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void main() { Process^ proc1 = gcnew Process(); proc1->StartInfo->FileName = "../debug/SyncByMutex.exe"; proc1->StartInfo->Arguments = "1"; proc1->StartInfo->UseShellExecute = false; proc1->StartInfo->RedirectStandardInput = true; proc1->Start(); Process^ proc2 = gcnew Process(); proc2->StartInfo->FileName = "../debug/SyncByMutex.exe"; proc2->StartInfo->Arguments = "2"; proc2->StartInfo->UseShellExecute = false; proc2->StartInfo->RedirectStandardInput = true; proc2->Start(); Thread::Sleep(5000); } You don t need to use MutexSpawn.exe to run the following Mutex example, but it makes things easier when you re trying to test multiple processes running at the same time. Let s move on to actually looking at the Mutex class. In general, you ll use only three methods on a regular basis within the Mutex class: The constructor WaitOne() ReleaseMutex() // Added just to clean up console display

Figure 11-5. The Class Details window The title of this window indicates which class you re viewing. All of the methods, properties, fields, and events of a class are listed in this window. The top icon on the left side of this window gives you the option of entering any new item for the class. The four icons below that are used to navigate to different sections of the Class Details window.

Unlike the Monitor class, in which you use a static member, the Mutex class requires you to create an instance and then access its member methods. Like any other class, creating an instance of Mutex requires that you call its constructor. The Mutex constructor provides five overloads: Mutex(); Mutex(Boolean Mutex(Boolean Mutex(Boolean Mutex(Boolean owner); owner, String^ name); owner, String^ name, &Boolean createdNew); owner, String^ name, &Boolean createdNew, MutexSecurity^ mutexSecurity);

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When you create the Mutex object, you specify whether you want it to have ownership of the Mutex or, in other words, block the other threads trying to enter the region Be careful, though, that the constructor doesn t cause a thread to block This requires the use of the WaitOne() method, which you ll see later in the chapter You can create either a named or unnamed instance of a Mutex object, but to share a Mutex across processes, you need to give it a name When you provide a Mutex with a name, the Mutex constructor will look for another Mutex with the same name If it does find one, they will synchronize blocks of code together.

Follow up by switching over to DudelViewController.m to synthesize the currentPopover property, and clean it up in the dealloc method.

The layout will vary depending on the type of object selected on the design surface. The Class Details window for a class includes the Type column, which provides IntelliSense functionality as you enter the member types; the Modifier column, which is a drop-down list of scope options; and the Summary column. To add a summary, click the ellipsis in the Summary column to open the Description dialog box, as shown in Figure 11-6.

The third constructor adds an output parameter that will have a value of true if this call was the first constructor to build a Mutex of the specified name; otherwise, the name already exists and will have the value of false The last constructor adds access control security to be applied to the named Mutex This form of the constructor is beyond the scope of this book, but basically it allows the addition of access right rules to the named Mutex Once a Mutex object exists, you must tell it to wait for the region to be unoccupied before entering.

You do this using the Mutex class s WaitOne() member method: bool WaitOne(); bool WaitOne(int milliseconds, bool exitContext); bool WaitOne(TimeSpan span, bool exitContext); The WaitOne() method is similar to a combination of the Monitor class s Enter() and TryEnter() methods, in that the WaitOne() method will wait indefinitely like the Monitor::Enter() method if you pass it no parameters If you pass it parameters, though, it blocks for the specified time and then passes through like the Monitor::TryEnter() method As with the TryEnter() method, you should not, normally, let the thread execute the code within the Mutex region, as that will make the region not thread-safe..

By placing a using statement (or an Imports statement in VB) at the top of the code module, you Tip

The exitContext parameter you will probably ignore and set to false, as it is an advanced feature of Mutex where the WaitOne() method is called from inside a nondefault managed context. This can happen if your thread is inside a call to an instance of a class derived from ContextBoundObject. (Probably something that you won t do unless you are performing some rather advanced C++/CLI coding.)

@synthesize currentTool, fillColor, strokeColor, font, strokeWidth, currentPopover; - (void)dealloc { self.currentTool = nil; self.fillColor = nil; self.strokeColor = nil; self.currentPopover = nil; [super dealloc]; }

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