Linux系统环境进程间通信：信号灯（5）5

t sem_queue ** prev; /* previous entry in the queue, *(q->prev) == q */ struct task_struct* sleeper; /* this process */ struct sem_undo * undo; /* undo structure */ int pid; /* process id of requesting process */ int status; /* completion status of operation */ struct sem_array * sma; /* semaphore array for operations */ int id; /* internal sem id */ struct sembuf * sops; /* array of pending operations */ int nsops; /* number of operations */ int alter; /* operation will alter semaphore */ };

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