rwsem_downgrade

函数名称：downgrade a write lock into a read lock* - caller incremented waiting part of count and discovered it still negative* - just wake up any readers at the front of the queue

函数原型：static struct rw_semaphore *rwsem_downgrade_wake(struct rw_semaphore *sem)

返回类型：struct rw_semaphore

参数：

类型	参数	名称
struct rw_semaphore *	sem

1327

raw_spin_lock_irqsave( & wait_lock, flags)

1329

如果非链表为空则handle the lock release when processes blocked on it that can now run* - if we come here from up_xxxx(), then the RWSEM_FLAG_WAITERS bit must* have been set

1332

raw_spin_unlock_irqrestore( & wait_lock, flags)

1333

wake_up_q( & wake_q)

1335

返回:sem

**调用者**
名称	描述
__downgrade_write	downgrade write lock to read lock

源代码转换工具开放的插件接口	X
支持：c/c++/esqlc/java Oracle/Informix/Mysql 插件可实现：逻辑报告代码生成和批量转换代码

函数逻辑报告