PTHREAD_MUTEX_INITIALIZER being typeless

I found a comment in code stating that PTHREAD_MUTEX_INITIALIZER is typeless then the following code:

Code:

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const pthread_mutex_t pthread_mutex_initer = PTHREAD_MUTEX_INITIALIZER;

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then pthread_mutex_initer is used to initialize a pthread_mutex_t member variable.

What is meant by is typeless in this context? And why do they need the above code?

Thanks for the help.

>> then pthread_mutex_initer is used to initialize a pthread_mutex_t member variable.
What do you mean? Simple assignment of 'pthread_mutex_initer' to another pthread_mutex_t?

gg