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                            #### ?4.死鎖的必要條件
互斥條件：同一資源同時只能由一個線程讀取
不可搶占條件：不能強行剝奪線程占有的資源
請求和保持條件：請求其他資源的同時對自己手中的資源保持不放
循環等待條件：在相互等待資源的過程中，形成一個閉環
想要預防死鎖，只需要破壞其中一個條件即可，比如使用定時鎖、盡量讓線程用相同的加鎖順序，還可以用銀行家算法可以預防死鎖
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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