63 lines
1.4 KiB
C
63 lines
1.4 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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#include <linux/kthread.h>
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#include <linux/wait.h>
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#include "spk_types.h"
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#include "speakup.h"
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#include "spk_priv.h"
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DECLARE_WAIT_QUEUE_HEAD(speakup_event);
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EXPORT_SYMBOL_GPL(speakup_event);
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int speakup_thread(void *data)
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{
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unsigned long flags;
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int should_break;
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struct bleep our_sound;
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our_sound.active = 0;
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our_sound.freq = 0;
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our_sound.jiffies = 0;
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mutex_lock(&spk_mutex);
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while (1) {
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DEFINE_WAIT(wait);
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while (1) {
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spin_lock_irqsave(&speakup_info.spinlock, flags);
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our_sound = spk_unprocessed_sound;
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spk_unprocessed_sound.active = 0;
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prepare_to_wait(&speakup_event, &wait,
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TASK_INTERRUPTIBLE);
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should_break = kthread_should_stop() ||
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our_sound.active ||
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(synth && synth->catch_up && synth->alive &&
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(speakup_info.flushing ||
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!synth_buffer_empty()));
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spin_unlock_irqrestore(&speakup_info.spinlock, flags);
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if (should_break)
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break;
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mutex_unlock(&spk_mutex);
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schedule();
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mutex_lock(&spk_mutex);
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}
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finish_wait(&speakup_event, &wait);
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if (kthread_should_stop())
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break;
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if (our_sound.active)
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kd_mksound(our_sound.freq, our_sound.jiffies);
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if (synth && synth->catch_up && synth->alive) {
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/*
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* It is up to the callee to take the lock, so that it
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* can sleep whenever it likes
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*/
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synth->catch_up(synth);
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}
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speakup_start_ttys();
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}
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mutex_unlock(&spk_mutex);
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return 0;
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}
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