nerix
41 lines
981 B
C++
41 lines
981 B
C++
#pragma once
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#include <chrono>
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#include <condition_variable>
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#include <mutex>
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namespace chatterino {
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/// @brief A flag that can only be set once which notifies waiters.
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///
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/// This can be used to synchronize with other threads. Note that waiting
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/// threads will be suspended.
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class OnceFlag
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{
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public:
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OnceFlag();
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/// Set this flag and notify waiters
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void set();
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/// @brief Wait for at most `ms` until this flag is set.
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///
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/// The calling thread will be suspended during the wait.
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///
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/// @param ms The maximum time to wait for this flag
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/// @returns `true` if this flag was set during the wait or before
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bool waitFor(std::chrono::milliseconds ms);
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/// @brief Wait until this flag is set by another thread
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///
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/// The calling thread will be suspended during the wait.
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void wait();
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private:
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std::mutex mutex;
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std::condition_variable condvar;
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std::atomic<bool> flag = false;
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};
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} // namespace chatterino
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