python-gevent模块（自动切换io的协程）

时间 2019-11-13
原文原文链接
 
        import  
        gevent 
       
        def  
        foo(): 
       
        print 
        ( 
        "Running in foo" 
        ) 
       
        gevent.sleep( 
        2 
        ) 
       
        print 
        ( 
        "Explicit context switch to foo again" 
        ) 
       
        def  
        bar(): 
       
        print 
        ( 
        "Explicit context to bar" 
        ) 
       
        gevent.sleep( 
        1  
        ) 
       
        print 
        ( 
        "Implicit context switch back to bar" 
        ) 
       
        def  
        func3(): 
       
        print 
        ( 
        "running func3" 
        ) 
       
        gevent.sleep( 
        0 
        ) 
        #遇到io就切换，sleep最长2秒，因此整个程序花费两秒，若是是串行须要花费3秒 
       
        print 
        ( 
        "running func3 again" 
        ) 
       
        gevent.joinall([ 
       
        gevent.spawn(foo), 
        #启动一个协程 
       
        gevent.spawn(bar), 
       
        gevent.spawn(func3) 
       
        ] 
       
        )