函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:include\asm-generic\qspinlock.h Create Date:2022-07-27 09:24:02
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：queued_spin_trylock - try to acquire the queued spinlock*@lock : Pointer to queued spinlock structure* Return: 1 if lock acquired, 0 if failed

函数原型：static __always_inline int queued_spin_trylock(struct qspinlock *lock)

返回类型：int

参数：

类型参数名称
struct qspinlock *lock
60  val等于atomic_read( & val)
62  如果此条件成立可能性小(为编译器优化)(val)则返回:0
65  返回:此条件成立可能性大(为编译器优化)(atomic_try_cmpxchg_acquire( & val, & val, _Q_LOCKED_VAL))
调用者
名称描述
queued_spin_lock_slowpathqueued_spin_lock_slowpath - acquire the queued spinlock*@lock: Pointer to queued spinlock structure*@val: Current value of the queued spinlock 32-bit word* (queue tail, pending bit, lock value)* fast : slow : unlock* : :* uncontended (0,0,0) -:--> (0,0,1)