Application.ProcessMessages

Object Pascal — Delphi & Free Pascal

Warning

Delphi

Re-entering the message loop causes reentrancy bugs and unpredictable UI state

re-entering the message loop causes reentrancy bugs and unpredictable UI state.

Why this severity

re-entering the message loop causes reentrancy bugs and unpredictable UI state.

Known false positives

small utility apps with a single blocking operation and no reentrancy risk.

Remediation example

TTask.Run(procedure
begin
  DoLongWork;
  TThread.Synchronize(nil, UpdateUI);
end);

Related Delphi rules