Using Waitable Timer Objects

The following example creates a timer that will be signaled after a 10 second delay. First, the code uses the CreateWaitableTimer function to create a waitable timer object. Then it uses the SetWaitableTimer function to set the timer. The code uses the WaitForSingleObject function to determine when the timer has been signaled.

#include <windows.h>
#include <stdio.h>

int main()
{
 HANDLE hTimer = NULL;
 LARGE_INTEGER liDueTime;

 liDueTime.QuadPart = -100000000LL;

 // Create an unnamed waitable timer.
 hTimer = CreateWaitableTimer(NULL, TRUE, NULL);
 if (NULL == hTimer)
 {
 printf("CreateWaitableTimer failed (%d)\n", GetLastError());
 return 1;
 }

 printf("Waiting for 10 seconds...\n");

 // Set a timer to wait for 10 seconds.
 if (!SetWaitableTimer(hTimer, &liDueTime, 0, NULL, NULL, 0))
 {
 printf("SetWaitableTimer failed (%d)\n", GetLastError());
 return 2;
 }

 // Wait for the timer.

 if (WaitForSingleObject(hTimer, INFINITE) != WAIT_OBJECT_0)
 printf("WaitForSingleObject failed (%d)\n", GetLastError());
 else printf("Timer was signaled.\n");

 return 0;
}

Related topics

Using Waitable Timers with an Asynchronous Procedure Call