函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\relay.c Create Date:2022-07-27 12:52:15
Last Modify:2020-03-17 19:20:22 Copyright©Brick
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函数名称：lay_file_read_subbuf_avail - return bytes available in sub-buffer*@read_pos: file read position*@buf: relay channel buffer

函数原型：static size_t relay_file_read_subbuf_avail(size_t read_pos, struct rchan_buf *buf)

返回类型：size_t

参数：

类型参数名称
size_tread_pos
struct rchan_buf *buf
1041  avail等于0
1043  subbuf_size等于 sub-buffer size
1045  write_subbuf等于start of current sub-buffer 减start of channel buffer 的差除subbuf_size
1046  write_offset等于如果current offset into sub-buffer 大于subbuf_size则subbuf_size否则current offset into sub-buffer
1047  read_subbuf等于read_pos除subbuf_size
1048  read_offset等于read_pos取模subbuf_size
1049  padding等于padding counts per sub-buffer [read_subbuf]
1051  如果read_subbuf恒等于write_subbuf则
1052  如果read_offset加padding小于write_offset则avail等于write_offset减read_offset加padding
1054  否则avail等于subbuf_size减padding减read_offset
1057  返回:avail
调用者
名称描述
relay_file_read