The program got deadlocked when several threads tried to use the same system resource at once.

deadlocked 是动词 deadlock 的过去分词形式。deadlock 由 dead（"死的"）和 lock（"锁定"）组成，字面意思是"死锁"，指计算机程序中多个线程互相等待对方释放资源而无法继续执行的状态。