mirror of https://github.com/Icinga/icinga2.git
99 lines
1.9 KiB
C++
99 lines
1.9 KiB
C++
/* Icinga 2 | (c) 2012 Icinga GmbH | GPLv2+ */
|
|
|
|
#ifndef THREADPOOL_H
|
|
#define THREADPOOL_H
|
|
|
|
#include "base/atomic.hpp"
|
|
#include "base/exception.hpp"
|
|
#include "base/logger.hpp"
|
|
#include <cstddef>
|
|
#include <exception>
|
|
#include <functional>
|
|
#include <memory>
|
|
#include <thread>
|
|
#include <boost/asio/post.hpp>
|
|
#include <boost/asio/thread_pool.hpp>
|
|
#include <boost/thread/locks.hpp>
|
|
#include <boost/thread/shared_mutex.hpp>
|
|
#include <cstdint>
|
|
|
|
namespace icinga
|
|
{
|
|
|
|
enum SchedulerPolicy
|
|
{
|
|
DefaultScheduler,
|
|
LowLatencyScheduler
|
|
};
|
|
|
|
/**
|
|
* A thread pool.
|
|
*
|
|
* @ingroup base
|
|
*/
|
|
class ThreadPool
|
|
{
|
|
public:
|
|
typedef std::function<void ()> WorkFunction;
|
|
|
|
ThreadPool(size_t threads = std::thread::hardware_concurrency() * 2u);
|
|
~ThreadPool();
|
|
|
|
void Start();
|
|
void Stop();
|
|
|
|
/**
|
|
* Appends a work item to the work queue. Work items will be processed in FIFO order.
|
|
*
|
|
* @param callback The callback function for the work item.
|
|
* @returns true if the item was queued, false otherwise.
|
|
*/
|
|
template<class T>
|
|
bool Post(T callback, SchedulerPolicy)
|
|
{
|
|
boost::shared_lock<decltype(m_Mutex)> lock (m_Mutex);
|
|
|
|
if (m_Pool) {
|
|
m_Pending.fetch_add(1);
|
|
|
|
boost::asio::post(*m_Pool, [this, callback]() {
|
|
m_Pending.fetch_sub(1);
|
|
|
|
try {
|
|
callback();
|
|
} catch (const std::exception& ex) {
|
|
Log(LogCritical, "ThreadPool")
|
|
<< "Exception thrown in event handler:\n"
|
|
<< DiagnosticInformation(ex);
|
|
} catch (...) {
|
|
Log(LogCritical, "ThreadPool", "Exception of unknown type thrown in event handler.");
|
|
}
|
|
});
|
|
|
|
return true;
|
|
} else {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Returns the amount of queued tasks not started yet.
|
|
*
|
|
* @returns amount of queued tasks.
|
|
*/
|
|
inline uint_fast64_t GetPending()
|
|
{
|
|
return m_Pending.load();
|
|
}
|
|
|
|
private:
|
|
boost::shared_mutex m_Mutex;
|
|
std::unique_ptr<boost::asio::thread_pool> m_Pool;
|
|
size_t m_Threads;
|
|
Atomic<uint_fast64_t> m_Pending;
|
|
};
|
|
|
|
}
|
|
|
|
#endif /* THREADPOOL_H */
|