东北大学 操作系统实验三报告.doc

操作系统实验报告 班 级物联网1302班学 号姓 名 实验3 进程同步和通信-生产者和消费者问题模拟1. 目的： 调试、修改、运行模拟程序，通过形象化的状态显示，使学生理解进程的概念，了解同步和通信的过程，掌握进程通信和同步的机制，特别是利用缓冲区进行同步和通信的过程。通过补充新功能，使学生能灵活运用相关知识，培养创新能力。2. 内容及要求：1) 调试、运行模拟程序。2) 发现并修改程序中不完善的地方。3) 修改程序，使用随机数控制创建生产者和消费者的过程。4) 在原来程序的基础上，加入缓冲区的写互斥控制功能，模拟多个进程存取一个公共缓冲区，当有进程正在写缓冲区时，其他要访问该缓冲区的进程必须等待，当有进程正在读取缓冲区时，其他要求读取的进程可以访问，而要求写的进程应该等待。5) 完成1)、2)、3）功能的,得基本分,完成4)功能的加2分,有其它功能改进的再加2分3. 程序说明：本程序是模拟两个进程，生产者（producer）和消费者(Consumer)工作。生产者每次产生一个数据，送入缓冲区中。消费者每次从缓冲区中取走一个数据。缓冲区可以容纳8个数据。因为缓冲区是有限的，因此当其满了时生产者进程应该等待，而空时，消费者进程应该等待；当生产者向缓冲区放入了一个数据，应唤醒正在等待的消费者进程，同样，当消费者取走一个数据后，应唤醒正在等待的生产者进程。就是生产者和消费者之间的同步。每次写入和读出数据时，都将读和写指针加一。当读写指针同样时，又一起退回起点。当写指针指向最后时，生产者就等待。当读指针为零时，再次要读取的消费者也应该等待。 为简单起见，每次产生的数据为0-99的整数，从0开始，顺序递增。两个进程的调度是通过运行者使用键盘来实现的。4. 程序使用的数据结构进程控制块：包括进程名，进程状态和执行次数。缓冲区：一个整数数组。缓冲区说明块：包括类型，读指针，写指针，读等待指针和写等待指针。5. 程序使用说明启动程序后，如果使用p键则运行一次生产者进程，使用c键则运行一次消费者进程。通过屏幕可以观察到两个进程的状态和缓冲区变化的情况。6. 实验流程图源程序#include#include#include#define PIPESIZE 8enum Status RUN, WAIT, READY ;#define NORMAL 0#define SLEEP 1#define AWAKE 2struct PCBchar name3;enum Status status;int time;struct waitqueuestruct PCB pcb;struct waitqueue *next;struct PCB *producer; /* write wait point */struct PCB *consumer;/* read wait point */struct waitqueue *headerqueue, *tailqueue;int writeptr;int readptr;int writein, readout;int bufferPIPESIZE;int empty, full;void runp(char in3), runc(char in3), print();int main()char in3;writeptr = 0;readptr = 0;writein = 0;empty = PIPESIZE;full = 0;producer = (struct PCB *)malloc(sizeof(struct PCB);consumer = (struct PCB *)malloc(sizeof(struct PCB);headerqueue = (struct waitqueue *)malloc(sizeof(struct waitqueue);headerqueue-next = NULL;tailqueue = headerqueue;producer-status = READY;consumer-status = WAIT;producer-time = consumer-time = 0;printf(Now starting the program!n);printf(Press p1 to run PRODUCER1,Press p1 to run PRODUCER2 n);printf(Press c1 to run CONSUMER1,Press c2 to run CONSUMER2 n);printf(Press e to exit from the program.n);while (1)strcpy(in, N);while (!strcmp(in, N)printf(n);scanf(%s, in);if (strcmp(in, e) & strcmp(in, p1) & strcmp(in, p2) & strcmp(in, c1) & strcmp(in, c2)printf(error,please input again!n);strcpy(in, N);if (p = in0)runp(in);producer-time+;else if (c = in0)runc(in);consumer-time+;else/printf(PRODUCER product %d timesn, producer-time);/printf(CONSUMER consumer %d timesn, consumer-time);exit(0);print();printf(n);void runp(char in3)if (full = 8)struct waitqueue *search;search = headerqueue-next;while (search != NULL)if (!strcmp(in, )printf(error!n);exit(1);search = search-next;producer-status = WAIT;printf(PRODUCER %s process is waiting, cant be scheduled.n, in);struct waitqueue *p = (struct waitqueue *)malloc(sizeof(struct waitqueue);strcpy(, in);p-pcb.status = WAIT;p-pcb.time = producer-time + 1;p-next = NULL;tailqueue-next = p;tailqueue = p;full+;elsewritein = (writein + 1) % 100;producer-status = RUN;printf(run PRODUCER %s process . product %d , in, writein);bufferwriteptr = writein;if (empty8)struct waitqueue *p;p = headerqueue-next;printf(run CONSUMER %s process. use %d, , bufferwriteptr);if (tailqueue = p)tailqueue = headerqueue;headerqueue-next = p-next;free(p);consumer-status = WAIT;empty-;elseif (writeptr readptr)writeptr+;if (writeptr = PIPESIZE)writeptr = 0;if (readptr = 0)producer-status = WAIT;else producer-status = READY;elsewriteptr+;if (writeptr = readptr)producer-status = WAIT;else producer-status = READY;consumer-status = READY;empty-;full+;void runc(char in3)if (empty = 8)struct waitqueue *search;search = headerqueue-next;while (search != NULL)if (!strcmp(in, )printf(error!n);exit(1);search = search-next;consumer-status = WAIT;printf(CONSUMER %s is waiting, cant be scheduled.n,in);struct waitqueue *p = (struct waitqueue *)malloc(sizeof(struct waitqueue);strcpy(, in);p-pcb.status = WAIT;p-pcb.time = consumer-time + 1;p-next = NULL;tailqueue-next = p;tailqueue = p;empty+;elseconsumer-status = RUN;readout = bufferreadptr;printf(run CONSUMER %s process. use %d , in, readout);if (full8)writein = (writein + 1) % 100;bufferwriteptr = writein;struct waitqueue *p;p = headerqueue-next;printf(run PRODUCER %s process. product %d , , bufferwriteptr);if (tailqueue = p)tailqueue = headerqueue;headerqueue-next = p-next;free(p);producer-status = WAIT;full-;writeptr+;readptr+;elseif (readptr writeptr)readptr+;if (readptr = PIPESIZE)readptr = 0;if (writeptr = 0)consumer-status = WAIT;elseconsumer-status = READY;else consumer-status = READY;elsereadptr+;if (readptr = writeptr)consumer-status = WAIT;writeptr = readptr = 0;else consumer-status = READY;producer-status = READY;full-;empty+;void print()int i = 0;int j = 0;int low = 0;int high = 0;printf(n);for (i; i PIPESIZE; i+)printf(-);printf(n);if (readptr writeptr)for (low = 0; low readptr; low+)printf(|);for (low = readptr; low writeptr; low+)printf(| %2d|, bufferlow);for (low = writeptr; low writeptr)for (low = 0; low writeptr; low+)printf(| %2d|, bufferlow);for (low = writeptr; low readptr; low+)printf(|);for (low = readptr; low status = WAIT)for (low = 0; low PIPESIZE; low+)printf(| %2d |, bufferlow);elsefor (low = 0; low PIPESIZE; low+)printf(|);printf(n);for (i = 0; i status = WAIT & NULL !=headerqueue-next)struct waitqueue *p = headerqueue-next;while (NULL != p)printf( PRODUCER