glib2线程池无法动态控制线程数

lysddp

我想先创建一个最大可达30个线程的线程池，然后将每个线程的闲置时间最大设成5秒，超过5秒则自动关闭空闲线程。可是现在我先创建一个30个线程的线程池，然后什么也不做，打印出来的空闲线程还是0个呢？？

1. #include <stdio.h>
   
2. #include <glib.h>
   
3. #include <pthread.h>
   
4. #include <string.h>
   
5. 
   
6. #define MAX_THREAD_NUM 30
   
7. 
   
8. 
   
9. /** 全局锁*/
   
10. pthread_mutex_t g_lock;
    
11. 
    
12. /**
    
13. * @brief 线程池回调函数，线程执行的主体函数
    
14. */
    
15. void
    
16. show_result(gpointer str, gpointer data)
    
17. {
    
18. 
    
19.   pthread_mutex_lock(&g_lock);
    
20.   printf("The result is : %s\n", (char *)str);
    
21. 
    
22. 
    
23.   pthread_mutex_unlock(&g_lock);
    
24. }
    
25. 
    
26. 
    
27. void
    
28. main()
    
29. {
    
30.   char *str = "thread_pool example";
    
31.   int count = 0;
    
32.   int g_thread_num = 0;
    
33.   GThreadPool *thread_pool;
    
34.   int unused=-1;
    
35.   int nownum=-1;
    
36.   int maxidle=-1;
    
37.   int maxunused=-1;
    
38. /**
    
39. 
    
40.    * 初始化互斥锁，NULL表示使用默认的快速互斥锁。
    
41. 
    
42.    */
    
43.   pthread_mutex_init(&g_lock, NULL);
    
44. 
    
45.   g_thread_init(NULL);
    
46. 
    
47.   thread_pool = g_thread_pool_new(show_result, NULL, MAX_THREAD_NUM, TRUE, NULL);
    
48. 
    
49. g_thread_pool_set_max_idle_time(0);
    
50.    g_thread_pool_set_max_unused_threads(1);
    
51. 
    
52. 
    
53.   if (thread_pool == NULL)
    
54.   {
    
55.     printf("g_thread_pool_new failed!\n");
    
56.     return ;
    
57.   }
    
58.   /**
    
59.    * 调用20次线程池
    
60.    * 实际线程池中最多有10个线程同时运行
    
61.    */
    
62. 
    
63.   /*
    
64.   for (count; count < 10; count++)
    
65.   {
    
66.     g_thread_pool_push(thread_pool, (gpointer)str, NULL);
    
67.   }
    
68.   */
    
69. 
    
70.   sleep(20);
    
71.   g_thread_num =  g_thread_pool_get_max_threads(thread_pool);
    
72. 
    
73.   unused= g_thread_pool_get_num_unused_threads();
    
74. 
    
75.   printf("Max number in the pthread pool: %d\n", g_thread_num);
    
76.   printf("unused thread:%d\n",unused);
    
77. 
    
78. 
    
79. 
    
80. 
    
81.   nownum=g_thread_pool_get_num_threads(thread_pool);
    
82.   printf("now num of thread in pool:%d\n",nownum);
    
83. 
    
84.   maxidle=g_thread_pool_get_max_idle_time();
    
85. 
    
86.   printf("max idle time:%d\n",maxidle);
    
87. 
    
88. 
    
89.   maxunused= g_thread_pool_get_max_unused_threads();
    
90.   printf("max unused thread:%d\n",maxunused);
    
91. 
    
92. 
    
93. //  g_thread_pool_free(thread_pool, 0, 1);
    
94. 
    
95.   return;
    
96. }
    
97. 
    
98. 
    

复制代码

打印结果是：
Max number in the pthread pool: 30
unused thread:0
now num of thread in pool:30
max idle time:0
max unused thread:1

这是为什么呢，麻烦懂的吼一下啊，谢谢了。