37d7dcd20c
Each thread running V8 code is assigned an id in thread local storage the first time V8 code is run in it. The thread information returned to the debugger contains the number of threads, the id of each of these threads and which one is the current thread. Added a threads command to the developer shell debugger for showing information on threads. Review URL: http://codereview.chromium.org/48009 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@1523 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
132 lines
4.2 KiB
C++
132 lines
4.2 KiB
C++
// Copyright 2008 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#ifndef V8_V8THREADS_H_
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#define V8_V8THREADS_H_
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namespace v8 { namespace internal {
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class ThreadState {
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public:
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// Iterate over in-use states.
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static ThreadState* FirstInUse();
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// Returns NULL after the last one.
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ThreadState* Next();
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enum List {FREE_LIST, IN_USE_LIST};
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void LinkInto(List list);
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void Unlink();
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static ThreadState* GetFree();
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// Id of thread.
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void set_id(int id) { id_ = id; }
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int id() { return id_; }
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// Get data area for archiving a thread.
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char* data() { return data_; }
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private:
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ThreadState();
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void AllocateSpace();
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int id_;
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char* data_;
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ThreadState* next_;
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ThreadState* previous_;
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// In the following two lists there is always at least one object on the list.
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// The first object is a flying anchor that is only there to simplify linking
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// and unlinking.
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// Head of linked list of free states.
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static ThreadState* free_anchor_;
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// Head of linked list of states in use.
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static ThreadState* in_use_anchor_;
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};
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class ThreadManager : public AllStatic {
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public:
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static void Lock();
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static void Unlock();
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static void ArchiveThread();
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static bool RestoreThread();
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static void Iterate(ObjectVisitor* v);
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static void MarkCompactPrologue(bool is_compacting);
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static void MarkCompactEpilogue(bool is_compacting);
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static bool IsLockedByCurrentThread() { return mutex_owner_.IsSelf(); }
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static int CurrentId();
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static void AssignId();
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static const int kInvalidId = -1;
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private:
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static void EagerlyArchiveThread();
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static int next_id_; // V8 threads are identified through an integer.
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static Mutex* mutex_;
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static ThreadHandle mutex_owner_;
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static ThreadHandle lazily_archived_thread_;
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static ThreadState* lazily_archived_thread_state_;
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};
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// The ContextSwitcher thread is used to schedule regular preemptions to
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// multiple running V8 threads. Generally it is necessary to call
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// StartPreemption if there is more than one thread running. If not, a single
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// JavaScript can take full control of V8 and not allow other threads to run.
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class ContextSwitcher: public Thread {
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public:
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// Set the preemption interval for the ContextSwitcher thread.
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static void StartPreemption(int every_n_ms);
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// Stop sending preemption requests to threads.
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static void StopPreemption();
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// Preempted thread needs to call back to the ContextSwitcher to acknowledge
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// the handling of a preemption request.
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static void PreemptionReceived();
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private:
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explicit ContextSwitcher(int every_n_ms);
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void Run();
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bool keep_going_;
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int sleep_ms_;
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static ContextSwitcher* singleton_;
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};
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} } // namespace v8::internal
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#endif // V8_V8THREADS_H_
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