内存锁定是一种保证某进程驻留在内存而不需换页的方法。
Memory locking is a way to ensure that a process stays in main memory and is exempt from paging.
并利用多线程及内存锁定分配方式保证打印程序连续流畅的运行，使得最终得到合格的打印图像。
The printing program works smoothly and continuously by using multithreading technology and memory lock allocation and therefore we get satisfied printing images.
操作系统会强行为 能够被锁定的内存的大小设定一个上限。
The operating system imposes a limit on the amount of memory that can be locked.
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