Move V8 to external/v8
Change-Id: If68025d67453785a651c5dfb34fad298c16676a4
diff --git a/src/v8threads.h b/src/v8threads.h
new file mode 100644
index 0000000..0684053
--- /dev/null
+++ b/src/v8threads.h
@@ -0,0 +1,144 @@
+// Copyright 2008 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following
+// disclaimer in the documentation and/or other materials provided
+// with the distribution.
+// * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived
+// from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef V8_V8THREADS_H_
+#define V8_V8THREADS_H_
+
+namespace v8 {
+namespace internal {
+
+
+class ThreadState {
+ public:
+ // Iterate over in-use states.
+ static ThreadState* FirstInUse();
+ // Returns NULL after the last one.
+ ThreadState* Next();
+
+ enum List {FREE_LIST, IN_USE_LIST};
+
+ void LinkInto(List list);
+ void Unlink();
+
+ static ThreadState* GetFree();
+
+ // Id of thread.
+ void set_id(int id) { id_ = id; }
+ int id() { return id_; }
+
+ // Should the thread be terminated when it is restored?
+ bool terminate_on_restore() { return terminate_on_restore_; }
+ void set_terminate_on_restore(bool terminate_on_restore) {
+ terminate_on_restore_ = terminate_on_restore;
+ }
+
+ // Get data area for archiving a thread.
+ char* data() { return data_; }
+ private:
+ ThreadState();
+
+ void AllocateSpace();
+
+ int id_;
+ bool terminate_on_restore_;
+ char* data_;
+ ThreadState* next_;
+ ThreadState* previous_;
+
+ // In the following two lists there is always at least one object on the list.
+ // The first object is a flying anchor that is only there to simplify linking
+ // and unlinking.
+ // Head of linked list of free states.
+ static ThreadState* free_anchor_;
+ // Head of linked list of states in use.
+ static ThreadState* in_use_anchor_;
+};
+
+
+class ThreadManager : public AllStatic {
+ public:
+ static void Lock();
+ static void Unlock();
+
+ static void ArchiveThread();
+ static bool RestoreThread();
+ static void FreeThreadResources();
+ static bool IsArchived();
+
+ static void Iterate(ObjectVisitor* v);
+ static void MarkCompactPrologue(bool is_compacting);
+ static void MarkCompactEpilogue(bool is_compacting);
+ static bool IsLockedByCurrentThread() { return mutex_owner_.IsSelf(); }
+
+ static int CurrentId();
+ static void AssignId();
+ static bool HasId();
+
+ static void TerminateExecution(int thread_id);
+
+ static const int kInvalidId = -1;
+ private:
+ static void EagerlyArchiveThread();
+
+ static int last_id_; // V8 threads are identified through an integer.
+ static Mutex* mutex_;
+ static ThreadHandle mutex_owner_;
+ static ThreadHandle lazily_archived_thread_;
+ static ThreadState* lazily_archived_thread_state_;
+};
+
+
+// The ContextSwitcher thread is used to schedule regular preemptions to
+// multiple running V8 threads. Generally it is necessary to call
+// StartPreemption if there is more than one thread running. If not, a single
+// JavaScript can take full control of V8 and not allow other threads to run.
+class ContextSwitcher: public Thread {
+ public:
+ // Set the preemption interval for the ContextSwitcher thread.
+ static void StartPreemption(int every_n_ms);
+
+ // Stop sending preemption requests to threads.
+ static void StopPreemption();
+
+ // Preempted thread needs to call back to the ContextSwitcher to acknowledge
+ // the handling of a preemption request.
+ static void PreemptionReceived();
+
+ private:
+ explicit ContextSwitcher(int every_n_ms);
+
+ void Run();
+
+ bool keep_going_;
+ int sleep_ms_;
+
+ static ContextSwitcher* singleton_;
+};
+
+} } // namespace v8::internal
+
+#endif // V8_V8THREADS_H_