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  1. #include <thread>
  2. #include <iostream>
  3. #include <vector>
  4. #include <mutex>
  5. #include <list>
  6.  
  7. class Hello
  8. {
  9. 	int i_;
  10. 	static std::mutex mu_;
  11. public:
  12. 	Hello()
  13. 	{
  14. 		std::lock_guard<std::mutex> lock(mu_);
  15. 		i_ = 0;
  16. 	}
  17.  
  18. 	~Hello()
  19. 	{
  20. 	}
  21.  
  22. 	void say_hello()
  23. 	{
  24. 		std::lock_guard<std::mutex> lock(mu_);
  25. 		std::cout << "say_hello from thread " << ++i_ << " " << this << " " << std::this_thread::get_id() << std::endl;
  26. 	}
  27. };
  28.  
  29. std::mutex Hello::mu_;
  30.  
  31. void hellos_in_threads_stack()
  32. {
  33. 	std::vector<std::thread> threads;
  34. 	for (int i = 0; i < 4; ++i)
  35. 	{
  36. 		threads.emplace_back([]() {
  37. 			Hello h;
  38. 			h.say_hello();
  39. 		});
  40. 	}
  41.  
  42. 	for (auto& thread : threads) {
  43. 		thread.join();
  44. 	}
  45. }
  46.  
  47.  
  48. void hellos_in_list()
  49. {
  50. 	std::vector<std::thread> threads;
  51. 	std::list<Hello> hellos;
  52. 	for (int i = 0; i < 4; ++i)
  53. 	{
  54. 		hellos.emplace_back();
  55. 		threads.emplace_back(&Hello::say_hello, &hellos.back());
  56. 	}
  57.  
  58. 	for (auto& thread : threads) {
  59. 		thread.join();
  60. 	}
  61. }
  62.  
  63. int main()
  64. {
  65. 	hellos_in_threads_stack();
  66. 	hellos_in_list();
  67. }
Success #stdin #stdout 0s 4560KB
comments (?)
stdin 
Standard input is empty
stdout 
say_hello from thread 1 0x2b091e654ed0 47318164657920
say_hello from thread 1 0x2b091e453ed0 47318162556672
say_hello from thread 1 0x2b091e252ed0 47318160455424
say_hello from thread 1 0x2b091e051ed0 47318158354176
say_hello from thread 1 0x5641fa338da0 47318158354176
say_hello from thread 1 0x5641fa338dc0 47318160455424
say_hello from thread 1 0x5641fa338c30 47318162556672
say_hello from thread 1 0x5641fa338c50 47318164657920
https://ideone.com/F7STsf
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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