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)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 = 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