Is enum thread-safe C++?
Thread-safety is a property of code, not variables. The only guarantee you get for an enum is that it is atomic, that’s not nearly good enough. The code that accesses an object of MyClass must arbitrate access when necessary. It will be necessary when threads both read and write that property.
Why enum is best for Singleton?
Creation of Enum instance is thread-safe By default, the Enum instance is thread-safe, and you don’t need to worry about double-checked locking. In summary, the Singleton pattern is the best way to create Singleton in Java 5 world, given the Serialization and thread-safety guaranteed and with some line of code enum.
Are enums thread-safe C#?
However, the standard C# List and Enumerator are not thread-safe and we started seeing problems when the list is modified by one thread whilst another is trying to loop through it. …
Is enum is important in Java?
Enums are used when we know all possible values at compile time, such as choices on a menu, rounding modes, command line flags, etc. It is not necessary that the set of constants in an enum type stay fixed for all time. In Java (from 1.5), enums are represented using enum data type.
Is enum compile time constant?
Enum values or Enum instances are public, static, and final in Java. They are a compile-time constant, which means you can not changes values of Enum instances and further assignment will result in a compile-time error.
Which is a limitation of an enum?
There’s one limitation of enum types: although enum types are classes, you cannot define a hierarchy of enums. In other words, it’s not possible for one enum type to extend another enum type.
Is enum singleton lazy?
Problems with enum as singleton By default, enums do not support lazy loading. Though it’s very very rare but if you changed your mind and now want to convert your singleton to multi-ton, enum would not allow this.
Is Linq thread-safe?
LINQ operations are read-only so they are thread safe on all collections. Normal collections invalidate iterators when they are modified, while the thread-safe collections do not. In some cases, (eg in ConcurrentQueue) this is achieved by presenting a snapshot of the data during iteration.
Is foreach thread-safe?
The foreach operation itself is not thread safe. Say if you run a foreach loop to remove item from forward direction, it’ll fail with “Collection was modified; enumeration operation may not execute.” exception message.
Is enum thread safe in Java?
Creation of Enum instance is thread-safe By default, the Enum instance is thread-safe, and you don’t need to worry about double-checked locking. In summary, the Singleton pattern is the best way to create Singleton in Java 5 world, given the Serialization and thread-safety guaranteed and with some line of code enum.
How can I make the enumerator thread-safe?
Another possible upgrade to the thread-safe enumerator is using ReaderWriterLock (or even better, ReaderWriterLockSlim) in place of Monitor. As iterations do not change the collection, it makes sense to allow many concurrent iterations at once, and only block concurrent changes to the collection. This is what ReaderWriterLock is for!
How do I iterate through a collection of objects thread-safe?
Another way to have iteration in a thread-safe way is to simply make a copy of a collection: That assumes that the Clone () method is thread-safe. Even when it is, this pattern cannot boast high performance – we’re actually iterating twice through the whole collection, to say nothing of allocating and then garbage-collecting memory for a clone.