- 1 year ago
How to lock a semaphore with multiple count
To lock a semaphore with multiple counts, you can use the WaitForMultipleObjects
function in the Windows API. This function allows you to wait for multiple synchronization objects, including semaphores, and provides options for synchronization.
Here's an example of how you can lock a semaphore with multiple counts using WaitForMultipleObjects
in C++:
cpp#include <Windows.h>
int main()
{
HANDLE semaphore = CreateSemaphore(NULL, 2, 2, NULL); // Create a semaphore with 2 initial counts
if (semaphore == NULL)
{
// Handle error
return 1;
}
DWORD result = WaitForSingleObject(semaphore, INFINITE); // Wait for the semaphore
if (result != WAIT_OBJECT_0)
{
// Handle error
CloseHandle(semaphore);
return 1;
}
// The semaphore is locked with multiple counts
// Do some work here...
ReleaseSemaphore(semaphore, 1, NULL); // Release one count from the semaphore
// Continue with other work...
CloseHandle(semaphore); // Close the semaphore handle
return 0;
}
In the above example, the CreateSemaphore
function is used to create a semaphore with an initial count of 2. The WaitForSingleObject
function is then used to wait for the semaphore. Once the semaphore is acquired, you can perform the desired work. After completing the work, the ReleaseSemaphore
function is used to release one count from the semaphore.
Note that the example shows a single semaphore with multiple counts, but you can create and work with multiple semaphores as needed.