It is possible for a multi-threaded 4Test script to reach a state in which competing threads block one another, so that the script cannot continue. This is called a script deadlock. When the 4Test runtime environment detects a deadlock, it raises an exception and halts the deadlocked script.
share INTEGER iIndex1 = 0 share INTEGER iIndex2 = 0 main () parallel access iIndex1 Sleep (1) access iIndex2 Print ("Accessed iIndex1 and iIndex2") access iIndex2 Sleep (1) access iIndex1 Print ("Accessed iIndex2 and iIndex1")