函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:include\asm-generic\qrwlock.h Create Date:2022-07-27 10:53:36
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：queued_read_trylock - try to acquire read lock of a queue rwlock*@lock : Pointer to queue rwlock structure* Return: 1 if lock acquired, 0 if failed

函数原型：static inline int queued_read_trylock(struct qrwlock *lock)

返回类型：int

参数：

类型参数名称
struct qrwlock *lock
42  cnts等于atomic_read( & cnts)
43  如果此条件成立可能性大(为编译器优化)(!(cnts & Writer mask ))则
44  cnts等于atomic_add_return_acquire(_QR_BIAS, & cnts)
45  如果此条件成立可能性大(为编译器优化)(!(cnts & Writer mask ))则返回:1
47  atomic_sub(_QR_BIAS, & cnts)
49  返回:0