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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#include "common.h"
#include "eventpipe.h"
#include "eventpipebuffer.h"
#include "eventpipebuffermanager.h"
#ifdef FEATURE_PERFTRACING
EventPipeThreadSessionState::EventPipeThreadSessionState(EventPipeThread* pThread, EventPipeSession* pSession DEBUG_ARG(EventPipeBufferManager* pBufferManager)) :
m_pThread(pThread),
m_pSession(pSession),
m_pWriteBuffer(nullptr),
m_pBufferList(nullptr),
#ifdef DEBUG
m_pBufferManager(pBufferManager),
#endif
m_sequenceNumber(1)
{
}
EventPipeThread* EventPipeThreadSessionState::GetThread()
{
LIMITED_METHOD_CONTRACT;
return m_pThread;
}
EventPipeSession* EventPipeThreadSessionState::GetSession()
{
LIMITED_METHOD_CONTRACT;
return m_pSession;
}
EventPipeBuffer *EventPipeThreadSessionState::GetWriteBuffer()
{
LIMITED_METHOD_CONTRACT;
_ASSERTE(m_pThread->IsLockOwnedByCurrentThread());
_ASSERTE((m_pWriteBuffer == nullptr) || (m_pWriteBuffer->GetVolatileState() == EventPipeBufferState::WRITABLE));
return m_pWriteBuffer;
}
void EventPipeThreadSessionState::SetWriteBuffer(EventPipeBuffer *pNewBuffer)
{
LIMITED_METHOD_CONTRACT;
_ASSERTE(m_pThread->IsLockOwnedByCurrentThread());
_ASSERTE((pNewBuffer == nullptr) || pNewBuffer->GetVolatileState() == EventPipeBufferState::WRITABLE);
_ASSERTE((m_pWriteBuffer == nullptr) || (m_pWriteBuffer->GetVolatileState() == EventPipeBufferState::WRITABLE));
if (m_pWriteBuffer != nullptr)
m_pWriteBuffer->ConvertToReadOnly();
m_pWriteBuffer = pNewBuffer;
}
EventPipeBufferList *EventPipeThreadSessionState::GetBufferList()
{
LIMITED_METHOD_CONTRACT;
_ASSERTE(m_pBufferManager->IsLockOwnedByCurrentThread());
return m_pBufferList;
}
void EventPipeThreadSessionState::SetBufferList(EventPipeBufferList *pNewBufferList)
{
LIMITED_METHOD_CONTRACT;
_ASSERTE(m_pBufferManager->IsLockOwnedByCurrentThread());
m_pBufferList = pNewBufferList;
}
unsigned int EventPipeThreadSessionState::GetVolatileSequenceNumber()
{
LIMITED_METHOD_CONTRACT;
return m_sequenceNumber.LoadWithoutBarrier();
}
unsigned int EventPipeThreadSessionState::GetSequenceNumber()
{
LIMITED_METHOD_CONTRACT;
_ASSERTE(m_pThread->IsLockOwnedByCurrentThread());
return m_sequenceNumber.LoadWithoutBarrier();
}
void EventPipeThreadSessionState::IncrementSequenceNumber()
{
LIMITED_METHOD_CONTRACT;
_ASSERTE(m_pThread->IsLockOwnedByCurrentThread());
m_sequenceNumber++;
}
void ReleaseEventPipeThreadRef(EventPipeThread *pThread)
{
LIMITED_METHOD_CONTRACT;
pThread->Release();
}
void AcquireEventPipeThreadRef(EventPipeThread *pThread)
{
LIMITED_METHOD_CONTRACT;
pThread->AddRef();
}
#ifndef __GNUC__
__declspec(thread)
#else // !__GNUC__
thread_local
#endif // !__GNUC__
EventPipeThreadHolder EventPipeThread::gCurrentEventPipeThreadHolder;
EventPipeThread::EventPipeThread()
{
CONTRACTL
{
THROWS;
GC_NOTRIGGER;
MODE_ANY;
}
CONTRACTL_END;
m_lock.Init(LOCK_TYPE_DEFAULT);
m_refCount = 0;
#ifdef FEATURE_PAL
m_osThreadId = ::PAL_GetCurrentOSThreadId();
#else
m_osThreadId = ::GetCurrentThreadId();
#endif
memset(m_sessionState, 0, sizeof(EventPipeThreadSessionState*) * EventPipe::MaxNumberOfSessions);
}
EventPipeThread::~EventPipeThread()
{
LIMITED_METHOD_CONTRACT;
#ifdef DEBUG
for (uint32_t i = 0; i < EventPipe::MaxNumberOfSessions; i++)
{
_ASSERTE(m_sessionState[i] == NULL);
}
#endif
}
/*static */ EventPipeThread *EventPipeThread::Get()
{
LIMITED_METHOD_CONTRACT;
return gCurrentEventPipeThreadHolder;
}
/*static */ EventPipeThread* EventPipeThread::GetOrCreate()
{
CONTRACTL
{
NOTHROW;
GC_NOTRIGGER;
MODE_ANY;
}
CONTRACTL_END;
if (gCurrentEventPipeThreadHolder == nullptr)
{
EX_TRY
{
gCurrentEventPipeThreadHolder = new EventPipeThread();
}
EX_CATCH
{
}
EX_END_CATCH(SwallowAllExceptions);
}
return gCurrentEventPipeThreadHolder;
}
void EventPipeThread::AddRef()
{
LIMITED_METHOD_CONTRACT;
FastInterlockIncrement(&m_refCount);
}
void EventPipeThread::Release()
{
LIMITED_METHOD_CONTRACT;
if (FastInterlockDecrement(&m_refCount) == 0)
{
// https://isocpp.org/wiki/faq/freestore-mgmt#delete-this
// As long as you're careful, it's okay (not evil) for an object to commit suicide (delete this).
delete this;
}
}
EventPipeThreadSessionState *EventPipeThread::GetOrCreateSessionState(EventPipeSession *pSession)
{
LIMITED_METHOD_CONTRACT;
PRECONDITION(pSession != nullptr);
PRECONDITION(pSession->GetIndex() < EventPipe::MaxNumberOfSessions);
PRECONDITION(IsLockOwnedByCurrentThread());
EventPipeThreadSessionState *pState = m_sessionState[pSession->GetIndex()];
if (pState == nullptr)
{
pState = new (nothrow) EventPipeThreadSessionState(this, pSession DEBUG_ARG(pSession->GetBufferManager()));
m_sessionState[pSession->GetIndex()] = pState;
}
return pState;
}
EventPipeThreadSessionState *EventPipeThread::GetSessionState(EventPipeSession *pSession)
{
LIMITED_METHOD_CONTRACT;
PRECONDITION(pSession != nullptr);
PRECONDITION(pSession->GetIndex() < EventPipe::MaxNumberOfSessions);
PRECONDITION(IsLockOwnedByCurrentThread());
EventPipeThreadSessionState *const pState = m_sessionState[pSession->GetIndex()];
_ASSERTE(pState != nullptr);
return pState;
}
void EventPipeThread::DeleteSessionState(EventPipeSession* pSession)
{
LIMITED_METHOD_CONTRACT;
_ASSERTE(pSession != nullptr);
_ASSERTE(IsLockOwnedByCurrentThread());
unsigned int index = pSession->GetIndex();
_ASSERTE(index < EventPipe::MaxNumberOfSessions);
EventPipeThreadSessionState* pState = m_sessionState[index];
_ASSERTE(pState != nullptr);
delete pState;
m_sessionState[index] = nullptr;
}
SpinLock* EventPipeThread::GetLock()
{
LIMITED_METHOD_CONTRACT;
return &m_lock;
}
#ifdef DEBUG
bool EventPipeThread::IsLockOwnedByCurrentThread()
{
LIMITED_METHOD_CONTRACT;
return m_lock.OwnedByCurrentThread();
}
#endif
SIZE_T EventPipeThread::GetOSThreadId()
{
LIMITED_METHOD_CONTRACT;
return m_osThreadId;
}
#endif // FEATURE_PERFTRACING
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