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@(@\newcommand{\W}[1]{ \; #1 \; } \newcommand{\R}[1]{ {\rm #1} } \newcommand{\B}[1]{ {\bf #1} } \newcommand{\D}[2]{ \frac{\partial #1}{\partial #2} } \newcommand{\DD}[3]{ \frac{\partial^2 #1}{\partial #2 \partial #3} } \newcommand{\Dpow}[2]{ \frac{\partial^{#1}}{\partial {#2}^{#1}} } \newcommand{\dpow}[2]{ \frac{ {\rm d}^{#1}}{{\rm d}\, {#2}^{#1}} }@)@This is cppad-20221105 documentation. Here is a link to its current documentation .
Multi-Threaded chkpoint_two Take Down

Syntax
ok = multi_chkpoint_two_takedown(square_root)

Purpose
This routine gathers up the results for each thread and frees memory that was allocated by multi_chkpoint_two_setup .

Thread
It is assumed that this function is called by thread zero and all the other threads are blocked (waiting).

square_root
This argument has prototype
    vector<double>& square_root
 The input value of square_root does not matter. Upon return, it has the same size and is the element by element square root of y_squared .

ok
This return value has prototype
    bool ok
 If it is false, multi_chkpoint_two_takedown detected an error.

Source 

namespace {
bool multi_chkpoint_two_takedown(vector<double>& square_root)
{   bool ok            = true;
    ok                &= thread_alloc::thread_num() == 0;
    size_t num_threads = std::max(num_threads_, size_t(1));
    //
    // extract square roots in original order
    square_root.resize(0);
    for(size_t thread_num = 0; thread_num < num_threads; thread_num++)
    {   // results for this thread
        size_t n = work_all_[thread_num]->square_root->size();
        for(size_t i = 0; i < n; i++)
            square_root.push_back((* work_all_[thread_num]->square_root )[i]);
    }
    //
    // go down so that free memory for other threads before memory for master
    size_t thread_num = num_threads;
    while(thread_num--)
    {   // check that this tread was ok with the work it did
        ok  &= work_all_[thread_num]->ok;
        //
        // run destructor on vector object for this thread
        delete work_all_[thread_num]->y_squared;
        delete work_all_[thread_num]->square_root;
        //
        // run destructor on function object for this thread
        delete work_all_[thread_num]->fun;
        //
        // delete problem specific information
        void* v_ptr = static_cast<void*>( work_all_[thread_num] );
        thread_alloc::return_memory( v_ptr );
        //
        // Note that checkpoint object has memory connect to each thread
        // thread_alloc::inuse(thread_num) cannot be zero until it is deleted
        if( thread_num > 0 )
        {   ok &= thread_alloc::inuse(thread_num) > 0;
            //
            // return all memory that is not in use and
            // but being held for future use by this thread
            thread_alloc::free_available(thread_num);
        }
    }
    return ok;
}
}
Input File: example/multi_thread/multi_chkpoint_two.cpp