c++多線程例（事件同步對象，變數共用）

1. //事件同步對象
2. #include <windows.h>
3. #include <iostream.h>
5. DWORD WINAPI Fun1Proc(LPVOID lpParameter);//thread data
6. DWORD WINAPI Fun2Proc(LPVOID lpParameter);//thread data
8. int tickets=100;//全域變數
9. HANDLE g_hEvent;//控制代碼
10. void main()
11. {
12. HANDLE hThread1;
13. HANDLE hThread2;
14. //建立人工同步對象
15. g_hEvent=CreateEvent(NULL,FALSE,FALSE,"tickets");
16. if (g_hEvent)//判斷是否建立成功
17. {
18. if (ERROR_ALREADY_EXISTS==GetLastError())
19. {
20. cout<<"only one instance can run!"<<endl;
21. return;
22. }
23. }
24. SetEvent(g_hEvent);//重點就是這個設定
26. //建立線程
27. hThread1=CreateThread(NULL,0,Fun1Proc,NULL,0,NULL);
28. hThread2=CreateThread(NULL,0,Fun2Proc,NULL,0,NULL);
29. CloseHandle(hThread1);
30. CloseHandle(hThread2);
32. //讓主線程睡眠4秒
33. Sleep(4000);
34. //關閉事件物件控點
35. CloseHandle(g_hEvent);
36. }
37. //線程1的入口函數
38. DWORD WINAPI Fun1Proc(LPVOID lpParameter)//thread data
39. {
40. while (true)
41. {
42. WaitForSingleObject(g_hEvent,INFINITE);
43. //ResetEvent(g_hEvent);
44. if (tickets>0)
45. {
46. Sleep(1);
47. cout<<"thread1 sell ticket :"<<tickets--<<endl;
48. SetEvent(g_hEvent);//重點就是這個設定
49. }
50. else
51. {
52. SetEvent(g_hEvent);//重點就是這個設定
53. break;
54. }
55. }
57. return 0;
58. }
59. //線程2的入口函數
60. DWORD WINAPI Fun2Proc(LPVOID lpParameter)//thread data
61. {
62. while (true)
63. {
64. //請求事件對象
65. WaitForSingleObject(g_hEvent,INFINITE);
66. //ResetEvent(g_hEvent);
67. if (tickets>0)
68. {
69. Sleep(1);
70. cout<<"thread2 sell ticket :"<<tickets--<<endl;
71. SetEvent(g_hEvent);//重點就是這個設定
72. }
73. else
74. {
75. SetEvent(g_hEvent);//重點就是這個設定
76. break;
77. }
78. }
80. return 0;
81. }