Python os.wait()方法

Python中的os.wait()方法被进程用来等待子进程的完成。

此方法返回一个包含其PID和退出状态指示的元组。子进程的退出状态由一个16位数字表示，其低字节是终止进程的信号数，高字节是退出状态(如果信号数为零)。

os.wait 语法

os.wait()

os.wait 参数

不需要参数。

返回类型:该方法返回一个元组，其中包含终止子进程的PID和退出状态指示。

os.wait 示例

使用os.wait()方法

# Python program to explain os.wait() method 
  
# importing os module  
import os 
  
# Create a child process
# using os.fork() method 
pid = os.fork()
  
  
# a Non-zero process id (pid)
# indicates the parent process 
if pid :
      
    # Wait for the completion of
    # child process using
    # os.wait() method    
    status = os.wait()
    print("\nIn parent process-")
    print("Terminated child's process id:", status[0])
    print("Signal number that killed the child process:", status[1])
  
else :
    print("In Child process-")
    print("Process ID:", os.getpid())
    print("Hello ! Geeks")
    print("Exiting")
      
  
# using os.wait() method    
# Parent process will wait till 
# the completion of child process
# and then only it will 
# begin its execution

输出:

In Child process-
Process ID: 6276
Hello! Geeks
Exiting

In parent process-
Terminated child's process id: 6276
Signal number that killed the child process: 0