Can multiple threads call the same function?

There is nothing wrong in calling same function from different threads. If you want to ensure that your variables are consistent it is advisable to provide thread synchronization mechanisms to prevent crashes, racearound conditions.

What is a thread-safe function?

A threadsafe function protects shared resources from concurrent access by locks. The use of global data is thread-unsafe. Global data should be maintained per thread or encapsulated, so that its access can be serialized. A thread may read an error code corresponding to an error caused by another thread.

Are objects shared between threads?

5 Answers. Sharing mutable objects between threads is risky. The safest way is to make the objects immutable, you can then share them freely. If they must be mutable then each of the objects each needs to ensure their own thread safety using the usual methods to do so.

What is the problem when multiple threads work on same object?

Problems may occur when two or more threads are accessing the same data concurrently, for example, one thread stores data into the shared object and the other threads reads data, there can be synchronization problem if the first thread has not finished storing the data before the second one goes to read it.

How can multiple threads share a resource?

In a multithreaded server, it is possible for shared resources to be accessed concurrently. In addition to scope object attributes, shared resources include in-memory data (such as instance or class variables) and external objects such as files, database connections, and network connections.

What is likely to happen if you have multiple threads accessing the same resource in your program?

Multiple threads accessing shared data simultaneously may lead to a timing dependent error known as data race condition. Data races may be hidden in the code without interfering or harming the program execution until the moment when threads are scheduled in a scenario (the condition) that break the program execution.

What is threading and multi threading?

Multithreading is a model of program execution that allows for multiple threads to be created within a process, executing independently but concurrently sharing process resources. Depending on the hardware, threads can run fully parallel if they are distributed to their own CPU core.

Can multiple threads read and write the same shared_ptr at once?

“Multiple threads can simultaneously read and write different shared_ptr objects, even when the objects are copies that share ownership.” (MSDN: Thread Safety in the Standard C++ Library) Does that mean that changing shared_ptr object is safe?

How do you maintain state in a thread-safe class?

In object-oriented programming (OOP), objects actually need to maintain state through fields and implement behavior through one or more methods. If we actually need to maintain state, we can create thread-safe classes that don’t share state between threads by making their fields thread-local.

How thread-safe is this method in Java?

The method neither relies on external state nor maintains state at all. Hence, it’s considered to be thread-safe and can be safely called by multiple threads at the same time.

Is it bad to write to an object from multiple threads?

So writing to an object from multiple threads is bad unless it’s you have guarded it through a lock. So you can read from global_instancethe object by assigning new shared_ptr<>objects from it but you can’t write to it. // In thread 3 *global_instance = 3; int a = *global_instance; // In thread 4 *global_instance = 7;