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/* Icinga 2 | (c) 2012 Icinga GmbH | GPLv2+ */
#include "base/configuration.hpp"
#include "base/exception.hpp"
#include "base/io-engine.hpp"
#include "base/lazy-init.hpp"
#include "base/logger.hpp"
#include <exception>
#include <memory>
#include <thread>
#include <boost/asio/io_context.hpp>
#include <boost/asio/spawn.hpp>
#include <boost/asio/post.hpp>
#include <boost/date_time/posix_time/ptime.hpp>
#include <boost/system/error_code.hpp>
using namespace icinga;
CpuBoundWork::CpuBoundWork(boost::asio::yield_context yc)
: m_Done(false)
{
auto& ioEngine (IoEngine::Get());
for (;;) {
auto availableSlots (ioEngine.m_CpuBoundSemaphore.fetch_sub(1));
if (availableSlots < 1) {
ioEngine.m_CpuBoundSemaphore.fetch_add(1);
IoEngine::YieldCurrentCoroutine(yc);
continue;
}
break;
}
}
CpuBoundWork::~CpuBoundWork()
{
if (!m_Done) {
IoEngine::Get().m_CpuBoundSemaphore.fetch_add(1);
}
}
void CpuBoundWork::Done()
{
if (!m_Done) {
IoEngine::Get().m_CpuBoundSemaphore.fetch_add(1);
m_Done = true;
}
}
IoBoundWorkSlot::IoBoundWorkSlot(boost::asio::yield_context yc)
: yc(yc)
{
IoEngine::Get().m_CpuBoundSemaphore.fetch_add(1);
}
IoBoundWorkSlot::~IoBoundWorkSlot()
{
auto& ioEngine (IoEngine::Get());
for (;;) {
auto availableSlots (ioEngine.m_CpuBoundSemaphore.fetch_sub(1));
if (availableSlots < 1) {
ioEngine.m_CpuBoundSemaphore.fetch_add(1);
IoEngine::YieldCurrentCoroutine(yc);
continue;
}
break;
}
}
LazyInit<std::unique_ptr<IoEngine>> IoEngine::m_Instance ([]() { return std::unique_ptr<IoEngine>(new IoEngine()); });
IoEngine& IoEngine::Get()
{
return *m_Instance.Get();
}
boost::asio::io_context& IoEngine::GetIoContext()
{
return m_IoContext;
}
IoEngine::IoEngine() : m_IoContext(), m_KeepAlive(boost::asio::make_work_guard(m_IoContext)), m_Threads(decltype(m_Threads)::size_type(Configuration::Concurrency * 2u)), m_AlreadyExpiredTimer(m_IoContext)
{
m_AlreadyExpiredTimer.expires_at(boost::posix_time::neg_infin);
m_CpuBoundSemaphore.store(Configuration::Concurrency * 3u / 2u);
for (auto& thread : m_Threads) {
thread = std::thread(&IoEngine::RunEventLoop, this);
}
}
IoEngine::~IoEngine()
{
for (auto& thread : m_Threads) {
boost::asio::post(m_IoContext, []() {
throw TerminateIoThread();
});
}
for (auto& thread : m_Threads) {
thread.join();
}
}
void IoEngine::RunEventLoop()
{
for (;;) {
try {
m_IoContext.run();
break;
} catch (const TerminateIoThread&) {
break;
} catch (const std::exception& e) {
Log(LogCritical, "IoEngine", "Exception during I/O operation!");
Log(LogDebug, "IoEngine") << "Exception during I/O operation: " << DiagnosticInformation(e);
}
}
}
AsioEvent::AsioEvent(boost::asio::io_context& io, bool init)
: m_Timer(io)
{
m_Timer.expires_at(init ? boost::posix_time::neg_infin : boost::posix_time::pos_infin);
}
void AsioEvent::Set()
{
m_Timer.expires_at(boost::posix_time::neg_infin);
}
void AsioEvent::Clear()
{
m_Timer.expires_at(boost::posix_time::pos_infin);
}
void AsioEvent::Wait(boost::asio::yield_context yc)
{
boost::system::error_code ec;
m_Timer.async_wait(yc[ec]);
}
AsioDualEvent::AsioDualEvent(boost::asio::io_context& io, bool init)
: m_IsTrue(io, init), m_IsFalse(io, !init)
{
}
void AsioDualEvent::Set()
{
m_IsTrue.Set();
m_IsFalse.Clear();
}
void AsioDualEvent::Clear()
{
m_IsTrue.Clear();
m_IsFalse.Set();
}
void AsioDualEvent::WaitForSet(boost::asio::yield_context yc)
{
m_IsTrue.Wait(std::move(yc));
}
void AsioDualEvent::WaitForClear(boost::asio::yield_context yc)
{
m_IsFalse.Wait(std::move(yc));
}
/**
* Cancels any pending timeout callback.
*
* Must be called in the strand in which the callback was scheduled!
*/
void Timeout::Cancel()
{
m_Cancelled->store(true);
boost::system::error_code ec;
m_Timer.cancel(ec);
}
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