Mastering Delphi Programming: A Complete Reference Guide

Synchronize and Queue

The second and third approaches are so similar that I've condensed them into one section.

The setup for this approach is the same as with the first shown in the Windows message method—we only have to initialize FValue and FNumTasks. The code in increment and decrement tasks also starts the same, with a for loop that increments or decrements the value but then uses a different approach to pass the value back to the main thread.

The following code uses TThread.Synchronize to execute an anonymous method in the target thread. Synchronize accepts a TThread object as a first parameter and an anonymous method in the second. It will execute the second parameter in the main thread. In the first parameter, we can pass either the ...