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// Copyright 2012 the V8 project authors. 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.
#include "sweeper-thread.h"
#include "v8.h"
#include "isolate.h"
#include "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) {
ASSERT(!FLAG_job_based_sweeping);
NoBarrier_Store(&stop_thread_, static_cast<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 (Acquire_Load(&stop_thread_)) {
stop_semaphore_.Signal();
return;
}
collector_->SweepInParallel(heap_->old_data_space());
collector_->SweepInParallel(heap_->old_pointer_space());
end_sweeping_semaphore_.Signal();
}
}
void SweeperThread::Stop() {
Release_Store(&stop_thread_, static_cast<AtomicWord>(true));
start_sweeping_semaphore_.Signal();
stop_semaphore_.Wait();
Join();
}
void SweeperThread::StartSweeping() {
start_sweeping_semaphore_.Signal();
}
void SweeperThread::WaitForSweeperThread() {
end_sweeping_semaphore_.Wait();
}
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;
ASSERT(FLAG_parallel_sweeping);
return max_available;
}
} } // namespace v8::internal
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