pipe_empty

函数名称：pipe_empty - Return true if the pipe is empty*@head: The pipe ring head pointer*@tail: The pipe ring tail pointer

函数原型：static inline bool pipe_empty(unsigned int head, unsigned int tail)

返回类型：bool

参数：

类型	参数	名称
unsigned int	head
unsigned int	tail

116

返回:head恒等于tail

**调用者**
名称	描述
pipe_truncate
pipe_readable	Done while waiting without holding the pipe lock - thus the READ_ONCE()
pipe_read
pipe_write
pipe_poll	No kernel lock held - fine
splice_from_pipe_feed	splice_from_pipe_feed - feed available data from a pipe to a file@pipe: pipe to splice from@sd: information to @actor@actor: handler that splices the data Description:* This function loops over the pipe and calls @actor to do the* actual moving of a
splice_from_pipe_next	splice_from_pipe_next - wait for some data to splice from@pipe: pipe to splice from@sd: information about the splice operation* Description:* This function will wait for some data and return a positive* value (one) if pipe buffers are available
iter_file_splice_write	r_file_splice_write - splice data from a pipe to a file@pipe: pipe info@out: file to write to@ppos: position in @out@len: number of bytes to splice@flags: splice modifier flags Description:* Will either move or copy pages (determined by @flags
splice_direct_to_actor	splice_direct_to_actor - splices data directly between two non-pipes@in: file to splice from@sd: actor information on where to splice to@actor: handles the data splicing Description:* This is a special case helper to splice directly between two
ipipe_prep	Make sure there's data to read. Wait for input if we can, otherwise* return an appropriate error.
splice_pipe_to_pipe
link_pipe	Link contents of ipipe to opipe.

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