VSoft.CancellationToken

This is a simple library for Delphi that provides a CancellationTokenSource and CancellationToken much like those in .NET

Supported Compilers & Platforms

Compiler	Win32	Win64	macOS (Intel)	macOS (Apple Silicon)	Linux64
Delphi XE2 – 10.1	✅	✅
Delphi 10.2	✅	✅			✅
Delphi 10.3 – 10.4	✅	✅	✅		✅
Delphi 11.0 – 13.0	✅	✅	✅	✅	✅

macOS support requires Delphi 10.3 or later (OSX64); Apple Silicon (OSXARM64) requires Delphi 11.0 or later. Linux (Linux64) requires Delphi 10.2 or later and the Enterprise or Architect edition (the Linux target is not available in Professional).

Usage

Create a ICancellationTokenSource, pass its Token to the work you want to be able to cancel, then call Cancel when you want to signal cancellation.

uses
  VSoft.CancellationToken;

var
  source : ICancellationTokenSource;
  token  : ICancellationToken;
begin
  source := TCancellationTokenSourceFactory.Create;
  token  := source.Token;

  // pass token to your worker thread/method, which periodically checks:
  //   if token.IsCancelled then Exit;
  // or blocks with:
  //   token.WaitFor(timeoutMs);

  // when you want to cancel:
  source.Cancel;
end;

Platform notes

The token exposes the underlying wait primitive so callers can wait on it together with other handles/events:

• On Windows, ICancellationToken.Handle returns the Win32 event THandle. Do not call SetEvent on this handle directly.
• On other platforms (macOS, Linux), ICancellationToken.Event returns the System.SyncObjs.TEvent instance.

The cross-platform WaitFor and IsCancelled methods are available everywhere and should be preferred where possible.