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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 atomic_two Common Information

Purpose
This source code defines the common variables that are used by the multi_atomic_two_name functions.

Source 

namespace {
    // Number of threads, set by multi_atomic_two_time
    // (zero means one thread with no multi-threading setup)
    size_t num_threads_ = 0;

    // Number of Newton iterations, set by multi_atomic_two_time
    size_t num_itr_;

    // We can use one atomic_atomic function for all threads because
    // there is no member data that gets changed during worker call.
    // This needs to stay in scope for as long as a recording will use it.
    // We cannot be in parallel mode when this object is created or deleted.
    // We use a pointer so that there is no left over memory in thread zero.
    atomic_user* a_square_root_ = 0;

    // structure with information for one thread
    typedef struct {
        // used by worker to compute the square root, set by multi_atomic_two_setup
        CppAD::ADFun<double>* fun;
        //
        // value we are computing square root of, set by multi_atomic_two_setup
        vector<double>* y_squared;
        //
        // square root, set by worker
        vector<double>* square_root;
        //
        // false if an error occurs, true otherwise, set by worker
        bool ok;
    } work_one_t;
    //
    // Vector with information for all threads
    // (uses pointers instead of values to avoid false sharing)
    // allocated by multi_atomic_two_setup, freed by multi_atomic_two_takedown
    work_one_t* work_all_[CPPAD_MAX_NUM_THREADS];
}
Input File: example/multi_thread/multi_atomic_two.cpp