A Device Driver for W2K Signals

Listing 2: testapp.c — Source for signal demonstration program

#define STRICT 1
#include <windows.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>

#include "..\dll\signals.h"

/* Global variables to avoid any optimization by the compiler */
long sum1 = 0, sum2 = 0;

volatile unsigned long WaitFlag = 0;

VOID __stdcall fSignal0(VOID)
{
   printf("Thread (%ld):Inside the handler \
of signal SIGNAL0!!!\n", GetCurrentThreadId());
   return;
}

DWORD WINAPI ThreadRoutine(LPVOID Param)
{
   long i;

   /* Set a hanndler for SIGNAL0 */
   SetSignalHandler(SIGNAL0, fSignal0);

   /* Do some stuff.... */
   for (i = 0; i < 10000000; i++)  sum1++;

   /* Wait until the main thread sets the flag */
   while (WaitFlag == 0);
   return 0;
}

HANDLE hThread;
DWORD ThreadId;

int main()
{
   ULONG   i = 0;
   DWORD   Data = 1;   /* Not actually used */

   /* Create the target thread */
   hThread = CreateThread(NULL,0,ThreadRoutine,&Data,0,&ThreadId);

   /* Let the target thread to run for a while */
   Sleep(1000);

   /* Send a signal to the target thread */
   printf("Thread (%ld): Sends a signal to the \
target thread\n", GetCurrentThreadId());
   SendSignalToThread(hThread, SIGNAL0);

   /* Do some stuff and wait for a while */
   for (i = 0; i < 10000000; i++)  sum2++;
   Sleep(1000); 

   /* Set the flag. The handler must have been executed by now */
   WaitFlag = 1;

   /* Wait for the thread's termination */
   WaitForSingleObject(hThread, INFINITE);

   return 0;
}
/* End of File */