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This method is thread safe even though it doesn t take any lock Since Int32 is a value type, the two Int32 values passed to Max are copied into it and multiple threads could be calling Max simultaneously, but each thread is working on its own data, isolated from any other thread On the other hand, the FCL does not guarantee that instance methods are thread safe because adding all the locking code would hurt performance too much And, in fact, if every instance method acquires and releases a lock, then you ultimately end up having just one thread running in your application at any given time, which hurts performance even more As mentioned earlier, when a thread constructs an object, only this thread has a reference to the object, no other thread can access that object, and no thread synchronization is required when invoking instance methods .

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However, if the thread then exposes the reference to the object by placing it in a static field, passing as the state argument to ThreadPool QueueUserWorkItem or to a Task, and so on then thread synchronization is required if the threads could attempt simultaneous non read-only access It is recommended that your own class libraries follow this pattern; that is, make all your static methods thread safe and make all your instance methods not thread-safe There is one caveat to this pattern: if the purpose of the instance method is to coordinate threads, then the instance method should be thread safe For example, one thread can cancel an operation by calling CancellationTokenSource s Cancel method, and another thread detects that it should stop what it s doing by querying the corresponding CancellationToken s IsCancellationRequested property .

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Gets or sets a bool value indicating whether the parameter accepts null values; the default value is false. ParameterName Gets or sets a String value representing the name of the parameter; the default is an empty string. Gets or sets the maximum number of digits used to represent numeric Value Precision properties; the default value is 0 (zero). Gets or sets the number of decimal places that should be used for numeric Scale Value properties; the default value is 0 (zero). Gets or sets the maximum size in bytes of the data within the parameter. Size Gets or sets the value of the parameter. This property accepts a Value System.Object instance that the implementation will attempt to convert to the appropriate data source type when used. See DbType, SqlDbType, and OleDbType for details. IsNullable The DBDemo.SetAge method demonstrates the creation and configuration of an UPDATE command that uses parameters to change the age of a specified person:

255 255 255 0 # of hosts per subnet = 28 - 2

Figure 2-11

These two instance members have some special thread synchronization code inside them to ensure that the coordination of the two threads goes as expected 1.

To determine the number of subnets available within an address space, simply calcu late the value of 2y, where y equals the number of bits in the subnet ID. For example, when the network address space 172.16.0.0/16 is subnetted to /24, 8 bits are reserved

public void SetAge(string p_name, int p_age) { // Create a Text command to perform an UPDATE // the age of a specified person IDbCommand sqlCmd = sqlCon.CreateCommand(); sqlCmd.CommandType = CommandType.Text; sqlCmd.CommandText = "UPDATE people SET age = @age" + " WHERE name = @name";

In this chapter, I explain the primitive thread synchronization constructs . By primitive, I mean the simplest constructs that are available to use in your code . There are two kinds of primitive constructs: user-mode and kernel-mode . Whenever possible, you should use the primitive user-mode constructs because they are significantly faster than the kernel-mode constructs as they use special CPU instructions to coordinate threads . This means that the coordination is occurring in hardware (which is what makes it fast) . But this also means that the Microsoft

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Specifically, the field that both members access is marked as volatile, a concept that will be discussed later in this chapter .

for the subnet ID. Therefore, the number of available subnets is 28, or 256. You do not usually need to subtract 2 from this total because most modern routers (including the Routing And Remote Access service in Microsoft Windows NT Server, Microsoft Windows 2000 Server, and Windows Server 2003) can accept a subnet ID made up of all 1s or all 0s. When you are configuring an address space and subnet mask to suit your network needs, be sure to assign a number of bits to the subnet ID that will accommodate all the subnets you now use and plan to use in the future. Remember, when determining this figure, that each physical network counts as a subnet.