From d7da4a8ad2b341673c3cecf00a97ff664d8f6cfa Mon Sep 17 00:00:00 2001
From: pfb6s459y <3522880783@qq.com>
Date: Sun, 10 Apr 2022 17:58:29 +0800
Subject: [PATCH] ADD file via upload

---
 3.1.txt | 45 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)
 create mode 100644 3.1.txt

diff --git a/3.1.txt b/3.1.txt
new file mode 100644
index 0000000..f1d5ef5
--- /dev/null
+++ b/3.1.txt
@@ -0,0 +1,45 @@
+#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[2];  
+    //初始有10个缓冲区
+    sem_init( &empty, 0,10);
+    sem_init( &full, 0,0);
+    pthread_create(&tid[0], NULL, producer, NULL);  
+	pthread_create(&tid[1], NULL, consumer, NULL);  
+	for(int i = 0; i < 2; i++)  
+		pthread_join(tid[i], NULL);      
+	printf("main is over\n");
+}  
\ No newline at end of file