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eventloop: move timers to an event loop fd

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fixes #5481
This commit is contained in:
Vaxry 2024-04-07 21:55:14 +01:00
parent c0d283016b
commit 863c7b6072
3 changed files with 61 additions and 128 deletions
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159
src/managers/eventLoop/EventLoopManager.cpp
View file

@ -2,139 +2,82 @@
#include "../../debug/Log.hpp"
#include <algorithm>
#include <limits>
#include <sys/poll.h>
#include <sys/timerfd.h>
#include <time.h>
#define TIMESPEC_NSEC_PER_SEC 1000000000L
CEventLoopManager::CEventLoopManager() {
m_sTimers.timerfd = timerfd_create(CLOCK_MONOTONIC, TFD_CLOEXEC);
}
static int timerWrite(int fd, uint32_t mask, void* data) {
g_pEventLoopManager->onTimerFire();
return 1;
}
void CEventLoopManager::enterLoop(wl_display* display, wl_event_loop* wlEventLoop) {
m_sWayland.loop = wlEventLoop;
m_sWayland.display = display;
pollfd pollfds[] = {
{
.fd = wl_event_loop_get_fd(wlEventLoop),
.events = POLLIN,
},
};
wl_event_loop_add_fd(wlEventLoop, m_sTimers.timerfd, WL_EVENT_READABLE, timerWrite, nullptr);
std::thread pollThr([this, &pollfds]() {
while (!m_bTerminate) {
int ret = poll(pollfds, 1, 5000 /* 5 seconds, reasonable. Just in case we need to terminate and the signal fails */);
wl_display_run(display);
if (ret < 0) {
if (errno == EINTR)
continue;
Debug::log(LOG, "Kicked off the event loop! :(");
}
Debug::log(CRIT, "Polling fds failed with {}", errno);
m_bTerminate = true;
return;
}
for (size_t i = 0; i < 1; ++i) {
if (pollfds[i].revents & POLLHUP) {
Debug::log(CRIT, "Disconnected from pollfd id {}", i);
m_bTerminate = true;
return;
}
}
if (ret != 0) {
{
std::lock_guard<std::mutex> lg2(m_sLoopState.eventRequestMutex);
std::lock_guard<std::mutex> lg(m_sLoopState.loopMutex);
m_sLoopState.event = true;
}
m_sLoopState.cv.notify_all();
}
}
});
std::thread timersThr([this]() {
while (!m_bTerminate) {
// calc nearest thing
m_sTimers.timersMutex.lock();
float least = 1000 * 1000 * 10; // 10s in µs
void CEventLoopManager::onTimerFire() {
for (auto& t : m_sTimers.timers) {
const auto TIME = std::clamp(t->leftUs(), 0.f, INFINITY);
if (TIME < least)
least = TIME;
}
m_sTimers.timersMutex.unlock();
if (least > 0) {
std::unique_lock lk(m_sTimers.timersRqMutex);
m_sTimers.cv.wait_for(lk, std::chrono::microseconds((int)least + 1), [this] { return m_sTimers.event; });
m_sTimers.event = false;
}
// notify main
{
std::lock_guard<std::mutex> lg2(m_sLoopState.eventRequestMutex);
std::lock_guard<std::mutex> lg(m_sLoopState.loopMutex);
m_sLoopState.event = true;
}
m_sLoopState.cv.notify_all();
}
});
m_sLoopState.event = true; // let it process once
while (1) {
std::unique_lock lk(m_sLoopState.eventRequestMutex);
m_sLoopState.cv.wait_for(lk, std::chrono::milliseconds(5000), [this] { return m_sLoopState.event; });
if (m_bTerminate)
break;
std::lock_guard<std::mutex> lg(m_sLoopState.loopMutex);
m_sLoopState.event = false;
if (pollfds[0].revents & POLLIN /* wl event loop */) {
wl_display_flush_clients(m_sWayland.display);
if (wl_event_loop_dispatch(m_sWayland.loop, -1) < 0) {
m_bTerminate = true;
break;
}
}
// TODO: don't check timers without the timer thread requesting it
// I tried but it didnt work :/
m_sTimers.timersMutex.lock();
auto timerscpy = m_sTimers.timers;
m_sTimers.timersMutex.unlock();
for (auto& t : timerscpy) {
if (t->passed() && !t->cancelled())
t->call(t);
}
if (m_bTerminate)
break;
}
Debug::log(LOG, "Kicked off the event loop! :(");
m_sTimers.event = true;
m_sTimers.cv.notify_all();
nudgeTimers();
}
void CEventLoopManager::addTimer(std::shared_ptr<CEventLoopTimer> timer) {
m_sTimers.timersMutex.lock();
m_sTimers.timers.push_back(timer);
m_sTimers.timersMutex.unlock();
nudgeTimers();
}
void CEventLoopManager::removeTimer(std::shared_ptr<CEventLoopTimer> timer) {
m_sTimers.timersMutex.lock();
std::erase_if(m_sTimers.timers, [timer](const auto& t) { return timer == t; });
m_sTimers.timersMutex.unlock();
nudgeTimers();
}
static void timespecAddNs(timespec* pTimespec, int64_t delta) {
int delta_ns_low = delta % TIMESPEC_NSEC_PER_SEC;
int delta_s_high = delta / TIMESPEC_NSEC_PER_SEC;
pTimespec->tv_sec += delta_s_high;
pTimespec->tv_nsec += (long)delta_ns_low;
if (pTimespec->tv_nsec >= TIMESPEC_NSEC_PER_SEC) {
pTimespec->tv_nsec -= TIMESPEC_NSEC_PER_SEC;
++pTimespec->tv_sec;
}
}
void CEventLoopManager::nudgeTimers() {
m_sTimers.event = true;
m_sTimers.cv.notify_all();
long nextTimerUs = 10 * 1000 * 1000; // 10s
for (auto& t : m_sTimers.timers) {
if (const auto 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_sTimers.timerfd, TFD_TIMER_ABSTIME, &ts, nullptr);
}

20
src/managers/eventLoop/EventLoopManager.hpp
View file

@ -10,10 +10,14 @@
class CEventLoopManager {
public:
CEventLoopManager();
void enterLoop(wl_display* display, wl_event_loop* wlEventLoop);
void addTimer(std::shared_ptr<CEventLoopTimer> timer);
void removeTimer(std::shared_ptr<CEventLoopTimer> timer);
void onTimerFire();
// recalculates timers
void nudgeTimers();
@ -21,26 +25,12 @@ class CEventLoopManager {
struct {
wl_event_loop* loop = nullptr;
wl_display* display = nullptr;
std::thread pollThread;
} m_sWayland;
struct {
std::mutex timersMutex;
std::mutex timersRqMutex;
std::vector<std::shared_ptr<CEventLoopTimer>> timers;
std::thread timerThread;
bool event = false;
std::condition_variable cv;
int timerfd = -1;
} m_sTimers;
struct {
std::mutex loopMutex;
std::mutex eventRequestMutex;
bool event = false;
std::condition_variable cv;
} m_sLoopState;
bool m_bTerminate = false;
};
inline std::unique_ptr<CEventLoopManager> g_pEventLoopManager;

2
src/managers/eventLoop/EventLoopTimer.cpp
View file

@ -1,5 +1,5 @@
#include "EventLoopTimer.hpp"
#include <numeric>
#include <limits>
#include "EventLoopManager.hpp"
CEventLoopTimer::CEventLoopTimer(std::optional<std::chrono::system_clock::duration> timeout, std::function<void(std::shared_ptr<CEventLoopTimer> self, void* data)> cb_,