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#include "EventLoopManager.hpp"
#include "../../debug/log/Logger.hpp"
#include "../../Compositor.hpp"
#include "../../config/ConfigWatcher.hpp"
#include <algorithm>
#include <limits>
#include <ranges>
#include <sys/timerfd.h>
#include <ctime>
#include <aquamarine/backend/Backend.hpp>
using namespace Hyprutils::OS;
#define TIMESPEC_NSEC_PER_SEC 1000000000L
CEventLoopManager::CEventLoopManager(wl_display* display, wl_event_loop* wlEventLoop) {
m_timers.timerfd = CFileDescriptor{timerfd_create(CLOCK_MONOTONIC, TFD_CLOEXEC)};
m_wayland.loop = wlEventLoop;
m_wayland.display = display;
}
CEventLoopManager::~CEventLoopManager() {
for (auto const& [_, eventSourceData] : m_aqEventSources) {
wl_event_source_remove(eventSourceData.eventSource);
}
for (auto const& w : m_readableWaiters) {
if (w->source != nullptr)
wl_event_source_remove(w->source);
}
if (m_wayland.eventSource)
wl_event_source_remove(m_wayland.eventSource);
if (m_idle.eventSource)
wl_event_source_remove(m_idle.eventSource);
if (m_configWatcherInotifySource)
wl_event_source_remove(m_configWatcherInotifySource);
}
static int timerWrite(int fd, uint32_t mask, void* data) {
g_pEventLoopManager->onTimerFire();
return 1;
}
static int aquamarineFDWrite(int fd, uint32_t mask, void* data) {
auto POLLFD = sc<Aquamarine::SPollFD*>(data);
POLLFD->onSignal();
return 1;
}
static int configWatcherWrite(int fd, uint32_t mask, void* data) {
g_pConfigWatcher->onInotifyEvent();
return 0;
}
static int handleWaiterFD(int fd, uint32_t mask, void* data) {
if (mask & (WL_EVENT_HANGUP | WL_EVENT_ERROR)) {
Log::logger->log(Log::ERR, "handleWaiterFD: readable waiter error");
return 0;
}
if (mask & WL_EVENT_READABLE)
g_pEventLoopManager->onFdReadable(sc<CEventLoopManager::SReadableWaiter*>(data));
return 0;
}
void CEventLoopManager::onFdReadable(SReadableWaiter* waiter) {
auto it = std::ranges::find_if(m_readableWaiters, [waiter](const UP<SReadableWaiter>& w) { return waiter == w.get() && w->fd == waiter->fd && w->source == waiter->source; });
// ???
if (it == m_readableWaiters.end())
return;
UP<SReadableWaiter> taken = std::move(*it);
m_readableWaiters.erase(it);
if (taken->fn)
taken->fn();
}
void CEventLoopManager::enterLoop() {
m_wayland.eventSource = wl_event_loop_add_fd(m_wayland.loop, m_timers.timerfd.get(), WL_EVENT_READABLE, timerWrite, nullptr);
if (const auto& FD = g_pConfigWatcher->getInotifyFD(); FD.isValid())
m_configWatcherInotifySource = wl_event_loop_add_fd(m_wayland.loop, FD.get(), WL_EVENT_READABLE, configWatcherWrite, nullptr);
syncPollFDs();
m_listeners.pollFDsChanged = g_pCompositor->m_aqBackend->events.pollFDsChanged.listen([this] { syncPollFDs(); });
// if we have a session, dispatch it to get the pending input devices
if (g_pCompositor->m_aqBackend->hasSession())
g_pCompositor->m_aqBackend->session->dispatchPendingEventsAsync();
wl_display_run(m_wayland.display);
Log::logger->log(Log::DEBUG, "Kicked off the event loop! :(");
}
void CEventLoopManager::onTimerFire() {
const auto CPY = m_timers.timers;
for (auto const& t : CPY) {
if (t.strongRef() > 2 /* if it's 2, it was lost. Don't call it. */ && t->passed() && !t->cancelled())
t->call(t);
}
scheduleRecalc();
}
void CEventLoopManager::addTimer(SP<CEventLoopTimer> timer) {
if (std::ranges::contains(m_timers.timers, timer))
return;
m_timers.timers.emplace_back(timer);
scheduleRecalc();
}
void CEventLoopManager::removeTimer(SP<CEventLoopTimer> timer) {
if (!std::ranges::contains(m_timers.timers, timer))
return;
std::erase_if(m_timers.timers, [timer](const auto& t) { return timer == t; });
scheduleRecalc();
}
static void timespecAddNs(timespec* pTimespec, int64_t delta) {
auto delta_ns_low = delta % TIMESPEC_NSEC_PER_SEC;
auto delta_s_high = delta / TIMESPEC_NSEC_PER_SEC;
pTimespec->tv_sec += delta_s_high;
pTimespec->tv_nsec += delta_ns_low;
if (pTimespec->tv_nsec >= TIMESPEC_NSEC_PER_SEC) {
pTimespec->tv_nsec -= TIMESPEC_NSEC_PER_SEC;
++pTimespec->tv_sec;
}
}
void CEventLoopManager::scheduleRecalc() {
// do not do it instantly, do it later. Avoid recursive access to the timer
// vector, it could be catastrophic if we modify it while iterating
if (m_timers.recalcScheduled)
return;
m_timers.recalcScheduled = true;
doLater([this] { nudgeTimers(); });
}
void CEventLoopManager::nudgeTimers() {
m_timers.recalcScheduled = false;
// remove timers that have gone missing
std::erase_if(m_timers.timers, [](const auto& t) { return t.strongRef() <= 1; });
long nextTimerUs = 10L * 1000 * 1000; // 10s
for (auto const& t : m_timers.timers) {
if (auto const& µs = t->leftUs(); µs < nextTimerUs)
nextTimerUs = µs;
}
nextTimerUs = std::clamp(nextTimerUs + 1, 1L, std::numeric_limits<long>::max());
timespec now;
clock_gettime(CLOCK_MONOTONIC, &now);
timespecAddNs(&now, nextTimerUs * 1000L);
itimerspec ts = {.it_value = now};
timerfd_settime(m_timers.timerfd.get(), TFD_TIMER_ABSTIME, &ts, nullptr);
}
void CEventLoopManager::doLater(const std::function<void()>& fn) {
m_idle.fns.emplace_back(fn);
if (m_idle.eventSource)
return;
m_idle.eventSource = wl_event_loop_add_idle(
m_wayland.loop,
[](void* data) {
auto IDLE = sc<CEventLoopManager::SIdleData*>(data);
auto cpy = IDLE->fns;
IDLE->fns.clear();
IDLE->eventSource = nullptr;
for (auto const& c : cpy) {
if (c)
c();
}
},
&m_idle);
}
void CEventLoopManager::doOnReadable(CFileDescriptor fd, std::function<void()>&& fn) {
if (!fd.isValid() || fd.isReadable()) {
fn();
return;
}
auto& waiter = m_readableWaiters.emplace_back(makeUnique<SReadableWaiter>(nullptr, std::move(fd), std::move(fn)));
waiter->source = wl_event_loop_add_fd(g_pEventLoopManager->m_wayland.loop, waiter->fd.get(), WL_EVENT_READABLE, ::handleWaiterFD, waiter.get());
}
void CEventLoopManager::syncPollFDs() {
auto aqPollFDs = g_pCompositor->m_aqBackend->getPollFDs();
std::erase_if(m_aqEventSources, [&](const auto& item) {
auto const& [fd, eventSourceData] = item;
// If no pollFD has the same fd, remove this event source
const bool shouldRemove = std::ranges::none_of(aqPollFDs, [&](const auto& pollFD) { return pollFD->fd == fd; });
if (shouldRemove)
wl_event_source_remove(eventSourceData.eventSource);
return shouldRemove;
});
for (auto& fd : aqPollFDs | std::views::filter([&](SP<Aquamarine::SPollFD> fd) { return !m_aqEventSources.contains(fd->fd); })) {
auto eventSource = wl_event_loop_add_fd(m_wayland.loop, fd->fd, WL_EVENT_READABLE, aquamarineFDWrite, fd.get());
m_aqEventSources[fd->fd] = {.pollFD = fd, .eventSource = eventSource};
}
}
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