Mar 6th

C-002 · C-002 · commit 5d1b63d46d61 · 2019-03-06T22:48:24.000+08:00
diff --git a/System/Processes/child.py b/System/Processes/child.py
@@ -0,0 +1,3 @@
+import os, sys
+
+print('Hello from child', os.getpid(), sys.argv[1])
diff --git a/System/Processes/fork-count.py b/System/Processes/fork-count.py
@@ -0,0 +1,16 @@
+import os, time
+def counter(count):
+    for i in range(count):
+        time.sleep(1)
+        print('[%s] => %s' % (os.getpid(), i))
+    os._exit(0)
+
+for i in range(5):
+    pid = os.fork()
+    if pid != 0:
+        print('Process %d spawned' % pid)
+    else:
+        counter(i)
+        #os._exit(0)
+
+print('Main process exiting.')
diff --git a/System/Processes/fork-exec.py b/System/Processes/fork-exec.py
@@ -0,0 +1,12 @@
+import os
+
+parm = 0
+while True:
+    parm += 1
+    pid = os.fork()
+    if pid == 0:
+        os.execlp('python', 'python', 'child.py', str(parm))
+        assert False, 'error starting program'
+    else:
+        print('Child is', pid)
+        if input() == 'q': break
diff --git a/System/Processes/fork1.py b/System/Processes/fork1.py
@@ -0,0 +1,18 @@
+
+
+import os
+
+def child():
+    print('Hello from child', os.getpid())
+    os._exit(0)
+
+def parent():
+    while True:
+        newpid = os.fork()
+        if newpid == 0:
+            child()
+        else:
+            print('Hello from parent', os.getpid(), newpid)
+        if input() == 'q': break
+
+parent()

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,3 @@`
	`1`	`+import os, sys`
	`2`	`+`
	`3`	`+print('Hello from child', os.getpid(), sys.argv[1])`