The importance of measuring performance changes is a topic that has been covered by others smarter and more experienced than me, but I have a recent simple tale.
I’ve simplified the code quite a bit in order to demonstrate the issue. Suppose I have a wrapper around an image (it has many more attributes):
[...]
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In C#, If you need to unit test a class that fires an event in certain circumstances (perhaps even asynchronously), you need to handle a little more than just running some code and doing the assertion. You have to make sure your unit test waits for the event to be fired. Here’s one naive way [...]
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In .Net you have the option of Thread.Suspend() and Thread.Abort(), but under normal circumstances these are horrible options to use because they’re likely to create locking problems (i.e., the thread has a locks on resource that other threads need).
A far better way is to signal to the thread that it should pause and wait for a signal to continue. [...]
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Exceptions
In the previous tutorial, I described the various synchronization objects you can use to control access to shared objects. In most cases, these will work fine, but consider the following situation:
[code lang="cpp"]
UINT ThreadFunc(LPVOID lParam)
{
::criticalSection.Lock();
::globalData.DoSomething();
SomeFunctionThatThrowsException();
::criticalSection.Unlock();
return 0;
}[/code]
What’s going to happen when that exception gets thrown? The critical section will never be unlocked. If you start the thread [...]
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Introduction
In part I, I looked at getting threads communicating with each other. Now let’s look at how we can manage how multiple threads operate on single objects.
Let’s take an example. Suppose we have a global variable (or any variable that is accessible to two or more threads via scope, pointers, references, whatever). Let’s say this [...]
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There are two types of threads in MFC. Worker and User Interface. Here, I will discuss how to use a worker thread.First, let’s discuss some multi-threading basics. Each application has what we call a process. Usually, an application has only one process. This process defines all the code and memory space for the application. You [...]
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