e02840c1a9
libstdc++-v3/ChangeLog: PR libstdc++/100806 * include/bits/semaphore_base.h (__atomic_semaphore::_M_release): Force _M_release() to wake all waiting threads. * testsuite/30_threads/semaphore/100806.cc: New test.
58 lines
1.1 KiB
C++
58 lines
1.1 KiB
C++
// { dg-options "-std=gnu++2a -pthread" }
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// { dg-do run { target c++2a } }
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// { dg-require-effective-target pthread }
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// { dg-require-gthreads "" }
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// { dg-add-options libatomic }
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#include <iostream>
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#include <sstream>
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#include <thread>
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#include <semaphore>
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#include <mutex>
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#include <chrono>
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#include <vector>
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std::counting_semaphore<4> semaphore{6};
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std::mutex mtx;
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std::vector<std::string> results;
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void thread_main(size_t x)
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{
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semaphore.acquire();
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std::this_thread::sleep_for(std::chrono::milliseconds(100));
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semaphore.release();
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{
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std::ostringstream stm;
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stm << "Thread " << x << " finished.";
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std::lock_guard g{ mtx };
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results.push_back(stm.str());
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}
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}
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int main()
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{
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constexpr auto nthreads = 10;
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std::vector<std::thread> threads(nthreads);
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size_t counter{0};
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for(auto& t : threads)
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{
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t = std::thread(thread_main, counter++);
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}
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for(auto& t : threads)
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{
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t.join();
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{
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std::lock_guard g{ mtx };
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for (auto&& r : results)
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std::cout << r << '\n';
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std::cout.flush();
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results.clear();
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}
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}
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}
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