python多线程学习笔记(超详细)

python

threading

多线程

一. Threading简介

首先看下面的没有用Threading的程序

1. ---

2. ): 
   

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3. s += i 
   

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4. time.sleep( 
   

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5. ---

6. ---

7. ): 
   

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8. s += i 
   

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9. time.sleep()] 
   

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10. ---

11. ---

12. ): 
    

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13. print() 
    

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14. ): 
    

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15. print( 
    

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16. threading:  
    

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17. threading:  
    

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18. 主线程等待t这个线程 
    

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19. threading:  
    

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20. Main:  
    

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21. threading:  
    

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22. Main:  
    

    ---

23. threading:  
    

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24. Main:  
    

    ---

25. threading:  
    

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26. Main:  
    

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27. threading:  
    

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28. Main:  
    

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29. threading:  
    

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30. Main:  
    

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31. threading:  
    

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32. Main:  
    

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33. Main:  
    

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34. Main:  
    

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35. [Finished ) 
    

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36. print() 
    

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37. print(  
    

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38. lock = threading.Lock() ): 
    

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39. lock.acquire() 
    

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40. print(share) 
    

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41. share += self.i 
    

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42. time.sleep(random.random()) 
    

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43. print() 
    

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44. tt = MyThread() 
    

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45. t.start() 
    

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46. tt.start() 
    

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47. ---

48. >>> 
    

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49. ---

50. + =  
    

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51. ---

52. + =  
    

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53. ---

54. + =  
    

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55. ---

56. + =  
    

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57. [Finished ):  
    

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58. ---

59. ---

60. + =  
    

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61. ---

62. + =  
    

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63. ---

64. + =  
    

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65. + =  
    

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66. [Finished  
    

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67. ---

68. share_cond = threading.Condition() 
    

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69. ---

70. ---

71. print(self.name,share) 
    

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72. share_cond.notify() ) 
    

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73. ---

74. ) 
    

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75. ---

76. ---

77. Custom  
    

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78. Produce  
    

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79. Custom  
    

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80. Produce  
    

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81. Custom  
    

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82. ... 
    

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83. ... 
    

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84. ... 
    

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上面的结果会一直重复执行下去

3 ) 信号量threading.Semaphore

属性

• 实例化时，指定使用量。

• 其内置计数器，锁定时+1，
  释放时－1，计数器为0则阻塞。

• acquire(blocking=True,timeout=None)

• release()释放锁。

1. ) 
   

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2. ---

3. ) 
   

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4. sema.release() 
   

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5. print(self.name,)] 
   

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6. Sema Had got resource. 
   

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7. Sema Had got resource. 
   

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8. Sema Had got resource. 
   

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9. Sema Had released resource. 
   

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10. Sema Had got resource. 
    

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11. Sema Had released resource. 
    

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12. Sema Had released resource. 
    

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13. Sema Had got resource. 
    

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14. Sema Had released resource. 
    

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15. Sema Had released resource. 
    

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16. [Finished ) 
    

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17. print('Main thread set event flag!') 
    

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18. event.set() 
    

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19. ---

20. if __name__ == '__main__': 
    

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21. thw = MyThreadWait() 
    

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22. thm = MyThreadMain() 
    

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23. thw.start() 
    

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24. thm.start() 
    

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25. ---

26. >>> 
    

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27. Wait Thread Wait... 
    

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28. Main thread set event flag! 
    

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29. Wait Thread Start... 
    

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30. [Finished in 3.6s] 
    

    ---

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