| // Copyright 2008 Google Inc. 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(); |
| |
| // Get data area for archiving a thread. |
| char* data() { return data_; } |
| private: |
| ThreadState(); |
| |
| void AllocateSpace(); |
| |
| 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 Iterate(ObjectVisitor* v); |
| static void MarkCompactPrologue(); |
| static void MarkCompactEpilogue(); |
| static bool IsLockedByCurrentThread() { return mutex_owner_.IsSelf(); } |
| private: |
| static void EagerlyArchiveThread(); |
| |
| static Mutex* mutex_; |
| static ThreadHandle mutex_owner_; |
| static ThreadHandle lazily_archived_thread_; |
| static ThreadState* lazily_archived_thread_state_; |
| }; |
| |
| |
| class ContextSwitcher: public Thread { |
| public: |
| void Run(); |
| static void StartPreemption(int every_n_ms); |
| static void StopPreemption(); |
| static void PreemptionReceived(); |
| private: |
| explicit ContextSwitcher(int every_n_ms); |
| void WaitForPreemption(); |
| void Stop(); |
| Semaphore* preemption_semaphore_; |
| bool keep_going_; |
| int sleep_ms_; |
| }; |
| |
| } } // namespace v8::internal |
| |
| #endif // V8_V8THREADS_H_ |