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python进阶之进程与线程 (上)

  • 2026-06-17 18:33:51
python进阶之进程与线程 (上)

进程与线程

1.一些核心概念:

并发VS并行

并发:在一段时间内,当cpu面对多个任务时候,会将每个任务交替执行一段时间

特点:1.对于某个瞬间,cpu只是在执行一个任务

2.cpu通过高频切换不同的任务,让每个任务都能得到推进,仿佛多个任务在同时执行

并行:并行依赖多个cpu,同一时刻,每个cpu执行不同的任务

特点:通过多个cpu同时工作的方式,让多个任务同时执行

同步vs异步

同步:发起一个任务之后,需要等该任务完成后,才能执行后续任务

表现为当前执行流会被阻塞

异步:发起一个任务之后,不必等该任务完成,可以继续执行其他任务

表现为当前执行流不会被阻塞

对比:

并发/并行:描述的是任务如何被执行,多个任务执行时,cpu怎么处理

同步/异步:描述的是任务如何被组织和等待,即:是否等当前任务执行完,再进行下一个任务

进程vs线程

进程:一个正在运行的程序,背后有一或多个线程

进程是操作系统进行资源分配的基本单位

每个进程有自己独立的一块内存空间

线程:线程是进程内部的执行单元,一个进程有多个线程

主进程VS子进程

python查看进程pid

os.getpid():获取当前进程ID
os.getppid():获取父进程ID

2.process创建线程

multiprocessing创建进程对象

import os
import time
from multiprocessing import  Process
print(100,__name__,os.getpid())

def speak():
print(f"我是子进程speek,我的pid{os.getpid()},父进程:{os.getppid()}")
    time.sleep(1)



def study():
print(f"我是子进程study,我的pid{os.getpid()},父进程:{os.getppid()}")
    time.sleep(1)
#如果是主进程
if __name__=='__main__':
print("我是主进程")
创建了p1和p2两个process的实例对象,此时p1和p2对应两个子进程,创建它们的时候,指定好他们要执行的任务,此时他们只是两个进程对象,还没有创建进程
    p1=Process(target=speak)
    p2=Process(target=study)
调用start方法,会立刻申请一个进程,交给操作系统调度
    p1.start()
    p2.start()

关于process参数

在实例化 Process 时,可以传递以下参数:

  🔸group: 默认值为None(应当始终为None)。

  🔸target:子进程要执行的可调用对象,默认值为 None。

  🔸name:  进程名称,默认为 None ,如果设置为 None,Python 会自动分配名字。

  🔸args:  给 target 传的位置参数(元组)

  🔸kwargs:给 target 传的关键字参数(字典)。

  🔸daemon:标记进程是否为守护进程,取值为布尔值(默认为 None,表示从创建方继承)。
import os
import time
from multiprocessing import  Process
print(100,__name__,os.getpid())

def speak():
print(f"我是子进程speek,我的pid{os.getpid()},父进程:{os.getppid()}")
    time.sleep(1)
def speak1(a,b,msg):
print(f"我是子进程speek1,{a},{b},{msg},{current_process().name}我的pid{os.getpid()},父进程:{os.getppid()}")
    time.sleep(1)


def study():
print(f"我是子进程study,我的pid{os.getpid()},父进程:{os.getppid()}")
    time.sleep(1)
#如果是主进程
if __name__=='__main__':
print("我是主进程")

    p1=Process(target=speak)
    p2=Process(target=study)
    p3=Process(target=speak1,name="speak",args=(666,999),kwargs={'msg':'msg'})

    p1.start()
    p2.start()
    p3.start()

进程控制

1.Lock进程锁

防止多个进程同时打印或操作同一资源导致数据错乱,可以使用Lock

lock.acquire()上锁

lock.release()释放锁

上下文管理器用法:

with lock:

传统死锁的方式

import os
import time
from multiprocessing import  Process,current_process,Lock
print(100,__name__,os.getpid())

def speak(lock):
    lock.acquire()
print(f"我是子进程speek,我的pid{os.getpid()},父进程:{os.getppid()}")
    lock.release()
    time.sleep(1)

def speak1(a,b,msg):
print(f"我是子进程speek1,{a},{b},{msg},{current_process().name}我的pid{os.getpid()},父进程:{os.getppid()}")
    time.sleep(1)


def study(lock):
    with lock:
print(f"我是子进程study,我的pid{os.getpid()},父进程:{os.getppid()}")
        time.sleep(1)

#如果是主进程
if __name__=='__main__':
print("我是主进程")
    lock=Lock()

    p1=Process(target=speak,args=(lock,))
    p2=Process(target=study,args=(lock,))
    p3=Process(target=speak1,name="speak",args=(666,999),kwargs={'msg':'msg'})

    p1.start()
    p2.start()
    p3.start()

传统上锁会导致死锁状态,因此我们用Rlock()

import os
import time
from multiprocessing import  Process,current_process,Lock,RLock


print(100,__name__,os.getpid())

def speak(lock):
    lock.acquire()
print(f"我是子进程speek,我的pid{os.getpid()},父进程:{os.getppid()}")
    lock.release()
    time.sleep(1)

def speak1(a,b,msg):
print(f"我是子进程speek1,{a},{b},{msg},{current_process().name}我的pid{os.getpid()},父进程:{os.getppid()}")
    time.sleep(1)


def study(lock):
    with lock:
print(f"我是子进程study,我的pid{os.getpid()},父进程:{os.getppid()}")
        time.sleep(1)

#如果是主进程
if __name__=='__main__':
print("我是主进程")
    lock=RLock()

    p1=Process(target=speak,args=(lock,))
    p2=Process(target=study,args=(lock,))
    p3=Process(target=speak1,name="speak",args=(666,999),kwargs={'msg':'msg'})

    p1.start()
    p2.start()
    p3.start()

join方法

阻塞当前进程,直接调用join的进程执行完毕

参数:join(timeout) timeout为超时时间,时间到了进程还没结束,主进程就不等了,会继续执行

join()必须在start()后面调用

import os
import time
from multiprocessing import  Process,current_process,Lock,RLock


print(100,__name__,os.getpid())

def speak(lock):
    lock.acquire()
print(f"我是子进程speek,我的pid{os.getpid()},父进程:{os.getppid()}")
    lock.release()
    time.sleep(1)

def speak1(a,b,msg):
print(f"我是子进程speek1,{a},{b},{msg},{current_process().name}我的pid{os.getpid()},父进程:{os.getppid()}")
    time.sleep(1)


def study(lock):
    with lock:
print(f"我是子进程study,我的pid{os.getpid()},父进程:{os.getppid()}")
        time.sleep(1)

#如果是主进程
if __name__=='__main__':
print("我是主进程")
    lock=RLock()

    p1=Process(target=speak,args=(lock,))
    p2=Process(target=study,args=(lock,))
    p3=Process(target=speak1,name="speak",args=(666,999),kwargs={'msg':'msg'})

    p1.start()
    p1.join(5)
    p2.start()
    p2.join(5)
    p3.start()

terminate方法

向操作系统申请强制终止进程,可以用is_alive()判断进程是否还活着

import os
import time
from multiprocessing import  Process,current_process,Lock,RLock


print(100,__name__,os.getpid())

def speak(lock):
    lock.acquire()
print(f"我是子进程speek,我的pid{os.getpid()},父进程:{os.getppid()}")
    lock.release()
    time.sleep(1)

def speak1(a,b,msg):
print(f"我是子进程speek1,{a},{b},{msg},{current_process().name}我的pid{os.getpid()},父进程:{os.getppid()}")
    time.sleep(1)


def study(lock):
    with lock:
print(f"我是子进程study,我的pid{os.getpid()},父进程:{os.getppid()}")
        time.sleep(1)

#如果是主进程
if __name__=='__main__':
print("我是主进程")
    lock=RLock()

    p1=Process(target=speak,args=(lock,))
    p2=Process(target=study,args=(lock,))
    p3=Process(target=speak1,name="speak",args=(666,999),kwargs={'msg':'msg'})

    p1.start()
    p1.terminate()
    p1.join(5)
print(p1.is_alive())
    p2.start()
    p2.join(5)
    p3.start()

守护进程

什么是守护进程?

一种依附于主进程存在的子进程,一旦主进程结束,自动终止

守护进程的使用场景:

  1. 后台监控类任务

  2. 日志 / 统计 / 采样 类任务

  3. 辅助型“陪跑任务”

注意点:

  1. 守护进程必须是 子进程。

  2. 主进程结束,守护进程也会随之结束。

  3. 守护进程中,不允许再创建新的子进程。

  4. 必须在 start 之前,start()之后,不能再设置daemon。

import os
import time
from multiprocessing import  Process,current_process,Lock,RLock


print(100,__name__,os.getpid())

def speak(lock):
    lock.acquire()
print(f"我是子进程speek,我的pid{os.getpid()},父进程:{os.getppid()}")
    lock.release()
    time.sleep(1)

def speak1(a,b,msg):
print(f"我是子进程speek1,{a},{b},{msg},{current_process().name}我的pid{os.getpid()},父进程:{os.getppid()}")
    time.sleep(1)


def study(lock):
    with lock:
print(f"我是子进程study,我的pid{os.getpid()},父进程:{os.getppid()}")
        time.sleep(1)

def monotor():
while True:
        try:
            with open('log.txt''r', encoding='utf-8') as file:
                lines = sum(1 for _ in file)
        except FileNotFoundError:
            lines = 0
print(f'我是【守护进程({os.getpid()})】,log.txt 共有{lines}行')
        time.sleep(1)

#如果是主进程
if __name__=='__main__':
print("我是主进程")
    lock=RLock()

    p1=Process(target=speak,args=(lock,))
    p2=Process(target=study,args=(lock,))
    p3=Process(target=speak1,name="speak",args=(666,999),kwargs={'msg':'msg'})
    p4=Process(target=monotor,daemon=True)


    p1.start()
    p1.terminate()
    p1.join(5)
print(p1.is_alive())
    p2.start()
    p2.join(5)
    p3.start()
    p4.start()


    with open('log.txt''a', encoding='utf-8') as file:
for index in range(10):
            file.write(f'1233{index}\n')
            file.flush()
            time.sleep(1)

进程之间不共享变量

进程之间不共享内存,也不共享变量

from multiprocessing import Process
num=100
names=[]

def test1():
    global num,names
    num+=10
    names.append("张三")
print(f"{num}")

def test2():
    global num,names
    num-=10
    names.append("张三1")
print(f"{num}")
print(f"{names}")

if __name__=="__main__":
    p1=Process(target=test1())
    p2=Process(target=test2())

    p1.start()
    p2.start()
    p1.join()
    p2.join()

队列Queue

1.一种先进先出的数据结构

import time
from multiprocessing import Queue,Process
#创建一个队列,不限制大小
q1=Queue()
#创建一个队列,最多保存3个元素
q2=Queue(4)
#put入队
q1.put(10)
q1.put(20)
q1.put(30)

print(q1)
#get 取数据
value1=q1.get()
value2=q1.get()
value3=q1.get()
print(value1)
print(value2)
print(value3)
#empty判断队列是否为空
result=q1.empty()

q1.put(100)
result1=q1.full()
print(result1)
result2=q1.qsize()
print(result2)
#队列满的时候,取出后才会添加元素
q2.put(1000)
q2.put(2000)
q2.put(3000)
q2.get()
q2.put(4000,timeout=3)
#向队列之间添加元素,不会进入等待模式,若队列已满,会抛出异常
q2.put_nowait(400)

print("放入完毕")
#队列空的时候,继续get会进入等待模式
q2.get()
#get_nowait直接读取队列种的元素
q2.get_nowait()

8.使用Queue实现进程通信

核心思想:一个进程负责生产数据,一个负责消费数据,中间Queue进行传话

import  time
from multiprocessing import Process,Queue

def test1(q):
for index in range(5):
print(f'{index}')
        q.put(index)
        time.sleep(0.5)

def test2(q):
for index in range(5):
        data=q.get()
print(f'{data}')
        time.sleep(1)

if __name__=="__main__":
    q=Queue()
    p1=Process(target=test1,args=(q,))
    p2=Process(target=test2,args=(q,))
    p1.start()
    p2.start()
    p1.join()
    p2.join()

本节终

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  1. CONNECT:[ UseTime:0.000522s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000614s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.032826s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.001620s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000698s ]
  6. SELECT * FROM `set` [ RunTime:0.000232s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000611s ]
  8. SELECT * FROM `article` WHERE `id` = 497806 LIMIT 1 [ RunTime:0.000485s ]
  9. UPDATE `article` SET `lasttime` = 1783022470 WHERE `id` = 497806 [ RunTime:0.012995s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000253s ]
  11. SELECT * FROM `article` WHERE `id` < 497806 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.006348s ]
  12. SELECT * FROM `article` WHERE `id` > 497806 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000456s ]
  13. SELECT * FROM `article` WHERE `id` < 497806 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000941s ]
  14. SELECT * FROM `article` WHERE `id` < 497806 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001177s ]
  15. SELECT * FROM `article` WHERE `id` < 497806 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000806s ]
0.144690s