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QuestionAccessing and displaying semaphore count Pin
coco24322-May-22 1:42
Membercoco24322-May-22 1:42 
Hi,

In my trying on understanding semaphores I am looking on the following example:

C++
DWORD WINAPI ChildThreadProc( HWND hWnd )
{
	TCHAR szBuffer[256];          // buffer
	DWORD dwSemCount = 0;         // printing semaphore count
	HANDLE hSemaphore = OpenSemaphore( SYNCHRONIZE, FALSE, "TEST SEMAPHORE");
	wsprintf(szBuffer, "Thread %x waiting for semaphore %x", GetCurrentThreadId(), hSemaphore );
	SendMessage(hWnd, WM_USER, 0, (LPARAM)szBuffer);
	// Check for signaled semaphore
	WaitForSingleObject( hSemaphore, INFINITE );
	wsprintf(szBuffer, "Thread %x got semaphore", GetCurrentThreadId() );
	SendMessage(hWnd, WM_USER, 0, (LPARAM)szBuffer);
	Sleep(5000);
	//dwSCount = dwSemCount;
	//Release semaphore
	ReleaseSemaphore( hSemaphore, 1, (LPLONG)&dwSCount );
	wsprintf( szBuffer, "Thread %x is done with semaphore. Its count was %ld.", GetCurrentThreadId(), dwSemCount );
	SendMessage( hWnd, WM_USER, 0, (LPARAM)szBuffer );
	CloseHandle( hSemaphore );
	ExitThread ( TRUE );
}


And I am having 2 problems here:

-first, the dwSemCount value si always printed as 0, even if the semaphore works fine
-second, incrementing the counter with ReleaseSemaphore function from inside of thread doesn't working, I can't explain why.

Can you please help me with some advices?

Thank you very much,
AnswerRe: Accessing and displaying semaphore count Pin
Mircea Neacsu22-May-22 2:02
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