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public sealed class LinkedList { private SomeKindOfLock m_lock = new SomeKindOfLock(); private Node m_head; public void Add(Node newNode) { m_lock.Acquire(); // The two lines below perform very fast reference assignments newNode.m_next = m_head; m_head = newNode; m_lock.Release(); } }

When calling a stored procedure, you must set CommandType to System.Data.CommandType.StoredProcedure and the CommandText must be set to the name of the stored procedure. Later in the "Parameters" section we provide an alternative DBDemo.SetAge implementation that calls a stored procedure to update the age of a person. For now, the following code fragment demonstrates the configuration of an IDbCommand to execute a stored procedure named SetAge. IDbDataParameter instances must be provided for each input and output parameter specified by the stored procedure as well as the stored procedure's return value.

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For any specific network address, you can determine the quantity of host addresses available within that network by raising 2 to the power of the number of bits in the host ID, and then subtracting 2. For instance, the network address 192.168.0.0/24 reserves 8 bits for the host ID. Therefore, you can determine the number of hosts by calculating 28 2, which equals 254.

While Add is now thread safe, it has also become substantially slower . How much slower depends on the kind of lock chosen; I will compare the performance of various locks in this chapter and in 29, Hybrid Thread Synchronization Constructs . But even the fastest

Using Calculator, you can easily compute the value of 2 to any power with the x^y button. This function appears only in Scientific view.

Excluding All-0s and All-1s Host IDs The value 2x yields the total number of distinct bit value combinations for a binary number of x bits, including the combinations of all 0s and all 1s. For example, the value 23 yields 8, which is the number of distinct bit value combinations for 3 bits. The list of these eight possible combinations is as follows:

28

// Create a command to call the Stored Procedure SetAge IDbCommand sqlCmd = sqlCon.CreateCommand(); sqlCmd.CommandType = CommandType.StoredProcedure; sqlCmd.CommandText = "SetAge";

000 = 0 (decimal) 001 = 1 (decimal) 010 = 2 (decimal) 011 = 3 (decimal) 100 = 4 (decimal) 101 = 5 (decimal) 110 = 6 (decimal) 111 = 7 (decimal)

lock could make the Add method several times slower than the version of it that didn t have any lock code in it at all Of course, the performance becomes significantly worse if the code calls Add in a loop to insert several nodes into the linked list The third problem with thread synchronization locks is that they allow only one thread to access the resource at a time This is the lock s whole reason for existing, but it is also a problem because blocking a thread causes more threads to be created So, for example, if a thread pool thread attempts to acquire a lock that it cannot have, it is likely that the thread pool will create a new thread to keep the CPUs saturated with work As discussed in 25, Thread Basics, creating a thread is very expensive in terms of both memory and performance .

However, combinations of all 0s and all 1s (0 and 7 in the preceding list) cannot be assigned to hosts because these addresses are reserved for other purposes. Specifically, the all-0s host ID is invalid because it is used to specify a network without specifying a host. The all-1s host ID cannot be assigned to a particular host because it is used by IP to broadcast a message to every host on a network. Because these values cannot be assigned to hosts, you must account for these nonusable host IDs by subtracting 2 from 2x when determining the host capacity of your network.

Parameters for use with stored procedures or for substitution into text commands are represented by IDbDataParameter instances. An IDbDataParameter object must be instantiated and configured to satisfy each parameter specified in an IDbCommand. The IDbCommand.Parameters property contains an IDataParameterCollection in which the parameter objects are placed before the command is executed. IDataParameterCollection inherits from IList, ICollection, and IEnumerable and thus provides flexibility for adding, retrieving, and manipulating the contained IDbDataParameter instances.