Deadlock Property Analysis of Concurrent Programs Based on Petri Net Structure

Deadlocks of concurrent programs are abnormal and need to be avoided. The deadlock property is analyzed in the paper. To reduce the analysis complexity, the decomposition method is presented. The Petri net model of concurrent programs is decomposed into multiple process nets based on the number of processes and message places in a concurrent program. The relation between process nets and the Petri net model of a concurrent program is studied. By analysis of deadlocks of process nets, deadlocks of concurrent programs are concluded. For an important subclass, deadlock property of concurrent programs is determined based on the deadlock property and the static structure of process nets. The decision condition of deadlocks is proposed. The concepts and techniques given in this paper are shown with some examples.