What to pass to thread for dynamic memory

Question

Hello

I came across a question about thread and heap memory :

What should be passed to thread function ?
1. shared pointer
2. Raw pointer
3. Shared pointer with reference
4. Any other better choice

Answer 1

Generally it is good to avoid anything shared when working with threads, unless the shared resource is carefully guarded to prevent race conditions and gridlock. I cast my vote for "2. raw pointer" so the thread may own the allocated memory exclusively.

Answer 2

Thanks.... AFIK, heap is not safe across the threads.... stack is threadsafe but not heap...

So , is it not safe either we pass it as shared or raw... correct or Am i missing something ?