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.
如果某个线程执行了阻塞型的操作，操作系统将剥夺其未使用的剩余时间片并让其它线程开始执行。
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.
理想的情况是，线程数量等于处理器的数量，不过这也要求任何线程都不应该执行诸如同步读写、等待事件通知等阻塞型的操作，以免线程阻塞。
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.
对互斥对象解锁会立即发生，但等待条件 mycond 通常是一个阻塞操作，这意味着线程将睡眠，在它苏醒之前不会消耗 CPU 周期。

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