Syntax  # include <cppad/thread_alloc.hpp>
The C++ new and delete operators are thread safe, but this means that a thread may have to wait for a lock on these operations. Once memory is obtained for a thread, the thread_alloc memory allocator keeps that memory available for the thread so that it can be re-used without waiting for a lock. All the CppAD memory allocations use this utility. The free_available function should be used to return memory to the system (once it is no longer required by a thread).
The routines in sections below are defined by cppad/thread_alloc.hpp. This file is included by cppad/cppad.hpp, but it can also be included separately with out the rest of the CppAD.