koda@google.com
c042387868
Since the Thread structure is currently cleared on Enter/ExitIsolate, there is a risk that CHA is cleared if an embedder callback executes during compilation and switches/spawns isolates. This CL eliminates that risk. However, Isolate is still not a good long-term place for CHA, since it doesn't fit with a concurrent compilation model. Issue 23153 tracks the work towards a permanent solution that couples its life cycle with compilation. R=fschneider@google.com, iposva@google.com Review URL: https://codereview.chromium.org//1061243003 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@45121 260f80e4-7a28-3924-810f-c04153c831b5
70 lines
1.9 KiB
C++
70 lines
1.9 KiB
C++
// Copyright (c) 2015, the Dart project authors. Please see the AUTHORS file
|
|
// for details. All rights reserved. Use of this source code is governed by a
|
|
// BSD-style license that can be found in the LICENSE file.
|
|
|
|
#ifndef VM_THREAD_H_
|
|
#define VM_THREAD_H_
|
|
|
|
#include "vm/base_isolate.h"
|
|
#include "vm/globals.h"
|
|
#include "vm/os_thread.h"
|
|
|
|
namespace dart {
|
|
|
|
class CHA;
|
|
class Isolate;
|
|
|
|
// A VM thread; may be executing Dart code or performing helper tasks like
|
|
// garbage collection or compilation. The Thread structure associated with
|
|
// a thread is allocated when the thread enters an isolate, and destroyed
|
|
// upon exiting an isolate or an explicit call to CleanUp.
|
|
class Thread {
|
|
public:
|
|
// The currently executing thread, or NULL if not yet initialized.
|
|
static Thread* Current() {
|
|
return reinterpret_cast<Thread*>(OSThread::GetThreadLocal(thread_key_));
|
|
}
|
|
|
|
// Makes the current thread enter 'isolate'. Also calls EnsureInit.
|
|
static void EnterIsolate(Isolate* isolate);
|
|
// Makes the current thread exit its isolate. Also calls CleanUp.
|
|
static void ExitIsolate();
|
|
|
|
// Initializes the current thread as a VM thread, if not already done.
|
|
static void EnsureInit();
|
|
// Clears the state of the current thread.
|
|
static void CleanUp();
|
|
|
|
// Called at VM startup.
|
|
static void InitOnce();
|
|
|
|
// The topmost zone used for allocation in this thread.
|
|
Zone* zone() {
|
|
return reinterpret_cast<BaseIsolate*>(isolate())->current_zone();
|
|
}
|
|
|
|
// The isolate that this thread is operating on, or NULL if none.
|
|
Isolate* isolate() const { return isolate_; }
|
|
|
|
// The (topmost) CHA for the compilation in the isolate of this thread.
|
|
// TODO(23153): Move this out of Isolate/Thread.
|
|
CHA* cha() const;
|
|
void set_cha(CHA* value);
|
|
|
|
private:
|
|
static ThreadLocalKey thread_key_;
|
|
|
|
Isolate* isolate_;
|
|
|
|
Thread()
|
|
: isolate_(NULL) {}
|
|
|
|
static void SetCurrent(Thread* current);
|
|
|
|
DISALLOW_COPY_AND_ASSIGN(Thread);
|
|
};
|
|
|
|
} // namespace dart
|
|
|
|
#endif // VM_THREAD_H_
|