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What is thread-safe rule?
Solution: If a method (instance or static) only references variables scoped within that method then it is thread safe because each thread has its own stack: In this instance, multiple threads could call ThreadSafeMethod concurrently without issue. If a method only accesses local variables, it’s thread safe.
Is mutable thread-safe C++?
No, the mutable keyword is so that you can have fields inside an object that can change even when the object is const, such as for metadata that isn’t part of an object’s properties but its management (such as counters, etc.). It has nothing to do with threading.
Is the standard library thread-safe?
Unless otherwise specified, standard library classes may safely be instantiated from multiple threads and standard library functions are reentrant, but non-const use of objects of standard library types is not safe if shared between threads.
Is QString thread-safe?
For example, QString is reentrant but not thread-safe. You can safely access different instances of QString from multiple threads simultaneously, but you can’t safely access the same instance of QString from multiple threads simultaneously (unless you protect the accesses yourself with a QMutex).
Is Const thread safe?
In conclusion, const does mean thread-safe from the Standard Library point of view. It is important to note that this is merely a contract and it won’t be enforced by the compiler, if you break it you get undefined behavior and you are on your own.
Is STD list thread safe?
Generally, yes. If every thread/path that modifies or reads the list locks the same mutex before doing so, then access to the list can be considered thread safe. Note that caveats apply if someone holds on to iterators, references or pointers to list items outside the scope of the lock.
Is STD cout thread safe?
A side note: std::cout is thread-safe But that is only an optical issue. The program is well defined. The remark is valid for all input and output streams.
Are functions thread safe?
A threadsafe function protects shared resources from concurrent access by locks. Thread safety concerns only the implementation of a function and does not affect its external interface. The use of global data is thread-unsafe.