https://elixir.bootlin.com/linux/v5.19/source/fs/pipe.c#L247
当一个管道满了的时候,它不应该唤醒读者读出数据吗?
/*
* We only wake up writers if the pipe was full when we started
* reading in order to avoid unnecessary wakeups.
*
* But when we do wake up writers, we do so using a sync wakeup
* (W
我刚刚观察到,在二元结构中,失速现象非常罕见。
将gdb附加到相关线程并切换到相应线程
(gdb) bt
#0 0x000000330a4db79d in write () from /lib64/libc.so.6
#1 0x000000330a471dd3 in _IO_new_file_write () from /lib64/libc.so.6
#2 0x000000330a473385 in _IO_new_do_write () from /lib64/libc.so.6
#3 0x000000330a4726df in _IO_new_file_overflow () f
我正在学习使用Linux终端,它似乎不像我所期望的那样起作用,我想了解原因。
我有两份文件:
File1
John 1
Paul 2
Peter 3
Henry 5
File2
John 2
Peter 7
Francis 5
我的想法是订购File2,然后使用以下命令将有序的结果与File1连接起来:
sort -k2n File2 | join -1 2 -2 2 File1 File2
我料到结果是
2 John Paul
5 Francis Henry
但是,它似乎并没有在管道和返回之前订购:
2 John Paul
join: File2:3: is not