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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?
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When you sync a device with your computer, the syncing process results in both the device and the computer being updated with the most up-to-date files. Another example is when you sync iTunes with your iPhone or iPod, the music then exists on the computer and device.
Use the synchronized keyword. Using the synchronized keyword on the methods will require threads to obtain a lock on the instance of sample . Thus, if any one thread is in newmsg() , no other thread will be able to get a lock on the instance of sample , even if it were trying to invoke getmsg() .
yes but if you start even 2 processes w/ 1.6GB you are already out of the Windows addressable space.
Synchronization is required to prevent several threads from accessing a resource allowing only one thread at a time. Java's synchronized blocks, denoted by the synchronized keyword, allow you to handle several threads at once. In each case, a thread must acquire and release a lock on the method or block.
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.
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