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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef mozilla_ThreadStackHelper_h
#define mozilla_ThreadStackHelper_h
#include "mozilla/ThreadHangStats.h"
#include "GeckoProfiler.h"
#include <stddef.h>
#if defined(XP_LINUX)
#include <signal.h>
#include <semaphore.h>
#include <sys/types.h>
#elif defined(XP_WIN)
#include <windows.h>
#elif defined(XP_MACOSX)
#include <mach/mach.h>
#endif
namespace mozilla {
/**
* ThreadStackHelper is used to retrieve the profiler pseudo-stack of a
* thread, as an alternative of using the profiler to take a profile.
* The target thread first declares an ThreadStackHelper instance;
* then another thread can call ThreadStackHelper::GetStack to retrieve
* the pseudo-stack of the target thread at that instant.
*
* Only non-copying labels are included in the stack, which means labels
* with custom text and markers are not included.
*/
class ThreadStackHelper
{
public:
typedef Telemetry::HangStack Stack;
private:
Stack* mStackToFill;
bool PrepareStackBuffer(Stack& aStack);
void FillStackBuffer();
void FillThreadContext(void* aContext = nullptr);
public:
/**
* Initialize ThreadStackHelper. Must be called from main thread.
*/
static void Startup();
/**
* Uninitialize ThreadStackHelper. Must be called from main thread.
*/
static void Shutdown();
/**
* Create a ThreadStackHelper instance targeting the current thread.
*/
ThreadStackHelper();
~ThreadStackHelper();
/**
* Retrieve the current pseudostack of the thread associated
* with this ThreadStackHelper.
*
* @param aStack Stack instance to be filled.
*/
void GetStack(Stack& aStack);
/**
* Retrieve the current native stack of the thread associated
* with this ThreadStackHelper.
*
* @param aNativeStack Stack instance to be filled.
*/
void GetNativeStack(Stack& aStack);
#if defined(XP_LINUX)
private:
static int sInitialized;
static int sFillStackSignum;
static void FillStackHandler(int aSignal, siginfo_t* aInfo, void* aContext);
sem_t mSem;
pid_t mThreadID;
#elif defined(XP_WIN)
private:
bool mInitialized;
HANDLE mThreadID;
#elif defined(XP_MACOSX)
private:
thread_act_t mThreadID;
#endif
};
} // namespace mozilla
#endif // mozilla_ThreadStackHelper_h
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