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#pragma once
#include "event.h"
#include "preprocessor.h"
#include "rwspinlock.h"
#include "shuttle.h"
#include <util/datetime/cputimer.h>
#include <util/generic/hide_ptr.h>
#include <util/generic/scope.h>
#include <util/system/atomic.h>
namespace NLWTrace {
// Represents a chain (linked list) of steps for execution of a trace query block
// NOTE: different executor objects are used on different probes (even for the same query block)
class IExecutor {
private:
IExecutor* Next;
public:
IExecutor()
: Next(nullptr)
{
}
virtual ~IExecutor() {
if (Next != nullptr) {
delete Next;
}
}
void Execute(TOrbit& orbit, const TParams& params) {
if (DoExecute(orbit, params) && Next != nullptr) {
Next->Execute(orbit, params);
}
}
void SetNext(IExecutor* next) {
Next = next;
}
IExecutor* GetNext() {
return Next;
}
const IExecutor* GetNext() const {
return Next;
}
protected:
virtual bool DoExecute(TOrbit& orbit, const TParams& params) = 0;
};
// Common class for all probes
struct TProbe {
// Const configuration
TEvent Event;
// State that don't need any locking
TAtomic ExecutorsCount;
// State that must be accessed under lock
TRWSpinLock Lock;
IExecutor* Executors[LWTRACE_MAX_ACTIONS];
IExecutor** Front; // Invalid if ExecutorsCount == 0
IExecutor** Back; // Invalid if ExecutorsCount == 0
void Init() {
ExecutorsCount = 0;
Lock.Init();
Zero(Executors);
Front = nullptr;
Back = nullptr;
}
IExecutor** First() {
return Executors;
}
IExecutor** Last() {
return Executors + LWTRACE_MAX_ACTIONS;
}
void Inc(IExecutor**& it) {
it++;
if (it == Last()) {
it = First();
}
}
intptr_t GetExecutorsCount() const {
return AtomicGet(ExecutorsCount);
}
bool Attach(IExecutor* exec) {
TWriteSpinLockGuard g(Lock);
if (ExecutorsCount > 0) {
for (IExecutor** it = Front;; Inc(it)) {
if (*it == nullptr) {
*it = exec;
AtomicIncrement(ExecutorsCount);
return true; // Inserted into free slot in [First; Last]
}
if (it == Back) {
break;
}
}
IExecutor** newBack = Back;
Inc(newBack);
if (newBack == Front) {
return false; // Buffer is full
} else {
Back = newBack;
*Back = exec;
AtomicIncrement(ExecutorsCount);
return true; // Inserted after Last
}
} else {
Front = Back = First();
*Front = exec;
AtomicIncrement(ExecutorsCount);
return true; // Inserted as a first element
}
}
bool Detach(IExecutor* exec) {
TWriteSpinLockGuard g(Lock);
for (IExecutor** it = First(); it != Last(); it++) {
if ((*it) == exec) {
*it = nullptr;
AtomicDecrement(ExecutorsCount);
if (ExecutorsCount > 0) {
for (;; Inc(Front)) {
if (*Front != nullptr) {
break;
}
if (Front == Back) {
break;
}
}
}
return true;
}
}
return false;
}
void RunExecutors(TOrbit& orbit, const TParams& params) {
// Read lock is implied
if (ExecutorsCount > 0) {
for (IExecutor** it = Front;; Inc(it)) {
IExecutor* exec = *it;
if (exec) {
exec->Execute(orbit, params);
}
if (it == Back) {
break;
}
}
}
}
void RunShuttles(TOrbit& orbit, const TParams& params) {
orbit.AddProbe(this, params);
}
};
#ifndef LWTRACE_DISABLE
template <class T>
inline void PreparePtr(const T& ref, const T*& ptr) {
ptr = &ref;
}
template <>
inline void PreparePtr<TNil>(const TNil&, const TNil*&) {
}
#define LWTRACE_SCOPED_FUNCTION_PARAMS_I(i) (1) typename ::NLWTrace::TParamTraits<TP##i>::TFuncParam p##i = ERROR_not_enough_parameters() LWTRACE_COMMA
#define LWTRACE_SCOPED_FUNCTION_PARAMS LWTRACE_EXPAND(LWTRACE_EAT FOREACH_PARAMNUM(LWTRACE_SCOPED_FUNCTION_PARAMS_I)(0))
#define LWTRACE_SCOPED_FUNCTION_PARAMS_BY_REF_I(i) (1) typename ::NLWTrace::TParamTraits<TP##i>::TStoreType& p##i = *(ERROR_not_enough_parameters*)(HidePointerOrigin(nullptr))LWTRACE_COMMA
#define LWTRACE_SCOPED_FUNCTION_PARAMS_BY_REF LWTRACE_EXPAND(LWTRACE_EAT FOREACH_PARAMNUM(LWTRACE_SCOPED_FUNCTION_PARAMS_BY_REF_I)(0))
#define LWTRACE_SCOPED_PREPARE_PTRS_I(i) PreparePtr(p##i, P##i);
#define LWTRACE_SCOPED_PREPARE_PTRS() \
do { \
FOREACH_PARAMNUM(LWTRACE_SCOPED_PREPARE_PTRS_I) \
} while (false)
#define LWTRACE_SCOPED_PREPARE_PARAMS_I(i, params) params.Param[i].CopyConstruct<typename ::NLWTrace::TParamTraits<TP##i>::TStoreType>(*P##i);
#define LWTRACE_SCOPED_PREPARE_PARAMS(params) \
do { \
FOREACH_PARAMNUM(LWTRACE_SCOPED_PREPARE_PARAMS_I, params) \
} while (false)
template <LWTRACE_TEMPLATE_PARAMS>
struct TUserProbe;
template <LWTRACE_TEMPLATE_PARAMS>
class TScopedDurationImpl {
private:
TUserProbe<LWTRACE_TEMPLATE_ARGS>* Probe;
ui64 Started;
TParams Params;
public:
explicit TScopedDurationImpl(TUserProbe<LWTRACE_TEMPLATE_ARGS>& probe, LWTRACE_SCOPED_FUNCTION_PARAMS) {
if (probe.Probe.GetExecutorsCount() > 0) {
Probe = &probe;
LWTRACE_PREPARE_PARAMS(Params);
Started = GetCycleCount();
} else {
Probe = nullptr;
}
}
~TScopedDurationImpl() {
if (Probe) {
if (Probe->Probe.GetExecutorsCount() > 0) {
TReadSpinLockGuard g(Probe->Probe.Lock);
if (Probe->Probe.GetExecutorsCount() > 0) {
ui64 duration = CyclesToDuration(GetCycleCount() - Started).MicroSeconds();
Params.Param[0].template CopyConstruct<typename TParamTraits<TP0>::TStoreType>(duration);
TOrbit orbit;
Probe->Probe.RunExecutors(orbit, Params);
}
}
TUserSignature<LWTRACE_TEMPLATE_ARGS>::DestroyParams(Params);
}
}
};
// Class representing a specific probe
template <LWTRACE_TEMPLATE_PARAMS_NODEF>
struct TUserProbe {
TProbe Probe;
inline void operator()(LWTRACE_FUNCTION_PARAMS) {
TParams params;
LWTRACE_PREPARE_PARAMS(params);
Y_DEFER { TUserSignature<LWTRACE_TEMPLATE_ARGS>::DestroyParams(params); };
TOrbit orbit;
Probe.RunExecutors(orbit, params);
}
inline void Run(TOrbit& orbit, LWTRACE_FUNCTION_PARAMS) {
TParams params;
LWTRACE_PREPARE_PARAMS(params);
Y_DEFER { TUserSignature<LWTRACE_TEMPLATE_ARGS>::DestroyParams(params); };
Probe.RunExecutors(orbit, params);
Probe.RunShuttles(orbit, params); // Executors can create shuttles
}
// Required to avoid running executors w/o lock
inline void RunShuttles(TOrbit& orbit, LWTRACE_FUNCTION_PARAMS) {
TParams params;
LWTRACE_PREPARE_PARAMS(params);
Probe.RunShuttles(orbit, params);
TUserSignature<LWTRACE_TEMPLATE_ARGS>::DestroyParams(params);
}
typedef TScopedDurationImpl<LWTRACE_TEMPLATE_ARGS> TScopedDuration;
};
#endif
}
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