Testing display synchronization

This example shows that script tags executed during page rendering are not executed concurrently with timer event functions. If such interleaving would occur, a test run would report that one of the threads has been blocked during access to the monitor object.

Unfortunately, even the concurrency problems observed in the window opening example cannot be reproduced using this example.

Action triggers

Test display thread

Test onload thread

Acquire lock (A) Acquire lock (B)

Clear console

Display thread iframe

Console output