You create and initialize a mutex in one operation through the DEFINE_MUTEX macro.
可以通过DEFINE _ mutex宏使用一个操作创建和初始化互斥锁。
Listing 2 demonstrates the macro to perform this operation.
清单2演示执行此操作的宏。
More specifically, it will perform the given operation at macro-expansion time, which is not always the same as compile time in Scheme systems.
更具体地说，它是在宏展开时执行给定的操作，在Scheme系统中宏展开与编译并不总是同时进行的。
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