mirror of https://github.com/polybar/polybar.git
79 lines
2.3 KiB
C++
79 lines
2.3 KiB
C++
#pragma once
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#include "modules/meta/base.hpp"
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POLYBAR_NS
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namespace modules {
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using interval_t = chrono::duration<double>;
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template <class Impl>
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class timer_module : public module<Impl> {
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public:
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using module<Impl>::module;
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void start() override {
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this->module<Impl>::start();
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this->m_mainthread = thread(&timer_module::runner, this);
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}
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protected:
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/**
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* Loads and sets the interval for this module.
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*
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* Will throw an exception if a non-positive (<= 0) number is given.
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*/
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void set_interval(interval_t def) {
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m_interval = this->m_conf.template get<decltype(m_interval)>(this->name(), "interval", def);
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if (m_interval <= 0s) {
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throw module_error(
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this->name() + ": 'interval' must be larger than 0 (got '" + to_string(m_interval.count()) + "s')");
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}
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}
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void runner() {
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this->m_log.trace("%s: Thread id = %i", this->name(), concurrency_util::thread_id(this_thread::get_id()));
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const auto check = [&]() -> bool {
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std::unique_lock<std::mutex> guard(this->m_updatelock);
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return CAST_MOD(Impl)->update();
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};
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try {
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// warm up module output before entering the loop
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check();
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CAST_MOD(Impl)->broadcast();
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while (this->running()) {
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if (check()) {
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CAST_MOD(Impl)->broadcast();
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}
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// wait until next full interval to avoid drifting clocks
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using clock = chrono::steady_clock;
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using sys_duration_t = clock::time_point::duration;
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auto sys_interval = chrono::duration_cast<sys_duration_t>(m_interval);
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clock::time_point now = clock::now();
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sys_duration_t adjusted = sys_interval - (now.time_since_epoch() % sys_interval);
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// The seemingly arbitrary addition of 500ms is due
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// to the fact that if we wait the exact time our
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// thread will be woken just a tiny bit prematurely
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// and therefore the wrong time will be displayed.
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// It is currently unknown why exactly the thread gets
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// woken prematurely.
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CAST_MOD(Impl)->sleep_until(now + adjusted + 500ms);
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}
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} catch (const exception& err) {
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CAST_MOD(Impl)->halt(err.what());
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}
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}
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protected:
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interval_t m_interval{1.0};
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};
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} // namespace modules
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POLYBAR_NS_END
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