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In addition to obtaining a full and complete list of all running processes on a given machine, the static Process.GetProcessById() method allows you to obtain a single Process object via the associated PID. If you request access to a nonexistent PID, an ArgumentException exception is thrown. For example, if you were interested in obtaining a Process object representing a process with the PID of 987, you could write the following code: // If there is no process with the PID of 987, a // runtime exception will be thrown. static void GetSpecificProcess() { Process theProc = null; try { theProc = Process.GetProcessById(987); } catch(ArgumentException ex) { Console.WriteLine(ex.Message); } } At this point, you have learned how to get a list of all processes, or a specific process on a machine via a PID lookup. While it is somewhat useful to discover PIDs and process names, the Process class also allows you to discover the set of current threads and libraries used within a given process. Let s see how to do so.

The {users}.uid that read the {node}.nid The {node}.nid that was read The Unix timestamp at which the read occurred

The set of threads is represented by the strongly typed ProcessThreadCollection collection, which contains some number of individual ProcessThread objects. To illustrate, assume the following additional static helper function has been added to your current application:

static void EnumThreadsForPid(int pID) { Process theProc = null; try { theProc = Process.GetProcessById(pID); } catch(ArgumentException ex) { Console.WriteLine(ex.Message); return; } // List out stats for each thread in the specified process. Console.WriteLine("Here are the threads used by: {0}", theProc.ProcessName); ProcessThreadCollection theThreads = theProc.Threads; foreach(ProcessThread pt in theThreads) { string info = string.Format("-> Thread ID: {0}\tStart Time: {1}\tPriority: {2}", pt.Id , pt.StartTime.ToShortTimeString(), pt.PriorityLevel); Console.WriteLine(info); } Console.WriteLine("************************************\n"); } As you can see, the Threads property of the System.Diagnostics.Process type provides access to the ProcessThreadCollection class. Here, you are printing out the assigned thread ID, start time, and priority level of each thread in the process specified by the client. Now, update your program s Main() method to prompt the user for a PID to investigate, as follows: static void Main(string[] args) { ... // Prompt user for a PID and print out the set of active threads. Console.WriteLine("***** Enter PID of process to investigate *****"); Console.Write("PID: "); string pID = Console.ReadLine(); int theProcID = int.Parse(pID); EnumThreadsForPid(theProcID); Console.ReadLine(); } When you run your program, you can now enter the PID of any process on your machine, and see the threads used in the process. The following output shows the threads used by PID 108 on my machine, which happens to be hosting Microsoft Internet Explorer:

The {image_styles}.isid for an image style The weight of the effect in the style The unique name of the effect to be executed The configuration data for the effect

***** Enter PID of process to PID: 108 Here are the threads used by: -> Thread ID: 680 Start -> Thread ID: 2040 Start -> Thread ID: 880 Start -> Thread ID: 3380 Start -> Thread ID: 3376 Start -> Thread ID: 3448 Start -> Thread ID: 3476 Start -> Thread ID: 2264 Start -> Thread ID: 2380 Start -> Thread ID: 2384 Start -> Thread ID: 2308 Start -> Thread ID: 3096 Start -> Thread ID: 3600 Start -> Thread ID: 1412 Start

investigate ***** iexplore Time: 9:05 AM Time: 9:05 AM Time: 9:05 AM Time: 9:05 AM Time: 9:05 AM Time: 9:05 AM Time: 9:05 AM Time: 9:05 AM Time: 9:05 AM Time: 9:05 AM Time: 9:05 AM Time: 9:07 AM Time: 9:45 AM Time: 10:02 AM Priority: Priority: Priority: Priority: Priority: Priority: Priority: Priority: Priority: Priority: Priority: Priority: Priority: Priority: Normal Normal Normal Normal Normal Normal Normal Normal Normal Normal Normal Highest Normal Normal

isid serial, unsigned auto increment name varchar(255)

The ProcessThread type has additional members of interest beyond Id, StartTime, and PriorityLevel. Table 16-4 documents some members of interest. Table 16-4. Select Members of the ProcessThread Type

Gets the current priority of the thread Gets the unique identifier of the thread Sets the preferred processor for this thread to run on Gets or sets the priority level of the thread Sets the processors on which the associated thread can run Gets the memory address of the function that the operating system called that started this thread Gets the time that the operating system started the thread Gets the current state of this thread Gets the total amount of time that this thread has spent using the processor Gets the reason that the thread is waiting