1 // Copyright 2013 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 #include "marking-thread.h" 29 30 #include "v8.h" 31 32 #include "isolate.h" 33 #include "v8threads.h" 34 35 namespace v8 { 36 namespace internal { 37 38 MarkingThread::MarkingThread(Isolate* isolate) 39 : Thread("MarkingThread"), 40 isolate_(isolate), 41 heap_(isolate->heap()), 42 start_marking_semaphore_(OS::CreateSemaphore(0)), 43 end_marking_semaphore_(OS::CreateSemaphore(0)), 44 stop_semaphore_(OS::CreateSemaphore(0)) { 45 NoBarrier_Store(&stop_thread_, static_cast<AtomicWord>(false)); 46 id_ = NoBarrier_AtomicIncrement(&id_counter_, 1); 47 } 48 49 50 Atomic32 MarkingThread::id_counter_ = -1; 51 52 53 void MarkingThread::Run() { 54 Isolate::SetIsolateThreadLocals(isolate_, NULL); 55 DisallowHeapAllocation no_allocation; 56 DisallowHandleAllocation no_handles; 57 DisallowHandleDereference no_deref; 58 59 while (true) { 60 start_marking_semaphore_->Wait(); 61 62 if (Acquire_Load(&stop_thread_)) { 63 stop_semaphore_->Signal(); 64 return; 65 } 66 67 end_marking_semaphore_->Signal(); 68 } 69 } 70 71 72 void MarkingThread::Stop() { 73 Release_Store(&stop_thread_, static_cast<AtomicWord>(true)); 74 start_marking_semaphore_->Signal(); 75 stop_semaphore_->Wait(); 76 Join(); 77 } 78 79 80 void MarkingThread::StartMarking() { 81 start_marking_semaphore_->Signal(); 82 } 83 84 85 void MarkingThread::WaitForMarkingThread() { 86 end_marking_semaphore_->Wait(); 87 } 88 89 } } // namespace v8::internal 90