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#include <AK/CircularQueue.h>
#include <LibCore/CProcessStatisticsReader.h>
#include <LibDraw/Palette.h>
#include <LibGUI/GApplication.h>
#include <LibGUI/GPainter.h>
#include <LibGUI/GWidget.h>
#include <LibGUI/GWindow.h>
#include <stdio.h>
class GraphWidget final : public GWidget {
C_OBJECT(GraphWidget)
public:
GraphWidget()
: GWidget(nullptr)
{
start_timer(1000);
}
virtual ~GraphWidget() override {}
private:
virtual void timer_event(CTimerEvent&) override
{
unsigned busy;
unsigned idle;
get_cpu_usage(busy, idle);
unsigned busy_diff = busy - m_last_busy;
unsigned idle_diff = idle - m_last_idle;
m_last_busy = busy;
m_last_idle = idle;
float cpu = (float)busy_diff / (float)(busy_diff + idle_diff);
m_cpu_history.enqueue(cpu);
update();
}
virtual void paint_event(GPaintEvent& event) override
{
GPainter painter(*this);
painter.add_clip_rect(event.rect());
painter.fill_rect(event.rect(), Color::Black);
int i = m_cpu_history.capacity() - m_cpu_history.size();
for (auto cpu_usage : m_cpu_history) {
painter.draw_line(
{ i, rect().bottom() },
{ i, (int)(height() - (cpu_usage * (float)height())) },
palette().menu_selection());
++i;
}
}
static void get_cpu_usage(unsigned& busy, unsigned& idle)
{
busy = 0;
idle = 0;
auto all_processes = CProcessStatisticsReader::get_all();
for (auto& it : all_processes) {
for (auto& jt : it.value.threads) {
if (it.value.pid == 0)
idle += jt.times_scheduled;
else
busy += jt.times_scheduled;
}
}
}
CircularQueue<float, 30> m_cpu_history;
unsigned m_last_busy { 0 };
unsigned m_last_idle { 0 };
};
int main(int argc, char** argv)
{
if (pledge("stdio shared_buffer accept rpath unix cpath fattr", nullptr) < 0) {
perror("pledge");
return 1;
}
GApplication app(argc, argv);
if (pledge("stdio shared_buffer accept rpath", nullptr) < 0) {
perror("pledge");
return 1;
}
auto window = GWindow::construct();
window->set_window_type(GWindowType::MenuApplet);
window->resize(30, 16);
auto widget = GraphWidget::construct();
window->set_main_widget(widget);
window->show();
return app.exec();
}
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