生产者消费者问题代码(共7页).doc

精选优质文档-倾情为你奉上生产者消费者问题用vc+实现 悬最佳答案 #include<windows.h>#include<fstream.h>#include<stdio.h>#include<string>#include<conio.h>/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;j<MAX_THREAD_NUM;j+) for(int k=0;k<MAX_THREAD_NUM;k+) Thread_Infoj.thread_requestk = -1; Thread_Infoj.n_request = 0; /初始化临界区； for(i =0;i< MAX_BUFFER_NUM;i+) InitializeCriticalSection(&PC_Criticali); /打开输入文件，按照规定的格式提取线程等信息； inFile.open("test.txt"); /从文件中获得实际的缓冲区的数目； inFile >> 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;k<Temp_request;k+) printf(" %d ", Thread_Infoj.thread_requestk); cout<<endl; 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;i<n_Thread;i+) for(int j=0;j<Thread_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;i<n_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 ;i<n_Buffer_or_Critical;i+) if(Buffer_Criticali=ProPos) TempPos = i; break; return TempPos;/生产者进程void Produce(void *p) /局部变量声明； DWORD wait_for_semaphore,wait_for_mutex,m_delay; int m_serial; /获得本线程的信息； m_serial = (ThreadInfo*)(p)->serial; 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;i<m_requestNum;i+) m_thread_requesti = (ThreadInfo*)(p)->thread_requesti; Sleep(m_delay); /循环进行所需产品的消费 for(i =0;i<m_requestNum;i+) /请求消费下一个产品 printf("Consumer %2d request to consume %2d productn",m_serial,m_thread_requesti); /如果对应生产者没有生产，则等待；如果生产了,允许的消费者数目-1；实现了读写同步； wait_for_semaphore=WaitForSingleObject(h_Semaphorem_thread_requesti,-1); /查询所需产品放到缓冲区的号 int BufferPos=FindBufferPosition(m_thread_requesti); /开始进行具体缓冲区的消费处理，读和读在该缓冲区上仍然是互斥的； /进入临界区后执行消费动作；并在完成此次请求后，通知另外的消费者本处请求已 /经满足；同时如果对应的产品使用完毕，就做相应处理；并给出相应动作的界面提 /示；该相应处理指将相应缓冲区清空，并增加代表空缓冲区的信号量； EnterCriticalSection(&PC_CriticalBufferPos); printf("Consumer%2d begin to consume %2d product n",m_serial,m_thread_requesti); (ThreadInfo*)(p)->thread_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(" position %2d :%3d n" ,BufferPos,Buffer_CriticalBufferPos); ReleaseSemaphore(empty_semaphore,1,NULL); elseprintf("Consumer %2d finish consuming product %2dn ",m_serial,m_thread_requesti); /离开临界区 LeaveCriticalSection(&PC_CriticalBufferPos); 分享给你的朋友吧：·····对我有帮助8专心-专注-专业