From ec3247c0b187d3d974a8ecf9040fb943d15e456d Mon Sep 17 00:00:00 2001
From: pzu4aoly2 <a1661281574@163.com>
Date: Sat, 16 Apr 2022 18:24:27 +0800
Subject: [PATCH 1/2] =?UTF-8?q?Update=20=E5=AE=9E=E9=AA=8C2.1?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 实验2.1 | 21 ++++++++++-----------
 1 file changed, 10 insertions(+), 11 deletions(-)

diff --git a/实验2.1 b/实验2.1
index 2f034a5..bf3a114 100644
--- a/实验2.1
+++ b/实验2.1
@@ -4,28 +4,28 @@
 #include <unistd.h>
 #include <sys/types.h>
 #include <semaphore.h>
-int n=10, in=0,out=0,buffer[10];
-sem_t empty,full;
+int n=10, in=0,out=0,buffer[10];//定义变量并创建数组。
+sem_t empty,full;//定义信号量
 
 void* producer(void *arg){
-    int tag= pthread_self()%100;
+    int tag= pthread_self()%100;//线程信号
     int nextPro;
-    srand(time(NULL)+tag);
+    srand(time(NULL)+tag);//随机数种子
     while(1){
         nextPro = rand()%97;
-        sem_wait(&empty);
+        sem_wait(&empty);//empty–1
         buffer[in] = nextPro;
         printf("production:%d %d\n",nextPro,buffer[in]);
         usleep(1000*1000/20);
         in = (in+1)%n;
-        sem_post(&full);
+        sem_post(&full);//full+1
         usleep(1000*1000/2);
     }
 }
 void* consumer(void *arg)  {
     int item;
     while(1){
-        sem_wait(&full);
+        sem_wait(&fullfull
         item = buffer[out];
         sem_post(&empty);
         printf("consume:%d\n",buffer[out]);
@@ -35,12 +35,11 @@ void* consumer(void *arg)  {
 }
 int main() {
     pthread_t tid[7];
-    //初始有10个缓冲区 
     sem_init( &empty, 0,10);
-    sem_init( &full, 0,0);
+    sem_init( &full, 0,0);//初始化信号量
     for(int i=0;i<6;i++)
-        pthread_create(&tid[i], NULL, producer, NULL);
-    pthread_create(&tid[6], NULL, consumer, NULL);
+        pthread_create(&tid[i], NULL, producer, NULL);//创建生产者
+    pthread_create(&tid[6], NULL, consumer, NULL);//创建消费者
     for(int i = 0; i<7; i++)
         pthread_join(tid[i], NULL);
     printf("main is over\n");
-- 
2.34.1


From e4d3a41e12c59f2723bc0823dec4b77570cf0039 Mon Sep 17 00:00:00 2001
From: pzu4aoly2 <a1661281574@163.com>
Date: Sat, 16 Apr 2022 18:26:09 +0800
Subject: [PATCH 2/2] =?UTF-8?q?Update=20=E5=AE=9E=E9=AA=8C2.1?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 实验2.1 | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/实验2.1 b/实验2.1
index bf3a114..6d7c600 100644
--- a/实验2.1
+++ b/实验2.1
@@ -25,9 +25,9 @@ void* producer(void *arg){
 void* consumer(void *arg)  {
     int item;
     while(1){
-        sem_wait(&fullfull
+        sem_wait(&full)//full–1
         item = buffer[out];
-        sem_post(&empty);
+        sem_post(&empty);//empty+1
         printf("consume:%d\n",buffer[out]);
         out = (out+1)%n;
         usleep(1000*1000/10);
@@ -41,6 +41,6 @@ int main() {
         pthread_create(&tid[i], NULL, producer, NULL);//创建生产者
     pthread_create(&tid[6], NULL, consumer, NULL);//创建消费者
     for(int i = 0; i<7; i++)
-        pthread_join(tid[i], NULL);
+        pthread_join(tid[i], NULL);//等待线程结束
     printf("main is over\n");
 }   
\ No newline at end of file
-- 
2.34.1