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listing3-1.cpp
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listing3-1.cpp
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// Listing 3.1 Protecting a list with a mutex
#include <iostream>
#include <list>
#include <mutex>
#include <algorithm>
#include <thread>
std::list<int> nums = {1,2,3};
std::mutex nums_mutex;
void add_to_list(int val) {
std::cout << "Adding "<< val << " to list \n";
std::lock_guard<std::mutex> guard(nums_mutex);
nums.push_back(val);
}
bool list_contains(int val) {
std::lock_guard<std::mutex> guard(nums_mutex);
return std::find(nums.begin(), nums.end(), val) != nums.end();
}
void print_list() {
std::cout << "Printing list \n";
std::lock_guard<std::mutex> guard(nums_mutex);
for (auto const &i: nums) {
std::cout << i << "\t";
}
std::cout << std::endl;
}
void perform_list_ops() {
std::this_thread::sleep_for(std::chrono::milliseconds(1));
add_to_list(3);
add_to_list(7);
print_list();
std::cout << "Found 5 in list = " << list_contains(5) << std::endl;
add_to_list(5);
std::this_thread::sleep_for(std::chrono::milliseconds(1));
}
int main()
{
std::cout << "Creating threads \n";
std::thread t1(perform_list_ops);
std::thread t2(perform_list_ops);
t1.join();
t2.join();
return 0;
}