In multithreaded C/C++, does malloc/new lock the heap when allocating memory

Question

I\'m curious as to whether there is a lock on memory allocation if two threads simultaneously request to allocate memory. I am using OpenMP to do multithreading, C++ code.

Answer 1

http://en.wikipedia.org/wiki/Malloc

Modern malloc implementations try to be as lock-free as possible by keeping separate "arenas" for each thread.