30a0a7de43
This issue was raised by Brett Wilson while reviewing my changelist for readability. Craig Silverstein (one of C++ SG maintainers) confirmed that we should declare one namespace per line. Our way of namespaces closing seems not violating style guides (there is no clear agreement on it), so I left it intact. Review URL: http://codereview.chromium.org/115756 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@2038 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
133 lines
4.2 KiB
C++
133 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 {
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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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