1 // SharedMemorySample_write_main.cpp

 2 #include <SDKDDKVer.h>

 3 #include <Windows.h>

 4 #include <stdio.h>

 5

 6 int main(int argc, char* argv[])

 7 {

 8     int        shmem_size = 16;  // 16byte

 9     HANDLE    shmem = INVALID_HANDLE_VALUE;

10     HANDLE    mutex = INVALID_HANDLE_VALUE;

11

12     mutex = ::CreateMutex(NULL, FALSE, "mutex_sample_name");

13

14     shmem = ::CreateFileMapping(

15         INVALID_HANDLE_VALUE,

16         NULL,

17         PAGE_READWRITE,

18         0,

19         shmem_size,

20         "shared_memory_name"

21         );

22

23     char *buf = (char*)::MapViewOfFile(shmem, FILE_MAP_ALL_ACCESS, 0, 0, shmem_size);

24

25

26     for (unsigned int c = 0; c < 60; ++c) {

27         // mutex lock

28         WaitForSingleObject(mutex, INFINITE);

29

30         // write shared memory

31         memset(buf, c, shmem_size);

32

33         printf("write shared memory...c=%d\n", c);

34

35         // mutex unlock

36         ::ReleaseMutex(mutex);

37

38         ::Sleep(1000);

39     }

40

41     // release

42     ::UnmapViewOfFile(buf);

43     ::CloseHandle(shmem);

44     ::ReleaseMutex(mutex);

45

46     return 0;

47 }

 1 // SharedMemorySample_read_main.cpp

 2 #include <SDKDDKVer.h>

 3 #include <Windows.h>

 4 #include <stdio.h>

 5

 6 int main(int argc, char* argv[])

 7 {

 8     int        shmem_size = 16;  // 16byte

 9     HANDLE    shmem = INVALID_HANDLE_VALUE;

10     HANDLE    mutex = INVALID_HANDLE_VALUE;

11

12     mutex = ::CreateMutex(NULL, FALSE, "mutex_sample_name");

13

14     shmem = ::CreateFileMapping(

15         INVALID_HANDLE_VALUE,

16         NULL,

17         PAGE_READWRITE,

18         0,

19         shmem_size,

20         "shared_memory_name"

21         );

22

23     char *buf = (char*)::MapViewOfFile(shmem, FILE_MAP_ALL_ACCESS, 0, 0, shmem_size);

24

25

26     for (unsigned int c = 0; c < 60; ++c) {

27         // mutex lock

28         WaitForSingleObject(mutex, INFINITE);

29

30         printf("read shared memory...c=%d\n", buf[0]);

31

32         // mutex unlock

33         ::ReleaseMutex(mutex);

34

35         ::Sleep(1000);

36     }

37

38     // release

39     ::UnmapViewOfFile(buf);

40     ::CloseHandle(shmem);

41     ::ReleaseMutex(mutex);

42

43     return 0;

44 }