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And to make matters even worse, when the blocked threads gets to run again, it will run with this new thread pool thread; Windows is now scheduling more threads than there are CPUs, and this increases context switching, which also hurts performance The summary of all of this is that thread synchronization is bad, so you should try to design your applications to avoid as much of it as possible To that end, you should avoid shared data such as static fields When a thread uses the new operator to construct an object, the new operator returns a reference to the new object At this point in time, only the thread that constructs the object has a reference to it; no other thread can access that object .

When the string of 1-bits in the subnet mask is extended beyond its default to create multiple subnets within any address space, the host ID is shortened, and a new address space for the subnet IDs is created, as shown in Figure 2-10 and Figure 2-11.

2-28

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If you avoid passing this reference to another thread that might use the object at the same time as the creating thread, then there is no need to synchronize access to the object Try to use value types because they are always copied, so each thread operates on its own copy Finally, it is OK to have multiple threads accessing shared data simultaneously if that access is read-only For example, many applications create some data structures during their initialization Once initialized, the application can create as many threads as it wants; if all these threads just query the data, then all the threads can do this simultaneously without acquiring or releasing any locks .

If the IDbCommand uses positional parameters (as with the OLE Data Provider implementation), the IDbDataParameter instances must be placed in the collection in the same order they occur in the statement. Named parameters can be added in any order and will be mapped correctly during command execution. If a stored procedure provides a return value, the parameter to receive the return value must always be the first IDbDataParameter in the collection. Table 16-7 summarizes the members of IDbDataParameter.

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The String type is an example of this: Once a String object is created, it is immutable, so many threads can access a single String object at the same time without any chance of the String object becoming corrupted ..

Network ID (16 bits) 172 16 0 0 Host ID (16 bits)

Now, I d like to say a quick word about class libraries and thread synchronization . Microsoft s Framework Class Library (FCL) guarantees that all static methods are thread safe . This means that if two threads call a static method at the same time, no data will get corrupted . The FCL had to do this internally because there is no way that multiple companies producing different assemblies could coordinate on a single lock for arbitrating access to the resource . The Console class contains a static field, inside which many of its methods acquire and release to ensure that only one thread at a time is accessing the console . For the record, making a method thread safe does not mean that it internally takes a thread synchronization lock . A thread-safe method means that data doesn t get corrupted if two

172 16 0 0 # of hosts = 216 - 2 0 0 # of subnets (segments) = 1

Comments Gets or sets the data type of the parameter using a value from the System.Data.DbType enumeration. The DbType property and the implementation-specific SqlDbType and OleDbType properties are linked such that setting the DbType changes the implementation property to an equivalent implementation-specific data type. Gets or sets a value from the System.Data.ParameterDirection enumeration that indicates the type of parameter. Valid values are:

threads attempt to access the data at the same time . The System.Math class has a static Max method implemented as follows:

Figure 2-10

Network ID (16 bits) 172 16 0 0 Subnet ID (8 bits) Host ID (8 bits)

public static Int32 Max(Int32 val1, Int32 val2) { return (val1 < val2) val2 : val1; }

Input an input parameter InputOutput capable of both input and output Output an output parameter ReturnValue a stored procedure or function return value

AND Extended subnet mask (+8 bits)