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45 lines
1.4 KiB
45 lines
1.4 KiB
#include "all_cases.h"
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#include <iostream>
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#include <thread>
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#include <unistd.h>
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std::vector<uint32_t> AllCases::basic_ranges;
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bool AllCases::basic_ranges_available = false;
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std::mutex AllCases::basic_ranges_building;
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void AllCases::build_basic_ranges() {
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std::cout << std::this_thread::get_id() << " enter build function" << std::endl;
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if (AllCases::basic_ranges_available) {
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std::cout << std::this_thread::get_id() << " data already built -> skip" << std::endl;
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return; // basic ranges already built
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}
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if (AllCases::basic_ranges_building.try_lock()) { // lock success -> not building
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std::cout << std::this_thread::get_id() << " try lock success -> start build process" << std::endl;
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AllCases::basic_ranges.emplace_back(0);
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AllCases::basic_ranges.emplace_back(1);
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AllCases::basic_ranges.emplace_back(2);
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sleep(2); // assume using a lot of time
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AllCases::basic_ranges_available = true; // enable available flag
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std::cout << std::this_thread::get_id() << " build complete -> continue" << std::endl;
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} else { // another thread building
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std::cout << std::this_thread::get_id() << " another thread building -> wait" << std::endl;
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AllCases::basic_ranges_building.lock(); // blocking wait
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}
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std::cout << std::this_thread::get_id() << " work complete -> unlock" << std::endl;
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AllCases::basic_ranges_building.unlock();
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}
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