diff --git a/lab7/mushding_ver/A_mushding.c b/lab7/mushding_ver/A_mushding.c
new file mode 100644
index 0000000..b43a2fb
--- /dev/null
+++ b/lab7/mushding_ver/A_mushding.c
@@ -0,0 +1,50 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/msg.h>
+#include <errno.h>
+ 
+#define MAX_TEXT 512
+ 
+struct msg_st
+{
+    long int msg_type;
+    char text[MAX_TEXT];
+};
+ 
+int main(int argc, char **argv)
+{
+    struct msg_st data;
+    char buffer[BUFSIZ];
+    int msgid = -1;
+ 
+    // 建立消息?列
+    msgid = msgget((key_t)1234, 0666 | IPC_CREAT);
+ 
+    // 向消息?里中?消息，直到?入end
+    while (1)
+    {
+        printf("Enter some text: \n");
+        fgets(buffer, BUFSIZ, stdin);
+        data.msg_type = 1; // 注意2
+        strcpy(data.text, buffer);
+ 
+        // 向?列里?送?据
+        if (msgsnd(msgid, (void *)&data, MAX_TEXT, 0) == -1)
+        {
+            fprintf(stderr, "msgsnd failed\n");
+            exit(EXIT_FAILURE);
+        }
+ 
+        // ?入end?束?入
+        if (strncmp(buffer, "exit\n", 3) == 0)
+        {
+            break;
+        }
+ 
+        sleep(1);
+    }
+ 
+    exit(EXIT_SUCCESS);
+}
\ No newline at end of file
diff --git a/lab7/mushding_ver/B_mushding.c b/lab7/mushding_ver/B_mushding.c
new file mode 100644
index 0000000..969132e
--- /dev/null
+++ b/lab7/mushding_ver/B_mushding.c
@@ -0,0 +1,40 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/msg.h>
+#include <errno.h>
+
+struct msg_st
+{
+    long int msg_type;
+    char text[BUFSIZ];
+};
+
+int main(int argc, char **argv)
+{
+    int msgid = -1;
+    struct msg_st data;
+    long int msgtype = 0;   // 瘜冽?1
+
+    // 撱箇?瘨����?��?
+    msgid = msgget((key_t)1234, 0666 | IPC_CREAT);
+
+    // 隞��??�銝�?瑕?瘨���荔�����?圈??送nd瘨���臭蛹甇�
+    while (1)
+    {
+        if (msgrcv(msgid, (void *)&data, BUFSIZ, msgtype, 0) == -1)
+        {
+            fprintf(stderr, "msgrcv failed width erro: %d", errno);
+        }
+
+        printf("You wrote: %s\n", data.text);
+
+        // ?���送nd蝏��?
+        if (strncmp(data.text, "exit\n", 3) == 0)
+        {
+            break;
+        }
+    }
+
+    exit(EXIT_SUCCESS);
+}
diff --git a/lab7/mushding_ver/csu_mushding.c b/lab7/mushding_ver/csu_mushding.c
new file mode 100644
index 0000000..0379bd7
--- /dev/null
+++ b/lab7/mushding_ver/csu_mushding.c
@@ -0,0 +1,42 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/ipc.h>
+#include <sys/shm.h>
+
+#define TEXT_SZ 2048
+   
+struct shared_use_st{
+    int written_by_you;
+    char some_text[TEXT_SZ];
+};
+
+int main(){
+    int running = 1;
+    int shmid;
+    void *shared_memory=(void *) 0;
+    struct shared_use_st *shared_stuff;
+   
+    srand((unsigned int)getpid());
+   
+    shmid = shmget((key_t)1234,sizeof(struct shared_use_st),0666|IPC_CREAT);
+    shared_memory = shmat(shmid,(void *) 0,0);
+   
+    shared_stuff = (struct shared_use_st *)shared_memory;
+    shared_stuff->written_by_you = 0;
+   
+    while(running){
+        if (shared_stuff->written_by_you){
+            printf("You wrote:%s",shared_stuff->some_text);
+            sleep(rand()%4);
+            shared_stuff->written_by_you = 0;
+           
+            if (strncmp(shared_stuff ->some_text,"exit\n",3) == 0){
+                running =0;
+            }
+        }
+    }    
+    exit(EXIT_SUCCESS);
+}
diff --git a/lab7/mushding_ver/pro_mushding.c b/lab7/mushding_ver/pro_mushding.c
new file mode 100644
index 0000000..9e8388e
--- /dev/null
+++ b/lab7/mushding_ver/pro_mushding.c
@@ -0,0 +1,42 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/ipc.h>
+#include <sys/shm.h>
+
+#define TEXT_SZ 2048
+   
+struct shared_use_st{
+    int written_by_you;
+    char some_text[TEXT_SZ];
+};
+
+int main(){
+    int running = 1;
+    int shmid;
+    void *shared_memory=(void *) 0;
+    struct shared_use_st *shared_stuff;
+   
+    char buffer[BUFSIZ];
+   
+    shmid = shmget((key_t)1234,sizeof(struct shared_use_st),0666|IPC_CREAT);
+    shared_memory = shmat(shmid,(void *) 0,0);
+    shared_stuff = (struct shared_use_st *)shared_memory;
+   
+    while(running){
+       
+        printf("Enter some text: ");
+        fgets(buffer,BUFSIZ,stdin);
+       
+        strncpy(shared_stuff->some_text,buffer,TEXT_SZ);
+        shared_stuff->written_by_you =1;
+       
+        if (strncmp(buffer,"exit\n",3) == 0){
+            running = 0;
+        }
+    }
+   
+    exit(EXIT_SUCCESS);
+}
\ No newline at end of file