C ++ multi-thread example (event synchronization object, variable sharing)

1. // Event synchronization object
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; // global variable
9. Handle g_hevent; // handle
10. Void main ()
11. {
12. Handle hthread1;
13. Handle hthread2;
14. // Create a synchronization object
15. G_hevent = createevent (null, false, false, "tickets ");
16. If (g_hevent) // determine whether the creation is successful
17. {
18. If (error_already_exists = getlasterror ())
19. {
20. Cout <"only one instance can run! "<Endl;
21. Return;
22. }
23. }
24. Setevent (g_hevent); // This setting is important.
26. // Create a thread
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. // Sleep the main thread for 4 seconds
33. Sleep (4000 );
34. // Close the event object handle
35. Closehandle (g_hevent );
36. }
37. // Entry function of thread 1
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 extends Ticket:" <tickets -- <Endl;
48. Setevent (g_hevent); // This setting is important.
49. }
50. Else
51. {
52. Setevent (g_hevent); // This setting is important.
53. Break;
54. }
55. }
57. Return 0;
58. }
59. // Entry function of thread 2
60. DWORD winapi fun2proc (lpvoid lpparameter) // thread data
61. {
62. While (true)
63. {
64. // Request event object
65. Waitforsingleobject (g_hevent, infinite );
66. // Resetevent (g_hevent );
67. If (tickets> 0)
68. {
69. Sleep (1 );
70. Cout <"thread2 extends Ticket:" <tickets -- <Endl;
71. Setevent (g_hevent); // This setting is important.
72. }
73. Else
74. {
75. Setevent (g_hevent); // This setting is important.
76. Break;
77. }
78. }
80. Return 0;
81. }