问题
I have gone through many answers about atomic and non-atomic properties. But I'm not able to understand whether atomic properties are thread safe? Please explain it with an example.
回答1:
Yes
an / one atomic property is thread-safe. That is what atomicity stands for.
CAUTION
But neither are two atomic properties thread-safe in regards to each other nor are the contents of an atomic property thread-safe. (sounds a bit confusing but has be said)
That means that your are always guaranteed to be able to read a fully functional value from the property, no broken pointer, or intermediary null or whatsoever.
BUT you are not guaranteed that the values inside that atomic property are thread-safe whatsoever. That is a completely different topic.
Making all properties of a class atomic will not at all make the class itself thread-safe.
回答2:
The property accessors are thread-safe. Basically an atomic property is equivalent to this:
- (id)atomicProperty {
@synchronized(self) {
return _atomicProperty;
}
}
- (void)setAtomicProperty:(id)atomicProperty {
@synchronized(self) {
_atomicProperty = atomicProperty;
}
}
来源：https://stackoverflow.com/questions/33723255/is-an-atomic-property-thread-safe