fead0d0600
Drop the previous Semaphore class from platform files. Add new Semaphore class using the new TimeDelta class for the WaitFor() operation. Consistently assert correct behaviour for the different implementations. Improve test coverage of the Semaphore class. R=mstarzinger@chromium.org Review URL: https://codereview.chromium.org/23748003 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16473 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
109 lines
3.9 KiB
C++
109 lines
3.9 KiB
C++
// Copyright 2012 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#include "sweeper-thread.h"
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#include "v8.h"
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#include "isolate.h"
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#include "v8threads.h"
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namespace v8 {
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namespace internal {
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static const int kSweeperThreadStackSize = 64 * KB;
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SweeperThread::SweeperThread(Isolate* isolate)
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: Thread(Thread::Options("v8:SweeperThread", kSweeperThreadStackSize)),
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isolate_(isolate),
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heap_(isolate->heap()),
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collector_(heap_->mark_compact_collector()),
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start_sweeping_semaphore_(0),
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end_sweeping_semaphore_(0),
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stop_semaphore_(0),
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free_list_old_data_space_(heap_->paged_space(OLD_DATA_SPACE)),
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free_list_old_pointer_space_(heap_->paged_space(OLD_POINTER_SPACE)),
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private_free_list_old_data_space_(heap_->paged_space(OLD_DATA_SPACE)),
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private_free_list_old_pointer_space_(
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heap_->paged_space(OLD_POINTER_SPACE)) {
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NoBarrier_Store(&stop_thread_, static_cast<AtomicWord>(false));
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}
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void SweeperThread::Run() {
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Isolate::SetIsolateThreadLocals(isolate_, NULL);
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DisallowHeapAllocation no_allocation;
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DisallowHandleAllocation no_handles;
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DisallowHandleDereference no_deref;
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while (true) {
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start_sweeping_semaphore_.Wait();
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if (Acquire_Load(&stop_thread_)) {
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stop_semaphore_.Signal();
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return;
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}
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collector_->SweepInParallel(heap_->old_data_space(),
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&private_free_list_old_data_space_,
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&free_list_old_data_space_);
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collector_->SweepInParallel(heap_->old_pointer_space(),
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&private_free_list_old_pointer_space_,
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&free_list_old_pointer_space_);
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end_sweeping_semaphore_.Signal();
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}
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}
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intptr_t SweeperThread::StealMemory(PagedSpace* space) {
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if (space->identity() == OLD_POINTER_SPACE) {
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return space->free_list()->Concatenate(&free_list_old_pointer_space_);
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} else if (space->identity() == OLD_DATA_SPACE) {
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return space->free_list()->Concatenate(&free_list_old_data_space_);
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}
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return 0;
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}
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void SweeperThread::Stop() {
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Release_Store(&stop_thread_, static_cast<AtomicWord>(true));
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start_sweeping_semaphore_.Signal();
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stop_semaphore_.Wait();
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Join();
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}
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void SweeperThread::StartSweeping() {
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start_sweeping_semaphore_.Signal();
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}
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void SweeperThread::WaitForSweeperThread() {
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end_sweeping_semaphore_.Wait();
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}
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} } // namespace v8::internal
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