homework 2_3

2.进程控制/homework/code/1_topology_3.c

 #include <stdio.h>
 #include <unistd.h>
+/*
+  |   |   `-1_topology_3
+  |   |       |-1_topology_3
+  |   |       |   |-1_topology_3
+  |   |       |   |   |-1_topology_3
+  |   |       |   |   `-1_topology_3
+  |   |       |   `-1_topology_3
+  |   |       |       |-1_topology_3
+  |   |       |       `-1_topology_3
+  |   |       `-1_topology_3
+  |   |           |-1_topology_3
+  |   |           |   |-1_topology_3
+  |   |           |   `-1_topology_3
+  |   |           `-1_topology_3
+  |   |               |-1_topology_3
+  |   |               `-1_topology_3
+  |   |   |-grep --color=auto 1_topology_3
 
+*/
 void btree_fork(num)
 {
     num--;
     if (num != -1)
     {
-        int pid = fork();
-        if(pid == -1) 
+        int j = 0;
+        for (j = 0; j < 2; ++j)
         {
-            printf("error!\n");
-        } 
-        else if(pid ==0) 
-        {
-            printf("This is the child process %d!\n",num);
-            recursive_fork(num);
-            getchar();
-        } 
+            int pid = fork();
+            if(pid == -1) 
+            {
+                printf("error!\n");
+            } 
+            else if(pid ==0) 
+            {
+                printf("This is the child process %d_%d\n",j);
+                btree_fork(num);
+                getchar();
+            } 
+        }
+
     }
 }
 
 int main(int argc, char ** argv )
 {   
     int i = 0;
-    recursive_fork(10);
+    btree_fork(3);
     {
         printf("This is the parent process!\n");
         getchar();

2.进程控制/homework/code/3_pthread.c

+#include <stdio.h>
+#include <stdlib.h>
+#include <pthread.h>
+void thread(void)
+{
+    // int i = 0;
+    printf("This is a pthread. address is %p\n", &thread);
+    sleep(10);
+}
+int main(void)
+{
+    pthread_t id[10];
+    int i,ret;
+    for(i=0;i<10;i++)
+    {
+        ret=pthread_create(&id[i],NULL,(void *) thread,NULL);
+        if(ret!=0)
+        {
+        printf ("Create pthread error!\n");
+        exit (1);
+        }
+    }
+    printf("This is the main process.address is %p\n", &main);
+    for(i=0;i<10;i++)
+    {
+        pthread_join(id[i],NULL);
+    }
+    return (0);
+}
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2.进程控制/record/code/pthread-100-demo.c

+#include <stdio.h>
+#include <stdlib.h>
+#include <pthread.h>
+void thread(void)
+{
+    printf("This is a pthread.\n");
+    sleep(10);
+}
+int main(void)
+{
+    pthread_t id[100];
+    int i,ret;
+    for(i=0;i<100;i++)
+    {
+        ret=pthread_create(&id[i],NULL,(void *) thread,NULL);
+        if(ret!=0)
+        {
+        printf ("Create pthread error!\n");
+        exit (1);
+        }
+    }
+    printf("This is the main process.\n");
+    for(i=0;i<100;i++)
+    {
+        pthread_join(id[i],NULL);
+    }
+    return (0);
+}
\ No newline at end of file

2.进程控制/record/code/pthread-demo.c

+#include <stdio.h>
+#include <stdlib.h>
+#include <pthread.h>
+void thread(void)
+{
+    printf("This is a pthread.\n");
+    sleep(10);
+}
+int main(void)
+{
+    pthread_t id;
+    int i,ret;
+    ret=pthread_create(&id,NULL,(void *) thread,NULL);
+    if(ret!=0)
+    {
+        printf ("Create pthread error!\n");
+        exit (1);
+    }
+    printf("This is the main process.\n");
+    pthread_join(id,NULL);
+    return (0);
+}
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