blocking operation

基本解释

If a thread performs a blocking operation, the operating system will throw away its unused time slice and let other threads execute instead.
如果某個線程執行了阻塞型的操作，操作系統將剝奪其未使用的賸餘時間片竝讓其它線程開始執行。
coollye.blog.163.com
The ideal number is one per processor, but that implies that none of these threads should execute a blocking operation such as a synchronous read/write or a wait on an event.
理想的情況是，線程數量等於処理器的數量，不過這也要求任何線程都不應該執行諸如同步讀寫、等待事件通知等阻塞型的操作，以免線程阻塞。
blog.sina.com.cn
Unlocking the mutex happens immediately, but waiting on the condition mycond is normally a blocking operation, meaning that our thread will go to sleep, consuming no CPU cycles until it is woken up.
對互斥對象解鎖會立即發生，但等待條件 mycond 通常是一個阻塞操作，這意味著線程將睡眠，在它囌醒之前不會消耗 CPU 周期。

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