johnmccutchan@google.com
b3f2fb14d0
This CL does the following: - Introduces two new API entry points: Dart_IsolateBlocked and Dart_IsolateUnblocked. - The thread interrupter thread goes into a deep sleep if no isolates need to be profiled (not scheduled on a thread or are in a blocking call). - When an isolate unblocks, the thread interrupter thread resumes regular interrupts. - dart:io readLineSync and sleep mark that they are making a blocking call. This fixes https://code.google.com/p/dart/issues/detail?id=18126 reducing CPU usage to 0% when waiting for stdin or sleeping. R=ajohnsen@google.com, iposva@google.com Review URL: https://codereview.chromium.org//297183003 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@36632 260f80e4-7a28-3924-810f-c04153c831b5
101 lines
3.0 KiB
C++
101 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 callback will be
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// invoked. Each callback is given an InterruptedThreadState and the user data
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// pointer. When inside a 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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// State stored per registered thread.
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class InterruptableThreadState {
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public:
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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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class ThreadInterrupter : public AllStatic {
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public:
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static void InitOnce();
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static void Startup();
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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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// Wake up the thread interrupter thread.
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static void WakeUp();
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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 InterruptableThreadState* Register(ThreadInterruptCallback callback,
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void* data);
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// Unregister the currently running thread for interrupts.
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static void Unregister();
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// Get the current thread state. Will create a thread state if one hasn't
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// been allocated.
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static InterruptableThreadState* GetCurrentThreadState();
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// Get the current thread state. Will not create one if one doesn't exist.
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static InterruptableThreadState* CurrentThreadState();
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// Interrupt a thread.
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static void InterruptThread(InterruptableThreadState* thread_state);
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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 intptr_t current_wait_time_;
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static ThreadLocalKey thread_state_key_;
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static bool InDeepSleep() {
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return current_wait_time_ == Monitor::kNoTimeout;
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}
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static InterruptableThreadState* _EnsureThreadStateCreated();
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static void UpdateStateObject(ThreadInterruptCallback callback, void* data);
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static void SetCurrentThreadState(InterruptableThreadState* state);
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static void ThreadMain(uword parameters);
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static void InstallSignalHandler();
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friend class ThreadInterrupterVisitIsolates;
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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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