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125 lines
3.3 KiB
C++
125 lines
3.3 KiB
C++
#pragma once
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#include <time.h>
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#include <mutex>
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#include <Poco/ScopedLock.h>
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#include <common/Common.h>
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#ifdef __APPLE__
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#include <common/apple_rt.h>
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#endif
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/** Отличается от Poco::Stopwatch только тем, что использует clock_gettime вместо gettimeofday,
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* возвращает наносекунды вместо микросекунд, а также другими незначительными отличиями.
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*/
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class Stopwatch
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{
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public:
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/** CLOCK_MONOTONIC работает сравнительно эффективно (~15 млн. вызовов в сек.) и не приводит к системному вызову.
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* Поставьте CLOCK_MONOTONIC_COARSE, если нужна больше производительность, но достаточно погрешности в несколько мс.
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*/
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Stopwatch(clockid_t clock_type_ = CLOCK_MONOTONIC) : clock_type(clock_type_) { restart(); }
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void start() { setStart(); is_running = true; }
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void stop() { updateElapsed(); is_running = false; }
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void restart() { elapsed_ns = 0; start(); }
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UInt64 elapsed() const { updateElapsed(); return elapsed_ns; }
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double elapsedSeconds() const { updateElapsed(); return static_cast<double>(elapsed_ns) / 1000000000ULL; }
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private:
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mutable UInt64 start_ns;
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mutable UInt64 elapsed_ns;
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clockid_t clock_type;
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bool is_running;
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void setStart()
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{
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struct timespec ts;
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clock_gettime(clock_type, &ts);
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start_ns = ts.tv_sec * 1000000000ULL + ts.tv_nsec;
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}
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void updateElapsed() const
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{
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if (is_running)
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{
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struct timespec ts;
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clock_gettime(clock_type, &ts);
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UInt64 current_ns = ts.tv_sec * 1000000000ULL + ts.tv_nsec;
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elapsed_ns += current_ns - start_ns;
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start_ns = current_ns;
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}
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}
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};
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class StopwatchWithLock : public Stopwatch
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{
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public:
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/** If specified amount of time has passed and timer is not locked right now, then restarts timer and returns true.
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* Otherwise returns false.
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* This is done atomically.
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*/
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bool lockTestAndRestart(double seconds)
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{
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std::unique_lock<std::mutex> lock(mutex, std::defer_lock);
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if (!lock.try_lock())
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return false;
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if (elapsedSeconds() >= seconds)
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{
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restart();
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return true;
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}
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else
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return false;
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}
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struct Lock
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{
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StopwatchWithLock * parent = nullptr;
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std::unique_lock<std::mutex> lock;
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Lock() {}
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operator bool() const { return parent != nullptr; }
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Lock(StopwatchWithLock * parent, std::unique_lock<std::mutex> && lock)
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: parent(parent), lock(std::move(lock))
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{
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}
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Lock(Lock &&) = default;
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~Lock()
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{
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if (parent)
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parent->restart();
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}
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};
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/** If specified amount of time has passed and timer is not locked right now, then returns Lock object,
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* which locks timer and, on destruction, restarts timer and releases the lock.
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* Otherwise returns object, that is implicitly casting to false.
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* This is done atomically.
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*
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* Usage:
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* if (auto lock = timer.lockTestAndRestartAfter(1))
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* /// do some work, that must be done in one thread and not more frequently than each second.
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*/
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Lock lockTestAndRestartAfter(double seconds)
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{
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std::unique_lock<std::mutex> lock(mutex, std::defer_lock);
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if (!lock.try_lock())
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return {};
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if (elapsedSeconds() >= seconds)
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return Lock(this, std::move(lock));
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return {};
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}
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private:
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std::mutex mutex;
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};
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