linux提取锁和信号灯经常使用

1.信号( 这两个过程之间的同步)

struct semaphore power_sem;

sema_init(&pdata->power_sem,1);

down(&pdata->power_sem);

up(&pdata->power_sem);

2.相互排斥量

struct mutex led_mutex;

mutex_init(&led_mutex);

mutex_lock(&led_mutex);

while(t--);// for delay

mutex_unlock(&led_mutex);

mutex_destroy(&led_mutex);

3.wakup锁：

static struct wake_lock ec43_wlock;

wake_lock_init(&ec43_wlock, WAKE_LOCK_SUSPEND, "ec43_wakelock");

wake_lock_timeout(&ec43_wlock, msecs_to_jiffies(10*1000));

//等于上面 wake_lock_timeout(&ec43_wlock, 10*HZ);

wake_lock_destroy(&ec43_wlock);

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