f813bb52a2
Now that the "unix" pledge is no longer required for socket I/O, we can drop it after making the connections we need in a program. In most GUI program cases, once we've connected to the WindowServer by instantiating a GApplication, we no longer need "unix" :^)
95 lines
2.5 KiB
C++
95 lines
2.5 KiB
C++
#include <AK/CircularQueue.h>
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#include <LibCore/CProcessStatisticsReader.h>
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#include <LibDraw/Palette.h>
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#include <LibGUI/GApplication.h>
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#include <LibGUI/GPainter.h>
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#include <LibGUI/GWidget.h>
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#include <LibGUI/GWindow.h>
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#include <stdio.h>
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class GraphWidget final : public GWidget {
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C_OBJECT(GraphWidget)
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public:
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GraphWidget()
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: GWidget(nullptr)
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{
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start_timer(1000);
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}
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virtual ~GraphWidget() override {}
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private:
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virtual void timer_event(CTimerEvent&) override
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{
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unsigned busy;
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unsigned idle;
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get_cpu_usage(busy, idle);
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unsigned busy_diff = busy - m_last_busy;
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unsigned idle_diff = idle - m_last_idle;
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m_last_busy = busy;
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m_last_idle = idle;
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float cpu = (float)busy_diff / (float)(busy_diff + idle_diff);
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m_cpu_history.enqueue(cpu);
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update();
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}
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virtual void paint_event(GPaintEvent& event) override
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{
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GPainter painter(*this);
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painter.add_clip_rect(event.rect());
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painter.fill_rect(event.rect(), Color::Black);
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int i = m_cpu_history.capacity() - m_cpu_history.size();
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for (auto cpu_usage : m_cpu_history) {
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painter.draw_line(
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{ i, rect().bottom() },
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{ i, (int)(height() - (cpu_usage * (float)height())) },
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palette().menu_selection());
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++i;
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}
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}
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static void get_cpu_usage(unsigned& busy, unsigned& idle)
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{
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busy = 0;
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idle = 0;
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auto all_processes = CProcessStatisticsReader::get_all();
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for (auto& it : all_processes) {
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for (auto& jt : it.value.threads) {
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if (it.value.pid == 0)
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idle += jt.times_scheduled;
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else
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busy += jt.times_scheduled;
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}
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}
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}
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CircularQueue<float, 30> m_cpu_history;
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unsigned m_last_busy { 0 };
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unsigned m_last_idle { 0 };
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};
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int main(int argc, char** argv)
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{
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if (pledge("stdio shared_buffer rpath unix cpath fattr", nullptr) < 0) {
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perror("pledge");
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return 1;
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}
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GApplication app(argc, argv);
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if (pledge("stdio shared_buffer rpath", nullptr) < 0) {
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perror("pledge");
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return 1;
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}
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auto window = GWindow::construct();
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window->set_window_type(GWindowType::MenuApplet);
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window->resize(30, 16);
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auto widget = GraphWidget::construct();
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window->set_main_widget(widget);
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window->show();
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return app.exec();
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}
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