生产者与消费者算法.doc

#include#include#include#include#include/定义一些常量；/本程序允许的最大临界区数；#define MAX_BUFFER_NUM 10/秒到微秒的乘法因子；#define INTE_PER_SEC 1000/本程序允许的生产和消费线程的总数；#define MAX_THREAD_NUM 64/定义一个结构，记录在测试文件中指定的每一个线程的参数struct ThreadInfo int serial; /线程序列号 char entity; /是P还是C double delay; /线程延迟 int thread_requestMAX_THREAD_NUM; /线程请求队列 int n_request; /请求个数;/全局变量的定义/临界区对象的声明,用于管理缓冲区的互斥访问；CRITICAL_SECTION PC_CriticalMAX_BUFFER_NUM; int Buffer_CriticalMAX_BUFFER_NUM; /缓冲区声明，用于存放产品；HANDLE h_ThreadMAX_THREAD_NUM; /用于存储每个线程句柄的数组；ThreadInfo Thread_InfoMAX_THREAD_NUM; /线程信息数组；HANDLE empty_semaphore; /一个信号量；HANDLE h_mutex; /一个互斥量；DWORD n_Thread = 0; /实际的线程的数目；DWORD n_Buffer_or_Critical; /实际的缓冲区或者临界区的数目；HANDLE h_SemaphoreMAX_THREAD_NUM; /生产者允许消费者开始消费的信号量；/生产消费及辅助函数的声明void Produce(void *p);void Consume(void *p); bool IfInOtherRequest(int);int FindProducePositon();int FindBufferPosition(int);int main(void) /声明所需变量； DWORD wait_for_all; ifstream inFile; /初始化缓冲区； for(int i=0;i MAX_BUFFER_NUM;i+) Buffer_Criticali = -1; /初始化每个线程的请求队列； for(int j=0;jMAX_THREAD_NUM;j+) for(int k=0;kMAX_THREAD_NUM;k+) Thread_Infoj.thread_requestk = -1; Thread_Infoj.n_request = 0; /初始化临界区； for(i =0;i n_Buffer_or_Critical; inFile.get(); printf(输入文件是:n); /回显获得的缓冲区的数目信息； printf(%d n,(int) n_Buffer_or_Critical); /提取每个线程的信息到相应数据结构中； while(inFile) inFile Thread_Infon_Thread.serial; inFile Thread_Infon_Thread.entity; inFile Thread_Infon_Thread.delay; char c; inFile.get(c); while(c!=n& !inFile.eof() inFile Thread_Infon_Thread.thread_requestThread_Infon_Thread.n_request+; inFile.get(c); n_Thread+; /回显获得的线程信息，便于确认正确性； for(j=0;j(int) n_Thread;j+) int Temp_serial = Thread_Infoj.serial; char Temp_entity = Thread_Infoj.entity; double Temp_delay = Thread_Infoj.delay; printf( n thread%2d %c %f ,Temp_serial,Temp_entity,Temp_delay); int Temp_request = Thread_Infoj.n_request; for(int k=0;kTemp_request;k+) printf( %d , Thread_Infoj.thread_requestk); coutendl; printf(nn); /创建在模拟过程中几个必要的信号量 empty_semaphore=CreateSemaphore(NULL,n_Buffer_or_Critical,n_Buffer_or_Critical, semaphore_for_empty); h_mutex = CreateMutex(NULL,FALSE,mutex_for_update); /下面这个循环用线程的ID号来为相应生产线程的产品读写时所 /使用的同步信号量命名； for(j=0;j(int)n_Thread;j+) std:string lp =semaphore_for_produce_; int temp =j; while(temp) char c = (char)(temp%10); lp+=c; temp/=10; h_Semaphorej+1=CreateSemaphore(NULL,0,n_Thread,lp.c_str(); /创建生产者和消费者线程； for(i =0;i (int) n_Thread;i+) if(Thread_Infoi.entity =P) h_Threadi= CreateThread(NULL,0,(LPTHREAD_START_ROUTINE)(Produce), &(Thread_Infoi),0,NULL); else h_Threadi=CreateThread(NULL,0,(LPTHREAD_START_ROUTINE)(Consume), &(Thread_Infoi),0,NULL); /主程序等待各个线程的动作结束； wait_for_all = WaitForMultipleObjects(n_Thread,h_Thread,TRUE,-1); printf( n nALL Producer and consumer have finished their work. n); printf(Press any key to quit!n); _getch(); return 0;/确认是否还有对同一产品的消费请求未执行；bool IfInOtherRequest(int req) for(int i=0;in_Thread;i+) for(int j=0;jThread_Infoi.n_request;j+) if(Thread_Infoi.thread_requestj = req) return TRUE; return FALSE;/找出当前可以进行产品生产的空缓冲区位置；int FindProducePosition() int EmptyPosition; for (int i =0;in_Buffer_or_Critical;i+) if(Buffer_Criticali = -1) EmptyPosition = i; /用下面这个特殊值表示本缓冲区正处于被写状态； Buffer_Criticali = -2; break; return EmptyPosition;/找出当前所需生产者生产的产品的位置；int FindBufferPosition(int ProPos) int TempPos; for (int i =0 ;iserial; m_delay = (DWORD)(ThreadInfo*)(p)-delay *INTE_PER_SEC); Sleep(m_delay); /开始请求生产 printf(Producer %2d sends the produce require.n,m_serial); /确认有空缓冲区可供生产，同时将空位置数empty减1；用于生产者和消费者的同步； wait_for_semaphore = WaitForSingleObject(empty_semaphore,-1); /互斥访问下一个可用于生产的空临界区，实现写写互斥； wait_for_mutex = WaitForSingleObject(h_mutex,-1); int ProducePos = FindProducePosition(); ReleaseMutex(h_mutex); /生产者在获得自己的空位置并做上标记后，以下的写操作在生产者之间可以并发； /核心生产步骤中，程序将生产者的ID作为产品编号放入，方便消费者识别; printf(Producer %2d begin to produce at position %2d.n,m_serial,ProducePos); Buffer_CriticalProducePos = m_serial; printf(Producer %2d finish producing :n ,m_serial); printf( position %2d :%3d n ,ProducePos,Buffer_CriticalProducePos); /使生产者写的缓冲区可以被多个消费者使用，实现读写同步； ReleaseSemaphore(h_Semaphorem_serial,n_Thread,NULL);/消费者进程void Consume(void * p) /局部变量声明； DWORD wait_for_semaphore,m_delay; int m_serial,m_requestNum; /消费者的序列号和请求的数目； int m_thread_requestMAX_THREAD_NUM;/本消费线程的请求队列； /提取本线程的信息到本地； m_serial = (ThreadInfo*)(p)-serial; m_delay = (DWORD)(ThreadInfo*)(p)-delay *INTE_PER_SEC); m_requestNum = (ThreadInfo *)(p)-n_request; for (int i = 0;ithread_requesti; Sleep(m_delay); /循环进行所需产品的消费 for(i =0;ithread_requesti =-1; if(!IfInOtherRequest(m_thread_requesti) Buffer_CriticalBufferPos = -1;/标记缓冲区为空； printf(Consumer%2d finish consuming %2d:n ,m_serial,m_thread_requesti); printf