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waitforsingleobject (kernel32)
 
.
Summary

C# Signature:

[DllImport("kernel32.dll", SetLastError=true)]
  static extern UInt32 WaitForSingleObject(IntPtr hHandle, UInt32 dwMilliseconds);

VB.NET Signature:

<DllImport("kernel32", SetLastError := True)> _
  Function WaitForSingleObject( _
    ByVal handle As IntPtr, _
    ByVal milliseconds As UInt32) As UInt32
  End Function

Boo Signature:

[DllImport("kernel32.dll", SetLastError : true)]
static def WaitForSingleObject(hHandle as IntPtr, dwMilliseconds as uint) as uint:
     pass

User-Defined Types:

None.

Notes:

None.

Tips & Tricks:

C#

  const UInt32 INFINITE = 0xFFFFFFFF;
  const UInt32 WAIT_ABANDONED = 0x00000080;
  const UInt32 WAIT_OBJECT_0 = 0x00000000;
  const UInt32 WAIT_TIMEOUT = 0x00000102;

  and use:

  WaitForSingleObject(handle, (int)INFINITE);

VB.NET

  Const INFINITE As UInt32 = &HFFFFFFFFUI
  Const WAIT_ABANDONED As UInt32 = &H80UI
  Const WAIT_OBJECT_0 As UInt32 = &H0UI
  Const WAIT_TIMEOUT As UInt32 = &H102UI

  and use:

  WaitForSingleObject(handle, INFINITE)

Sample Code:

private void Run()
{
  while (bRunning)
  {
   try
    {
     if(WaitForSingleObject(ReceivedEvent,INFINITE) == WAIT_OBJECT_0)
     {
      // Signaled            
      DoSomething();
     }
    }

    catch(Exception Ex)
    {
     // An exception occurred
     //
     trhow(Ex);
    }
   }
}

UInt32 waitFor;
waitFor = WaitForSingleObject(hMutex, 10000);
if (waitFor == WAIT_TIMEOUT)
     throw new ....
else if (waitFor == WAIT_ABANDONED)
{
     ReleaseMutex(waitFor);
     throw new ....
}
if (waitFor != WAIT_OBJECT_0)
{
     throw new Win32Exception("Synchronization Mutex Error.");
}
return 0;

Alternative Managed API:

If you have a System.Diagnostic.Process object (possibly created by Process.Start), call Process.WaitForExit().

If you're waiting on a file system object, look at System.IO.FileSystemWatcher

System.Threading.WaitHandle and derivatives (e.g. AutoResetEvent)

System.Threading.Timeout.Infinite

Documentation

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