__down_common

函数名称：Because this function is inlined, the 'state' parameter will be* constant, and thus optimised away by the compiler. Likewise the* 'timeout' parameter for the cases without timeouts.

函数原型：static inline int __sched __down_common(struct semaphore *sem, long state, long timeout)

返回类型：int

参数：

类型	参数	名称
struct semaphore *	sem
long	state
long	timeout

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添加链表项

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task等于当前进程

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up = false

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循环

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如果signal_pending_state(state, 当前进程)则转到:interrupted

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如果此条件成立可能性小(为编译器优化)(timeout <= 0)则转到:timed_out

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set_current_state() includes a barrier so that the write of current->state* is correctly serialised wrt the caller's subsequent test of whether to* actually sleep:* for (;;) {* set_current_state(TASK_UNINTERRUPTIBLE);* if (!need_sleep)* break;* (state)

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raw_spin_unlock_irq( & lock)

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timeout等于schedule_timeout - sleep until timeout*@timeout: timeout value in jiffies* Make the current task sleep until @timeout jiffies have* elapsed

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关闭本地中断，获取所要保护的运行队列（runqueue）的自旋锁（spinlock），为查找可运行进程做准备。( & lock)

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如果up则返回:0

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timed_out :

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删除链表项

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返回:负ETIME

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interrupted :

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删除链表项

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返回:负EINTR

**调用者**
名称	描述
__down
__down_interruptible
__down_killable
__down_timeout

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