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JsrtContext.cpp
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116 lines (100 loc) · 3.32 KB
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//-------------------------------------------------------------------------------------------------------
// Copyright (C) Microsoft. All rights reserved.
// Licensed under the MIT license. See LICENSE.txt file in the project root for full license information.
//-------------------------------------------------------------------------------------------------------
#include "JsrtPch.h"
#include "JsrtRuntime.h"
#include "Base/ThreadContextTlsEntry.h"
static THREAD_LOCAL JsrtContext* s_tlvSlot = nullptr;
JsrtContext::JsrtContext(JsrtRuntime * runtime) :
runtime(runtime), javascriptLibrary(nullptr)
{
}
void JsrtContext::SetJavascriptLibrary(Js::JavascriptLibrary * library)
{
this->javascriptLibrary = library;
if (this->javascriptLibrary)
{
this->javascriptLibrary->SetJsrtContext(this);
}
}
void JsrtContext::Link()
{
// Link this new JsrtContext up in the JsrtRuntime's context list
this->next = runtime->contextList;
this->previous = nullptr;
if (runtime->contextList != nullptr)
{
Assert(runtime->contextList->previous == nullptr);
runtime->contextList->previous = this;
}
runtime->contextList = this;
}
void JsrtContext::Unlink()
{
// Unlink from JsrtRuntime JsrtContext list
if (this->previous == nullptr)
{
// Have to check this because if we failed while creating, it might
// never have gotten linked in to the runtime at all.
if (this->runtime->contextList == this)
{
this->runtime->contextList = this->next;
}
}
else
{
Assert(this->previous->next == this);
this->previous->next = this->next;
}
if (this->next != nullptr)
{
Assert(this->next->previous == this);
this->next->previous = this->previous;
}
}
/* static */
JsrtContext * JsrtContext::GetCurrent()
{
return s_tlvSlot;
}
/* static */
bool JsrtContext::TrySetCurrent(JsrtContext * context)
{
ThreadContext * threadContext;
//We are not pinning the context after SetCurrentContext, so if the context is not pinned
//it might be reclaimed half way during execution. In jsrtshell the runtime was optimized out
//at time of JsrtContext::Run by the compiler.
//The change is to pin the context at setconcurrentcontext, and unpin the previous one. In
//JsDisposeRuntime we'll reject if current context is active, so that will make sure all
//contexts are unpinned at time of JsDisposeRuntime.
if (context != nullptr)
{
threadContext = context->GetScriptContext()->GetThreadContext();
if (!ThreadContextTLSEntry::TrySetThreadContext(threadContext))
{
return false;
}
// no need to rootAddRef and Release for the same context
if (s_tlvSlot == context) return true;
threadContext->GetRecycler()->RootAddRef((LPVOID)context);
}
else
{
if (!ThreadContextTLSEntry::ClearThreadContext(true))
{
return false;
}
}
JsrtContext* originalContext = s_tlvSlot;
if (originalContext != nullptr)
{
originalContext->GetScriptContext()->GetRecycler()->RootRelease((LPVOID) originalContext);
}
s_tlvSlot = context;
return true;
}
void JsrtContext::Mark(Recycler * recycler)
{
AssertMsg(false, "Mark called on object that isn't TrackableObject");
}