How Can I Pass a C Class Member Function to pthread_create()?

Passing Class Functions to pthread_create()

Let's consider a scenario where we have a C class containing a member function, "print," which we want to execute in a separate thread using pthread_create(). However, we encountered a compilation error:

pthread_create(&t1, NULL, &c[0].print, NULL);

This error is due to the fact that the C class member function implicitly contains a this pointing to the current class pointer as its first parameter. However, pthread_create() expects a standard function pointer, which does not have a this pointer. Therefore, the compiler cannot convert such a function pointer to the function type required by pthread_create().

Solution

To solve this problem, we need to adopt an alternative approach that allows us to call class member functions from pthread_create(). There are two common approaches:

Using static class methods

Static class methods do not contain this pointers because it is not associated with a specific class instance. It can be called like a normal function like this:

Using wrapper functions

Another way is to create a class member function wrapped as a normal function wrapper function. This wrapper function accepts a class instance as its first argument and calls the member function like this:

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