如下所示:#coding:utf-8importosimportpsutilimporttimedefwrite_pid():pid=os.getpid()fp=open("pid.log",'w')fp.write(s
如下所示:
# coding: utf-8
import os
import psutil
import time
def write_pid():
pid = os.getpid()
fp = open("pid.log",'w')
fp.write(str(pid))
fp.close()
def read_pid():
if os.path.exists("pid.log"):
fp = open("pid.log",'r')
pid = fp.read()
fp.close()
return pid
else:
return False
def write_log(log_content):
time_now = time.strftime("%Y-%m-%d %H:%M:%S", time.localtime())
log_content = time_now+"---->"+log_content+os.linesep
fp = open('recognition.log','a+')
fp.write(log_content)
fp.close()
def run():
pid = read_pid()
#print pid
pid = int(pid)
if pid:
running_pid = psutil.pids()
if pid in running_pid:
log_content = "process is running..."
write_log(log_content)
else:
write_pid()
time.sleep(20)
else:
write_pid()
time.sleep(20)
if __name__ == "__main__":
run()
实现思路:
1)用os.getpid()获取当前程序运行PID,将PID存入文件中
2)用psutil模块获取当前系统所有正在运行的pid
3)读取之前存入的PID,判断该PID是否在系统PID中
4)如果文件中的PID在系统PID中,则退出程序,否则存入新的PID,运行程序。
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python 判断 自身 运行