ADD file via upload

3.2.txt

@@ -0,0 +1,48 @@
+#include <stdio.h>   
+#include <stdlib.h>   
+#include <pthread.h>   
+#include <unistd.h>   
+#include <sys/types.h>   
+#include <semaphore.h>   
+int n=10, in=0,out=0,buffer[10];
+sem_t empty,full;
+void* producer(void *arg){
+    int tag= pthread_self()%100;
+    int nextPro;
+    srand(time(NULL)+tag);
+    while(1){
+        nextPro = rand()%97;
+        sem_wait(&empty);
+        buffer[in] = nextPro;
+        printf("production:%d %d\n",nextPro,buffer[in]); 
+usleep(1000*1000/20);
+        in = (in+1)%n;
+        sem_post(&full);
+        usleep(1000*1000/2);
+    }
+} 
+void* consumer(void *arg)  {
+    int item;
+    while(1){
+        sem_wait(&full);
+        item = buffer[out];
+        sem_post(&empty);
+        printf("consume:%d\n",buffer[out]);
+        out = (out+1)%n;
+        usleep(1000*1000/10);
+    }
+}
+int main()  {  
+	pthread_t tid[7];  
+    //<2F><>ʼ<EFBFBD><CABC>10<31><30><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
+    sem_init( &empty, 0,10);
+    sem_init( &full, 0,0);
+    //pthread_create(&tid[0], NULL, producer, NULL); 
+    for(int i=0;i<6;i++){
+        pthread_create(&tid[i], NULL, producer,NULL); 
+    }
+	pthread_create(&tid[6], NULL, consumer, NULL);  
+	for(int i = 0; i < 7; i++)  
+		pthread_join(tid[i], NULL);      
+	printf("main is over\n");
+}