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Several Visual Studio user interface elements help you debug multithreaded apps. This article introduces multithreaded debugging features in the code editor window, Debug Location toolbar, and Threads window. For information about other tools for debugging multithreaded apps, see Get started debugging multithreaded apps.
Completing this tutorial takes only a few minutes, and familiarizes you with the basics of debugging multithreaded apps.
Create a multithreaded app project
Create the following multithreaded app project to use in this tutorial:
Dev C++ Project Bar Stuck Windows 10Start debugging
Examine thread markers
Flag and unflag threads
You can flag threads to keep track of threads you want to pay special attention to.
Flag and unflag threads from the source code editor or from the Threads window. Choose whether to display only flagged threads, or all threads, from the Debug Location or Threads window toolbars. Selections made from any location affect all locations.
Flag and unflag threads in source code
Flag and unflag threads in the Threads window
In the Threads window, flagged threads have red flag icons next to them, while unflagged threads, if shown, have empty icons.
Select a flag icon to change the thread state to flagged or unflagged, depending on its current state.
You can also right-click a line and select Flag, Unflag, or Unflag All Threads from the shortcut menu.
The Threads window toolbar also has a Show Flagged Threads Only button, which is the righthand one of the two flag icons. It works the same as the button on the Debug Location toolbar, and either button controls the display in both locations.
Other Threads window features
In the Threads window, select the header of any column to sort the threads by that column. Select again to reverse the sort order. If all threads are showing, selecting the flag icon column sorts the threads by flagged or unflagged status.
The second column of the Threads window (with no header) is the Current Thread column. A yellow arrow in this column marks the current execution point.
The Location column shows where each thread appears in the source code. Select the expand arrow next to the Location entry, or hover over the entry, to show a partial call stack for that thread.
Tip
For a graphical view of the call stacks for threads, use the Parallel Stacks window. To open the window, while debugging, select Debug> Windows > Parallel Stacks.
Dev C++ Project Bar Stuck Video
In addition to Flag, Unflag, and Unflag All Threads, the right-click context menu for Thread window items has:
Freeze and thaw thread execution
You can freeze and thaw, or suspend and resume, threads to control the order in which the threads perform work. Freezing and thawing threads can help you resolve concurrency issues, such as deadlocks and race conditions.
Tip
To follow a single thread without freezing other threads, which is also a common debugging scenario, see Get started debugging multithreaded applications.
To freeze and unfreeze threads:
Switch to another thread
You may see a The application is in break mode window when you try to switch to another thread. This window tells you that the thread does not have any code that the current debugger can display. For example, you may be debugging managed code, but the thread is native code. The window offers suggestions for resolving the issue.
To switch to another thread:
With the thread marker in source code, you can switch only to threads that are stopped at that location. By using the Threads window and Debug Location toolbar, you can switch to any thread.
You've now learned the basics of debugging multithreaded apps. You can observe, flag and unflag, and freeze and thaw threads by using the Threads window, the Thread list in the Debug Location toolbar, or thread markers in the source code editor.
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