void Heap::deallocateMediumLine(std::lock_guard<StaticMutex>& lock, MediumLine* line)
{
BASSERT(!line->refCount(lock));
MediumPage* page = MediumPage::get(line);
size_t refCount = page->refCount(lock);
page->deref(lock);
switch (refCount) {
case MediumPage::lineCount: {
// First free line in the page.
m_mediumPagesWithFreeLines[page->sizeClass()].push(page);
break;
}
case 1: {
// Last free line in the page.
m_mediumPages.push(page);
m_scavenger.run();
break;
}
}
}
MediumPage* Heap::allocateMediumPage(std::lock_guard<StaticMutex>& lock, size_t sizeClass)
{
Vector<MediumPage*>& mediumPagesWithFreeLines = m_mediumPagesWithFreeLines[sizeClass];
while (mediumPagesWithFreeLines.size()) {
MediumPage* page = mediumPagesWithFreeLines.pop();
if (!page->refCount(lock) || page->sizeClass() != sizeClass) // Page was promoted to the pages list.
continue;
return page;
}
MediumPage* page = [this, sizeClass]() {
if (m_mediumPages.size())
return m_mediumPages.pop();
m_isAllocatingPages = true;
return m_vmHeap.allocateMediumPage();
}();
page->setSizeClass(sizeClass);
return page;
}
