Remove sweeper threads

src/heap/sweeper-thread.cc

-// Copyright 2012 the V8 project authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "src/heap/sweeper-thread.h"
-
-#include "src/v8.h"
-
-#include "src/isolate.h"
-#include "src/v8threads.h"
-
-namespace v8 {
-namespace internal {
-
-static const int kSweeperThreadStackSize = 64 * KB;
-
-SweeperThread::SweeperThread(Isolate* isolate)
-    : Thread(Thread::Options("v8:SweeperThread", kSweeperThreadStackSize)),
-      isolate_(isolate),
-      heap_(isolate->heap()),
-      collector_(heap_->mark_compact_collector()),
-      start_sweeping_semaphore_(0),
-      end_sweeping_semaphore_(0),
-      stop_semaphore_(0) {
-  DCHECK(!FLAG_job_based_sweeping);
-  base::NoBarrier_Store(&stop_thread_, static_cast<base::AtomicWord>(false));
-}
-
-
-void SweeperThread::Run() {
-  Isolate::SetIsolateThreadLocals(isolate_, NULL);
-  DisallowHeapAllocation no_allocation;
-  DisallowHandleAllocation no_handles;
-  DisallowHandleDereference no_deref;
-
-  while (true) {
-    start_sweeping_semaphore_.Wait();
-
-    if (base::Acquire_Load(&stop_thread_)) {
-      stop_semaphore_.Signal();
-      return;
-    }
-
-    collector_->SweepInParallel(heap_->old_data_space(), 0);
-    collector_->SweepInParallel(heap_->old_pointer_space(), 0);
-    end_sweeping_semaphore_.Signal();
-  }
-}
-
-
-void SweeperThread::Stop() {
-  base::Release_Store(&stop_thread_, static_cast<base::AtomicWord>(true));
-  start_sweeping_semaphore_.Signal();
-  stop_semaphore_.Wait();
-  Join();
-}
-
-
-void SweeperThread::StartSweeping() { start_sweeping_semaphore_.Signal(); }
-
-
-void SweeperThread::WaitForSweeperThread() { end_sweeping_semaphore_.Wait(); }
-
-
-bool SweeperThread::SweepingCompleted() {
-  bool value = end_sweeping_semaphore_.WaitFor(base::TimeDelta::FromSeconds(0));
-  if (value) {
-    end_sweeping_semaphore_.Signal();
-  }
-  return value;
-}
-
-
-int SweeperThread::NumberOfThreads(int max_available) {
-  if (!FLAG_concurrent_sweeping && !FLAG_parallel_sweeping) return 0;
-  if (FLAG_sweeper_threads > 0) return FLAG_sweeper_threads;
-  if (FLAG_concurrent_sweeping) return max_available - 1;
-  DCHECK(FLAG_parallel_sweeping);
-  return max_available;
-}
-}
-}  // namespace v8::internal