What is atomic in Objective-C?
What is atomic in Objective-C?
In Objective-C the implementation of an atomic property allows properties to be safely read and written from different threads. For nonatomic properties, the underlying pointer of a read value could be released when a new value is being written at the same time.
Is atomic thread-safe Objective-C?
Atomic makes it thread safe to set or get a property, but it doesn’t make calling any methods of that property itself thread safe.
Is bool write Atomic?
Yes. Reads and writes of the following data types are atomic: bool, char, byte, sbyte, short, ushort, uint, int, float, and reference types.
What is @synchronized self?
@synchronized(self) is used to get rid of the self prefix when setting a property. So in my example below, I’m setting the strText of the instance, not just a local variable, right? – (void)myfunction{ NSString * strText = @”var in function”; @synchronized(self) { strText = @”var class (self.strText)”; } }
What is Nslock?
An object that coordinates the operation of multiple threads of execution within the same application.
Is atomic thread-safe C++?
In order to solve this problem, C++ offers atomic variables that are thread-safe. The atomic type is implemented using mutex locks. If one thread acquires the mutex lock, then no other thread can acquire it until it is released by that particular thread.
Can a bool type be used in Objective C?
You can use the (C99) bool type, but all of Apple’s Objective-C frameworks and most Objective-C/Cocoa code uses BOOL, so you’ll save yourself headache if the typedef ever changes by just using BOOL. “all of Apple’s frameworks” – not true.
Which is atomic Boolean asks for the value?
The atomic boolean repeatedly asks for the value (pull principle). std::atomic and the fully or partially specialisations of std::atomic supports the bread and butter of all atomic operations: compare_exchange_strong. This function has the syntax: bool compare_exchange_strong (T& expected, T& desired ).
How does the atomic Boolean work in modernescpp?
Because of the condition variable condVar or the atomic dataReady, the access to the shared variable mySharedWork is synchronised. This holds although mySharedWork is not protected by a lock or itself an atomic. Both programs produce the same result for mySharedWork.
How is the atomic keyword used in C?
_Atomic is a keyword and used to provide atomic types in C. Implementations are recommended to ensure that the representation of _Atomic(T) in C is same as that of std::atomic in C++ for every possible type T. The mechanisms used to ensure atomicity and memory ordering should be compatible.