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/*
* Copyright (C) 2003-2013 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include "Loop.hxx"
#ifdef USE_EPOLL
#include "system/Clock.hxx"
#include "TimeoutMonitor.hxx"
#include "SocketMonitor.hxx"
#include "IdleMonitor.hxx"
#include <algorithm>
EventLoop::EventLoop(Default)
:SocketMonitor(*this),
now_ms(::MonotonicClockMS()),
quit(false),
n_events(0),
thread(ThreadId::Null())
{
SocketMonitor::Open(wake_fd.Get());
SocketMonitor::Schedule(SocketMonitor::READ);
}
EventLoop::~EventLoop()
{
assert(idle.empty());
assert(timers.empty());
/* avoid closing the WakeFD twice */
SocketMonitor::Steal();
}
void
EventLoop::Break()
{
if (IsInside())
quit = true;
else
AddCall([this]() { Break(); });
}
bool
EventLoop::RemoveFD(int _fd, SocketMonitor &m)
{
for (unsigned i = 0, n = n_events; i < n; ++i)
if (events[i].data.ptr == &m)
events[i].events = 0;
return epoll.Remove(_fd);
}
void
EventLoop::AddIdle(IdleMonitor &i)
{
assert(std::find(idle.begin(), idle.end(), &i) == idle.end());
idle.push_back(&i);
}
void
EventLoop::RemoveIdle(IdleMonitor &i)
{
auto it = std::find(idle.begin(), idle.end(), &i);
assert(it != idle.end());
idle.erase(it);
}
void
EventLoop::AddTimer(TimeoutMonitor &t, unsigned ms)
{
timers.insert(TimerRecord(t, now_ms + ms));
}
void
EventLoop::CancelTimer(TimeoutMonitor &t)
{
for (auto i = timers.begin(), end = timers.end(); i != end; ++i) {
if (&i->timer == &t) {
timers.erase(i);
return;
}
}
}
#endif
void
EventLoop::Run()
{
assert(thread.IsNull());
thread = ThreadId::GetCurrent();
#ifdef USE_EPOLL
assert(!quit);
do {
now_ms = ::MonotonicClockMS();
/* invoke timers */
int timeout_ms;
while (true) {
auto i = timers.begin();
if (i == timers.end()) {
timeout_ms = -1;
break;
}
timeout_ms = i->due_ms - now_ms;
if (timeout_ms > 0)
break;
TimeoutMonitor &m = i->timer;
timers.erase(i);
m.Run();
if (quit)
return;
}
/* invoke idle */
const bool idle_empty = idle.empty();
while (!idle.empty()) {
IdleMonitor &m = *idle.front();
idle.pop_front();
m.Run();
if (quit)
return;
}
if (!idle_empty)
/* re-evaluate timers because one of the
IdleMonitors may have added a new
timeout */
continue;
/* wait for new event */
const int n = epoll.Wait(events, MAX_EVENTS, timeout_ms);
n_events = std::max(n, 0);
now_ms = ::MonotonicClockMS();
assert(!quit);
/* invoke sockets */
for (int i = 0; i < n; ++i) {
const auto &e = events[i];
if (e.events != 0) {
SocketMonitor &m = *(SocketMonitor *)e.data.ptr;
m.Dispatch(e.events);
if (quit)
break;
}
}
n_events = 0;
} while (!quit);
#else
g_main_loop_run(loop);
#endif
assert(thread.IsInside());
}
#ifdef USE_EPOLL
void
EventLoop::AddCall(std::function<void()> &&f)
{
mutex.lock();
calls.push_back(f);
mutex.unlock();
wake_fd.Write();
}
bool
EventLoop::OnSocketReady(gcc_unused unsigned flags)
{
assert(!quit);
wake_fd.Read();
mutex.lock();
while (!calls.empty() && !quit) {
auto f = std::move(calls.front());
calls.pop_front();
mutex.unlock();
f();
mutex.lock();
}
mutex.unlock();
return true;
}
#else
guint
EventLoop::AddIdle(GSourceFunc function, gpointer data)
{
GSource *source = g_idle_source_new();
g_source_set_callback(source, function, data, NULL);
guint id = g_source_attach(source, GetContext());
g_source_unref(source);
return id;
}
GSource *
EventLoop::AddTimeout(guint interval_ms,
GSourceFunc function, gpointer data)
{
GSource *source = g_timeout_source_new(interval_ms);
g_source_set_callback(source, function, data, nullptr);
g_source_attach(source, GetContext());
return source;
}
GSource *
EventLoop::AddTimeoutSeconds(guint interval_s,
GSourceFunc function, gpointer data)
{
GSource *source = g_timeout_source_new_seconds(interval_s);
g_source_set_callback(source, function, data, nullptr);
g_source_attach(source, GetContext());
return source;
}
#endif
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