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#pragma once
#include <optional>
#include <base/types.h>
#include <signal.h>
#include <time.h>
#include "clickhouse_config.h"
namespace Poco
{
class Logger;
}
namespace DB
{
/**
* Query profiler implementation for selected thread.
*
* This class installs timer and signal handler on creation to:
* 1. periodically pause given thread
* 2. collect thread's current stack trace
* 3. write collected stack trace to trace_pipe for TraceCollector
*
* Destructor tries to unset timer and restore previous signal handler.
* Note that signal handler implementation is defined by template parameter. See QueryProfilerReal and QueryProfilerCPU.
*/
#ifndef __APPLE__
class Timer
{
public:
Timer();
Timer(const Timer &) = delete;
Timer & operator = (const Timer &) = delete;
~Timer();
void createIfNecessary(UInt64 thread_id, int clock_type, int pause_signal);
void set(UInt32 period);
void stop();
void cleanup();
private:
Poco::Logger * log;
std::optional<timer_t> timer_id;
};
#endif
template <typename ProfilerImpl>
class QueryProfilerBase
{
public:
QueryProfilerBase(UInt64 thread_id, int clock_type, UInt32 period, int pause_signal_);
~QueryProfilerBase();
private:
void cleanup();
Poco::Logger * log;
#ifndef __APPLE__
inline static thread_local Timer timer = Timer();
#endif
/// Pause signal to interrupt threads to get traces
int pause_signal;
};
/// Query profiler with timer based on real clock
class QueryProfilerReal : public QueryProfilerBase<QueryProfilerReal>
{
public:
QueryProfilerReal(UInt64 thread_id, UInt32 period); /// NOLINT
static void signalHandler(int sig, siginfo_t * info, void * context);
};
/// Query profiler with timer based on CPU clock
class QueryProfilerCPU : public QueryProfilerBase<QueryProfilerCPU>
{
public:
QueryProfilerCPU(UInt64 thread_id, UInt32 period); /// NOLINT
static void signalHandler(int sig, siginfo_t * info, void * context);
};
}
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