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Doing more work in Main()! Doing more work in Main()! Doing more work in Main()! Doing more work in Main()! Doing more work in Main()! 10 + 10 is 20 In addition to the IsCompleted property, the IAsyncResult interface provides the AsyncWaitHandle property for more flexible waiting logic This property returns an instance of the WaitHandle type, which exposes a method named WaitOne() The benefit of WaitHandleWaitOne() is that you can specify the maximum wait time If the specified amount of time is exceeded, WaitOne() returns false Ponder the following updated while loop, which no longer makes use of a call to ThreadSleep(): while (!iftARAsyncWaitHandleWaitOne(1000, true)) { ConsoleWriteLine("Doing more work in Main()!"); } While these properties of IAsyncResult do provide a way to synchronize the calling thread, they are not the most efficient approach.

In many ways, the IsCompleted property is much like a really annoying manager (or classmate) who is constantly asking, Are you done yet Thankfully, delegates provide a number of additional (and more elegant) techniques to obtain the result of a method that has been called asynchronously..

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Note If you happen to have a background in COM development, note that .NET objects do not maintain an internal reference counter, and therefore managed objects do not expose methods such as AddRef() or Release().

When the C# compiler encounters the new keyword, it emits a CIL newobj instruction into the method implementation If you compile the current example code and investigate the resulting assembly using ildasmexe, you d find the following CIL statements within the MakeACar() method: method private hidebysig static void MakeACar() cil managed { // Code size 8 (0x8) maxstack 1 locals init ([0] class SimpleGCCar myCar) IL_0000: nop IL_0001: newobj instance void SimpleGCCar::ctor() IL_0006: stloc0 IL_0007: ret } // end of method Program::MakeACar Before we examine the exact rules that determine when an object is removed from the managed heap, let s check out the role of the CIL newobj instruction in a bit more detail First, understand that the managed heap is more than just a random chunk of memory accessed by the CLR The .

The {taxonomy_vocabulary}.vid of the vocabulary to which the term is assigned The term name A description of the term

NET garbage collector is quite a tidy housekeeper of the heap, given that it will compact empty blocks of memory (when necessary) for purposes of optimization To aid in this endeavor, the managed heap maintains a pointer (commonly referred to as the next object pointer or new object pointer) that identifies exactly where the next object will be located That said, the newobj instruction tells the CLR to perform the following core operations: Calculate the total amount of memory required for the object to be allocated (including the memory required by the data members and the base classes) Examine the managed heap to ensure that there is indeed enough room to host the object to be allocated.

If there is, the specified constructor is called and the caller is ultimately returned a reference to the new object in memory, whose address just happens to be identical to the last position of the next object pointer Finally, before returning the reference to the caller, advance the next object pointer to point to the next available slot on the managed heap..

The taxonomy_term_hierarchy table stores the hierarchical relationship between terms. Table A-94. taxonomy_term_hierarchy (taxonomy module)

The basic process is illustrated in Figure 8-2.

Figure 8-2. The details of allocating objects onto the managed heap As your application is busy allocating objects, the space on the managed heap may eventually become full. When processing the newobj instruction, if the CLR determines that the managed heap does not have sufficient memory to allocate the requested type, it will perform a garbage collection in an attempt to free up memory. Thus, the next rule of garbage collection is also quite simple:

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Rule If the managed heap does not have sufficient memory to allocate a requested object, a garbage collection will occur.

Exactly how this garbage collection occurs, however, depends on which version of the .NET platform your application is running under. You ll look at the differences a bit later in this chapter.