ring_buffer_poll

函数名称：g_buffer_poll_wait - poll on buffer input*@buffer: buffer to wait on*@cpu: the cpu buffer to wait on*@filp: the file descriptor*@poll_table: The poll descriptor* If @cpu == RING_BUFFER_ALL_CPUS then the task will wake up as soon

函数原型：__poll_t ring_buffer_poll_wait(struct ring_buffer *buffer, int cpu, struct file *filp, poll_table *poll_table)

返回类型：__poll_t

参数：

类型	参数	名称
struct ring_buffer *	buffer
int	cpu
struct file *	filp
poll_table *	poll_table

693

如果cpu恒等于RING_BUFFER_ALL_CPUS则work等于irq_work

695

否则

696

如果非测试CPU信息则返回:负EINVAL

699

cpu_buffer等于buffers[cpu]

700

work等于irq_work

703

poll_wait(filp, & waiters, poll_table)

704

waiters_pending = true

718

smp_mb()

720

如果cpu恒等于RING_BUFFER_ALL_CPUS且非d_buffer_empty - is the ring buffer empty?*@buffer: The ring buffer to test或cpu不等于RING_BUFFER_ALL_CPUS且非g_buffer_empty_cpu - is a cpu buffer of a ring buffer empty?*@buffer: The ring buffer*@cpu: The CPU buffer to test则返回:Epoll event masks 按位或EPOLLRDNORM

723

返回:0

**调用者**
名称	描述
trace_poll

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