1 #include <stdio.h>
2 #include <process.h>
3 #include <Windows.h>
4 //信号量与关键段
5 CRITICAL_SECTION g_cs;
6 HANDLE Empty,Full;
7
8 const int BUFFER_SIZE=10;//10个缓冲池
9 const int numofp=2;//生产者线程数
10 const int numofc=2;//消费者线程数
11 const int numofpr=100;//要生产的产品数
12 int buffer[BUFFER_SIZE];
13 int pf=0,pe=0;
14 int count=1;
15 int count_c=1;
16 int mp=0;
17
18 //生产者
19 unsigned int __stdcall Producer(PVOID p){
20
21 while(true){
22 //等待有空的缓冲区出现
23 WaitForSingleObject(Empty, INFINITE);
24 //互斥的访问缓冲区
25 EnterCriticalSection(&g_cs);
26 if(count>numofpr){
27 LeaveCriticalSection(&g_cs);
28 ReleaseSemaphore(Full,1,NULL);
29 break;
30 }
31 buffer[pe]=++mp;
32 //printf("%d,",*((int *)p));
33 printf("编号为%d的生产者从第%d个空缓冲池中写入数据%d\n",*((int *)p),pe,buffer[pe]);
34 pe=(pe+1)%BUFFER_SIZE;
35 count++;
36 LeaveCriticalSection(&g_cs);
37 //通知消费者有新数据了
38 ReleaseSemaphore(Full,1,NULL);
39 }
40 return 0;
41 }
42 //消费者
43 unsigned int __stdcall Consumer(PVOID p){
44
45 while(true){
46 WaitForSingleObject(Full,INFINITE);
47 EnterCriticalSection(&g_cs);
48 if(count_c>numofpr){
49 LeaveCriticalSection(&g_cs);
50 ReleaseSemaphore(Empty,1,NULL);
51 break;
52 }
53 //printf("%d,",*((int *)p));
54 printf(" 编号为%d的消费者从第%d个FULL缓冲区中取出数据%d\n",*((int *)p),pf,buffer[pf]);
55 pf=(pf+1)%BUFFER_SIZE;
56 count_c++;
57 LeaveCriticalSection(&g_cs);
58 ReleaseSemaphore(Empty,1,NULL);
59 }
60 return 0;
61 }
62
63 int main(){
64 printf(" 生产者消费者问题:%d生产者-%d消费者-%d缓冲区-%d个产品\n\n",numofp,numofc,BUFFER_SIZE,numofpr);
65 InitializeCriticalSection(&g_cs);//初始化一个临界区对象
66 //初始化信号量,一个记录有产品的缓冲区个数,另一个记录空缓冲区个数.
67 Empty=CreateSemaphore(NULL,10,10,NULL);
68 Full=CreateSemaphore(NULL,0,10,NULL);
69 const int THREADNUM=numofc+numofp;//线程数
70 HANDLE hThread[THREADNUM];
71 //生产者线程
72 int a=1,b=2,c=3,d=4;
73 hThread[0]=(HANDLE)_beginthreadex(
74 NULL,//安全属性，NULL为默认安全属性
75 0,//指定线程堆栈的大小,一般为0
76 Producer,//指定线程函数的地址
77 &a,//传递给线程的参数的指针
78 0,//线程初始状态，0:立即运行
79 NULL);//用于记录线程ID的地址
80
81 hThread[1]=(HANDLE)_beginthreadex(NULL,0,Producer,&b,0,NULL);
82
83 hThread[2]=(HANDLE)_beginthreadex(NULL,0,Consumer,&c,0,NULL);
84
85 hThread[3]=(HANDLE)_beginthreadex(NULL,0,Consumer,&d,0,NULL);
86 WaitForMultipleObjects(THREADNUM, hThread, TRUE, INFINITE);
87 for (int i = 0; i < THREADNUM; i++)
88 CloseHandle(hThread[i]);
89
90 //销毁信号量和关键段
91 CloseHandle(Empty);
92 CloseHandle(Full);
93 DeleteCriticalSection(&g_cs);
94 system("pause");
95
96 return 0;
97 }
