... system-level functions，系统级函数 system V semaphore，系统V信号量 system V shared memory，系统V共享存储器 ...
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Notice that in System V semaphores, key is used to uniquely identify the semaphore; in Windows, the semaphore is identified by a name.
注意，在System v信号量中，key被用来惟一标识信号量；在Windows中，信号量是使用一个名称来标识的。
This is the code used to create the System V semaphore: int semget (key_t key, int nsems, int semflg). Following are the attributes to this code.
用来创建System v信号量使用的代码是：int semget (key_t key, int nsems, int semflg)。
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