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Simple question: does the Java memory/synchronization model guarantee atomic pointer writes? That is, if we have competing threads:
String shared;
thread1()
{
shared = "a";
}
thread2()
{
shared = "hello world";
}
started at the same time, is shared always guaranteed to be null, "a", or "hello world"?
Reads and writes are atomic for reference variables.
Source: http://docs.oracle.com/javase/tutorial/essential/concurrency/atomic.html