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You ve now seen the two main situations in which it can be a good idea to use threading in your applications. However, sometimes spawning a new thread is a bad idea. Obviously, this isn t going to be a complete listing of inappropriate times to create new threads, but it will give you an idea of what constitutes a bad threading decision. We ll look at two main areas: the first is an instance where execution order is extremely important, and the second is a common coding mistake creating new threads in a loop.

In Example 2-15 I ve set the stalking options to d,u. This indicates that state stalking is enabled for DOWN (d) and UNREACHABLE (u) states. If I only wanted stalking on DOWN states, I d specify the stalking_options directive like so: stalking_options d

MySQL offers several ways to view the existing functions in your database. To see all of the functions across all databases, use the SHOW FUNCTION STATUS command, as shown in Listing 10-25.

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Recall the example, do_something_thread.vb, from earlier in the chapter where we created some code demonstrating the fact that execution randomly jumped from one thread to the other. It looked like one thread would execute and show 10 lines in the console, and then the next thread would show 15 and then return back to the original thread to execute 8. A common mistake in deciding whether to use threads or not is to assume that you know exactly how much code is going to execute in the thread s given time slice. The following example demonstrates this problem. It looks like the thread t1 will finish first because it starts first, but that s a big mistake. Create a console application called ExecutionOrder and set its startup object to Sub Main. Build and run this example a few times you ll get differing results: Imports System Imports System.Threading Public Class ExecutionOrder Shared t1 as Thread Shared t2 as Thread Public Shared Sub WriteFinished( _ ByVal threadName as String) Select Case threadName Case "T1" Console.WriteLine() Console.WriteLine("T1 Finished") Case "T2" Console.WriteLine() Console.WriteLine("T2 Finished") End Select End Sub Public Shared Sub Main() t1 = New Thread(AddressOf Increment) t2 = New Thread(AddressOf Increment) t1.Name = "T1" t2.Name = "T2" t1.Start() t2.Start() Console.ReadLine() End Sub Public Shared Sub Increment() Dim I as Long For I = 1 to 1000000 If I MOD 100000 = 0 Then Console.Write("({0}) , _ Thread.CurrentThread.Name) End If Next

With stalking options set to d as we ve done here, Nagios will only stalk the host when the host is in a DOWN state. Unless you require it, I recommend you don t enable state stalking as it will considerably add to the events logged by your Nagios server and skew your reporting figures. Or you should only enable it selectively on hosts and services you explicitly require additional monitoring on.

Note In the examples here, we use the \G switch from the mysql client utility to display the results in

WriteFinished(Thread.CurrentThread.Name) End Sub End Class Sometimes t1 will finish, and then t2 will execute some more code and then finish. Sometimes t2 will finish completely and then t1 will execute to completion. The point is that you can t count on the threads completing in the order they were started. In 15, we ll discuss how you can synchronize threads to execute in a specified order. However, it s important to note that synchronization doesn t happen by default. This isn t the only problem associated with execution order. Take the next piece of example code, ExecutionOrder2, where we show that data can be adversely affected by unsynchronized threads: Imports System Imports System.Threading Public Class ExecutionOrder2 Shared t1 As Thread Shared t2 As Thread Shared iIncr As Integer Public Shared Sub WriteFinished( _ ByVal threadName As String) Select Case threadName Case "T1" Console.WriteLine() Console.WriteLine( _ "T1 Finished: iIncr = {0}", iIncr) Case "T2" Console.WriteLine() Console.WriteLine( _ "T2 Finished: iIncr = {0}", iIncr) End Select End Sub Public Shared Sub Main() iIncr = 0 t1 = New Thread(AddressOf Increment) t2 = New Thread(AddressOf Increment) t1.Name = "T1" t2.Name = "T2" t1.Start() t2.Start() Console.Read() End Sub Public Shared Sub Increment() Dim I As Long

Listing 10-25. Output of SHOW FUNCTION STATUS mysql> SHOW FUNCTION STATUS\G *************************** 1. row *************************** Db: shop Name: calc_rush_shipping Type: FUNCTION Definer: mkruck@localhost Modified: 2005-02-09 20:13:06 Created: 2005-02-09 20:13:06 Security_type: DEFINER Comment:

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