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#include <WindowServer/WSCPUMonitor.h>
#include <WindowServer/WSEventLoop.h>
#include <WindowServer/WSWindowManager.h>
#include <unistd.h>
#include <stdio.h>
WSCPUMonitor::WSCPUMonitor()
{
create_thread([] (void* context) -> int {
auto& monitor = *(WSCPUMonitor*)context;
for (;;) {
static unsigned last_busy;
static unsigned last_idle;
unsigned busy;
unsigned idle;
monitor.get_cpu_usage(busy, idle);
unsigned busy_diff = busy - last_busy;
unsigned idle_diff = idle - last_idle;
last_busy = busy;
last_idle = idle;
float cpu = (float)busy_diff / (float)(busy_diff + idle_diff);
monitor.m_cpu_history.enqueue(cpu);
monitor.m_dirty = true;
sleep(1);
}
}, this);
}
void WSCPUMonitor::get_cpu_usage(unsigned& busy, unsigned& idle)
{
busy = 0;
idle = 0;
FILE* fp = fopen("/proc/all", "r");
if (!fp) {
perror("failed to open /proc/all");
ASSERT_NOT_REACHED();
}
for (;;) {
char buf[BUFSIZ];
char* ptr = fgets(buf, sizeof(buf), fp);
if (!ptr)
break;
auto parts = String(buf, Chomp).split(',');
if (parts.size() < 17)
break;
bool ok;
pid_t pid = parts[0].to_uint(ok);
ASSERT(ok);
unsigned nsched = parts[1].to_uint(ok);
ASSERT(ok);
if (pid == 0)
idle += nsched;
else
busy += nsched;
}
int rc = fclose(fp);
ASSERT(rc == 0);
}
void WSCPUMonitor::paint(Painter& painter, const Rect& rect)
{
painter.fill_rect(rect, Color::Black);
int i = m_cpu_history.capacity() - m_cpu_history.size();
for (auto cpu_usage : m_cpu_history) {
painter.draw_line(
{ rect.x() + i, rect.bottom() },
{ rect.x() + i, (int)(rect.y() + (rect.height() - (cpu_usage * (float)rect.height()))) },
Color::from_rgb(0xaa6d4b)
);
++i;
}
}
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