chsvthrd\chsv_thread_local_2.cpp

Demonstrates a usage and an effect of the chsv_thread_local macro.

#include <thread>
#include <mutex>
#include <iostream>
#include <vector>
#include "chsvthrd.h"
 
chsv_thread_local(int, file_scope) = 2;
 
int main(int, char**)
{
    const unsigned int threads = 8;
    //file_scope = 1;
    static chsv_thread_local(int, block_scope) = file_scope;
    std::mutex io_lock;
    std::cout << "Initial values:\n\tfile_scope = " << file_scope << "\n\tblock_scope = " << block_scope << std::endl;
    ++file_scope; ++block_scope;
    auto thr = [&]()->void
            {
                std::lock_guard<std::mutex> lock(io_lock);
                ++file_scope; ++block_scope;
                std::cout << "A thread " << std::this_thread::get_id() <<
                        " with values captured by value:\n\tfile_scope = " << file_scope << "\n\tblock_scope = " << block_scope << std::endl;
            };
    std::vector<std::thread> vec;
    for (unsigned i = 0; i < threads; ++i)
        vec.emplace_back(thr);
    for (auto& it:vec)
        it.join();
    std::wcout << "All threads terminated." << std::endl;
    std::cout << "Final values:\n\tfile_scope = " << file_scope << "\n\tblock_scope = " << block_scope << std::endl;
 
    return 0;
}
/*
Output:
=======
Initial values:
    file_scope = 2
    block_scope = 2
A thread 2 with values captured by value:
    file_scope = 3
    block_scope = 1
A thread 3 with values captured by value:
    file_scope = 3
    block_scope = 1
A thread 6 with values captured by value:
    file_scope = 3
    block_scope = 1
A thread 7 with values captured by value:
    file_scope = 3
    block_scope = 1
A thread 8 with values captured by value:
    file_scope = 3
    block_scope = 1
A thread 4 with values captured by value:
    file_scope = 3
    block_scope = 1
A thread 9 with values captured by value:
    file_scope = 3
    block_scope = 1
A thread 5 with values captured by value:
    file_scope = 3
    block_scope = 1
All threads terminated.
Final values:
    file_scope = 3
    block_scope = 3
*/