1 // Copyright 2012 the V8 project authors. All rights reserved. 2 // Redistribution and use in source and binary forms, with or without 3 // modification, are permitted provided that the following conditions are 4 // met: 5 // 6 // * Redistributions of source code must retain the above copyright 7 // notice, this list of conditions and the following disclaimer. 8 // * Redistributions in binary form must reproduce the above 9 // copyright notice, this list of conditions and the following 10 // disclaimer in the documentation and/or other materials provided 11 // with the distribution. 12 // * Neither the name of Google Inc. nor the names of its 13 // contributors may be used to endorse or promote products derived 14 // from this software without specific prior written permission. 15 // 16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 28 #ifndef V8_V8THREADS_H_ 29 #define V8_V8THREADS_H_ 30 31 namespace v8 { 32 namespace internal { 33 34 35 class ThreadState { 36 public: 37 // Returns NULL after the last one. 38 ThreadState* Next(); 39 40 enum List {FREE_LIST, IN_USE_LIST}; 41 42 void LinkInto(List list); 43 void Unlink(); 44 45 // Id of thread. set_id(ThreadId id)46 void set_id(ThreadId id) { id_ = id; } id()47 ThreadId id() { return id_; } 48 49 // Should the thread be terminated when it is restored? terminate_on_restore()50 bool terminate_on_restore() { return terminate_on_restore_; } set_terminate_on_restore(bool terminate_on_restore)51 void set_terminate_on_restore(bool terminate_on_restore) { 52 terminate_on_restore_ = terminate_on_restore; 53 } 54 55 // Get data area for archiving a thread. data()56 char* data() { return data_; } 57 58 private: 59 explicit ThreadState(ThreadManager* thread_manager); 60 ~ThreadState(); 61 62 void AllocateSpace(); 63 64 ThreadId id_; 65 bool terminate_on_restore_; 66 char* data_; 67 ThreadState* next_; 68 ThreadState* previous_; 69 70 ThreadManager* thread_manager_; 71 72 friend class ThreadManager; 73 }; 74 75 76 // Defined in isolate.h. 77 class ThreadLocalTop; 78 79 80 class ThreadVisitor { 81 public: 82 // ThreadLocalTop may be only available during this call. 83 virtual void VisitThread(Isolate* isolate, ThreadLocalTop* top) = 0; 84 85 protected: ~ThreadVisitor()86 virtual ~ThreadVisitor() {} 87 }; 88 89 90 class ThreadManager { 91 public: 92 void Lock(); 93 void Unlock(); 94 95 void ArchiveThread(); 96 bool RestoreThread(); 97 void FreeThreadResources(); 98 bool IsArchived(); 99 100 void Iterate(ObjectVisitor* v); 101 void IterateArchivedThreads(ThreadVisitor* v); IsLockedByCurrentThread()102 bool IsLockedByCurrentThread() { 103 return mutex_owner_.Equals(ThreadId::Current()); 104 } 105 106 ThreadId CurrentId(); 107 108 void TerminateExecution(ThreadId thread_id); 109 110 // Iterate over in-use states. 111 ThreadState* FirstThreadStateInUse(); 112 ThreadState* GetFreeThreadState(); 113 114 private: 115 ThreadManager(); 116 ~ThreadManager(); 117 118 void DeleteThreadStateList(ThreadState* anchor); 119 120 void EagerlyArchiveThread(); 121 122 Mutex mutex_; 123 ThreadId mutex_owner_; 124 ThreadId lazily_archived_thread_; 125 ThreadState* lazily_archived_thread_state_; 126 127 // In the following two lists there is always at least one object on the list. 128 // The first object is a flying anchor that is only there to simplify linking 129 // and unlinking. 130 // Head of linked list of free states. 131 ThreadState* free_anchor_; 132 // Head of linked list of states in use. 133 ThreadState* in_use_anchor_; 134 135 Isolate* isolate_; 136 137 friend class Isolate; 138 friend class ThreadState; 139 }; 140 141 142 } } // namespace v8::internal 143 144 #endif // V8_V8THREADS_H_ 145