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#include <stdio.h>    #include <stdlib.h>    #include <errno.h>    #include <sys/types.h>    #include <sys/ipc.h>    #include <sys/sem.h>    int main(void)    {        key_t key;        int semid;static struct sembuf DecrR = {0,-1,SEM_UNDO};static struct sembuf IncrR = {0,1,SEM_UNDO};static struct sembuf DecrW = {1,-1,SEM_UNDO};static struct sembuf IncrW = {1,1,SEM_UNDO};static struct sembuf DecrCl = {2,-1,SEM_UNDO};static struct sembuf IncrCl = {2,1,SEM_UNDO};static struct sembuf DecrC = {3,-1,SEM_UNDO};static struct sembuf IncrC = {3,1,SEM_UNDO};	key = ftok("reader.c", 'X');	semid= semget(key,4,IPC_CREAT | 0600);//	semctl(semid,0,SETVAL,1);//	semctl(semid,1,SETVAL,1);//	semctl(semid,2,SETVAL,1);//	semctl(semid,3,SETVAL,1);int i;int j;for(i = 0; i<5; i++){semop(semid,&IncrR,1);semctl(semid,2,SETVAL,0);j=semctl(semid, 3, GETVAL, 0);if(j==0){semctl(semid,1,SETVAL,0);semop(semid, &IncrC, 1);}semctl(semid,2,SETVAL,1);semop(semid, &DecrR, 1);printf("READING\n");sleep(2);printf("DONE READING\n");printf("test");semctl(semid,2,SETVAL,0);semop(semid, &DecrC, 1);j=semctl(semid, 3, GETVAL, 0);if(j==0){semctl(semid,1,SETVAL,1);semop(semid, &DecrCl, 1);}sleep(4);}        return 0;    }