What are the things to take care when waiting for a blocked I/O operation ?

允许进一步等待I/O 完成的情况下，该注意那些事?。

youdao

So, if a thread is blocked in an I/O operation on a channel, another thread can close that channel.

所以，如果一个线程在某条通道的 I/O 操作上阻塞时，那么另一个线程可以将这条通道关闭。

youdao

res is the usual result of an I/O operation: the number of bytes transfered, or a negative error code.

res是IO操作的通常结果：传输的字节数，或者负值的错误码。

youdao

The operation is moving into its final days at LSU, O'Keefe said.

CNN: Classes resume at LSU after Katrina

Meanwhile, O.tel.o's cable TV business (second, after Deutsche Telekom's CATV operation) is cash-flow positive.

FORBES: Ulrich Hartmann's second act

According to a study carried out by Dr Landau, in co-operation with Marc Parmentier at the Free University of Brussels, and Stephen O'Brien at the National Cancer Institute in Frederick, Maryland, roughly one in every ten Caucasians carries it, although it is strangely absent in African and Asian populations.

ECONOMIST: Living with AIDS