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      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