);
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| 45 | if (kthread_should_stop())
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| 46 | break;
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| 47 |
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| 48 | if (our_sound.active)
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| 49 | kd_mksound(our_sound.freq, our_sound.jiffies);
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| 50 | if (synth && synth->catch_up && synth->alive) {
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| 51 | |
| 52 | * It is up to the callee to take the lock, so that it
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| 53 | * can sleep whenever it likes
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| 54 |
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| 55 | synth->catch_up(synth);
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| 56 | }
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| 57 |
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| 58 | speakup_start_ttys();
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| 59 | }
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| 60 | mutex_unlock(&spk_mutex);
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| 61 | return 0;
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| 62 | }
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