I've tested an example from: http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpguide/html/cpconmutex.asp
And it doesn't work correctly with Mono. It uses 2 mutex no control 4 threads, lets see each one: t1Start: Waits to finish until all mutex are released t2Start: Waits until mutex 1 is released t3Start: Waits until any mutex is released (1 or 2) t4Start: Waits until mutex 2 is released The program launch the 4 threads and Release mutex 1 and then mutex 2. The output of the program shows: MutexSample.cs ... - Main Owns gM1 and gM2 t1Start started, Mutex.WaitAll(Mutex[]) t2Start started, gM1.WaitOne( ) t3Start started, Mutex.WaitAny(Mutex[]) t4Start started, gM2.WaitOne( ) - Main releases gM1 t2Start finished, gM1.WaitOne( ) - Main releases gM2 t4Start finished, gM2.WaitOne( ) And the program doesn't finish. As we can see only the threads t2 and t4 have finished, so the calls WaitAll and WaitAny of thread t1 and t3 don't work properly. The code is attached. Is it a bug? -- [aka Marble] Registered LiNUX user #140941 <> http://counter.li.org/ Socio #3274 de HispaLinux <> http://www.hispalinux.es Miembro de GPL URV <> http://www.gplurv.org GnuPG key: 0x0ED2CF9D <> pgp.escomposlinux.org
using System;
using System.Threading;
public class MutexSample{
static Mutex gM1;
static Mutex gM2;
const int ITERS = 100;
static AutoResetEvent Event1 = new AutoResetEvent(false);
static AutoResetEvent Event2 = new AutoResetEvent(false);
static AutoResetEvent Event3 = new AutoResetEvent(false);
static AutoResetEvent Event4 = new AutoResetEvent(false);
public static void Main(String[] args){
Console.WriteLine("MutexSample.cs ...");
gM1 = new Mutex(true,"MyMutex");
// Create Mutext initialOwned, with name of "MyMutex".
gM2 = new Mutex(true);
// Create Mutext initialOwned, with no name.
Console.WriteLine(" - Main Owns gM1 and gM2");
AutoResetEvent[] evs = new AutoResetEvent[4];
evs[0] = Event1;
// Event for t1.
evs[1] = Event2;
// Event for t2.
evs[2] = Event3;
// Event for t3.
evs[3] = Event4;
// Event for t4.
MutexSample tm = new MutexSample( );
Thread t1 = new Thread(new ThreadStart(tm.t1Start));
Thread t2 = new Thread(new ThreadStart(tm.t2Start));
Thread t3 = new Thread(new ThreadStart(tm.t3Start));
Thread t4 = new Thread(new ThreadStart(tm.t4Start));
t1.Start();
// Calls Mutex.WaitAll(Mutex[] of gM1 and gM2).
t2.Start();
// Calls Mutex.WaitOne(Mutex gM1).
t3.Start();
// Calls Mutex.WaitAny(Mutex[] of gM1 and gM2).
t4.Start();
// Calls Mutex.WaitOne(Mutex gM2).
Thread.Sleep(2000);
Console.WriteLine(" - Main releases gM1");
gM1.ReleaseMutex( );
// t2 and t3 will end and signal.
Thread.Sleep(1000);
Console.WriteLine(" - Main releases gM2");
gM2.ReleaseMutex( );
// t1 and t4 will end and signal.
WaitHandle.WaitAll(evs);
// Waiting until all four threads signal that they are done.
Console.WriteLine("... MutexSample.cs");
}
public void t1Start(){
Console.WriteLine("t1Start started, Mutex.WaitAll(Mutex[])");
Mutex[] gMs = new Mutex[2];
gMs[0] = gM1;
// Create and load an array of Mutex objects for WaitAll call.
gMs[1] = gM2;
Mutex.WaitAll(gMs);
// Waits until both Mutex objects are released.
Thread.Sleep(2000);
Console.WriteLine("t1Start finished, Mutex.WaitAll(Mutex[])");
Event1.Set( );
// AutoResetEvent.Set( ) flagging method is done.
}
public void t2Start(){
Console.WriteLine("t2Start started, gM1.WaitOne( )");
gM1.WaitOne( );
// Waits until Mutex gM1 is released.
Console.WriteLine("t2Start finished, gM1.WaitOne( )");
Event2.Set( );
// AutoResetEvent.Set( ) flagging method is done.
}
public void t3Start(){
Console.WriteLine("t3Start started, Mutex.WaitAny(Mutex[])");
Mutex[] gMs = new Mutex[2];
gMs[0] = gM1;
// Create and load an array of Mutex objects for WaitAny call.
gMs[1] = gM2;
Mutex.WaitAny(gMs);
// Waits until either Mutex object is released.
Console.WriteLine("t3Start finished, Mutex.WaitAny(Mutex[])");
Event3.Set( );
// AutoResetEvent.Set( ) flagging method is done.
}
public void t4Start(){
Console.WriteLine("t4Start started, gM2.WaitOne( )");
gM2.WaitOne( );
// Waits until Mutex gM2 is released.
Console.WriteLine("t4Start finished, gM2.WaitOne( )");
Event4.Set( );
// AutoResetEvent.Set( ) flagging method is done.
}
}
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