johnmccutchan@google.com
919dc2d6eb
* Threads can only register and unregister themselves with ThreadInterrupter. * Profiler is no longer involved in interrupting threads. It's just a callback and the buffer. * Profiler operates lock free using an atomic operation to reserve sample in sample buffer. * Linux, Mac, and Windows done. R=asiva@google.com Review URL: https://codereview.chromium.org//109803002 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@31170 260f80e4-7a28-3924-810f-c04153c831b5
100 lines
3.0 KiB
C++
100 lines
3.0 KiB
C++
// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#ifndef VM_THREAD_INTERRUPTER_H_
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#define VM_THREAD_INTERRUPTER_H_
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#include "vm/allocation.h"
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#include "vm/signal_handler.h"
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#include "vm/thread.h"
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namespace dart {
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struct InterruptedThreadState {
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ThreadId tid;
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uintptr_t pc;
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uintptr_t sp;
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uintptr_t fp;
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};
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// When a thread is interrupted the thread specific interrupt
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// callback will be invoked at the interrupt period. Each callback is given an
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// InterruptedThreadState and the thread specific data pointer. When inside a
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// thread interrupt callback doing any of the following
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// is forbidden:
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// * Accessing TLS.
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// * Allocating memory.
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// * Taking a lock.
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typedef void (*ThreadInterruptCallback)(const InterruptedThreadState& state,
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void* data);
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class ThreadInterrupter : public AllStatic {
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public:
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static void InitOnce();
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static void Shutdown();
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// Delay between interrupts.
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static void SetInterruptPeriod(intptr_t period);
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// Register the currently running thread for interrupts. If the current thread
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// is already registered, callback and data will be updated.
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static void Register(ThreadInterruptCallback callback, void* data);
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// Unregister the currently running thread for interrupts.
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static void Unregister();
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// Enable interrupts for this thread. Does not alter callback.
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static void Enable();
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// Disable interrupts for this thread. Does not alter callback.
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static void Disable();
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private:
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static const intptr_t kMaxThreads = 4096;
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static bool initialized_;
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static bool shutdown_;
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static bool thread_running_;
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static ThreadId interrupter_thread_id_;
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static Monitor* monitor_;
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static intptr_t interrupt_period_;
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static ThreadLocalKey thread_state_key_;
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// State stored per registered thread.
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struct ThreadState {
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ThreadId id;
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ThreadInterruptCallback callback;
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void* data;
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};
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static void UpdateStateObject(ThreadInterruptCallback callback, void* data);
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static ThreadState* CurrentThreadState();
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static void SetCurrentThreadState(ThreadState* state);
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// Registered thread table.
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static ThreadState** threads_;
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static intptr_t threads_capacity_;
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static intptr_t threads_size_;
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static void _EnsureThreadStateCreated();
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static void _Enable();
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static void _Disable();
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static void ResizeThreads(intptr_t new_capacity);
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static void AddThread(ThreadId id);
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static intptr_t FindThreadIndex(ThreadId id);
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static ThreadState* RemoveThread(intptr_t i);
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friend class ThreadInterrupterAndroid;
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friend class ThreadInterrupterMacOS;
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friend class ThreadInterrupterLinux;
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friend class ThreadInterrupterWin;
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static void InterruptThreads(int64_t current_time);
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static void ThreadMain(uword parameters);
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static void InstallSignalHandler();
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};
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void ThreadInterruptNoOp(const InterruptedThreadState& state, void* data);
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} // namespace dart
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#endif // VM_THREAD_INTERRUPTER_H_
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