Question

Since I’ve started programming in Java I have been wondering this (about a year or two). In C, we must know the different method to correctly avoid deadlock between thread and thus there is much more choice between synchronization method.

So what about Java? When we synchronize, how does it avoid putting thread in deadlock situation? How does it work internally? Does the deadlock are avoided because we synchronized on higher level than in C ( or C++)? Any documentation about deadlock and synchronization in java?

Answer 1

Under the hood it is using two opcodes monitorenter and monitorexit at the byte code level which acquire/release locks on an object reference at a JVM global level. I highly recommend you read How the Java virtual machine performs thread synchronization.