This provides a second option within malloc for satisfying a memory request.
这在malloc中为满足一个内存请求提供了第二种选择。
When users need a block of memory, they make a request for a given size.
当用户需要一块内存时，就请求给自己分配一定大小的内存。
What happen when a process request more memory than available?
会发生什么，当一个进程请求更多的内存比可用的？
The operating system or run-time library cannot fill a request for memory.
作业系统或执行阶段程式库无法满足记忆体要求。
The operating system or run-time library cannot fill a request for memory.
作业系统或执行阶段程式库无法满足记忆体要求。
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