| /* |
| * Copyright (C) 2017 Apple Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. 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. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. 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 "Scavenger.h" |
| |
| #include "Heap.h" |
| #include <thread> |
| |
| namespace bmalloc { |
| |
| Scavenger::Scavenger(std::lock_guard<StaticMutex>&) |
| { |
| #if BOS(DARWIN) |
| auto queue = dispatch_queue_create("WebKit Malloc Memory Pressure Handler", DISPATCH_QUEUE_SERIAL); |
| m_pressureHandlerDispatchSource = dispatch_source_create(DISPATCH_SOURCE_TYPE_MEMORYPRESSURE, 0, DISPATCH_MEMORYPRESSURE_CRITICAL, queue); |
| dispatch_source_set_event_handler(m_pressureHandlerDispatchSource, ^{ |
| scavenge(); |
| }); |
| dispatch_resume(m_pressureHandlerDispatchSource); |
| dispatch_release(queue); |
| #endif |
| } |
| |
| void Scavenger::scavenge() |
| { |
| std::lock_guard<StaticMutex> lock(Heap::mutex()); |
| for (unsigned i = numHeaps; i--;) |
| PerProcess<PerHeapKind<Heap>>::get()->at(i).scavenge(lock); |
| } |
| |
| } // namespace bmalloc |
| |
